feat(sql): Support SQL sources

README.md

@@ -49,41 +49,58 @@ Check out all code demonstrations [HERE](demo/src/main/java/cc/carm/lib/configur
 For more examples, see the [Development Guide](.doc/README.md).
 
 ```java
-@HeaderComment("Configurations for sample")
+@ConfigPath(root = true)
-interface SampleConfig extends Configuration {
+@HeaderComments("Configurations for sample")
+public interface SampleConfig extends Configuration {
 
-    @InlineComment("Enabled?") // Inline comment
+  @InlineComment("Enabled?") // Inline comment
-    ConfiguredValue<Boolean> ENABLED = ConfiguredValue.of(true);
+  ConfiguredValue<Boolean> ENABLED = ConfiguredValue.of(true);
 
-    ConfiguredList<UUID> UUIDS = ConfiguredList.builderOf(UUID.class).fromString()
+  @HeaderComments("Server configurations") // Header comment
-            .parseValue(UUID::fromString).serializeValue(UUID::toString)
+  ConfiguredValue<Integer> PORT = ConfiguredValue.of(Integer.class);
-            .defaults(
-                    UUID.fromString("00000000-0000-0000-0000-000000000000"),
-                    UUID.fromString("00000000-0000-0000-0000-000000000001")
-            ).build();
 
-    interface INFO extends Configuration {
+  @HeaderComments({"[ UUID >-----------------------------------", "A lot of UUIDs"})
+  @FooterComments("[ UUID >-----------------------------------")
+  ConfiguredList<UUID> UUIDS = ConfiguredList.builderOf(UUID.class).fromString()
+          .parse(UUID::fromString).serialize(UUID::toString)
+          .defaults(
+                  UUID.fromString("00000000-0000-0000-0000-000000000000"),
+                  UUID.fromString("00000000-0000-0000-0000-000000000001")
+          ).build();
 
-        @HeaderComment("Configure your name!") // Header comment
+  @ConfigPath("info") // Custom path
-        ConfiguredValue<String> NAME = ConfiguredValue.of("Joker");
+  interface INFO extends Configuration {
 
-        @ConfigPath("year") // Custom path
+    @HeaderComments("Configure your name!") // Header comment
-        ConfiguredValue<Integer> AGE = ConfiguredValue.of(24);
+    ConfiguredValue<String> NAME = ConfiguredValue.of("Joker");
+
+    @ConfigPath("how-old-are-you") // Custom path
+    ConfiguredValue<Integer> AGE = ConfiguredValue.of(24);
+
+  }
 
-    }
 }
+
 ```
 
 ```java
 public class Sample {
   public static void main(String[] args) {
     // 1. Make a configuration provider from a file.
-    ConfigurationProvider<?> provider = EasyConfiguration.from("config.yml");
+    ConfigurationHolder<?> holder = YAMLConfigFactory.from("target/config.yml")
+            .resourcePath("configs/sample.yml")
+            .indent(4) // Optional: Set the indentation of the configuration file.
+            .build();
+
     // 2. Initialize the configuration classes or instances.
-    provider.initialize(SampleConfig.class);
+    holder.initialize(SampleConfig.class);
     // 3. Enjoy using the configuration!
+    System.out.println("Enabled? -> " + SampleConfig.ENABLED.resolve());
     SampleConfig.ENABLED.set(false);
-    System.out.println("Your name is " + SampleConfig.INFO.NAME.getNotNull() + " !");
+    System.out.println("And now? -> " + SampleConfig.ENABLED.resolve());
+    // p.s. Changes not save so enable value will still be true in the next run.
+
+    System.out.println("Your name is " + SampleConfig.INFO.NAME.resolve() + " (age=" + SampleConfig.INFO.AGE.resolve() + ")!");
   }
 }
 
@@ -92,16 +109,22 @@ public class Sample {
 ```yaml
 # Configurations for sample
 
-enabled: true # Enabled?
+enabled: true #Enabled?
 
+# Server configurations
+port:
+
+# [ UUID >-----------------------------------
+# A lot of UUIDs
 uuids:
   - 00000000-0000-0000-0000-000000000000
   - 00000000-0000-0000-0000-000000000001
+# [ UUID >-----------------------------------
 
 info:
   # Configure your name!
   name: Joker
-  year: 24
+  how-old-are-you: 24
 ```
 
 ### Dependencies
@@ -159,10 +182,10 @@ info:
             <scope>compile</scope>
         </dependency>
 
-        <!-- JSON file-based implementation, compatible with all Java environments. Note: JSON does not support file comments. -->
+        <!-- JSON file-based implementation, compatible with all Java environments. -->
         <dependency>
             <groupId>cc.carm.lib</groupId>
-            <artifactId>easyconfiguration-json</artifactId>
+            <artifactId>easyconfiguration-gson</artifactId>
             <version>[LATEST RELEASE]</version>
             <scope>compile</scope>
         </dependency>
@@ -205,8 +228,8 @@ dependencies {
     // YAML file-based implementation, compatible with all Java environments.
     api "cc.carm.lib:easyconfiguration-yaml:[LATEST RELEASE]"
 
-    // JSON file-based implementation, compatible with all Java environments. Note: JSON does not support file comments.
+    // JSON file-based implementation, compatible with all Java environments.
-    api "cc.carm.lib:easyconfiguration-json:[LATEST RELEASE]"
+    api "cc.carm.lib:easyconfiguration-gson:[LATEST RELEASE]"
 
 }
 ```
@@ -220,7 +243,8 @@ dependencies {
 EasyConfiguration for MineCraft!
 Easily manage configurations on MineCraft-related server platforms.
 
-Currently supports BungeeCord, Bukkit (Spigot) servers, with more platforms to be supported soon.
+Currently, it supports BungeeCord, Velocity, Bukkit (Spigot) servers, 
+with more platforms to be supported soon.
 
 ## Support and Donation
 
@@ -232,6 +256,11 @@ Many thanks to Jetbrains for kindly providing a license for us to work on this a
 
 [![](https://resources.jetbrains.com/storage/products/company/brand/logos/jb_beam.svg)](https://www.jetbrains.com/?from=https://github.com/CarmJos/EasyConfiguration)
 
+Many thanks to [ArtformGames](https://github.com/ArtformGames) for their 
+strong support and active contribution to this project!
+
+<img src="https://raw.githubusercontent.com/ArtformGames/.github/master/logo/logo_full.svg" width="317px" height="117px" alt="ArtformGames">
+
 ## Open Source License
 
 This project's source code is licensed under

README_CN.md

@@ -32,26 +32,35 @@ README LANGUAGES [ [English](README.md) | [**中文**](README_CN.md)  ]
 
 ## 开发
 
-详细开发介绍请 [点击这里](.doc/README.md) , JavaDoc(最新Release) 请 [点击这里](https://CarmJos.github.io/EasyConfiguration) 。
+详细开发介绍请 [点击这里](.doc/README.md) , JavaDoc(最新Release)
+请 [点击这里](https://CarmJos.github.io/EasyConfiguration) 。
 
 ### 示例代码
 
 为快速的展示该项目的适用性，这里有几个实际演示：
+
 - [数据库配置文件实例](demo/src/main/java/cc/carm/lib/configuration/demo/DatabaseConfiguration.java)
 - [全种类配置实例类演示](demo/src/main/java/cc/carm/lib/configuration/demo/tests/conf/DemoConfiguration.java)
 
-您可以 [点击这里](demo/src/main/java/cc/carm/lib/configuration/demo) 直接查看现有的代码演示，更多复杂情况演示详见 [开发介绍](.doc/README.md) 。
+您可以 [点击这里](demo/src/main/java/cc/carm/lib/configuration/demo)
-
+直接查看现有的代码演示，更多复杂情况演示详见 [开发介绍](.doc/README.md) 。
 
 ```java
-@HeaderComment("Configurations for sample")
-interface SampleConfig extends Configuration {
 
-    @InlineComment("Enabled?") // 行内注释
+@ConfigPath(root = true)
+@HeaderComments("Configurations for sample")
+public interface SampleConfig extends Configuration {
+
+    @InlineComment("Enabled?") // 行后注释
     ConfiguredValue<Boolean> ENABLED = ConfiguredValue.of(true);
 
+    @HeaderComments("Server configurations") // 头部注释
+    ConfiguredValue<Integer> PORT = ConfiguredValue.of(Integer.class);
+
+    @HeaderComments({"[ UUID >-----------------------------------", "A lot of UUIDs"})
+    @FooterComments("[ UUID >-----------------------------------")
     ConfiguredList<UUID> UUIDS = ConfiguredList.builderOf(UUID.class).fromString()
-            .parseValue(UUID::fromString).serializeValue(UUID::toString)
+            .parse(UUID::fromString).serialize(UUID::toString)
             .defaults(
                     UUID.fromString("00000000-0000-0000-0000-000000000000"),
                     UUID.fromString("00000000-0000-0000-0000-000000000001")
@@ -59,26 +68,34 @@ interface SampleConfig extends Configuration {
 
     interface INFO extends Configuration {
 
-        @HeaderComment("Configure your name!") // 头部注释
+        @HeaderComments("Configure your name!") // Header comment
         ConfiguredValue<String> NAME = ConfiguredValue.of("Joker");
 
-        @ConfigPath("year") // 自定义配置路径，若不定义，则按照默认规则生成
+        @ConfigPath("how-old-are-you") // 自定义路径
         ConfiguredValue<Integer> AGE = ConfiguredValue.of(24);
 
     }
+
 }
+
 ```
 
 ```java
 public class Sample {
     public static void main(String[] args) {
-        // 1. 生成一个 “Provider” 用于给配置类提供源配置的文件。
+        // 1. 生成一个 “holder” 用于给配置类提供源配置的文件。
-        ConfigurationProvider<?> provider = EasyConfiguration.from("config.yml");
+        ConfigurationHolder<?> holder = YAMLConfigFactory.from("target/config.yml")
-        // 2. 通过 “Provider” 初始化配置类或配置实例。
+                .resourcePath("configs/sample.yml")
-        provider.initialize(SampleConfig.class);
+                .indent(4) // Optional: Set the indentation of the configuration file.
+                .build();
+
+        // 2. 通过 “holder” 初始化配置类或配置实例。
+        holder.initialize(SampleConfig.class);
         // 3. 现在可以享受快捷方便的配置文件使用方式了~
+        System.out.println("Enabled? -> " + SampleConfig.ENABLED.resolve());
         SampleConfig.ENABLED.set(false);
-        System.out.println("Your name is " + SampleConfig.INFO.NAME.getNotNull() + " !");
+        System.out.println("And now? -> " + SampleConfig.ENABLED.resolve());
+        // p.s. 在本示例里的更改未保存，因此启用值在下次运行中仍将为 true。
     }
 }
 ```
@@ -86,16 +103,22 @@ public class Sample {
 ```yaml
 # Configurations for sample
 
-enabled: true # Enabled?
+enabled: true #Enabled?
 
+# Server configurations
+port:
+
+# [ UUID >-----------------------------------
+# A lot of UUIDs
 uuids:
   - 00000000-0000-0000-0000-000000000000
   - 00000000-0000-0000-0000-000000000001
+# [ UUID >-----------------------------------
 
 info:
   # Configure your name!
   name: Joker
-  year: 24
+  how-old-are-you: 24
 ```
 
 ### 依赖方式
@@ -164,7 +187,7 @@ info:
         <!--需要注意的是，JSON不支持文件注释。-->
         <dependency>
             <groupId>cc.carm.lib</groupId>
-            <artifactId>easyconfiguration-json</artifactId>
+            <artifactId>easyconfiguration-gson</artifactId>
             <version>[LATEST RELEASE]</version>
             <scope>compile</scope>
         </dependency>
@@ -223,9 +246,9 @@ dependencies {
     //基于YAML文件的实现版本，可用于全部Java环境。
     api "cc.carm.lib:easyconfiguration-yaml:[LATEST RELEASE]"
 
-     //基于JSON文件的实现版本，可用于全部Java环境。
+    //基于JSON文件的实现版本，可用于全部Java环境。
     //需要注意的是，JSON不支持文件注释。
-    api "cc.carm.lib:easyconfiguration-json:[LATEST RELEASE]"
+    api "cc.carm.lib:easyconfiguration-gson:[LATEST RELEASE]"
 
     api "cc.carm.lib:easyconfiguration-hocon:[LATEST RELEASE]"
 
@@ -255,6 +278,10 @@ EasyConfiguration for MineCraft!
 
 [![](https://resources.jetbrains.com/storage/products/company/brand/logos/jb_beam.svg)](https://www.jetbrains.com/?from=https://github.com/CarmJos/EasyConfiguration)
 
+万分感谢来自 [ArtformGames](https://github.com/ArtformGames) 对本项目的大力支持与积极贡献！
+
+<img src="https://raw.githubusercontent.com/ArtformGames/.github/master/logo/logo_full.svg" width="317px" height="117px" alt="ArtformGames">
+
 ## 开源协议
 
 本项目源码采用 [GNU LESSER GENERAL PUBLIC LICENSE](https://www.gnu.org/licenses/lgpl-3.0.html) 开源协议。

core/pom.xml

@@ -5,7 +5,7 @@
     <parent>
         <artifactId>easyconfiguration-parent</artifactId>
         <groupId>cc.carm.lib</groupId>
-        <version>4.0.1</version>
+        <version>4.0.8</version>
     </parent>
     <modelVersion>4.0.0</modelVersion>
     <properties>

core/src/main/java/cc/carm/lib/configuration/adapter/ValueType.java

@@ -4,6 +4,7 @@ import org.jetbrains.annotations.NotNull;
 
 import java.lang.reflect.ParameterizedType;
 import java.lang.reflect.Type;
+import java.util.List;
 import java.util.Map;
 import java.util.Objects;
 
@@ -157,7 +158,7 @@ public abstract class ValueType<T> {
             ParameterizedType pt = (ParameterizedType) type;
             Type raw = pt.getRawType();
             StringBuilder sb = new StringBuilder();
-            sb.append(raw.getTypeName());
+            sb.append(raw.getClass().getName());
             sb.append('<');
             Type[] args = pt.getActualTypeArguments();
             for (int i = 0; i < args.length; i++) {
@@ -166,6 +167,7 @@ public abstract class ValueType<T> {
                 }
                 sb.append(args[i].getTypeName());
             }
+            sb.append('>');
             return sb.toString();
         }
         return type.getTypeName();

core/src/main/java/cc/carm/lib/configuration/source/ConfigurationFactory.java

@@ -20,6 +20,13 @@ import java.util.function.Consumer;
 import java.util.function.Function;
 import java.util.function.Supplier;
 
+/**
+ * ConfigurationFactory, used to create configuration holder.
+ *
+ * @param <SOURCE> The {@link ConfigureSource} type
+ * @param <HOLDER> The {@link ConfigurationHolder} type.
+ * @param <SELF>   Self builder, for further implement support.
+ */
 public abstract class ConfigurationFactory<
         SOURCE extends ConfigureSource<?, ?, SOURCE>,
         HOLDER extends ConfigurationHolder<SOURCE>,
@@ -139,18 +146,39 @@ public abstract class ConfigurationFactory<
         return self();
     }
 
+    /**
+     * Supply the base path generator for this configuration holder
+     *
+     * @param generator {@link  PathGenerator}
+     * @return this
+     */
     public SELF pathGenerator(PathGenerator generator) {
         return initializer(loader -> {
             loader.pathGenerator(generator);
         });
     }
 
+    /**
+     * Register a new annotation for metadata to the configuration loader
+     *
+     * @param annotation The {@link Annotation}
+     * @param metadata   The {@link ConfigurationMetadata} type
+     * @param extractor  The {@link Function} to extract the metadata from the annotation
+     * @param <M>        The metadata type
+     * @param <A>        The annotation type
+     * @return this
+     */
     public <M, A extends Annotation> SELF metaAnnotation(@NotNull Class<A> annotation,
                                                          @NotNull ConfigurationMetadata<M> metadata,
                                                          @NotNull Function<A, M> extractor) {
         return initializer(loader -> loader.registerAnnotation(annotation, metadata, extractor));
     }
 
+    /**
+     * Build the configuration holder.
+     *
+     * @return The configuration holder
+     */
     public abstract @NotNull HOLDER build();
 
 }

core/src/main/java/cc/carm/lib/configuration/source/ConfigurationHolder.java

@@ -6,8 +6,11 @@ import cc.carm.lib.configuration.adapter.ValueType;
 import cc.carm.lib.configuration.source.loader.ConfigurationInitializer;
 import cc.carm.lib.configuration.source.meta.ConfigurationMetaHolder;
 import cc.carm.lib.configuration.source.meta.ConfigurationMetadata;
+import cc.carm.lib.configuration.source.meta.StandardMeta;
+import cc.carm.lib.configuration.source.option.ConfigurationOption;
 import cc.carm.lib.configuration.source.option.ConfigurationOptionHolder;
 import cc.carm.lib.configuration.source.section.ConfigureSource;
+import cc.carm.lib.configuration.value.ConfigValue;
 import cc.carm.lib.configuration.value.ValueManifest;
 import org.jetbrains.annotations.Contract;
 import org.jetbrains.annotations.NotNull;
@@ -17,6 +20,8 @@ import org.jetbrains.annotations.UnmodifiableView;
 import java.util.Collections;
 import java.util.LinkedHashMap;
 import java.util.Map;
+import java.util.Objects;
+import java.util.function.Predicate;
 
 public abstract class ConfigurationHolder<SOURCE extends ConfigureSource<?, ?, SOURCE>> {
 
@@ -50,6 +55,10 @@ public abstract class ConfigurationHolder<SOURCE extends ConfigureSource<?, ?, S
         return options;
     }
 
+    public <O> @NotNull O option(@NotNull ConfigurationOption<O> option) {
+        return options().get(option);
+    }
+
     public @NotNull Map<String, ConfigurationMetaHolder> metadata() {
         return this.metadata;
     }
@@ -61,14 +70,26 @@ public abstract class ConfigurationHolder<SOURCE extends ConfigureSource<?, ?, S
     @NotNull
     @UnmodifiableView
     public <M> Map<String, M> extractMetadata(@NotNull ConfigurationMetadata<M> type) {
+        return extractMetadata(type, Objects::nonNull);
+    }
+
+    @NotNull
+    @UnmodifiableView
+    public <M> Map<String, M> extractMetadata(@NotNull ConfigurationMetadata<M> type, @NotNull Predicate<M> filter) {
         Map<String, M> metas = new LinkedHashMap<>();
         for (Map.Entry<String, ConfigurationMetaHolder> entry : this.metadata.entrySet()) {
             M data = entry.getValue().get(type);
-            if (data != null) metas.put(entry.getKey(), data);
+            if (filter.test(data)) metas.put(entry.getKey(), data);
         }
         return Collections.unmodifiableMap(metas);
     }
 
+    @NotNull
+    @UnmodifiableView
+    public Map<String, ConfigValue<?>> registeredValues() {
+        return extractMetadata(StandardMeta.VALUE);
+    }
+
     public ValueAdapterRegistry adapters() {
         return this.adapters;
     }

core/src/main/java/cc/carm/lib/configuration/source/loader/ConfigInitializeHandler.java

@@ -5,26 +5,27 @@ import org.jetbrains.annotations.NotNull;
 import org.jetbrains.annotations.Nullable;
 
 @FunctionalInterface
-public interface ConfigInitializeHandler<T> {
+public interface ConfigInitializeHandler<T, V> {
 
-    static <T> ConfigInitializeHandler<T> start() {
+    static <T, V> ConfigInitializeHandler<T, V> start() {
-        return (provider, path, value) -> {
+        return (provider, path, value, instace) -> {
         };
     }
 
-    void whenInitialize(@NotNull ConfigurationHolder<?> holder, @Nullable String path, @NotNull T value) throws Exception;
+    void whenInitialize(@NotNull ConfigurationHolder<?> holder, @Nullable String path,
+                        @NotNull T value, @Nullable V instance) throws Exception;
 
-    default ConfigInitializeHandler<T> andThen(ConfigInitializeHandler<T> after) {
+    default ConfigInitializeHandler<T, V> andThen(ConfigInitializeHandler<T, V> after) {
-        return (provider, path, value) -> {
+        return (provider, path, value, instance) -> {
-            whenInitialize(provider, path, value);
+            whenInitialize(provider, path, value, instance);
-            after.whenInitialize(provider, path, value);
+            after.whenInitialize(provider, path, value, instance);
         };
     }
 
-    default ConfigInitializeHandler<T> compose(ConfigInitializeHandler<T> before) {
+    default ConfigInitializeHandler<T, V> compose(ConfigInitializeHandler<T, V> before) {
-        return (provider, path, value) -> {
+        return (provider, path, value, instance) -> {
-            before.whenInitialize(provider, path, value);
+            before.whenInitialize(provider, path, value, instance);
-            whenInitialize(provider, path, value);
+            whenInitialize(provider, path, value, instance);
         };
     }
 

core/src/main/java/cc/carm/lib/configuration/source/loader/ConfigurationInitializer.java

@@ -21,18 +21,18 @@ import java.util.function.Function;
 public class ConfigurationInitializer {
 
     protected @NotNull PathGenerator pathGenerator;
-    protected @NotNull ConfigInitializeHandler<Field> fieldInitializer;
+    protected @NotNull ConfigInitializeHandler<Field, ConfigValue<?>> valueInitializer;
-    protected @NotNull ConfigInitializeHandler<Class<? extends Configuration>> classInitializer;
+    protected @NotNull ConfigInitializeHandler<Class<? extends Configuration>, Object> classInitializer;
 
     public ConfigurationInitializer() {
         this(PathGenerator.of(), ConfigInitializeHandler.start(), ConfigInitializeHandler.start());
     }
 
     public ConfigurationInitializer(@NotNull PathGenerator pathGenerator,
-                                    @NotNull ConfigInitializeHandler<Field> fieldInitializer,
+                                    @NotNull ConfigInitializeHandler<Field, ConfigValue<?>> valueInitializer,
-                                    @NotNull ConfigInitializeHandler<Class<? extends Configuration>> classInitializer) {
+                                    @NotNull ConfigInitializeHandler<Class<? extends Configuration>, Object> classInitializer) {
         this.pathGenerator = pathGenerator;
-        this.fieldInitializer = fieldInitializer;
+        this.valueInitializer = valueInitializer;
         this.classInitializer = classInitializer;
     }
 
@@ -44,34 +44,34 @@ public class ConfigurationInitializer {
         return pathGenerator;
     }
 
-    public ConfigInitializeHandler<Field> fieldInitializer() {
+    public ConfigInitializeHandler<Field, ConfigValue<?>> fieldInitializer() {
-        return fieldInitializer;
+        return valueInitializer;
     }
 
-    public void fieldInitializer(@NotNull ConfigInitializeHandler<Field> fieldInitializer) {
+    public void fieldInitializer(@NotNull ConfigInitializeHandler<Field, ConfigValue<?>> fieldInitializer) {
-        this.fieldInitializer = fieldInitializer;
+        this.valueInitializer = fieldInitializer;
     }
 
-    public ConfigInitializeHandler<Class<? extends Configuration>> classInitializer() {
+    public ConfigInitializeHandler<Class<? extends Configuration>, Object> classInitializer() {
         return classInitializer;
     }
 
-    public void classInitializer(@NotNull ConfigInitializeHandler<Class<? extends Configuration>> classInitializer) {
+    public void classInitializer(@NotNull ConfigInitializeHandler<Class<? extends Configuration>, Object> classInitializer) {
         this.classInitializer = classInitializer;
     }
 
-    public void appendFieldInitializer(@NotNull ConfigInitializeHandler<Field> fieldInitializer) {
+    public void appendFieldInitializer(@NotNull ConfigInitializeHandler<Field, ConfigValue<?>> fieldInitializer) {
-        this.fieldInitializer = this.fieldInitializer.andThen(fieldInitializer);
+        this.valueInitializer = this.valueInitializer.andThen(fieldInitializer);
     }
 
-    public void appendClassInitializer(@NotNull ConfigInitializeHandler<Class<? extends Configuration>> classInitializer) {
+    public void appendClassInitializer(@NotNull ConfigInitializeHandler<Class<? extends Configuration>, Object> classInitializer) {
         this.classInitializer = this.classInitializer.andThen(classInitializer);
     }
 
     public <T, A extends Annotation> void registerClassAnnotation(@NotNull Class<A> annotation,
                                                                   @NotNull ConfigurationMetadata<T> metadata,
                                                                   @NotNull Function<A, T> extractor) {
-        appendClassInitializer((holder, path, clazz) -> {
+        appendClassInitializer((holder, path, clazz, instance) -> {
             A data = clazz.getAnnotation(annotation);
             if (data == null) return;
             holder.metadata(path).setIfAbsent(metadata, extractor.apply(data));
@@ -81,7 +81,7 @@ public class ConfigurationInitializer {
     public <T, A extends Annotation> void registerFieldAnnotation(@NotNull Class<A> annotation,
                                                                   @NotNull ConfigurationMetadata<T> metadata,
                                                                   @NotNull Function<A, T> extractor) {
-        appendFieldInitializer((holder, path, field) -> {
+        appendFieldInitializer((holder, path, field, instance) -> {
             A data = field.getAnnotation(annotation);
             if (data == null) return;
             holder.metadata(path).setIfAbsent(metadata, extractor.apply(data));
@@ -108,13 +108,13 @@ public class ConfigurationInitializer {
     public void initialize(@NotNull ConfigurationHolder<?> holder,
                            @NotNull Configuration config) throws Exception {
         initializeInstance(holder, config, null, null);
-        if (holder.options().get(StandardOptions.SET_DEFAULTS)) holder.save();
+        if (holder.option(StandardOptions.SET_DEFAULTS)) holder.save();
     }
 
     public void initialize(@NotNull ConfigurationHolder<?> holder,
                            @NotNull Class<? extends Configuration> clazz) throws Exception {
         initializeStaticClass(holder, clazz, null, null);
-        if (holder.options().get(StandardOptions.SET_DEFAULTS)) holder.save();
+        if (holder.option(StandardOptions.SET_DEFAULTS)) holder.save();
     }
 
 
@@ -123,7 +123,7 @@ public class ConfigurationInitializer {
                                       @Nullable String parentPath, @Nullable Field configField) {
         String path = getClassPath(holder, parentPath, root.getClass(), configField);
         try {
-            this.classInitializer.whenInitialize(holder, path, root.getClass());
+            this.classInitializer.whenInitialize(holder, path, root.getClass(), root);
         } catch (Exception e) {
             e.printStackTrace();
         }
@@ -140,7 +140,7 @@ public class ConfigurationInitializer {
         String path = getClassPath(holder, parentPath, clazz, configField);
 
         try {
-            this.classInitializer.whenInitialize(holder, path, (Class<? extends Configuration>) clazz);
+            this.classInitializer.whenInitialize(holder, path, (Class<? extends Configuration>) clazz, configField);
         } catch (Exception e) {
             e.printStackTrace();
         }
@@ -149,7 +149,7 @@ public class ConfigurationInitializer {
             initializeField(holder, clazz, field, path);
         }
 
-        if (holder.options().get(StandardOptions.LOAD_SUB_CLASSES)) {
+        if (holder.option(StandardOptions.LOAD_SUB_CLASSES)) {
             Class<?>[] classes = clazz.getDeclaredClasses();
             for (int i = classes.length - 1; i >= 0; i--) {   // 逆向加载，保持顺序。
                 initializeStaticClass(holder, classes[i], path, null);
@@ -169,14 +169,17 @@ public class ConfigurationInitializer {
                 String path = getFieldPath(holder, parent, field);
                 if (path == null) return;
                 value.initialize(holder, path);
-                holder.metadata(path).set(StandardMeta.UNIT, true); // Mark the minimal config value unit.
+                holder.metadata(path).set(StandardMeta.VALUE, value); // Mark the minimal config value unit.
+                if (holder.option(StandardOptions.SET_DEFAULTS)) {
+                    value.setDefault(); // Set default value.
+                }
                 try {
-                    this.fieldInitializer.whenInitialize(holder, path, field);
+                    this.valueInitializer.whenInitialize(holder, path, field, value);
                 } catch (Exception e) {
                     e.printStackTrace();
                 }
-                if (holder.options().get(StandardOptions.SET_DEFAULTS)) {
+                if (holder.option(StandardOptions.PRELOAD)) {
-                    value.setDefault();
+                    value.get(); // Preload the value by calling #get method.
                 }
             } else if (source instanceof Configuration && object instanceof Configuration) {
                 // 当且仅当 源字段与字段 均为Configuration实例时，才对目标字段进行下一步初始化加载。

core/src/main/java/cc/carm/lib/configuration/source/loader/PathGenerator.java

@@ -9,6 +9,12 @@ import org.jetbrains.annotations.Nullable;
 import java.lang.reflect.Field;
 import java.util.function.UnaryOperator;
 
+/**
+ * Path generator for configuration.
+ * <p>
+ * Path generator is a utility class that helps to generate the path of the configuration.
+ * It can be used to generate the path of the field or class.
+ */
 public class PathGenerator {
 
     public static PathGenerator of() {
@@ -80,7 +86,7 @@ public class PathGenerator {
     }
 
     public static char pathSeparator(ConfigurationHolder<?> holder) {
-        return holder.options().get(StandardOptions.PATH_SEPARATOR);
+        return holder.option(StandardOptions.PATH_SEPARATOR);
     }
 
     /**

core/src/main/java/cc/carm/lib/configuration/source/meta/StandardMeta.java

@@ -1,10 +1,12 @@
 package cc.carm.lib.configuration.source.meta;
 
+import cc.carm.lib.configuration.value.ConfigValue;
+
 public interface StandardMeta {
 
     /**
-     * To mark the {@link cc.carm.lib.configuration.value.ConfigValue} as a minimal unit path.
+     * To mark the {@link ConfigValue} instance of specific path.
      */
-    ConfigurationMetadata<Boolean> UNIT = ConfigurationMetadata.of(false);
+    ConfigurationMetadata<ConfigValue<?>> VALUE = ConfigurationMetadata.of();
 
 }

core/src/main/java/cc/carm/lib/configuration/source/option/ConfigurationOption.java

@@ -6,32 +6,20 @@ import java.util.function.Supplier;
 
 public class ConfigurationOption<V> {
 
-    @SuppressWarnings("unchecked")
     public static <T> ConfigurationOption<T> of(@NotNull T defaultValue) {
-        return of((Class<T>) defaultValue.getClass(), defaultValue);
+        return new ConfigurationOption<>(defaultValue);
-    }
-
-    public static <T> ConfigurationOption<T> of(@NotNull Class<T> valueClazz, @NotNull T defaultValue) {
-        return new ConfigurationOption<>(valueClazz, defaultValue);
     }
 
     public static <T> ConfigurationOption<T> of(@NotNull Supplier<T> defaultValue) {
         return of(defaultValue.get());
     }
 
-    private final @NotNull Class<V> valueClazz;
     private @NotNull V defaultValue;
 
-    public ConfigurationOption(@NotNull Class<V> valueClazz, @NotNull V defaultValue) {
+    public ConfigurationOption(@NotNull V defaultValue) {
-        this.valueClazz = valueClazz;
         this.defaultValue = defaultValue;
     }
 
-    @NotNull
-    public Class<V> valueClass() {
-        return this.valueClazz;
-    }
-
     public @NotNull V defaults() {
         return defaultValue;
     }

core/src/main/java/cc/carm/lib/configuration/source/option/StandardOptions.java

@@ -23,12 +23,13 @@ public interface StandardOptions {
     ConfigurationOption<Boolean> LOAD_SUB_CLASSES = of(true);
 
     /**
-     * Whether to pre parse the config values.
+     * Whether to pre parse the config values,
-     * <br> if false, the values will be parsed when calling
+     * may good to set true if you want to keep the config format.
-     * {@link cc.carm.lib.configuration.value.ConfigValue#get()}
      * <br> if true, the values will be parsed when
      * {@link ConfigurationHolder#initialize(Configuration)}.
+     * <br> if false, the values will be parsed when calling
+     * {@link cc.carm.lib.configuration.value.ConfigValue#get()}
      */
-    ConfigurationOption<Boolean> PRELOAD = of(false);
+    ConfigurationOption<Boolean> PRELOAD = of(true);
 
 }

core/src/main/java/cc/carm/lib/configuration/source/section/ConfigureSection.java

@@ -1,73 +1,441 @@
 package cc.carm.lib.configuration.source.section;
 
 import cc.carm.lib.configuration.function.DataFunction;
-import cc.carm.lib.configuration.source.option.StandardOptions;
 import org.jetbrains.annotations.Contract;
 import org.jetbrains.annotations.NotNull;
 import org.jetbrains.annotations.Nullable;
 import org.jetbrains.annotations.UnmodifiableView;
 
 import java.util.*;
+import java.util.function.BiConsumer;
+import java.util.function.Consumer;
 import java.util.function.Function;
 import java.util.function.Supplier;
 import java.util.stream.Stream;
 
+/**
+ * Represents a section of a configuration.
+ *
+ * @author Carm
+ * @since 4.0.0
+ */
 public interface ConfigureSection {
 
-    @NotNull ConfigureSource<?, ?, ?> source();
+    /**
-
+     * Gets the parent section of this section.
+     * <p>
+     * For root sections, this will return null.
+     *
+     * @return Parent section, or null if this is a root section.
+     */
+    @Contract(pure = true)
     @Nullable ConfigureSection parent();
 
-    default char separator() {
+    /**
-        return source().holder().options().get(StandardOptions.PATH_SEPARATOR);
+     * Get the current section's path from {@link #parent()} of this section.
+     *
+     * @return The current path of this section, if {@link #isRoot()}, return empty string.
+     */
+    @NotNull String path();
+
+    /**
+     * Get the full path of this section.
+     *
+     * @return The full path of this section, if {@link #isRoot()}, return empty string.
+     */
+    default @NotNull String fullPath() {
+        if (parent() == null) return "";
+        return (parent().isRoot() ? "" : parent().fullPath() + pathSeparator()) + path();
     }
 
+
+    /**
+     * Get the path separator for the section.
+     *
+     * @return The path separator
+     */
+    default char pathSeparator() {
+        return '.';
+    }
+
+    /**
+     * Gets if this section is a root section.
+     *
+     * @return True if this section is a root section, false otherwise.
+     */
+    @Contract(pure = true)
+    default boolean isRoot() {
+        return parent() == null;
+    }
+
+    /**
+     * Gets if this section is empty.
+     *
+     * @return True if this section is empty, false otherwise.
+     */
+    default boolean isEmpty() {
+        return getValues(false).isEmpty();
+    }
+
+    /**
+     * Gets the number of keys in this section.
+     *
+     * @return Number of keys in this section.
+     */
+    default int size(boolean deep) {
+        return getKeys(deep).size();
+    }
+
+    /**
+     * Gets a set containing all keys in this section.
+     * <p>
+     * If deep is set to true, then this will contain all the keys within any
+     * child {@link ConfigureSection}s (and their children paths).
+     * <p>
+     * If deep is set to false, then this will contain only the keys of any
+     * direct children, and not their own children.
+     *
+     * @param deep Whether to get a deep list.
+     * @return Set of keys contained within this Section.
+     */
     @NotNull
     @UnmodifiableView
     default Set<String> getKeys(boolean deep) {
         return getValues(deep).keySet();
     }
 
+    /**
+     * Gets a set containing all primary keys in this section.
+     *
+     * @return Set of keys contained within this Section.
+     */
+    @NotNull
+    @UnmodifiableView
+    default Set<String> keys() {
+        return getKeys(false);
+    }
+
+    /**
+     * Gets a set containing all values in this section.
+     * <p>
+     * If deep is set to true, then this will contain all the keys within any
+     * child {@link ConfigureSection}s (and their children paths).
+     * <p>
+     * If deep is set to false, then this will contain only the keys of any
+     * direct children, and not their own children.
+     *
+     * @param deep Whether to get a deep list.
+     * @return Map of data values contained within this Section.
+     */
     @NotNull
     @UnmodifiableView
     Map<String, Object> getValues(boolean deep);
 
+    /**
+     * Gets a set containing all key-values in this section.
+     *
+     * @return Map of data values contained within this Section.
+     * @see #getValues(boolean)
+     */
+    @NotNull
+    @UnmodifiableView
+    default Map<String, Object> values() {
+        return getValues(false);
+    }
+
+    /**
+     * Create a stream of all values in this section.
+     *
+     * @return Stream of all values in this section.
+     */
+    default Stream<Map.Entry<String, Object>> stream() {
+        return values().entrySet().stream();
+    }
+
+    /**
+     * Iterates over all keys in this section.
+     *
+     * @param action The action to apply to each key.
+     */
+    default void forEach(@NotNull BiConsumer<String, Object> action) {
+        values().forEach(action);
+    }
+
+    /**
+     * Sets the value at the given path.
+     * <p>
+     * Null values will be kept, if you want to remove a value use {@link #remove(String)}
+     * Path separator depends on holder's
+     * {@link cc.carm.lib.configuration.source.option.StandardOptions#PATH_SEPARATOR}
+     *
+     * @param path  The path to set the value at.
+     * @param value The value to set.
+     */
     void set(@NotNull String path, @Nullable Object value);
 
-    boolean contains(@NotNull String path);
+    /**
+     * Removes the value at the given path.
+     * <p>
+     * Path separator depends on holder's
+     * {@link cc.carm.lib.configuration.source.option.StandardOptions#PATH_SEPARATOR}
+     *
+     * @param path The path to remove the value at.
+     */
+    void remove(@NotNull String path);
 
+    /**
+     * Check if the given path is present.
+     * <p>
+     * Path separator depends on holder's
+     * {@link cc.carm.lib.configuration.source.option.StandardOptions#PATH_SEPARATOR}
+     *
+     * @param path The path to check.
+     * @return True if the value is present, false otherwise.
+     */
+    default boolean contains(@NotNull String path) {
+        return getKeys(true).contains(path);
+    }
+
+    /**
+     * Check if the value of given path is present.
+     * <p>
+     * Path separator depends on holder's
+     * {@link cc.carm.lib.configuration.source.option.StandardOptions#PATH_SEPARATOR}
+     *
+     * @param path The path to check.
+     * @return True if the value is present, false otherwise.
+     */
+    default boolean containsValue(@NotNull String path) {
+        return get(path) != null;
+    }
+
+    /**
+     * Predicate the value of given path is specific type.
+     *
+     * @param path      The path to check.
+     * @param typeClass The type's class
+     * @param <T>       The type to check.
+     * @return True if the value is present and is the correct type, false otherwise.
+     */
     default <T> boolean isType(@NotNull String path, @NotNull Class<T> typeClass) {
         return typeClass.isInstance(get(path));
     }
 
+    /**
+     * Predicate the value of given path is a  {@link List}.
+     *
+     * @param path The path to check.
+     * @return True if the value is present and is a list, false otherwise.
+     */
     default boolean isList(@NotNull String path) {
         return isType(path, List.class);
     }
 
-    @Nullable List<?> getList(@NotNull String path);
+    /**
+     * Get the value as a {@link List} from the specified path.
+     *
+     * @param path The path to get the  {@link List}.
+     * @return The list if the path exists and is a list, otherwise null.
+     */
+    default @Nullable List<?> getList(@NotNull String path) {
+        Object val = get(path);
+        return (val instanceof List<?>) ? (List<?>) val : null;
+    }
 
+    /**
+     * Predicate the value of given path is a {@link ConfigureSection}.
+     *
+     * @param path The path to check.
+     * @return True if the value is present and is a section, false otherwise.
+     */
     default boolean isSection(@NotNull String path) {
         return isType(path, ConfigureSection.class);
     }
 
+    /**
+     * Get the value as a {@link ConfigureSection} from the specified path.
+     *
+     * @param path The path to get the section.
+     * @return The section if the path exists and is a section, otherwise null.
+     */
     @Nullable
-    ConfigureSection getSection(@NotNull String path);
+    default ConfigureSection getSection(@NotNull String path) {
-
+        Object val = get(path);
-    @Nullable Object get(@NotNull String path);
+        return (val instanceof ConfigureSection) ? (ConfigureSection) val : null;
-
-    default @Nullable <T> T get(@NotNull String path, @NotNull Class<T> clazz) {
-        return get(path, null, clazz);
     }
 
-    default @Nullable <T> T get(@NotNull String path, @NotNull DataFunction<Object, T> parser) {
+    /**
+     * Creates a new {@link ConfigureSection} with specified values.
+     * <p> The {@link #parent()} of the new section will be this section.
+     * <p> This section will not be saved until {@link #set(String, Object)} is called.
+     * <p> If you want to create and use a section and set it to this section, use {@link #computeSection(String)}.
+     *
+     * @param data The data to be used to create section.
+     * @return Newly created section
+     */
+    @NotNull ConfigureSection createSection(@NotNull String path, @NotNull Map<?, ?> data);
+
+    /**
+     * Creates a new {@link ConfigureSection} with specified values.
+     * <p> The {@link #parent()} of the new section will be this section.
+     *
+     * @param data The data to be used to create section.
+     * @return Newly created section
+     */
+    default @NotNull ConfigureSection createSection(@NotNull String path, @NotNull Consumer<Map<String, Object>> data) {
+        return createSection(path, () -> {
+            Map<String, Object> map = new LinkedHashMap<>();
+            data.accept(map);
+            return map;
+        });
+    }
+
+    /**
+     * Creates a new {@link ConfigureSection} with specified values.
+     * <p> The {@link #parent()} of the new section will be this section.
+     *
+     * @param data The data to be used to create section.
+     * @return Newly created section
+     */
+    default @NotNull ConfigureSection createSection(@NotNull String path, @NotNull Supplier<Map<String, Object>> data) {
+        return createSection(path, data.get());
+    }
+
+    /**
+     * Creates a new empty {@link ConfigureSection}.
+     * <p> The {@link #parent()} of the new section will be this section.
+     *
+     * @return Newly created section
+     */
+    default @NotNull ConfigureSection createSection(@NotNull String path) {
+        return createSection(path, new LinkedHashMap<>());
+    }
+
+    /**
+     * Get or create a section at the given path.
+     * <p>
+     * Any value previously set at this path will be replaced if it is not a section
+     * or will be returned if it is an exists {@link ConfigureSection}.
+     *
+     * @param path The path to get the section from.
+     * @return The section at the path, or a new section if it does not exist.
+     * @see #createSection(String, Map)
+     */
+    default @NotNull ConfigureSection computeSection(@NotNull String path) {
+        return computeSection(path, new LinkedHashMap<>());
+    }
+
+    /**
+     * Get or create a section at the given path.
+     * <p>
+     * Any value previously set at this path will be replaced if it is not a section
+     * or will be returned if it is an exists {@link ConfigureSection}.
+     *
+     * @param path The path to get the section from.
+     * @return The section at the path, or a new section if it does not exist.
+     * @see #createSection(String, Map)
+     */
+    default @NotNull ConfigureSection computeSection(@NotNull String path, @NotNull Map<?, ?> data) {
+        ConfigureSection current = getSection(path);
+        if (current == null) {
+            current = createSection(path, data);
+            set(path, current);
+        }
+        return current;
+    }
+
+    /**
+     * Get or create a section at the given path.
+     * <p>
+     * Any value previously set at this path will be replaced if it is not a section
+     * or will be returned if it is an exists {@link ConfigureSection}.
+     *
+     * @param path The path to get the section from.
+     * @return The section at the path, or a new section if it does not exist.
+     * @see #createSection(String, Map)
+     */
+    default @NotNull ConfigureSection computeSection(@NotNull String path, @NotNull Consumer<Map<String, Object>> data) {
+        return computeSection(path, () -> {
+            Map<String, Object> map = new LinkedHashMap<>();
+            data.accept(map);
+            return map;
+        });
+    }
+
+    /**
+     * Get or create a section at the given path.
+     * <p>
+     * Any value previously set at this path will be replaced if it is not a section
+     * or will be returned if it is an exists {@link ConfigureSection}.
+     *
+     * @param path The path to get the section from.
+     * @return The section at the path, or a new section if it does not exist.
+     * @see #createSection(String, Map)
+     */
+    default @NotNull ConfigureSection computeSection(@NotNull String path, @NotNull Supplier<Map<String, Object>> data) {
+        return computeSection(path, data.get());
+    }
+
+
+    /**
+     * Get the origin value of the path.
+     *
+     * @param path The path to get the value from.
+     * @return The value at the path, or null if not found.
+     */
+    @Nullable Object get(@NotNull String path);
+
+    /**
+     * Get the value of the path for specific type,
+     * if the path does not exist, return null.
+     *
+     * @param path The path to get the value from.
+     * @param type The type class of the value
+     * @param <T>  The type of the value
+     * @return The value at the path, or the default value if not found.
+     */
+    default @Nullable <T> T get(@NotNull String path, @NotNull Class<T> type) {
+        return get(path, null, type);
+    }
+
+    /**
+     * Get the value of the path using a parser function,
+     * if the path does not exist, return NULL.
+     *
+     * @param path   The path to get the value from.
+     * @param parser The function to parse the value
+     * @param <T>    The type of the value
+     * @return The value at the path, or null if not found.
+     */
+    default @Nullable <T> T get(@NotNull String path, @NotNull DataFunction<@Nullable Object, T> parser) {
         return get(path, null, parser);
     }
 
+    /**
+     * Get the value of the path for specific type,
+     * if the path does not exist, return the default value.
+     *
+     * @param path     The path to get the value from.
+     * @param defaults The default value to return if the path does not exist.
+     * @param clazz    The type class of the value
+     * @param <T>      The type of the value
+     * @return The value at the path, or the default value if not found.
+     */
     @Contract("_,!null,_->!null")
-    default @Nullable <T> T get(@NotNull String path, @Nullable T defaultValue, @NotNull Class<T> clazz) {
+    default @Nullable <T> T get(@NotNull String path, @Nullable T defaults, @NotNull Class<T> clazz) {
-        return get(path, defaultValue, DataFunction.castObject(clazz));
+        return get(path, defaults, DataFunction.castObject(clazz));
     }
 
+    /**
+     * Get the value of the path using a parser function,
+     * if the path does not exist, return the default value.
+     *
+     * @param path         The path to get the value from.
+     * @param defaultValue The default value to return if the path does not exist.
+     * @param parser       The function to parse the value
+     * @param <T>          The type of the value
+     * @return The value at the path, or the default value if not found.
+     */
     @Contract("_,!null,_->!null")
     default @Nullable <T> T get(@NotNull String path, @Nullable T defaultValue,
                                 @NotNull DataFunction<Object, T> parser) {
@@ -82,125 +450,290 @@ public interface ConfigureSection {
         return defaultValue;
     }
 
-
+    /**
+     * Predicate the value of given path is a {@link Boolean}.
+     *
+     * @param path The path to check.
+     * @return True if the value is present and is a boolean, false otherwise.
+     */
     default boolean isBoolean(@NotNull String path) {
         return isType(path, Boolean.class);
     }
 
+    /**
+     * Get the value as a {@link Boolean} from the specified path.
+     *
+     * @param path The path to get the boolean.
+     * @return The boolean if the path exists and is a boolean, otherwise false.
+     */
     default boolean getBoolean(@NotNull String path) {
         return getBoolean(path, false);
     }
 
+    /**
+     * Get the value as a {@link Boolean} from the specified path.
+     *
+     * @param path The path to get the boolean.
+     * @param def  The default value to return if the path does not exist.
+     * @return The boolean if the path exists and is a boolean, otherwise the default value.
+     */
     @Contract("_, !null -> !null")
     default @Nullable Boolean getBoolean(@NotNull String path, @Nullable Boolean def) {
         return get(path, def, DataFunction.booleanValue());
     }
 
+    /**
+     * Predicate the value of given path is a {@link Byte}.
+     *
+     * @param path The path to check.
+     * @return True if the value is present and is a byte, false otherwise.
+     */
     default @Nullable Boolean isByte(@NotNull String path) {
         return isType(path, Byte.class);
     }
 
+    /**
+     * Get the value as a {@link Byte} from the specified path.
+     *
+     * @param path The path to get the byte.
+     * @return The byte if the path exists and is a byte, otherwise 0.
+     */
     default @Nullable Byte getByte(@NotNull String path) {
         return getByte(path, (byte) 0);
     }
 
+    /**
+     * Get the value as a {@link Byte} from the specified path.
+     *
+     * @param path The path to get the byte.
+     * @param def  The default value to return if the path does not exist.
+     * @return The byte if the path exists and is a byte, otherwise the default value.
+     */
     @Contract("_, !null -> !null")
     default @Nullable Byte getByte(@NotNull String path, @Nullable Byte def) {
         return get(path, def, DataFunction.byteValue());
     }
 
+    /**
+     * Predicate the value of given path is a {@link Short}.
+     *
+     * @param path The path to check.
+     * @return True if the value is present and is a short, false otherwise.
+     */
     default boolean isShort(@NotNull String path) {
         return isType(path, Short.class);
     }
 
+    /**
+     * Get the value as a {@link Short} from the specified path.
+     *
+     * @param path The path to get the short.
+     * @return The short if the path exists and is a short, otherwise 0.
+     */
     default @Nullable Short getShort(@NotNull String path) {
         return getShort(path, (short) 0);
     }
 
+    /**
+     * Get the value as a {@link Short} from the specified path.
+     *
+     * @param path The path to get the short.
+     * @param def  The default value to return if the path does not exist.
+     * @return The short if the path exists and is a short, otherwise the default value.
+     */
     @Contract("_, !null -> !null")
     default @Nullable Short getShort(@NotNull String path, @Nullable Short def) {
         return get(path, def, DataFunction.shortValue());
     }
 
-
+    /**
+     * Predicate the value of given path is a {@link Integer}.
+     *
+     * @param path The path to check.
+     * @return True if the value is present and is an int, false otherwise.
+     */
     default boolean isInt(@NotNull String path) {
         return isType(path, Integer.class);
     }
 
+    /**
+     * Get the value as a {@link Integer} from the specified path.
+     *
+     * @param path The path to get the int.
+     * @return The int if the path exists and is an int, otherwise 0.
+     */
     default @Nullable Integer getInt(@NotNull String path) {
         return getInt(path, 0);
     }
 
+    /**
+     * Get the value as a {@link Integer} from the specified path.
+     *
+     * @param path The path to get the int.
+     * @param def  The default value to return if the path does not exist.
+     * @return The int if the path exists and is an int, otherwise the default value.
+     */
     @Contract("_, !null -> !null")
     default @Nullable Integer getInt(@NotNull String path, @Nullable Integer def) {
         return get(path, def, DataFunction.intValue());
     }
 
 
+    /**
+     * Predicate the value of given path is a {@link Long}.F
+     *
+     * @param path The path to check.
+     * @return True if the value is present and is a long, false otherwise.
+     */
     default boolean isLong(@NotNull String path) {
         return isType(path, Long.class);
     }
 
+    /**
+     * Get the value as a {@link Long} from the specified path.
+     *
+     * @param path The path to get the long.
+     * @return The long if the path exists and is a long, otherwise 0.
+     */
     default @Nullable Long getLong(@NotNull String path) {
         return getLong(path, 0L);
     }
 
+    /**
+     * Get the value as a {@link Long} from the specified path.
+     *
+     * @param path The path to get the long.
+     * @param def  The default value to return if the path does not exist.
+     * @return The long if the path exists and is a long, otherwise the default value.
+     */
     @Contract("_, !null -> !null")
     default @Nullable Long getLong(@NotNull String path, @Nullable Long def) {
         return get(path, def, DataFunction.longValue());
     }
 
-
+    /**
+     * Predicate the value of given path is a {@link Float}.
+     *
+     * @param path The path to check.
+     * @return True if the value is present and is a float, false otherwise.
+     */
     default boolean isFloat(@NotNull String path) {
         return isType(path, Float.class);
     }
 
+    /**
+     * Get the value as a {@link Float} from the specified path.
+     *
+     * @param path The path to get the float.
+     * @return The float if the path exists and is a float, otherwise 0.
+     */
     default @Nullable Float getFloat(@NotNull String path) {
         return getFloat(path, 0.0F);
     }
 
+    /**
+     * Get the value as a {@link Float} from the specified path.
+     *
+     * @param path The path to get the float.
+     * @param def  The default value to return if the path does not exist.
+     * @return The float if the path exists and is a float, otherwise the default value.
+     */
     @Contract("_, !null -> !null")
     default @Nullable Float getFloat(@NotNull String path, @Nullable Float def) {
         return get(path, def, DataFunction.floatValue());
     }
 
-
+    /**
+     * Predicate the value of given path is a {@link Double}.
+     *
+     * @param path The path to check.
+     * @return True if the value is present and is a double, false otherwise.
+     */
     default boolean isDouble(@NotNull String path) {
         return isType(path, Double.class);
     }
 
+    /**
+     * Get the value as a {@link Double} from the specified path.
+     *
+     * @param path The path to get the double.
+     * @return The double if the path exists and is a double, otherwise 0.
+     */
     default @Nullable Double getDouble(@NotNull String path) {
         return getDouble(path, 0.0D);
     }
 
+    /**
+     * Get the value as a {@link Double} from the specified path.
+     *
+     * @param path The path to get the double.
+     * @param def  The default value to return if the path does not exist.
+     * @return The double if the path exists and is a double, otherwise the default value.
+     */
     @Contract("_, !null -> !null")
     default @Nullable Double getDouble(@NotNull String path, @Nullable Double def) {
         return get(path, def, DataFunction.doubleValue());
     }
 
-
+    /**
+     * Predicate the value of given path is a {@link Character}.
+     *
+     * @param path The path to check.
+     * @return True if the value is present and is a char, false otherwise.
+     */
     default boolean isChar(@NotNull String path) {
         return isType(path, Boolean.class);
     }
 
+    /**
+     * Get the value as a {@link Character} from the specified path.
+     *
+     * @param path The path to get the char.
+     * @return The char if the path exists and is a char, otherwise null.
+     */
     default @Nullable Character getChar(@NotNull String path) {
         return getChar(path, null);
     }
 
+    /**
+     * Get the value as a {@link Character} from the specified path.
+     *
+     * @param path The path to get the char.
+     * @param def  The default value to return if the path does not exist.
+     * @return The char if the path exists and is a char, otherwise the default value.
+     */
     @Contract("_, !null -> !null")
     default @Nullable Character getChar(@NotNull String path, @Nullable Character def) {
         return get(path, def, Character.class);
     }
 
-
+    /**
+     * Predicate the value of given path is a {@link String}.
+     *
+     * @param path The path to check.
+     * @return True if the value is present and is a string, false otherwise.
+     */
     default boolean isString(@NotNull String path) {
         return isType(path, String.class);
     }
 
+    /**
+     * Get the value as a {@link String} from the specified path.
+     *
+     * @param path The path to get the string.
+     * @return The string if the path exists and is a string, otherwise null.
+     */
     default @Nullable String getString(@NotNull String path) {
         return getString(path, null);
     }
 
+    /**
+     * Get the value as a {@link String} from the specified path.
+     *
+     * @param path The path to get the string.
+     * @param def  The default value to return if the path does not exist.
+     * @return The string if the path exists and is a string, otherwise the default value.
+     */
     @Contract("_, !null -> !null")
     default @Nullable String getString(@NotNull String path, @Nullable String def) {
         return get(path, def, String.class);
@@ -298,23 +831,53 @@ public interface ConfigureSection {
         return getList(path, DataFunction.castObject(Character.class));
     }
 
+    /**
+     * Get the specific type of collection from the section.
+     *
+     * @param path        The path to get the collection from
+     * @param constructor The constructor of the collection
+     * @param parser      The function to parse the values
+     * @param <T>         The type of the values
+     * @param <C>         The type of the collection
+     * @return The collection of values
+     */
     default <T, C extends Collection<T>> @NotNull C getCollection(@NotNull String path,
                                                                   @NotNull Supplier<C> constructor,
                                                                   @NotNull DataFunction<Object, T> parser) {
         return parseCollection(getList(path), constructor, parser);
     }
 
+    /**
+     * Get the specific type of steam from the section.
+     *
+     * @param path The path to get the stream from
+     * @return The stream of values
+     */
     default @NotNull Stream<?> stream(@NotNull String path) {
         List<?> values = getList(path);
         return values == null ? Stream.empty() : values.stream();
     }
 
+    /**
+     * Get the specific type of steam from the section.
+     *
+     * @param path   The path to get the stream from
+     * @param parser The function to parse the values
+     * @param <T>    The type of the values
+     * @return The stream of values
+     */
     default <T> @NotNull Stream<T> stream(@NotNull String path, @NotNull Function<Object, T> parser) {
         return stream(path).map(parser);
     }
 
+    default String childPath(String path) {
+        int index = path.indexOf(pathSeparator());
+        return (index == -1) ? path : path.substring(index + 1);
+    }
+
     static <T, C extends Collection<T>> @NotNull C parseCollection(
-            @Nullable List<?> data, @NotNull Supplier<C> constructor,
+            @Nullable List<?> data,
+            @NotNull Supplier<C> constructor,
             @NotNull DataFunction<Object, T> parser
     ) {
         C values = constructor.get();

core/src/main/java/cc/carm/lib/configuration/source/section/ConfigureSource.java

@@ -1,12 +1,21 @@
 package cc.carm.lib.configuration.source.section;
 
 import cc.carm.lib.configuration.source.ConfigurationHolder;
-import org.jetbrains.annotations.NotNull;
+import cc.carm.lib.configuration.source.option.StandardOptions;
-import org.jetbrains.annotations.Nullable;
+import org.jetbrains.annotations.*;
 
-import java.util.List;
 import java.util.Map;
+import java.util.Set;
 
+/**
+ * ConfigureSource represents the source of configuration,
+ * which can be a file, a database, or any other source.
+ *
+ * @param <SECTION>  The type of the root section.
+ * @param <ORIGINAL> The original configuration object.
+ * @param <SELF>     The type of the source itself, for further implement support.
+ * @see ConfigureSection
+ */
 public abstract class ConfigureSource<
         SECTION extends ConfigureSection, ORIGINAL,
         SELF extends ConfigureSource<SECTION, ORIGINAL, SELF>>
@@ -24,28 +33,46 @@ public abstract class ConfigureSource<
         return holder;
     }
 
-
     public void reload() throws Exception {
         onReload(); // 调用重写的Reload方法
         this.lastUpdateMillis = System.currentTimeMillis();
     }
 
-    protected abstract SELF self();
+    @Contract(pure = true)
+    @ApiStatus.Internal
+    protected abstract @NotNull SELF self();
 
     /**
-     * @return Original configuration object
+     * @return The original configuration object.
      */
+    @Contract(pure = true)
     public abstract @NotNull ORIGINAL original();
 
     /**
-     * @return The root {@link ConfigureSection}
+     * @return The root {@link ConfigureSection}, which represents the entire configuration.
      */
     public abstract @NotNull SECTION section();
 
+    /**
+     * Save the whole configuration.
+     *
+     * @throws Exception If any error occurs while saving.
+     */
     public abstract void save() throws Exception;
 
+    /**
+     * Reload the configuration.
+     * <br>This used for implementation, for external usage, use {@link #reload()}
+     *
+     * @throws Exception If any error occurs while reloading.
+     */
+    @ApiStatus.OverrideOnly
     protected abstract void onReload() throws Exception;
 
+    public char pathSeparator() {
+        return holder().options().get(StandardOptions.PATH_SEPARATOR);
+    }
+
     public long getLastUpdateMillis() {
         return this.lastUpdateMillis;
     }
@@ -54,14 +81,20 @@ public abstract class ConfigureSource<
         return getLastUpdateMillis() > parsedTime;
     }
 
+    /**
+     * Source also represents the root section, so it has no parent
+     *
+     * @return null
+     */
     @Override
+    @Contract(pure = true, value = "->null")
     public @Nullable ConfigureSection parent() {
-        return null; // Source also represents the root section, so it has no parent
+        return null;
     }
 
     @Override
-    public @NotNull ConfigureSource<?, ?, ?> source() {
+    public @NotNull String path() {
-        return self();
+        return "";
     }
 
     @Override
@@ -69,34 +102,24 @@ public abstract class ConfigureSource<
         return section().getValues(deep);
     }
 
+    @Override
+    public @NotNull @UnmodifiableView Set<String> getKeys(boolean deep) {
+        return section().getKeys(deep);
+    }
+
+    @Override
+    public @NotNull ConfigureSection createSection(@NotNull String path, @NotNull Map<?, ?> data) {
+        return section().createSection(path, data);
+    }
+
     @Override
     public void set(@NotNull String path, @Nullable Object value) {
         section().set(path, value);
     }
 
     @Override
-    public boolean contains(@NotNull String path) {
+    public void remove(@NotNull String path) {
-        return section().contains(path);
+        section().remove(path);
-    }
-
-    @Override
-    public boolean isList(@NotNull String path) {
-        return section().isList(path);
-    }
-
-    @Override
-    public @Nullable List<?> getList(@NotNull String path) {
-        return section().getList(path);
-    }
-
-    @Override
-    public boolean isSection(@NotNull String path) {
-        return section().isSection(path);
-    }
-
-    @Override
-    public @Nullable ConfigureSection getSection(@NotNull String path) {
-        return section().getSection(path);
     }
 
     @Override

core/src/main/java/cc/carm/lib/configuration/value/ConfigValue.java

@@ -113,7 +113,7 @@ public abstract class ConfigValue<T> extends ValueManifest<T> {
      * @param override Whether to overwrite existing configured value
      */
     public void setDefault(boolean override) {
-        if (!override && config().contains(path())) return;
+        if (config().contains(path()) && !override) return; // Skip if the value is already set
         set(defaults()); // Set the default value
     }
 

core/src/main/java/cc/carm/lib/configuration/value/ValueManifest.java

@@ -4,6 +4,7 @@ import cc.carm.lib.configuration.adapter.ValueType;
 import cc.carm.lib.configuration.source.ConfigurationHolder;
 import cc.carm.lib.configuration.source.meta.ConfigurationMetaHolder;
 import cc.carm.lib.configuration.source.section.ConfigureSource;
+import org.jetbrains.annotations.ApiStatus;
 import org.jetbrains.annotations.NotNull;
 import org.jetbrains.annotations.Nullable;
 
@@ -20,7 +21,6 @@ public class ValueManifest<T> {
 
     protected @NotNull Supplier<@Nullable T> defaultSupplier;
 
-
     public ValueManifest(@NotNull ValueType<T> type) {
         this(type, () -> null, EMPTY_INITIALIZER, null, null);
     }
@@ -93,12 +93,12 @@ public class ValueManifest<T> {
 
     public @NotNull String path() {
         if (path != null) return path;
-        else throw new IllegalStateException("No section path provided.");
+        else throw new IllegalStateException("No section path provided for Value(" + type() + ").");
     }
 
     public @NotNull ConfigurationHolder<?> holder() {
         if (this.holder != null) return this.holder;
-        throw new IllegalStateException("Value does not have a provider.");
+        throw new IllegalStateException("Value(" + type() + ") does not have a provider.");
     }
 
     public @NotNull ConfigureSource<?, ?, ?> config() {
@@ -109,16 +109,17 @@ public class ValueManifest<T> {
         return holder().metadata(path());
     }
 
+    @ApiStatus.Internal
     protected Object getData() {
         return config().get(path());
     }
 
+    @ApiStatus.Internal
     protected void setData(@Nullable Object value) {
         config().set(path(), value);
     }
 
-
+    private static final @NotNull BiConsumer<@NotNull ConfigurationHolder<?>, @NotNull String> EMPTY_INITIALIZER = (provider, valuePath) -> {
-    private static final @NotNull BiConsumer<@NotNull ConfigurationHolder<?>, @NotNull String> EMPTY_INITIALIZER = (provider, path) -> {
     };
 
 }

demo/pom.xml

@@ -5,7 +5,7 @@
     <parent>
         <artifactId>easyconfiguration-parent</artifactId>
         <groupId>cc.carm.lib</groupId>
-        <version>4.0.1</version>
+        <version>4.0.8</version>
     </parent>
     <modelVersion>4.0.0</modelVersion>
     <properties>
@@ -33,6 +33,19 @@
             <scope>compile</scope>
         </dependency>
 
+        <dependency>
+            <groupId>${project.parent.groupId}</groupId>
+            <artifactId>easyconfiguration-feature-versioned</artifactId>
+            <version>${project.parent.version}</version>
+            <scope>compile</scope>
+        </dependency>
+        <dependency>
+            <groupId>cc.carm.lib</groupId>
+            <artifactId>easyconfiguration-feature-versioned</artifactId>
+            <version>4.0.8</version>
+            <scope>compile</scope>
+        </dependency>
+
     </dependencies>
 
     <build>

demo/src/main/java/cc/carm/lib/configuration/demo/DatabaseConfiguration.java

@@ -7,7 +7,7 @@ import cc.carm.lib.configuration.value.ConfigValue;
 import cc.carm.lib.configuration.value.standard.ConfiguredValue;
 
 @HeaderComments({"", "数据库配置", "  用于提供数据库连接，进行数据库操作。"})
-public class DatabaseConfiguration implements Configuration {
+public interface DatabaseConfiguration extends Configuration {
 
     @ConfigPath("driver")
     @HeaderComments({
@@ -16,18 +16,19 @@ public class DatabaseConfiguration implements Configuration {
             "- MySQL(新): com.mysql.cj.jdbc.Driver",
             "- MariaDB(推荐): org.mariadb.jdbc.Driver",
     })
-    protected static final ConfigValue<String> DRIVER_NAME = ConfiguredValue.of(
+    ConfigValue<String> DRIVER_NAME = ConfiguredValue.of(
             String.class, "com.mysql.cj.jdbc.Driver"
     );
 
-    protected static final ConfigValue<String> HOST = ConfiguredValue.of(String.class, "127.0.0.1");
+    ConfigValue<String> HOST = ConfiguredValue.of(String.class, "127.0.0.1");
-    protected static final ConfigValue<Integer> PORT = ConfiguredValue.of(Integer.class, 3306);
+    ConfigValue<Integer> PORT = ConfiguredValue.of(Integer.class, 3306);
-    protected static final ConfigValue<String> DATABASE = ConfiguredValue.of(String.class, "minecraft");
+    ConfigValue<String> DATABASE = ConfiguredValue.of(String.class, "minecraft");
-    protected static final ConfigValue<String> USERNAME = ConfiguredValue.of(String.class, "root");
+    ConfigValue<String> USERNAME = ConfiguredValue.of(String.class, "root");
-    protected static final ConfigValue<String> PASSWORD = ConfiguredValue.of(String.class, "password");
+    ConfigValue<String> PASSWORD = ConfiguredValue.of(String.class, "password");
-    protected static final ConfigValue<String> EXTRA = ConfiguredValue.of(String.class, "?useSSL=false");
 
-    protected static String buildJDBC() {
+    ConfigValue<String> EXTRA = ConfiguredValue.of(String.class, "?useSSL=false");
+
+    static String buildJDBC() {
         return String.format("jdbc:mysql://%s:%s/%s%s", HOST.get(), PORT.get(), DATABASE.get(), EXTRA.get());
     }
 

demo/src/main/java/cc/carm/lib/configuration/demo/tests/ConfigurationTest.java

@@ -69,14 +69,14 @@ public class ConfigurationTest {
         provider.initialize(TEST);
 
         System.out.println("> Test Inner value before:");
-        System.out.println(TEST.INSTANCE.INNER_VALUE.resolve());
+        System.out.println(TEST.INSTANCE.STATUS.resolve());
 
         double after = Math.random() * 200D;
         System.out.println("> Test Inner value -> " + after);
-        TEST.INSTANCE.INNER_VALUE.set(after);
+        TEST.INSTANCE.STATUS.set(after);
 
         System.out.println("> Test Inner value after:");
-        System.out.println(TEST.INSTANCE.INNER_VALUE.resolve());
+        System.out.println(TEST.INSTANCE.STATUS.resolve());
 
     }
 

demo/src/main/java/cc/carm/lib/configuration/demo/tests/conf/DemoConfiguration.java

@@ -1,11 +1,7 @@
 package cc.carm.lib.configuration.demo.tests.conf;
 
 import cc.carm.lib.configuration.Configuration;
-import cc.carm.lib.configuration.annotation.ConfigPath;
+import cc.carm.lib.configuration.annotation.*;
-import cc.carm.lib.configuration.annotation.FooterComments;
-import cc.carm.lib.configuration.annotation.HeaderComments;
-import cc.carm.lib.configuration.annotation.InlineComment;
-import cc.carm.lib.configuration.demo.DatabaseConfiguration;
 import cc.carm.lib.configuration.demo.tests.model.ItemStack;
 import cc.carm.lib.configuration.demo.tests.model.UserRecord;
 import cc.carm.lib.configuration.value.ConfigValue;
@@ -29,7 +25,8 @@ import java.util.UUID;
 public interface DemoConfiguration extends Configuration {
 
     @ConfigPath(root = true)
-    ConfigValue<Double> VERSION = ConfiguredValue.of(Double.class, 1.0D);
+    @ConfigVersion(2)
+    ConfigValue<Double> VERSION = ConfiguredValue.of(Double.class, 2.0D);
 
     @ConfigPath(root = true)
     @FooterComments({"此处内容将显示在配置条目的下方", "可用于补充说明，但一般不建议使用"})
@@ -39,10 +36,6 @@ public interface DemoConfiguration extends Configuration {
     @FooterComments({"上述的枚举内容本质上是通过STRING解析的"})
     ConfigValue<ChronoUnit> TEST_ENUM = ConfiguredValue.of(ChronoUnit.class, ChronoUnit.DAYS);
 
-    // 支持通过 Class<?> 变量标注子配置，一并注册。
-    // 注意： 若对应类也有注解，则优先使用类的注解。
-    Class<?> DATABASE = DatabaseConfiguration.class;
-
     @ConfigPath("registered_users") // 通过注解规定配置文件中的路径，若不进行注解则以变量名自动生成。
     @HeaderComments({"Section类型数据测试"}) // 通过注解给配置添加注释。
     @InlineComment("默认地注释会加到Section的首行末尾") // 通过注解给配置添加注释。

demo/src/main/java/cc/carm/lib/configuration/demo/tests/conf/InstanceConfig.java

@@ -8,6 +8,6 @@ import cc.carm.lib.configuration.value.standard.ConfiguredValue;
 @HeaderComments("Inner Test")
 public class InstanceConfig implements Configuration {
 
-    public final ConfigValue<Double> INNER_VALUE = ConfiguredValue.of(1.0D);
+    public final ConfigValue<Double> STATUS = ConfiguredValue.of(1.0D);
 
 }

demo/src/main/java/cc/carm/lib/configuration/demo/tests/conf/RegistryConfig.java

@@ -20,7 +20,7 @@ public class RegistryConfig implements Configuration {
     @FooterComments({"12313213212"})
     @InlineComment(value = "用户名(匹配注释)", regex = "name") // 通过注解给配置添加注释。
     @InlineComment(value = "信息", regex = {"info.*", "info.game.*"}) // 通过注解给配置添加注释。
-    public final ConfigValue<UserRecord> TEST_MODEL = ConfiguredValue.builderOf(UserRecord.class).fromSection()
+    public final ConfigValue<UserRecord> OWNER = ConfiguredValue.builderOf(UserRecord.class).fromSection()
             .defaults(new UserRecord("Carm", UUID.randomUUID()))
             .parse((holder, section) -> UserRecord.deserialize(section))
             .serialize((holder, data) -> data.serialize()).build();

demo/src/main/java/cc/carm/lib/configuration/demo/tests/model/UserRecord.java

@@ -36,6 +36,7 @@ public class UserRecord extends AbstractRecord {
     }
 
     public static UserRecord deserialize(ConfigureSection section) {
+        System.out.println(">  Deserializing  -> " + section.fullPath());
         String name = section.getString("name");
         if (name == null) throw new NullPointerException("name is null");
         String uuidString = section.getString("info.uuid");

features/commentable/pom.xml

@@ -6,7 +6,7 @@
     <parent>
         <groupId>cc.carm.lib</groupId>
         <artifactId>easyconfiguration-parent</artifactId>
-        <version>4.0.1</version>
+        <version>4.0.8</version>
         <relativePath>../../pom.xml</relativePath>
     </parent>
     <properties>

features/commentable/src/main/java/cc/carm/lib/configuration/annotation/InlineComment.java

@@ -44,6 +44,9 @@ public @interface InlineComment {
      *         bar: "foobar" # Comment Contents
      * </pre></blockquote>
      *
+     * <p><i>Some implements may not support this feature
+     * in list values or other complex structures.</i>
+     *
      * @return The path regexes of this comment
      */
     @NotNull

features/commentable/src/main/java/cc/carm/lib/configuration/annotation/InlineComments.java

@@ -9,7 +9,12 @@ import java.lang.annotation.Target;
 @Retention(RetentionPolicy.RUNTIME)
 public @interface InlineComments {
 
-
+    /**
+     * Multiple inline comments support.
+     *
+     * @return inline comment contents.
+     * @see InlineComment
+     */
     InlineComment[] value();
 
 }

features/commentable/src/main/java/cc/carm/lib/configuration/commentable/Commentable.java

@@ -26,7 +26,7 @@ public class Commentable {
         String comment = getInlineComment(holder, path, null);
         if (comment != null) return comment;
 
-        String sep = String.valueOf(holder.options().get(StandardOptions.PATH_SEPARATOR));
+        String sep = String.valueOf(holder.option(StandardOptions.PATH_SEPARATOR));
 
         // If the comment is not found, try to get the comment from the parent section
         String[] keys = path.split(Pattern.quote(sep));

features/file/pom.xml

@@ -6,7 +6,7 @@
     <parent>
         <groupId>cc.carm.lib</groupId>
         <artifactId>easyconfiguration-parent</artifactId>
-        <version>4.0.1</version>
+        <version>4.0.8</version>
         <relativePath>../../pom.xml</relativePath>
     </parent>
     <properties>

features/section/pom.xml

@@ -6,7 +6,7 @@
     <parent>
         <groupId>cc.carm.lib</groupId>
         <artifactId>easyconfiguration-parent</artifactId>
-        <version>4.0.1</version>
+        <version>4.0.8</version>
         <relativePath>../../pom.xml</relativePath>
     </parent>
     <properties>

features/section/src/main/java/cc/carm/lib/configuration/source/section/AbstractMapSection.java

@@ -0,0 +1,188 @@
+package cc.carm.lib.configuration.source.section;
+
+import org.jetbrains.annotations.NotNull;
+import org.jetbrains.annotations.Nullable;
+import org.jetbrains.annotations.UnmodifiableView;
+
+import java.util.*;
+
+public abstract class AbstractMapSection<R extends AbstractMapSection<R>> implements ConfigureSection {
+
+    protected final @NotNull Map<String, Object> data;
+    protected final @Nullable R parent;
+    protected final @NotNull String path;
+
+    protected AbstractMapSection(@Nullable R parent, @NotNull String path) {
+        this.parent = parent;
+        this.path = path;
+        this.data = new LinkedHashMap<>();
+    }
+
+    public void migrate(Map<?, ?> data) {
+        for (Map.Entry<?, ?> entry : data.entrySet()) {
+            String key = (entry.getKey() == null) ? "" : entry.getKey().toString();
+            if (entry.getValue() instanceof Map) {
+                this.data.put(key, createSection(key, (Map<?, ?>) entry.getValue()));
+            } else if (entry.getValue() instanceof List) {
+                List<Object> list = new ArrayList<>();
+                int index = 0;
+                for (Object obj : (List<?>) entry.getValue()) {
+                    if (obj instanceof Map) {
+                        list.add(createSection(key + "[" + index + "]", (Map<?, ?>) obj));
+                    } else {
+                        list.add(obj);
+                    }
+                    index++;
+                }
+                this.data.put(key, list);
+            } else {
+                this.data.put(key, entry.getValue());
+            }
+        }
+    }
+
+    public abstract @NotNull R self();
+
+    @Override
+    public abstract @NotNull R createSection(@NotNull String path, @NotNull Map<?, ?> data);
+
+    @Override
+    public @NotNull String path() {
+        return this.path;
+    }
+
+    @Override
+    public boolean contains(@NotNull String path) {
+        R section = getSectionFor(path);
+        if (section == this) {
+            return this.data().containsKey(path);
+        } else {
+            return section.contains(childPath(path));
+        }
+    }
+
+    public @NotNull Map<String, Object> data() {
+        return this.data;
+    }
+
+    @Override
+    public boolean isEmpty() {
+        return this.data.isEmpty();
+    }
+
+    @Override
+    public int size(boolean deep) {
+        return deep ? getKeys(true).size() : this.data.size();
+    }
+
+    @UnmodifiableView
+    public @NotNull Map<String, Object> rawMap() {
+        Map<String, Object> output = new LinkedHashMap<>();
+        for (Map.Entry<String, Object> entry : this.data.entrySet()) {
+            if (entry.getValue() instanceof AbstractMapSection<?>) {
+                output.put(entry.getKey(), ((AbstractMapSection<?>) entry.getValue()).rawMap());
+            } else if (entry.getValue() instanceof List<?>) {
+                List<Object> list = new ArrayList<>();
+                for (Object obj : (List<?>) entry.getValue()) {
+                    if (obj instanceof AbstractMapSection<?>) {
+                        list.add(((AbstractMapSection<?>) obj).rawMap());
+                    } else {
+                        list.add(obj);
+                    }
+                }
+                output.put(entry.getKey(), list);
+            } else {
+                output.put(entry.getKey(), entry.getValue());
+            }
+        }
+        return output;
+    }
+
+    public @Nullable R parent() {
+        return this.parent;
+    }
+
+
+    @Override
+    public @NotNull Map<String, Object> getValues(boolean deep) {
+        return Collections.unmodifiableMap(deep ? mappingValues(this, null, true, String.valueOf(pathSeparator())) : data());
+    }
+
+    @Override
+    public @NotNull @UnmodifiableView Set<String> getKeys(boolean deep) {
+        return Collections.unmodifiableSet(deep ? mappingKeys(this, null, true, String.valueOf(pathSeparator())) : data().keySet());
+    }
+
+    @Override
+    public void set(@NotNull String path, @Nullable Object value) {
+        if (value instanceof Map) value = createSection(path, (Map<?, ?>) value);
+
+        R section = getSectionFor(path);
+        if (section == this) {
+            // Even this value is null, we still need to put it in the map
+            // to ensure that the path is marked as existing.
+            this.data.put(path, value);
+        } else {
+            section.set(childPath(path), value);
+        }
+    }
+
+    @Override
+    public void remove(@NotNull String path) {
+        R section = getSectionFor(path);
+        if (section != this) {
+            section.remove(childPath(path));
+        } else {
+            this.data.remove(path);
+        }
+    }
+
+    @Override
+    public @Nullable Object get(@NotNull String path) {
+        R section = getSectionFor(path);
+        return section == this ? data.get(path) : section.get(childPath(path));
+    }
+
+    @SuppressWarnings("unchecked")
+    private R getSectionFor(String path) {
+        int index = path.indexOf(pathSeparator());
+        if (index == -1) return self();
+
+        String root = path.substring(0, index);
+        return (R) computeSection(root);
+    }
+
+    /**
+     * Map the values of the children of the section to the output map.
+     *
+     * @param section The section to map the values from
+     * @param parent  The parent path
+     * @param deep    If the mapping should be deep
+     */
+    protected static Map<String, Object> mappingValues(@NotNull AbstractMapSection<?> section, @Nullable String parent, boolean deep, String pathSeparator) {
+        Map<String, Object> output = new LinkedHashMap<>();
+        for (Map.Entry<String, Object> entry : section.data().entrySet()) {
+            String path = (parent == null ? "" : parent + pathSeparator) + entry.getKey();
+            output.remove(path);
+            output.put(path, entry.getValue());
+            if (deep && entry.getValue() instanceof AbstractMapSection<?>) {
+                output.putAll(mappingValues((AbstractMapSection<?>) entry.getValue(), path, true, pathSeparator));
+            }
+        }
+        return output;
+    }
+
+    protected static Set<String> mappingKeys(@NotNull AbstractMapSection<?> section, @Nullable String parent, boolean deep, String pathSeparator) {
+        Set<String> keys = new LinkedHashSet<>();
+        for (Map.Entry<String, Object> entry : section.data().entrySet()) {
+            String path = (parent == null ? "" : parent + pathSeparator) + entry.getKey();
+            keys.add(path);
+            if (deep && entry.getValue() instanceof AbstractMapSection<?>) {
+                keys.addAll(mappingKeys((AbstractMapSection<?>) entry.getValue(), path, true, pathSeparator));
+            }
+        }
+        return keys;
+    }
+
+
+}

features/section/src/main/java/cc/carm/lib/configuration/source/section/ImmutableSection.java

@@ -0,0 +1,377 @@
+package cc.carm.lib.configuration.source.section;
+
+import cc.carm.lib.configuration.function.DataFunction;
+import org.jetbrains.annotations.NotNull;
+import org.jetbrains.annotations.Nullable;
+import org.jetbrains.annotations.UnmodifiableView;
+
+import java.util.*;
+import java.util.function.BiConsumer;
+import java.util.function.Function;
+import java.util.function.Supplier;
+import java.util.stream.Stream;
+
+public class ImmutableSection implements ConfigureSection {
+
+    public static ImmutableSection of(@NotNull ConfigureSection section) {
+        if (section instanceof ImmutableSection) {
+            return (ImmutableSection) section;
+        } else return new ImmutableSection(null, section);
+    }
+
+    protected final @Nullable ImmutableSection parent;
+    protected final @NotNull ConfigureSection section;
+
+    private ImmutableSection(@Nullable ImmutableSection parent, @NotNull ConfigureSection section) {
+        this.parent = parent;
+        this.section = section;
+    }
+
+    @Override
+    public @Nullable ImmutableSection parent() {
+        return this.parent;
+    }
+
+    @Override
+    public @NotNull String path() {
+        return section().path();
+    }
+
+    private @NotNull ConfigureSection section() {
+        return section;
+    }
+
+    @Override
+    public @NotNull @UnmodifiableView Map<String, Object> getValues(boolean deep) {
+        return section().getValues(deep);
+    }
+
+    @Override
+    public void set(@NotNull String path, @Nullable Object value) {
+        throw new IllegalStateException("This section is not modifiable!");
+    }
+
+    @Override
+    public void remove(@NotNull String path) {
+        throw new IllegalStateException("This section is not modifiable!");
+    }
+
+    @Override
+    public @NotNull ImmutableSection createSection(@NotNull String path, @NotNull Map<?, ?> data) {
+        return new ImmutableSection(this, section().createSection(path, data));
+    }
+
+    @Override
+    public @Nullable Object get(@NotNull String path) {
+        Object value = section().get(path);
+        if (value instanceof ConfigureSection && !(value instanceof ImmutableSection)) {
+            return new ImmutableSection(this, (ConfigureSection) value);
+        }
+        return value;
+    }
+
+    @Override
+    public @Nullable ConfigureSection getSection(@NotNull String path) {
+        ConfigureSection get = section().getSection(path);
+        if (get != null && !(get instanceof ImmutableSection)) {
+            return new ImmutableSection(this, get);
+        }
+        return get;
+    }
+
+    @Override
+    public char pathSeparator() {
+        return section().pathSeparator();
+    }
+
+    @Override
+    public boolean isRoot() {
+        return section().isRoot();
+    }
+
+    @Override
+    public boolean isEmpty() {
+        return section().isEmpty();
+    }
+
+    @Override
+    public @NotNull @UnmodifiableView Set<String> getKeys(boolean deep) {
+        return section().getKeys(deep);
+    }
+
+    @Override
+    public @NotNull @UnmodifiableView Set<String> keys() {
+        return section().keys();
+    }
+
+    @Override
+    public @NotNull @UnmodifiableView Map<String, Object> values() {
+        return section().values();
+    }
+
+    @Override
+    public Stream<Map.Entry<String, Object>> stream() {
+        return section().stream();
+    }
+
+    @Override
+    public void forEach(@NotNull BiConsumer<String, Object> action) {
+        section().forEach(action);
+    }
+
+    @Override
+    public boolean contains(@NotNull String path) {
+        return section().contains(path);
+    }
+
+    @Override
+    public boolean containsValue(@NotNull String path) {
+        return section().containsValue(path);
+    }
+
+    @Override
+    public <T> boolean isType(@NotNull String path, @NotNull Class<T> typeClass) {
+        return section().isType(path, typeClass);
+    }
+
+    @Override
+    public boolean isList(@NotNull String path) {
+        return section().isList(path);
+    }
+
+    @Override
+    public @Nullable List<?> getList(@NotNull String path) {
+        return section().getList(path);
+    }
+
+    @Override
+    public boolean isSection(@NotNull String path) {
+        return section().isSection(path);
+    }
+
+    @Override
+    public <T> @Nullable T get(@NotNull String path, @NotNull Class<T> type) {
+        return section().get(path, type);
+    }
+
+    @Override
+    public <T> @Nullable T get(@NotNull String path, @NotNull DataFunction<@Nullable Object, T> parser) {
+        return section().get(path, parser);
+    }
+
+    @Override
+    public <T> @Nullable T get(@NotNull String path, @Nullable T defaults, @NotNull Class<T> clazz) {
+        return section().get(path, defaults, clazz);
+    }
+
+    @Override
+    public <T> @Nullable T get(@NotNull String path, @Nullable T defaultValue, @NotNull DataFunction<Object, T> parser) {
+        return section().get(path, defaultValue, parser);
+    }
+
+    @Override
+    public boolean isBoolean(@NotNull String path) {
+        return section().isBoolean(path);
+    }
+
+    @Override
+    public boolean getBoolean(@NotNull String path) {
+        return section().getBoolean(path);
+    }
+
+    @Override
+    public @Nullable Boolean getBoolean(@NotNull String path, @Nullable Boolean def) {
+        return section().getBoolean(path, def);
+    }
+
+    @Override
+    public @Nullable Boolean isByte(@NotNull String path) {
+        return section().isByte(path);
+    }
+
+    @Override
+    public @Nullable Byte getByte(@NotNull String path) {
+        return section().getByte(path);
+    }
+
+    @Override
+    public @Nullable Byte getByte(@NotNull String path, @Nullable Byte def) {
+        return section().getByte(path, def);
+    }
+
+    @Override
+    public boolean isShort(@NotNull String path) {
+        return section().isShort(path);
+    }
+
+    @Override
+    public @Nullable Short getShort(@NotNull String path) {
+        return section().getShort(path);
+    }
+
+    @Override
+    public @Nullable Short getShort(@NotNull String path, @Nullable Short def) {
+        return section().getShort(path, def);
+    }
+
+    @Override
+    public boolean isInt(@NotNull String path) {
+        return section().isInt(path);
+    }
+
+    @Override
+    public @Nullable Integer getInt(@NotNull String path) {
+        return section().getInt(path);
+    }
+
+    @Override
+    public @Nullable Integer getInt(@NotNull String path, @Nullable Integer def) {
+        return section().getInt(path, def);
+    }
+
+    @Override
+    public boolean isLong(@NotNull String path) {
+        return section().isLong(path);
+    }
+
+    @Override
+    public @Nullable Long getLong(@NotNull String path) {
+        return section().getLong(path);
+    }
+
+    @Override
+    public @Nullable Long getLong(@NotNull String path, @Nullable Long def) {
+        return section().getLong(path, def);
+    }
+
+    @Override
+    public boolean isFloat(@NotNull String path) {
+        return section().isFloat(path);
+    }
+
+    @Override
+    public @Nullable Float getFloat(@NotNull String path) {
+        return section().getFloat(path);
+    }
+
+    @Override
+    public @Nullable Float getFloat(@NotNull String path, @Nullable Float def) {
+        return section().getFloat(path, def);
+    }
+
+    @Override
+    public boolean isDouble(@NotNull String path) {
+        return section().isDouble(path);
+    }
+
+    @Override
+    public @Nullable Double getDouble(@NotNull String path) {
+        return section().getDouble(path);
+    }
+
+    @Override
+    public @Nullable Double getDouble(@NotNull String path, @Nullable Double def) {
+        return section().getDouble(path, def);
+    }
+
+    @Override
+    public boolean isChar(@NotNull String path) {
+        return section().isChar(path);
+    }
+
+    @Override
+    public @Nullable Character getChar(@NotNull String path) {
+        return section().getChar(path);
+    }
+
+    @Override
+    public @Nullable Character getChar(@NotNull String path, @Nullable Character def) {
+        return section().getChar(path, def);
+    }
+
+    @Override
+    public boolean isString(@NotNull String path) {
+        return section().isString(path);
+    }
+
+    @Override
+    public @Nullable String getString(@NotNull String path) {
+        return section().getString(path);
+    }
+
+    @Override
+    public @Nullable String getString(@NotNull String path, @Nullable String def) {
+        return section().getString(path, def);
+    }
+
+    @Override
+    public @NotNull <V> List<V> getList(@NotNull String path, @NotNull DataFunction<Object, V> parser) {
+        return section().getList(path, parser);
+    }
+
+    @Override
+    public @NotNull List<String> getStringList(@NotNull String path) {
+        return section().getStringList(path);
+    }
+
+    @Override
+    public @NotNull List<Integer> getIntegerList(@NotNull String path) {
+        return section().getIntegerList(path);
+    }
+
+    @Override
+    public @NotNull List<Long> getLongList(@NotNull String path) {
+        return section().getLongList(path);
+    }
+
+    @Override
+    public @NotNull List<Double> getDoubleList(@NotNull String path) {
+        return section().getDoubleList(path);
+    }
+
+    @Override
+    public @NotNull List<Float> getFloatList(@NotNull String path) {
+        return section().getFloatList(path);
+    }
+
+    @Override
+    public @NotNull List<Byte> getByteList(@NotNull String path) {
+        return section().getByteList(path);
+    }
+
+    @Override
+    public @NotNull List<Character> getCharList(@NotNull String path) {
+        return section().getCharList(path);
+    }
+
+    @Override
+    public <T, C extends Collection<T>> @NotNull C getCollection(@NotNull String path, @NotNull Supplier<C> constructor, @NotNull DataFunction<Object, T> parser) {
+        return section().getCollection(path, constructor, parser);
+    }
+
+    @Override
+    public @NotNull Stream<?> stream(@NotNull String path) {
+        return section().stream(path);
+    }
+
+    @Override
+    public @NotNull <T> Stream<T> stream(@NotNull String path, @NotNull Function<Object, T> parser) {
+        return section().stream(path, parser);
+    }
+
+    @Override
+    public String childPath(String path) {
+        return section().childPath(path);
+    }
+
+    @Override
+    public int hashCode() {
+        return section.hashCode();
+    }
+
+    @Override
+    public boolean equals(Object obj) {
+        return Objects.equals(section, obj);
+    }
+
+}

features/section/src/main/java/cc/carm/lib/configuration/source/section/MemorySection.java

@@ -3,148 +3,54 @@ package cc.carm.lib.configuration.source.section;
 import org.jetbrains.annotations.NotNull;
 import org.jetbrains.annotations.Nullable;
 
-import java.util.*;
+import java.util.LinkedHashMap;
+import java.util.Map;
+import java.util.function.Consumer;
+import java.util.function.Supplier;
 
-public class MemorySection implements ConfigureSection {
+public class MemorySection extends AbstractMapSection<MemorySection> {
 
-    public static @NotNull MemorySection root(@NotNull ConfigureSource<? extends MemorySection, ?, ?> source) {
+    public static MemorySection of() {
-        return new MemorySection(source, new LinkedHashMap<>(), null);
+        return of(new LinkedHashMap<>());
     }
 
-    public static @NotNull MemorySection root(@NotNull ConfigureSource<? extends MemorySection, ?, ?> source,
+    public static MemorySection of(@NotNull Consumer<Map<String, Object>> data) {
-                                              @Nullable Map<?, ?> data) {
+        return of(() -> {
-        return new MemorySection(source, data == null ? new LinkedHashMap<>() : data, null);
+            Map<String, Object> map = new LinkedHashMap<>();
+            data.accept(map);
+            return map;
+        });
     }
 
-    protected final @NotNull ConfigureSource<? extends MemorySection, ?, ?> source;
+    public static MemorySection of(@NotNull Supplier<Map<?, ?>> data) {
-    protected final @NotNull Map<String, Object> data;
+        return of(data.get());
-    protected final @Nullable MemorySection parent;
-
-    public MemorySection(@NotNull ConfigureSource<? extends MemorySection, ?, ?> source,
-                         @NotNull Map<?, ?> data, @Nullable MemorySection parent) {
-        this.source = source;
-        this.parent = parent;
-        this.data = new LinkedHashMap<>();
-        for (Map.Entry<?, ?> entry : data.entrySet()) {
-            String key = (entry.getKey() == null) ? "null" : entry.getKey().toString();
-            if (entry.getValue() instanceof Map) {
-                this.data.put(key, createChild((Map<?, ?>) entry.getValue()));
-            } else if (entry.getValue() instanceof List) {
-                List<Object> list = new ArrayList<>();
-                for (Object obj : (List<?>) entry.getValue()) {
-                    if (obj instanceof Map) {
-                        list.add(createChild((Map<?, ?>) obj));
-                    } else {
-                        list.add(obj);
-                    }
-                }
-                this.data.put(key, list);
-            } else {
-                this.data.put(key, entry.getValue());
-            }
-        }
     }
 
-    protected @NotNull MemorySection createChild(@NotNull Map<?, ?> data) {
+    public static MemorySection of(@NotNull Map<?, ?> data) {
-        return new MemorySection(source(), data, this);
+        return of(data, null, "");
     }
 
-    protected @NotNull MemorySection createChild() {
+    public static MemorySection of(@Nullable MemorySection parent, @NotNull String path) {
-        return createChild(new LinkedHashMap<>());
+        return of(new LinkedHashMap<>(), parent, path);
+    }
+
+    public static MemorySection of(@NotNull Map<?, ?> data, @Nullable MemorySection parent, @NotNull String path) {
+        return new MemorySection(data, parent, path);
+    }
+
+    public MemorySection(@NotNull Map<?, ?> raw, @Nullable MemorySection parent, @NotNull String path) {
+        super(parent, path);
+        migrate(raw);
     }
 
     @Override
-    public @NotNull ConfigureSource<? extends MemorySection, ?, ?> source() {
+    public @NotNull MemorySection self() {
-        return this.source;
+        return this;
-    }
-
-    public @NotNull Map<String, Object> data() {
-        return this.data;
-    }
-
-    public @Nullable MemorySection parent() {
-        return this.parent;
     }
 
     @Override
-    public @NotNull Map<String, Object> getValues(boolean deep) {
+    public @NotNull MemorySection createSection(@NotNull String path, @NotNull Map<?, ?> data) {
-        return Collections.unmodifiableMap(deep ? mapChildrenValues(this, null, true) : data());
+        return new MemorySection(data, this, path);
     }
 
-    @Override
-    public void set(@NotNull String path, @Nullable Object value) {
-        if (value instanceof Map) value = createChild((Map<?, ?>) value);
-
-        MemorySection section = getSectionFor(path);
-        if (section == this) {
-            // Even this value is null, we still need to put it in the map
-            // to ensure that the path is marked as existing.
-            this.data.put(path, value);
-        } else {
-            section.set(childPath(path), value);
-        }
-    }
-
-    @Override
-    public boolean contains(@NotNull String path) {
-        return get(path) != null;
-    }
-
-    @Override
-    public @Nullable Object get(@NotNull String path) {
-        MemorySection section = getSectionFor(path);
-        return section == this ? data.get(path) : section.get(childPath(path));
-    }
-
-    @Override
-    public @Nullable List<?> getList(@NotNull String path) {
-        Object val = get(path);
-        return (val instanceof List<?>) ? (List<?>) val : null;
-    }
-
-    @Override
-    public @Nullable ConfigureSection getSection(@NotNull String path) {
-        Object val = get(path);
-        return (val instanceof ConfigureSection) ? (ConfigureSection) val : null;
-    }
-
-    private MemorySection getSectionFor(String path) {
-        int index = path.indexOf(separator());
-        if (index == -1) return this;
-
-        String root = path.substring(0, index);
-        Object section = this.data.get(root);
-        if (section == null) {
-            section = createChild();
-            this.data.put(root, section);
-        }
-
-        return (MemorySection) section;
-    }
-
-    private String childPath(String path) {
-        int index = path.indexOf(separator());
-        return (index == -1) ? path : path.substring(index + 1);
-    }
-
-    /**
-     * Map the values of the children of the section to the output map.
-     *
-     * @param section The section to map the values from
-     * @param parent  The parent path
-     * @param deep    If the mapping should be deep
-     */
-    protected Map<String, Object> mapChildrenValues(@NotNull MemorySection section,
-                                                    @Nullable String parent, boolean deep) {
-        Map<String, Object> output = new LinkedHashMap<>();
-        for (Map.Entry<String, Object> entry : section.data().entrySet()) {
-            String path = (parent == null ? "" : parent + separator()) + entry.getKey();
-            output.remove(path);
-            output.put(path, entry.getValue());
-            if (deep && entry.getValue() instanceof MemorySection) {
-                output.putAll(mapChildrenValues((MemorySection) entry.getValue(), path, true));
-            }
-        }
-        return output;
-    }
 }

features/section/src/main/java/cc/carm/lib/configuration/source/section/ShadedSection.java

@@ -0,0 +1,145 @@
+package cc.carm.lib.configuration.source.section;
+
+import org.jetbrains.annotations.NotNull;
+import org.jetbrains.annotations.Nullable;
+import org.jetbrains.annotations.UnmodifiableView;
+
+import java.util.*;
+
+public class ShadedSection implements ConfigureSection {
+
+    public static ShadedSection create(@NotNull ConfigureSection template, @Nullable ConfigureSection source) {
+        return new ShadedSection(null, template, source);
+    }
+
+    protected final @Nullable ShadedSection parent;
+    protected @NotNull ConfigureSection template;
+    protected @Nullable ConfigureSection source;
+
+    public ShadedSection(@Nullable ShadedSection parent,
+                         @NotNull ConfigureSection template, @Nullable ConfigureSection source) {
+        this.parent = parent;
+        this.template = template;
+        this.source = source;
+    }
+
+    @Override
+    public @Nullable ConfigureSection parent() {
+        return this.parent;
+    }
+
+    @Override
+    public @NotNull String path() {
+        return this.template.path();
+    }
+
+    @Override
+    public @NotNull @UnmodifiableView Map<String, Object> getValues(boolean deep) {
+        if (source == null) return template.getValues(deep);
+        // 本函数为，当 getValues 时，递归合并 source 和 template
+        return merge(template, source).getValues(deep);
+    }
+
+    @Override
+    public @NotNull @UnmodifiableView Set<String> getKeys(boolean deep) {
+        Set<String> keys = new HashSet<>(template.getKeys(deep));
+        if (source != null) {
+            keys.addAll(source.getKeys(deep));
+        }
+        return Collections.unmodifiableSet(keys);
+    }
+
+    private ConfigureSection merge(ConfigureSection templateSection, ConfigureSection valueSection) {
+        MemorySection merged = MemorySection.of();
+        Set<String> existingKey = new HashSet<>();
+
+        for (Map.Entry<String, Object> entry : valueSection.getValues(false).entrySet()) {
+            String key = entry.getKey();
+            Object value = entry.getValue();
+            if (value instanceof ConfigureSection) {
+                ConfigureSection subSectionFromValue = (ConfigureSection) value;
+                ConfigureSection subSectionFromTemplate = (ConfigureSection) templateSection.get(key);
+                if (subSectionFromTemplate == null) {
+                    merged.set(key, value);
+                } else {
+                    merged.set(key, merge(subSectionFromTemplate, subSectionFromValue));
+                }
+            } else {
+                merged.set(key, value);
+            }
+            existingKey.add(key);
+        }
+
+        for (Map.Entry<String, Object> entry : templateSection.getValues(false).entrySet()) {
+            if (existingKey.contains(entry.getKey())) continue;
+            merged.set(entry.getKey(), entry.getValue());
+        }
+
+        return merged;
+    }
+
+    @Override
+    public void set(@NotNull String path, @Nullable Object value) {
+        if (value instanceof ConfigureSection) {
+            ConfigureSection targetSection = (ConfigureSection) value;
+            for (Map.Entry<String, Object> entry : targetSection.getValues(true).entrySet()) {
+                set(path + pathSeparator() + entry.getKey(), entry.getValue());
+            }
+            return;
+        } else if (Objects.equals(get(path), value)) {
+            remove(path);
+            return;
+        }
+
+        Optional.ofNullable(source).ifPresent(s -> s.set(path, value));
+    }
+
+    @Override
+    public void remove(@NotNull String path) {
+        Optional.ofNullable(source).ifPresent(s -> s.remove(path));
+    }
+
+    @Override
+    public @NotNull ConfigureSection createSection(@NotNull String path, @NotNull Map<?, ?> data) {
+        if (source == null) {
+            return new ShadedSection(this, template, MemorySection.of(data));
+        } else {
+            ConfigureSection section = source.computeSection(path, data);
+            return new ShadedSection(this, template, section);
+        }
+    }
+
+    @Override
+    public @Nullable Object get(@NotNull String path) {
+        if (source == null) {
+            return getFromTemplate(path);
+        }
+
+        Object value = source.get(path);
+        if (value == null) {
+            return getFromTemplate(path);
+        }
+        if (value instanceof ConfigureSection) {
+            ConfigureSection templateSection = (ConfigureSection) template.get(path);
+            if (templateSection == null) {
+                return value;
+            } else {
+                return new ShadedSection(this, templateSection, (ConfigureSection) value);
+            }
+        }
+        return value;
+    }
+
+    public @Nullable Object getFromTemplate(@NotNull String path) {
+        Object value = template.get(path);
+        if (value instanceof ConfigureSection) {
+            return new ShadedSection(this, (ConfigureSection) value, null);
+        } else {
+            return value;
+        }
+    }
+
+    public @Nullable ConfigureSection getSource() {
+        return source;
+    }
+}

features/section/src/main/java/cc/carm/lib/configuration/source/section/SourcedSection.java

@@ -0,0 +1,48 @@
+package cc.carm.lib.configuration.source.section;
+
+import org.jetbrains.annotations.NotNull;
+import org.jetbrains.annotations.Nullable;
+
+import java.util.LinkedHashMap;
+import java.util.Map;
+
+public class SourcedSection extends AbstractMapSection<SourcedSection> {
+
+    public static @NotNull SourcedSection root(@NotNull ConfigureSource<? extends SourcedSection, ?, ?> source) {
+        return new SourcedSection(source, new LinkedHashMap<>(), null, "");
+    }
+
+    public static @NotNull SourcedSection root(@NotNull ConfigureSource<? extends SourcedSection, ?, ?> source,
+                                               @Nullable Map<?, ?> raw) {
+        return new SourcedSection(source, raw == null ? new LinkedHashMap<>() : raw, null, "");
+    }
+
+    protected final @NotNull ConfigureSource<? extends SourcedSection, ?, ?> source;
+
+    public SourcedSection(@NotNull ConfigureSource<? extends SourcedSection, ?, ?> source,
+                          @NotNull Map<?, ?> raw, @Nullable SourcedSection parent, @NotNull String path) {
+        super(parent, path);
+        this.source = source;
+        migrate(raw);
+    }
+
+    public @NotNull ConfigureSource<? extends SourcedSection, ?, ?> source() {
+        return source;
+    }
+
+    @Override
+    public char pathSeparator() {
+        return source().pathSeparator();
+    }
+
+    @Override
+    public @NotNull SourcedSection self() {
+        return this;
+    }
+
+    @Override
+    public @NotNull SourcedSection createSection(@NotNull String path, @NotNull Map<?, ?> data) {
+        return new SourcedSection(source(), data, this, path);
+    }
+
+}

features/section/src/test/java/test/section/ShadeTest.java

@@ -0,0 +1,77 @@
+package test.section;
+
+import cc.carm.lib.configuration.source.section.ConfigureSection;
+import cc.carm.lib.configuration.source.section.MemorySection;
+import cc.carm.lib.configuration.source.section.ShadedSection;
+import org.junit.Test;
+
+import java.util.Arrays;
+import java.util.LinkedHashMap;
+import java.util.Map;
+
+/**
+ * @author Lyzen
+ * @date 21/2/2025 下午2:18
+ */
+public class ShadeTest {
+
+    @Test
+    public void test() {
+        ConfigureSection template = MemorySection.of(data -> {
+            data.put("name", "GentleMan");
+            data.put("age", 12);
+            data.put("gender", "male");
+            Map<String, Object> address = new LinkedHashMap<>();
+            address.put("Hotel", "Nanjing Road 101");
+            address.put("Store", "Beijing Road 404");
+            Map<String, Object> mapInside = new LinkedHashMap<>();
+            mapInside.put("InsideKeyExample", "InsideValueExample");
+            address.put("Inside", mapInside);
+            data.put("addresses", address);
+            data.put("cards", Arrays.asList("00000", "11111", "22222"));
+        });
+        ConfigureSection source = MemorySection.of(data -> {
+            data.put("age", 25);
+            Map<String, Object> address = new LinkedHashMap<>();
+            address.put("NewOne", "Guangdong Road 505");
+            data.put("addresses", address);
+            Map<String, Object> mapInside = new LinkedHashMap<>();
+            mapInside.put("AnotherInsideKey", "AnotherInsideValue");
+            address.put("Inside", mapInside);
+            data.put("cards", Arrays.asList("33333", "55555")); // 应当直接覆盖原先的List
+        });
+
+        ShadedSection root = new ShadedSection(null, template, source);
+        System.out.println("age: " + root.get("age"));
+        System.out.println("addresses: ");
+        for (Map.Entry<String, Object> entry : root.getSection("addresses").getValues(false).entrySet()) {
+            System.out.println("  " + entry.getKey() + ": " + entry.getValue());
+            if (entry.getValue() instanceof ConfigureSection) {
+                for (Map.Entry<String, Object> inner : ((ConfigureSection) entry.getValue()).getValues(false).entrySet()) {
+                    System.out.println("    " + inner.getKey() + ": " + inner.getValue());
+                }
+            }
+        }
+        System.out.println("cards: " + root.getList("cards"));
+
+        System.out.println("\n----------------------\n");
+        System.out.println("Deep Search Test");
+        System.out.println("addresses: ");
+        for (Map.Entry<String, Object> entry : root.getSection("addresses").getValues(true).entrySet()) {
+            System.out.println("  " + entry.getKey() + ": " + entry.getValue());
+        }
+
+        System.out.println("\n----------------------\n");
+
+        root.set("addresses", MemorySection.of(map -> {
+            map.put("Hotel", "Nanjing Road 101");
+            map.put("Store", "Beijing Road banned");
+
+        }));
+
+        for (Map.Entry<String, Object> entry : source.getValues(true).entrySet()) {
+            System.out.println("  " + entry.getKey() + ": " + entry.getValue());
+        }
+    }
+
+}

features/text/pom.xml

@@ -6,7 +6,7 @@
     <parent>
         <groupId>cc.carm.lib</groupId>
         <artifactId>easyconfiguration-parent</artifactId>
-        <version>4.0.1</version>
+        <version>4.0.8</version>
         <relativePath>../../pom.xml</relativePath>
     </parent>
     <properties>

features/versioned/pom.xml

@@ -6,7 +6,7 @@
     <parent>
         <groupId>cc.carm.lib</groupId>
         <artifactId>easyconfiguration-parent</artifactId>
-        <version>4.0.1</version>
+        <version>4.0.8</version>
         <relativePath>../../pom.xml</relativePath>
     </parent>
     <properties>

features/versioned/src/main/java/cc/carm/lib/configuration/annotation/ConfigVersion.java

@@ -1,6 +1,5 @@
 package cc.carm.lib.configuration.annotation;
 
-import org.jetbrains.annotations.NotNull;
 import org.jetbrains.annotations.Range;
 
 import java.lang.annotation.ElementType;
@@ -22,7 +21,7 @@ public @interface ConfigVersion {
      *
      * @return the version of the configuration field
      */
-    @Range(from = 0, to = Integer.MAX_VALUE)
+    @Range(from = 0, to = 65535)
     int value() default 0;
 
 }

features/versioned/src/main/java/cc/carm/lib/configuration/option/VersionedOptions.java

@@ -1,13 +0,0 @@
-package cc.carm.lib.configuration.option;
-
-import cc.carm.lib.configuration.source.option.ConfigurationOption;
-
-public interface VersionedOptions {
-
-    /**
-     * Whether to set newer defaults when a {@link cc.carm.lib.configuration.value.ConfigValue}'s marked version
-     * is newer than the current in storage.
-     */
-    ConfigurationOption<Boolean> RESET_NEWER_DEFAULTS = ConfigurationOption.of(true);
-
-}

features/versioned/src/main/java/cc/carm/lib/configuration/versioned/VersionedMetaTypes.java

@@ -1,4 +1,4 @@
-package cc.carm.lib.configuration.commentable;
+package cc.carm.lib.configuration.versioned;
 
 import cc.carm.lib.configuration.annotation.ConfigVersion;
 import cc.carm.lib.configuration.source.ConfigurationHolder;
@@ -19,7 +19,18 @@ public interface VersionedMetaTypes {
     }
 
     static void register(@NotNull ConfigurationInitializer initializer) {
-        initializer.registerFieldAnnotation(ConfigVersion.class, VERSION, ConfigVersion::value);
+        initializer.appendFieldInitializer((holder, path, field, value) -> {
+            ConfigVersion annotation = field.getAnnotation(ConfigVersion.class);
+            if (annotation == null || value == null) return;
+            int currentVersion = annotation.value();
+            int savedVersion = holder.metadata(path).get(VERSION, 0);
+            if (currentVersion == savedVersion) return;
+
+            if (currentVersion > savedVersion) { // This values updated.
+                value.setDefault(true); // Mark as default value, force write.
+            }
+            holder.metadata(path).set(VERSION, currentVersion);
+        });
     }
 
 }

pom.xml

@@ -15,7 +15,7 @@
     <groupId>cc.carm.lib</groupId>
     <artifactId>easyconfiguration-parent</artifactId>
     <packaging>pom</packaging>
-    <version>4.0.1</version>
+    <version>4.0.8</version>
     <modules>
         <module>core</module>
         <module>features/section</module>
@@ -27,14 +27,14 @@
         <module>providers/yaml</module>
         <module>providers/gson</module>
         <!--        <module>providers/hocon</module>-->
-        <!--        <module>providers/sql</module>-->
+        <module>providers/sql</module>
-        <!--        <module>providers/mongodb</module>-->
+        <module>providers/mongodb</module>
 
         <module>demo</module>
     </modules>
 
     <name>EasyConfiguration</name>
-    <description>轻松(做)配置，简单便捷的通用配置文件加载、读取与更新工具，可自定义配置格式。</description>
+    <description>A simple, easy-to-use and universal solution for managing configuration files.</description>
     <url>https://github.com/CarmJos/EasyConfiguration</url>
 
     <developers>
@@ -89,12 +89,6 @@
             <url>https://repo1.maven.org/maven2/</url>
         </repository>
 
-        <repository>
-            <id>github</id>
-            <name>GitHub Packages</name>
-            <url>https://maven.pkg.github.com/CarmJos/*</url>
-        </repository>
-
     </repositories>
 
     <distributionManagement>
@@ -202,7 +196,7 @@
                 <plugin>
                     <groupId>org.apache.maven.plugins</groupId>
                     <artifactId>maven-compiler-plugin</artifactId>
-                    <version>3.13.0</version>
+                    <version>3.14.0</version>
                     <configuration>
                         <source>${project.jdk.version}</source>
                         <target>${project.jdk.version}</target>

providers/gson/pom.xml

@@ -5,7 +5,7 @@
     <parent>
         <artifactId>easyconfiguration-parent</artifactId>
         <groupId>cc.carm.lib</groupId>
-        <version>4.0.1</version>
+        <version>4.0.8</version>
         <relativePath>../../pom.xml</relativePath>
     </parent>
     <modelVersion>4.0.0</modelVersion>

providers/gson/src/main/java/cc/carm/lib/configuration/source/json/JSONSource.java

@@ -2,7 +2,7 @@ package cc.carm.lib.configuration.source.json;
 
 import cc.carm.lib.configuration.source.ConfigurationHolder;
 import cc.carm.lib.configuration.source.file.FileConfigSource;
-import cc.carm.lib.configuration.source.section.MemorySection;
+import cc.carm.lib.configuration.source.section.SourcedSection;
 import com.google.gson.Gson;
 import com.google.gson.GsonBuilder;
 import com.google.gson.JsonSerializer;
@@ -14,17 +14,17 @@ import java.util.LinkedHashMap;
 import java.util.Map;
 import java.util.Objects;
 
-public class JSONSource extends FileConfigSource<MemorySection, Map<String, Object>, JSONSource> {
+public class JSONSource extends FileConfigSource<SourcedSection, Map<String, Object>, JSONSource> {
 
     public static final @NotNull Gson DEFAULT_GSON = new GsonBuilder()
             .serializeNulls().disableHtmlEscaping().setPrettyPrinting()
             .registerTypeAdapter(
-                    MemorySection.class,
+                    SourcedSection.class,
-                    (JsonSerializer<MemorySection>) (src, t, c) -> c.serialize(src.data())
+                    (JsonSerializer<SourcedSection>) (src, t, c) -> c.serialize(src.data())
             ).create();
 
     protected final @NotNull Gson gson;
-    protected @Nullable MemorySection rootSection;
+    protected @Nullable SourcedSection rootSection;
 
     protected JSONSource(@NotNull ConfigurationHolder<? extends JSONSource> holder,
                          @NotNull File file, @Nullable String resourcePath) {
@@ -48,7 +48,7 @@ public class JSONSource extends FileConfigSource<MemorySection, Map<String, Obje
     }
 
     @Override
-    protected JSONSource self() {
+    protected @NotNull JSONSource self() {
         return this;
     }
 
@@ -58,7 +58,7 @@ public class JSONSource extends FileConfigSource<MemorySection, Map<String, Obje
     }
 
     @Override
-    public @NotNull MemorySection section() {
+    public @NotNull SourcedSection section() {
         return Objects.requireNonNull(this.rootSection, "Root section is not initialized");
     }
 
@@ -70,7 +70,7 @@ public class JSONSource extends FileConfigSource<MemorySection, Map<String, Obje
     @Override
     protected void onReload() throws Exception {
         Map<?, ?> data = fileReader(reader -> gson.fromJson(reader, LinkedHashMap.class));
-        this.rootSection = MemorySection.root(this, data);
+        this.rootSection = SourcedSection.root(this, data);
         this.lastUpdateMillis = System.currentTimeMillis(); // 更新时间
     }
 

providers/mongodb/pom.xml

@@ -5,7 +5,7 @@
     <parent>
         <artifactId>easyconfiguration-parent</artifactId>
         <groupId>cc.carm.lib</groupId>
-        <version>4.0.0</version>
+        <version>4.0.8</version>
         <relativePath>../../pom.xml</relativePath>
     </parent>
     <modelVersion>4.0.0</modelVersion>
@@ -15,6 +15,7 @@
         <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
         <maven.compiler.encoding>UTF-8</maven.compiler.encoding>
 
+        <deps.mongodb.version>5.3.1</deps.mongodb.version>
         <log4j.version>2.24.3</log4j.version>
     </properties>
     <artifactId>easyconfiguration-mongodb</artifactId>
@@ -30,7 +31,7 @@
 
         <dependency>
             <groupId>${project.parent.groupId}</groupId>
-            <artifactId>easyconfiguration-gson</artifactId>
+            <artifactId>easyconfiguration-feature-section</artifactId>
             <version>${project.parent.version}</version>
             <scope>compile</scope>
         </dependency>
@@ -38,14 +39,7 @@
         <dependency>
             <groupId>org.mongodb</groupId>
             <artifactId>mongodb-driver-sync</artifactId>
-            <version>5.3.1</version>
+            <version>${deps.mongodb.version}</version>
-        </dependency>
-
-        <dependency>
-            <groupId>${project.parent.groupId}</groupId>
-            <artifactId>easyconfiguration-demo</artifactId>
-            <version>${project.parent.version}</version>
-            <scope>test</scope>
         </dependency>
 
         <dependency>
@@ -69,6 +63,20 @@
             <scope>test</scope>
         </dependency>
 
+        <dependency>
+            <groupId>${project.parent.groupId}</groupId>
+            <artifactId>easyconfiguration-demo</artifactId>
+            <version>${project.parent.version}</version>
+            <scope>test</scope>
+        </dependency>
+
+        <dependency>
+            <groupId>${project.parent.groupId}</groupId>
+            <artifactId>easyconfiguration-gson</artifactId>
+            <version>${project.parent.version}</version>
+            <scope>test</scope>
+        </dependency>
+
     </dependencies>
 
     <build>

providers/mongodb/src/main/java/cc/carm/lib/configuration/source/mongodb/MongoConfigFactory.java

@@ -0,0 +1,75 @@
+package cc.carm.lib.configuration.source.mongodb;
+
+import cc.carm.lib.configuration.source.ConfigurationFactory;
+import cc.carm.lib.configuration.source.ConfigurationHolder;
+import com.mongodb.client.MongoCollection;
+import com.mongodb.client.MongoDatabase;
+import org.bson.Document;
+import org.jetbrains.annotations.NotNull;
+
+import java.util.function.Supplier;
+
+public class MongoConfigFactory extends ConfigurationFactory<MongoSource, ConfigurationHolder<MongoSource>, MongoConfigFactory> {
+
+    public static MongoConfigFactory from(@NotNull Supplier<MongoCollection<Document>> collectionSupplier) {
+        return new MongoConfigFactory(collectionSupplier);
+    }
+
+    public static MongoConfigFactory from(@NotNull MongoCollection<Document> collection) {
+        return from(() -> collection);
+    }
+
+    public static MongoConfigFactory from(@NotNull MongoDatabase database, @NotNull String collectionName) {
+        return from(() -> database.getCollection(collectionName));
+    }
+
+    protected @NotNull Supplier<MongoCollection<Document>> collectionSupplier;
+    protected @NotNull String namespace = "config";
+
+    public MongoConfigFactory(@NotNull Supplier<MongoCollection<Document>> collectionSupplier) {
+        super();
+        this.collectionSupplier = collectionSupplier;
+    }
+
+    public MongoConfigFactory collection(@NotNull Supplier<MongoCollection<Document>> collectionSupplier) {
+        this.collectionSupplier = collectionSupplier;
+        return this;
+    }
+
+    public MongoConfigFactory collection(@NotNull MongoCollection<Document> collection) {
+        return collection(() -> collection);
+    }
+
+    public MongoConfigFactory namespace(@NotNull String namespace) {
+        this.namespace = namespace;
+        return this;
+    }
+
+    public MongoConfigFactory namespace(@NotNull Supplier<String> namespace) {
+        return namespace(namespace.get());
+    }
+
+
+    @Override
+    protected MongoConfigFactory self() {
+        return this;
+    }
+
+    @Override
+    public @NotNull ConfigurationHolder<MongoSource> build() {
+        MongoCollection<Document> collection = this.collectionSupplier.get();
+        if (collection == null) {
+            throw new IllegalStateException("Failed to get MongoCollection<Document> from supplier");
+        }
+
+        return new ConfigurationHolder<MongoSource>(this.adapters, this.options, this.metadata, this.initializer) {
+            final @NotNull MongoSource source = new MongoSource(this, System.currentTimeMillis(), collection, namespace);
+
+            @Override
+            public @NotNull MongoSource config() {
+                return this.source;
+            }
+        };
+    }
+
+}

providers/mongodb/src/main/java/cc/carm/lib/configuration/source/mongodb/MongoSource.java

@@ -1,4 +1,76 @@
 package cc.carm.lib.configuration.source.mongodb;
 
-public class MongoSource {
+import cc.carm.lib.configuration.source.ConfigurationHolder;
+import cc.carm.lib.configuration.source.section.ConfigureSource;
+import cc.carm.lib.configuration.source.section.SourcedSection;
+import com.mongodb.client.MongoCollection;
+import com.mongodb.client.model.ReplaceOptions;
+import org.bson.Document;
+import org.jetbrains.annotations.NotNull;
+
+import java.util.Map;
+import java.util.Objects;
+
+public class MongoSource extends ConfigureSource<SourcedSection, Map<String, Object>, MongoSource> {
+
+    protected final @NotNull MongoCollection<Document> collection;
+    protected final @NotNull String namespace;
+
+    protected SourcedSection rootSection;
+
+    protected MongoSource(@NotNull ConfigurationHolder<? extends MongoSource> holder, long lastUpdateMillis,
+                          @NotNull MongoCollection<Document> collection, @NotNull String namespace) {
+        super(holder, lastUpdateMillis);
+        this.collection = collection;
+        this.namespace = namespace;
+        try {
+            onReload();
+        } catch (Exception e) {
+            e.printStackTrace();
+        }
+    }
+
+    @Override
+    protected @NotNull MongoSource self() {
+        return this;
+    }
+
+    @Override
+    public @NotNull Map<String, Object> original() {
+        return section().data();
+    }
+
+    @Override
+    public @NotNull SourcedSection section() {
+        return Objects.requireNonNull(rootSection, "RootSection is not initialized");
+    }
+
+    public @NotNull String namespace() {
+        return this.namespace;
+    }
+
+    public @NotNull MongoCollection<Document> collection() {
+        return this.collection;
+    }
+
+    @Override
+    public void save() throws Exception {
+        Map<String, Object> data = this.rootSection.rawMap();
+        if (data.isEmpty()) return; // Skip saving if empty
+        if (data.containsKey("_id") && data.size() == 1) return; // Skip saving if only contains _id
+
+        ReplaceOptions options = new ReplaceOptions().upsert(true);
+        Document storage = new Document(data).append("_id", this.namespace);
+        this.collection.replaceOne(new Document("_id", this.namespace), storage, options);
+    }
+
+    @Override
+    protected void onReload() throws Exception {
+        Document storage = this.collection.find(new Document("_id", this.namespace)).first();
+        if (storage == null) storage = new Document();
+        else storage.remove("_id"); // Remove _id
+        this.rootSection = SourcedSection.root(this, storage);
+    }
+
+
 }

providers/mongodb/src/test/java/config/MongoConfig.java

@@ -0,0 +1,12 @@
+package config;
+
+import cc.carm.lib.configuration.Configuration;
+import cc.carm.lib.configuration.value.standard.ConfiguredValue;
+
+interface MongoConfig extends Configuration {
+    ConfiguredValue<String> HOST = ConfiguredValue.of("127.0.0.1");
+    ConfiguredValue<Integer> PORT = ConfiguredValue.of(27017);
+    ConfiguredValue<String> USERNAME = ConfiguredValue.of("minecraft");
+    ConfiguredValue<String> PASSWORD = ConfiguredValue.of("minecraft");
+    ConfiguredValue<String> DATABASE = ConfiguredValue.of("minecraft");
+}

providers/mongodb/src/test/java/config/MongoTest.java

@@ -0,0 +1,57 @@
+package config;
+
+import cc.carm.lib.configuration.demo.tests.ConfigurationTest;
+import cc.carm.lib.configuration.source.ConfigurationHolder;
+import cc.carm.lib.configuration.source.json.JSONConfigFactory;
+import cc.carm.lib.configuration.source.mongodb.MongoConfigFactory;
+import com.mongodb.ConnectionString;
+import com.mongodb.MongoClientSettings;
+import com.mongodb.MongoCredential;
+import com.mongodb.client.MongoClient;
+import com.mongodb.client.MongoClients;
+import com.mongodb.client.MongoDatabase;
+import org.bson.UuidRepresentation;
+import org.junit.Test;
+
+import java.io.File;
+
+public class MongoTest {
+
+    boolean local = false;
+
+    @Test
+    public void test() {
+
+        if (!local) return;
+
+        ConfigurationHolder<?> gsonHolder = JSONConfigFactory.from(new File("target/mongo.json")).build();
+        gsonHolder.initialize(MongoConfig.class);
+
+        MongoClientSettings settings = MongoClientSettings.builder()
+                .applyConnectionString(new ConnectionString(
+                        "mongodb://" + MongoConfig.HOST.resolve() + ":" + MongoConfig.PORT.resolve()
+                ))
+                .credential(MongoCredential.createCredential(
+                        MongoConfig.USERNAME.resolve(), MongoConfig.DATABASE.resolve(),
+                        MongoConfig.PASSWORD.resolve().toCharArray()
+                ))
+                .uuidRepresentation(UuidRepresentation.STANDARD)
+                .build();
+        MongoClient mongoClient = MongoClients.create(settings);
+        MongoDatabase mongoDatabase = mongoClient.getDatabase(MongoConfig.DATABASE.resolve());
+
+        ConfigurationHolder<?> mongoHolder = MongoConfigFactory
+                .from(mongoDatabase, "configs")
+                .namespace("my_plugin")
+                .build();
+
+        // Test the configuration
+        ConfigurationTest.testDemo(mongoHolder);
+        ConfigurationTest.testInner(mongoHolder);
+
+        ConfigurationTest.save(mongoHolder);
+
+    }
+
+
+}

providers/sql/README.md

@@ -6,16 +6,16 @@ SQL database implementation, support for MySQL or MariaDB.
 ```mysql
 CREATE TABLE IF NOT EXISTS conf
 (
-    `namespace`      VARCHAR(32)      NOT NULL,                           # 命名空间 (代表其属于谁，类似于单个配置文件地址的概念)
+    `namespace`      VARCHAR(32)        NOT NULL,                           # 命名空间 (代表其属于谁，类似于单个配置文件地址的概念)
-    `path`           VARCHAR(96)      NOT NULL,                           # 配置路径 (ConfigPath)
+    `path`           VARCHAR(96)        NOT NULL,                           # 配置路径 (ConfigPath)
-    `type`           TINYINT UNSIGNED NOT NULL DEFAULT 0,                 # 数据类型 (Integer/Byte/List/Map/...)
+    `type`           TINYINT UNSIGNED   NOT NULL DEFAULT 0,                 # 数据类型 (Integer/Byte/List/Map/...)
-    `value`          MEDIUMTEXT,                                          # 配置项的值 (可能为JSON格式)
+    `value`          MEDIUMTEXT,                                            # 配置项的值 (可能为JSON格式)
-    `inline_comment` TEXT,                                                # 配置项的用法，本质是行内注释
+    `inline_comment` TEXT comment 'usage',                                  # 配置项的用法，本质是行内注释
-    `header_comment` MEDIUMTEXT,                                          # 配置项的描述，本质是顶部注释
+    `header_comment` MEDIUMTEXT comment 'description',                      # 配置项的描述，本质是顶部注释
-    `footer_comment` MEDIUMTEXT,                                          # 配置项的描述，本质是顶部注释
+    `footer_comment` MEDIUMTEXT comment 'example',                          # 配置项的参考，本质是底部注释
-    `version`        INT UNSIGNED     NOT NULL DEFAULT 0,                 # 配置项的版本
+    `version`        MEDIUMINT UNSIGNED NOT NULL DEFAULT 0,                 # 配置项的版本
-    `create_time`    DATETIME         NOT NULL DEFAULT CURRENT_TIMESTAMP, # 创建时间
+    `create_time`    DATETIME           NOT NULL DEFAULT CURRENT_TIMESTAMP, # 创建时间
-    `update_time`    DATETIME         NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
+    `update_time`    DATETIME           NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
     PRIMARY KEY (`namespace`, `path`)
 ) ENGINE = InnoDB
   DEFAULT CHARSET = utf8mb4;

providers/sql/pom.xml

@@ -6,7 +6,7 @@
     <parent>
         <artifactId>easyconfiguration-parent</artifactId>
         <groupId>cc.carm.lib</groupId>
-        <version>4.0.0</version>
+        <version>4.0.8</version>
         <relativePath>../../pom.xml</relativePath>
     </parent>
     <properties>
@@ -15,7 +15,8 @@
         <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
         <maven.compiler.encoding>UTF-8</maven.compiler.encoding>
 
-        <log4j.version>2.24.3</log4j.version>
+        <deps.mysql-driver.version>8.0.33</deps.mysql-driver.version>
+        <deps.log4j.version>2.24.3</deps.log4j.version>
     </properties>
     <artifactId>easyconfiguration-sql</artifactId>
 
@@ -77,21 +78,35 @@
         <dependency>
             <groupId>org.apache.logging.log4j</groupId>
             <artifactId>log4j-api</artifactId>
-            <version>${log4j.version}</version>
+            <version>${deps.log4j.version}</version>
             <scope>test</scope>
         </dependency>
 
         <dependency>
             <groupId>org.apache.logging.log4j</groupId>
             <artifactId>log4j-core</artifactId>
-            <version>${log4j.version}</version>
+            <version>${deps.log4j.version}</version>
             <scope>test</scope>
         </dependency>
 
         <dependency>
             <groupId>org.apache.logging.log4j</groupId>
             <artifactId>log4j-slf4j-impl</artifactId>
-            <version>${log4j.version}</version>
+            <version>${deps.log4j.version}</version>
+            <scope>test</scope>
+        </dependency>
+
+        <dependency>
+            <groupId>${project.parent.groupId}</groupId>
+            <artifactId>easyconfiguration-gson</artifactId>
+            <version>${project.parent.version}</version>
+            <scope>test</scope>
+        </dependency>
+
+        <dependency>
+            <groupId>mysql</groupId>
+            <artifactId>mysql-connector-java</artifactId>
+            <version>${deps.mysql-driver.version}</version>
             <scope>test</scope>
         </dependency>
 

providers/sql/src/main/java/cc/carm/lib/configuration/source/sql/SQLConfigFactory.java

@@ -0,0 +1,133 @@
+package cc.carm.lib.configuration.source.sql;
+
+import cc.carm.lib.configuration.adapter.ValueType;
+import cc.carm.lib.configuration.commentable.Commentable;
+import cc.carm.lib.configuration.function.DataFunction;
+import cc.carm.lib.configuration.source.ConfigurationFactory;
+import cc.carm.lib.configuration.source.ConfigurationHolder;
+import cc.carm.lib.configuration.versioned.VersionedMetaTypes;
+import cc.carm.lib.easysql.api.SQLManager;
+import com.google.gson.Gson;
+import com.google.gson.GsonBuilder;
+import org.jetbrains.annotations.NotNull;
+import org.jetbrains.annotations.Range;
+
+import java.util.HashMap;
+import java.util.function.Consumer;
+import java.util.function.Supplier;
+
+public class SQLConfigFactory extends ConfigurationFactory<SQLSource, ConfigurationHolder<SQLSource>, SQLConfigFactory> {
+
+    public static SQLConfigFactory from(@NotNull Supplier<@NotNull SQLManager> managerSupplier) {
+        return new SQLConfigFactory(managerSupplier);
+    }
+
+    public static SQLConfigFactory from(@NotNull SQLManager manager) {
+        return from(() -> manager);
+    }
+
+    protected @NotNull Supplier<SQLManager> managerSupplier;
+    protected Supplier<Gson> gsonSupplier = () -> SQLSource.DEFAULT_GSON;
+
+    protected HashMap<Integer, SQLValueResolver<?>> resolvers = new HashMap<>(SQLValueResolver.STANDARD_RESOLVERS);
+    protected String tableName = "configs";
+    protected String namespace = "default";
+
+    public SQLConfigFactory(@NotNull Supplier<SQLManager> managerSupplier) {
+        this.managerSupplier = managerSupplier;
+    }
+
+    @Override
+    protected SQLConfigFactory self() {
+        return this;
+    }
+
+    public SQLConfigFactory manager(@NotNull Supplier<SQLManager> managerSupplier) {
+        this.managerSupplier = managerSupplier;
+        return self();
+    }
+
+    public SQLConfigFactory manager(@NotNull SQLManager manager) {
+        return manager(() -> manager);
+    }
+
+    public SQLConfigFactory gson(@NotNull Supplier<Gson> gsonSupplier) {
+        this.gsonSupplier = gsonSupplier;
+        return self();
+    }
+
+    public SQLConfigFactory gson(@NotNull Consumer<GsonBuilder> builder) {
+        return gson(() -> {
+            GsonBuilder gsonBuilder = new GsonBuilder();
+            builder.accept(gsonBuilder);
+            return gsonBuilder.create();
+        });
+    }
+
+    public SQLConfigFactory gson(@NotNull Gson gson) {
+        return gson(() -> gson);
+    }
+
+    public SQLConfigFactory resolver(@Range(from = 0, to = 255) int type, @NotNull SQLValueResolver<?> resolver) {
+        this.resolvers.put(type, resolver);
+        return self();
+    }
+
+    public <T> SQLConfigFactory resolver(@Range(from = 0, to = 255) int id, @NotNull Class<T> clazz,
+                                         @NotNull DataFunction<String, T> parser) {
+        return resolver(id, ValueType.of(clazz), parser);
+    }
+
+    public <T> SQLConfigFactory resolver(@Range(from = 0, to = 255) int id, @NotNull ValueType<T> type,
+                                         @NotNull DataFunction<String, T> parser) {
+        return resolver(id, SQLValueResolver.of(type, parser));
+    }
+
+    public <T> SQLConfigFactory resolver(@Range(from = 0, to = 255) int id, @NotNull Class<T> clazz,
+                                         @NotNull DataFunction<String, T> parser,
+                                         @NotNull DataFunction<T, String> serializer) {
+        return resolver(id, ValueType.of(clazz), parser, serializer);
+    }
+
+    public <T> SQLConfigFactory resolver(@Range(from = 0, to = 255) int id, @NotNull ValueType<T> type,
+                                         @NotNull DataFunction<String, T> parser,
+                                         @NotNull DataFunction<T, String> serializer) {
+        return resolver(id, SQLValueResolver.of(type, parser, serializer));
+    }
+
+    public SQLConfigFactory tableName(@NotNull String tableName) {
+        this.tableName = tableName;
+        return self();
+    }
+
+    public SQLConfigFactory namespace(@NotNull String namespace) {
+        this.namespace = namespace;
+        return self();
+    }
+
+    @Override
+    public @NotNull ConfigurationHolder<SQLSource> build() {
+        Gson gson = gsonSupplier.get();
+        if (gson == null) throw new NullPointerException("No Gson instance provided.");
+
+        SQLManager manager = this.managerSupplier.get();
+        if (manager == null) throw new NullPointerException("No SQLManager instance provided.");
+
+        Commentable.registerMeta(this.initializer);
+        VersionedMetaTypes.register(this.initializer);
+
+        return new ConfigurationHolder<SQLSource>(this.adapters, this.options, this.metadata, this.initializer) {
+            final SQLSource source = new SQLSource(
+                    this, System.currentTimeMillis(),
+                    gson, manager, resolvers, tableName, namespace
+            );
+
+            @Override
+            public @NotNull SQLSource config() {
+                return source;
+            }
+        };
+    }
+
+
+}

providers/sql/src/main/java/cc/carm/lib/configuration/source/sql/SQLOptions.java

@@ -1,6 +1,12 @@
 package cc.carm.lib.configuration.source.sql;
 
+import cc.carm.lib.configuration.source.option.ConfigurationOption;
+
 public interface SQLOptions {
 
+    /**
+     * Whether to purge the configuration's in-database data when saving.
+     */
+    ConfigurationOption<Boolean> PURGE = ConfigurationOption.of( true);
 
 }

providers/sql/src/main/java/cc/carm/lib/configuration/source/sql/SQLSource.java

@@ -1,53 +1,62 @@
 package cc.carm.lib.configuration.source.sql;
 
+import cc.carm.lib.configuration.commentable.Commentable;
 import cc.carm.lib.configuration.source.ConfigurationHolder;
 import cc.carm.lib.configuration.source.section.ConfigureSource;
-import cc.carm.lib.configuration.source.section.MemorySection;
+import cc.carm.lib.configuration.source.section.SourcedSection;
+import cc.carm.lib.configuration.value.ConfigValue;
+import cc.carm.lib.configuration.versioned.VersionedMetaTypes;
 import cc.carm.lib.easysql.api.SQLManager;
+import cc.carm.lib.easysql.api.SQLQuery;
 import cc.carm.lib.easysql.api.SQLTable;
 import cc.carm.lib.easysql.api.enums.IndexType;
 import com.google.gson.Gson;
 import com.google.gson.GsonBuilder;
 import org.jetbrains.annotations.NotNull;
+import org.jetbrains.annotations.Nullable;
 
+import java.sql.ResultSet;
+import java.time.LocalDateTime;
 import java.util.*;
 
-public class SQLSource extends ConfigureSource<MemorySection, Map<?, ?>, SQLSource> {
+public class SQLSource extends ConfigureSource<SourcedSection, Map<String, Object>, SQLSource> {
 
     protected static final @NotNull Gson DEFAULT_GSON = new GsonBuilder()
-            .serializeNulls().disableHtmlEscaping().setPrettyPrinting()
+            .serializeNulls().disableHtmlEscaping().create();
-            .create();
 
     protected final @NotNull Gson gson;
     protected final @NotNull SQLManager sqlManager;
     protected final @NotNull String namespace;
     protected final @NotNull SQLTable table;
 
-    protected final @NotNull Set<String> updated = new HashSet<>();
+    protected final @NotNull Map<Integer, SQLValueResolver<?>> resolvers;
-    protected MemorySection rootSection;
+    protected SourcedSection rootSection;
 
     public SQLSource(@NotNull ConfigurationHolder<? extends SQLSource> holder, long lastUpdateMillis,
-                     @NotNull Gson gson, @NotNull SQLManager sqlManager, @NotNull String tableName, @NotNull String namespace) {
+                     @NotNull Gson gson, @NotNull SQLManager sqlManager,
+                     @NotNull Map<Integer, SQLValueResolver<?>> resolvers,
+                     @NotNull String tableName, @NotNull String namespace) {
         super(holder, lastUpdateMillis);
         this.gson = gson;
         this.sqlManager = sqlManager;
+        this.resolvers = resolvers;
         this.namespace = namespace;
         this.table = SQLTable.of(tableName, builder -> {
 
             builder.addColumn("namespace", "VARCHAR(32) NOT NULL");
             builder.addColumn("path", "VARCHAR(96) NOT NULL");
 
-            builder.addColumn("type", "TINYINT NOT NULL DEFAULT 0");
             builder.addColumn("value", "TEXT");
 
             builder.addColumn("inline_comment", "TEXT");
             builder.addColumn("header_comments", "MEDIUMTEXT");
             builder.addColumn("footer_comments", "MEDIUMTEXT");
 
+            builder.addColumn("type", "TINYINT NOT NULL DEFAULT 0");
             builder.addColumn("version", "MEDIUMINT UNSIGNED NOT NULL DEFAULT 0");
 
-            builder.addColumn("create_time", "TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP");
+            builder.addColumn("create_time", "TIMESTAMP NOT NULL");
-            builder.addColumn("update_time", "TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP");
+            builder.addColumn("update_time", "TIMESTAMP NOT NULL");
 
             builder.setIndex(
                     IndexType.PRIMARY_KEY, "pk_" + tableName.toLowerCase(),
@@ -55,82 +64,134 @@ public class SQLSource extends ConfigureSource<MemorySection, Map<?, ?>, SQLSour
             );
             builder.setTableSettings("ENGINE=InnoDB DEFAULT CHARSET=utf8mb4");
         });
+
+        try {
+            this.table.create(this.sqlManager);
+            onReload();
+        } catch (Exception e) {
+            e.printStackTrace();
+        }
     }
 
     @Override
-    protected SQLSource self() {
+    protected @NotNull SQLSource self() {
         return this;
     }
 
+    public @NotNull Gson gson() {
+        return gson;
+    }
+
     @Override
-    public @NotNull Map<?, ?> original() {
+    public @NotNull Map<String, Object> original() {
         return section().data();
     }
 
     @Override
-    public @NotNull MemorySection section() {
+    public @NotNull SourcedSection section() {
         return Objects.requireNonNull(this.rootSection, "Root section is not initialized.");
     }
 
+    public int purge() throws Exception {
+        return this.table.createDelete().addCondition("namespace", namespace).build().execute();
+    }
+
     @Override
     public void save() throws Exception {
-        if (this.updated.isEmpty()) return; // Nothing to save
+        LocalDateTime time = LocalDateTime.now(); // Update time
+        List<Object[]> dataValues = new ArrayList<>();
 
-        Date date = new Date(); // Update time
+        SourcedSection section = section();
-        List<Object[]> values = new ArrayList<>();
+        Map<String, ConfigValue<?>> values = holder().registeredValues();
+        for (Map.Entry<String, ConfigValue<?>> entry : values.entrySet()) {
+            @NotNull String path = entry.getKey();
+            @NotNull ConfigValue<?> config = entry.getValue();
+            @Nullable Object value = section.get(path);
 
-        for (String path : this.updated) {
+            if (value instanceof SourcedSection) {
-            Object value = get(path);
+                value = ((SourcedSection) value).rawMap();
+            } else if (value instanceof List<?>) {
+                List<Object> list = new ArrayList<>();
+                for (Object obj : (List<?>) value) {
+                    if (obj instanceof SourcedSection) {
+                        list.add(((SourcedSection) obj).rawMap());
+                    } else {
+                        list.add(obj);
+                    }
+                }
+                value = list;
+            }
 
-//            if (value instanceof SQLConfigWrapper) {
+            if (value == null) continue;
-//                value = getSourceMap(((SQLConfigWrapper) value).getSource());
+
-//            }
+            try {
-//
+                int typeID = typeIdOf(value);
-//            SQLValueResolver<?> type = SQLValueTypes.get(value.getClass());
+                String data = serialize(typeID, value);
-//            if (type != null) {
+                if (data == null) continue;
-//                values.add(new Object[]{
+
-//                        this.namespace, path, date,
+                int version = holder().metadata(path).get(VersionedMetaTypes.VERSION, 0);
-//                        type.getID(), type.serializeObject(value),
+                dataValues.add(new Object[]{
-//                        getComments().getInlineComment(path),
+                        namespace, path, time, version, typeID, data,
-//                        GSON.toJson(getComments().getHeaderComment(path))
+                        Commentable.getInlineComment(holder(), path),
-//                });
+                        gson.toJson(Commentable.getHeaderComments(holder(), path)),
-//            }
+                        gson.toJson(Commentable.getFooterComments(holder(), path))
+                });
+            } catch (Exception ex) {
+                ex.printStackTrace();
+            }
         }
 
-        this.updated.clear();
+        if (holder.option(SQLOptions.PURGE)) {
-
+            purge();
+        }
         this.table.createReplaceBatch()
-                .setColumnNames("namespace", "path", "update_time", "type", "value", "inline_comment", "header_comments")
+                .setColumnNames(
-                .setAllParams(values)
+                        "namespace", "path", "update_time", "version", "type", "value",
-                .execute();
+                        "inline_comment", "header_comments", "footer_comments"
+                ).setAllParams(dataValues).execute();
     }
 
     @Override
     protected void onReload() throws Exception {
-        LinkedHashMap<String, Object> values = new LinkedHashMap<>();
+        Map<String, Object> loaded = new LinkedHashMap<>();
-
+        try (SQLQuery query = this.table.createQuery()
-//        try (SQLQuery query = this.table.createQuery()
+                .addCondition("namespace", namespace)
-//                .addCondition("namespace", namespace)
+                .build().execute()) {
-//                .build().execute()) {
+            ResultSet rs = query.getResultSet();
-//            ResultSet rs = query.getResultSet();
+            while (rs.next()) {
-//            while (rs.next()) {
+                String path = rs.getString("path");
-//                String path = rs.getString("path");
+                if (path == null) continue; // Path should be not null
-//                int type = rs.getInt("type");
+                int ver = rs.getInt("version");
-//                try {
+                try {
-//                    SQLValueResolver<?> resolver = SQLValueTypes.get(type);
+                    loaded.put(path, parse(rs.getInt("type"), rs.getString("value")));
-//                    if (resolver == null) throw new IllegalStateException("No resolver for type #" + type);
+                    if (ver != 0) holder().metadata(path).set(VersionedMetaTypes.VERSION, ver);
-//                    String value = rs.getString("value");
+                } catch (Exception e) {
-//                    values.put(path, resolver.resolve(value));
+                    e.printStackTrace();
-//
+                }
-//                    loadInlineComment(path, rs.getString("inline_comment"));
+            }
-//                    loadHeaderComment(path, rs.getString("header_comments"));
+        }
-//                } catch (Exception ex) {
+        this.rootSection = SourcedSection.root(this, loaded);
-//                    ex.printStackTrace();
-//                }
-//            }
-//        }
-//
-//        this.rootConfiguration = new SQLConfigWrapper(this, values);
     }
 
+
+    protected @Nullable Object parse(int type, String value) throws Exception {
+        SQLValueResolver<?> function = this.resolvers.get(type);
+        if (function == null) throw new IllegalStateException("No resolvers for type #" + type);
+        return function.resolve(this, value);
+    }
+
+    protected @Nullable String serialize(int type, @NotNull Object value) throws Exception {
+        SQLValueResolver<?> function = this.resolvers.get(type);
+        if (function == null) throw new IllegalStateException("No resolvers for type #" + type);
+        return function.serialize(this, value);
+    }
+
+    protected int typeIdOf(@NotNull Object value) {
+        return this.resolvers.entrySet().stream()
+                .filter(entry -> entry.getValue().isInstance(value))
+                .findFirst().map(Map.Entry::getKey)
+                .orElseThrow(() -> new IllegalStateException("No resolvers for value " + value.getClass().getName()));
+    }
+
+
 }

providers/sql/src/main/java/cc/carm/lib/configuration/source/sql/SQLValueResolver.java

@@ -0,0 +1,115 @@
+package cc.carm.lib.configuration.source.sql;
+
+import cc.carm.lib.configuration.adapter.ValueType;
+import cc.carm.lib.configuration.function.DataFunction;
+import org.jetbrains.annotations.NotNull;
+import org.jetbrains.annotations.Nullable;
+
+import java.util.Collections;
+import java.util.LinkedHashMap;
+import java.util.List;
+import java.util.Map;
+
+public abstract class SQLValueResolver<T> {
+
+    public static final @NotNull SQLValueResolver<String> STRING = SQLValueResolver.of(ValueType.STRING, s -> s);
+    public static final @NotNull SQLValueResolver<Byte> BYTE = SQLValueResolver.of(ValueType.BYTE, Byte::parseByte);
+    public static final @NotNull SQLValueResolver<Short> SHORT = SQLValueResolver.of(ValueType.SHORT, Short::parseShort);
+    public static final @NotNull SQLValueResolver<Integer> INTEGER = SQLValueResolver.of(ValueType.INTEGER, Integer::parseInt);
+    public static final @NotNull SQLValueResolver<Long> LONG = SQLValueResolver.of(ValueType.LONG, Long::parseLong);
+    public static final @NotNull SQLValueResolver<Float> FLOAT = SQLValueResolver.of(ValueType.FLOAT, Float::parseFloat);
+    public static final @NotNull SQLValueResolver<Double> DOUBLE = SQLValueResolver.of(ValueType.DOUBLE, Double::parseDouble);
+    public static final @NotNull SQLValueResolver<Boolean> BOOLEAN = SQLValueResolver.of(ValueType.BOOLEAN, Boolean::parseBoolean);
+    public static final @NotNull SQLValueResolver<Character> CHAR = SQLValueResolver.of(ValueType.CHAR, s -> s.charAt(0));
+
+    public static final @NotNull SQLValueResolver<List<?>> LIST = new SQLValueResolver<List<?>>(new ValueType<List<?>>() {
+    }) {
+        @Override
+        public @Nullable List<?> resolve(@NotNull SQLSource source, String data) throws Exception {
+            return source.gson().fromJson(data, List.class);
+        }
+
+        @Override
+        public @Nullable String serialize(@NotNull SQLSource source, Object value) {
+            return source.gson().toJson(value);
+        }
+    };
+
+    public static final @NotNull SQLValueResolver<Map<?, ?>> MAP = new SQLValueResolver<Map<?, ?>>(new ValueType<Map<?, ?>>() {
+    }) {
+        @Override
+        public @Nullable Map<?, ?> resolve(@NotNull SQLSource source, String data) throws Exception {
+            return source.gson().fromJson(data, LinkedHashMap.class);
+        }
+
+        @Override
+        public @Nullable String serialize(@NotNull SQLSource source, Object value) {
+            return source.gson().toJson(value);
+        }
+    };
+
+    public static final @NotNull Map<Integer, SQLValueResolver<?>> STANDARD_RESOLVERS = Collections.unmodifiableMap(standards());
+
+    static Map<Integer, SQLValueResolver<?>> standards() {
+        Map<Integer, SQLValueResolver<?>> map = new LinkedHashMap<>();
+        map.put(0, STRING);
+        map.put(1, BYTE);
+        map.put(2, SHORT);
+        map.put(3, INTEGER);
+        map.put(4, LONG);
+        map.put(5, FLOAT);
+        map.put(6, DOUBLE);
+        map.put(7, BOOLEAN);
+        map.put(8, CHAR);
+        map.put(10, LIST);
+        map.put(11, MAP);
+        return map;
+    }
+
+    public static <V> SQLValueResolver<V> of(@NotNull ValueType<V> type, @NotNull DataFunction<String, V> resolver) {
+        return new SQLValueResolver<V>(type) {
+            @Override
+            public @NotNull V resolve(@NotNull SQLSource source, String data) throws Exception {
+                return resolver.handle(data);
+            }
+        };
+    }
+
+    public static <V> SQLValueResolver<V> of(@NotNull ValueType<V> type,
+                                             @NotNull DataFunction<String, V> resolver,
+                                             @NotNull DataFunction<V, String> serializer) {
+        return new SQLValueResolver<V>(type) {
+            @Override
+            public @NotNull V resolve(@NotNull SQLSource source, String data) throws Exception {
+                return resolver.handle(data);
+            }
+
+            @Override
+            public @NotNull String serialize(@NotNull SQLSource source, Object value) throws Exception {
+                return serializer.handle(type.cast(value));
+            }
+        };
+    }
+
+
+    protected final @NotNull ValueType<T> type;
+
+    protected SQLValueResolver(@NotNull ValueType<T> type) {
+        this.type = type;
+    }
+
+    public @NotNull ValueType<T> getType() {
+        return type;
+    }
+
+    public boolean isInstance(@NotNull Object obj) {
+        return getType().isInstance(obj);
+    }
+
+    public abstract @Nullable T resolve(@NotNull SQLSource source, String data) throws Exception;
+
+    public @Nullable String serialize(@NotNull SQLSource source, Object value) throws Exception {
+        return String.valueOf(value);
+    }
+
+}

providers/sql/src/test/java/config/SQLConfigTest.java

@@ -1,27 +1,48 @@
 package config;
 
+import cc.carm.lib.configuration.demo.DatabaseConfiguration;
+import cc.carm.lib.configuration.demo.tests.ConfigurationTest;
+import cc.carm.lib.configuration.source.ConfigurationHolder;
+import cc.carm.lib.configuration.source.json.JSONConfigFactory;
+import cc.carm.lib.configuration.source.sql.SQLConfigFactory;
 import cc.carm.lib.easysql.EasySQL;
 import cc.carm.lib.easysql.api.SQLManager;
 import cc.carm.lib.easysql.beecp.BeeDataSourceConfig;
+import org.junit.Test;
+
+import java.io.File;
 
 public class SQLConfigTest {
 
+    boolean local = false;
 
+    @Test
     public void test() {
+        if (!local) return;
+
+        ConfigurationHolder<?> gsonHolder = JSONConfigFactory.from(new File("target/sql.json")).build();
+        gsonHolder.initialize(DatabaseConfiguration.class);
+
         BeeDataSourceConfig config = new BeeDataSourceConfig();
-        config.setDriverClassName("org.h2.Driver");
+        config.setDriverClassName(DatabaseConfiguration.DRIVER_NAME.resolve());
-        config.setJdbcUrl("jdbc:h2:file:target/test;DB_CLOSE_DELAY=-1;MODE=MySQL;");
+        config.setJdbcUrl(DatabaseConfiguration.buildJDBC());
+        config.setUsername(DatabaseConfiguration.USERNAME.resolve());
+        config.setPassword(DatabaseConfiguration.PASSWORD.resolve());
+
         SQLManager manager = EasySQL.createManager(config);
         manager.setDebugMode(true);
 
-//        SQLConfigProvider provider = EasyConfiguration.from(manager, "conf_test", "TESTING");
+        ConfigurationHolder<?> holder = SQLConfigFactory.from(manager)
-//
+                .tableName("test_configs")
-//        ConfigurationTest.testDemo(provider);
+                .namespace("testing")
-//        ConfigurationTest.testInner(provider);
+                .build();
-//
+
-//        ConfigurationTest.save(provider);
+        ConfigurationTest.testDemo(holder);
-//
+        ConfigurationTest.testInner(holder);
-//        EasySQL.shutdownManager(manager);
+
+        ConfigurationTest.save(holder);
+
+        EasySQL.shutdownManager(manager);
     }
 
 }

providers/yaml/README.md

@@ -62,74 +62,3 @@ dependencies {
     api "cc.carm.lib:easyconfiguration-yaml:[LATEST RELEASE]"
 }
 ```
-
-## Example file format
-```yaml
-version: 1.0.0
-
-test-save: false
-
-test-number: 6161926779561752576
-
-test-enum: DAYS
-
-# Section类型数据测试
-user: # Section数据也支持InlineComment注释
-  name: '35882'
-  info:
-    uuid: 554b79f1-7c39-4960-82d1-5514c9734417
-
-uuid-value: 9a86663e-2fc7-4851-a423-c7e5d8e94a47 # This is an inline comment
-
-sub:
-  that:
-    operators: []
-
-# [ID - UUID]对照表
-
-# 用于测试Map类型的解析与序列化保存
-users:
-  '1': 1c055bdd-c9d1-4931-8270-3d162247f38a
-  '2': 934e2b05-2417-424e-80fd-fe58c6725837
-  '3': 442949a2-8345-4210-a87b-593d7168980e
-  '4': 5c015453-4b5b-42e3-ad87-b9498f2dfeab
-  '5': 8f9640e7-0fbd-4f73-b737-f0b707215e71
-
-# Inner Test
-inner:
-  inner-value: 51.223503560658166
-
-class-value: 1.0
-
-test:
-  # Section类型数据测试
-  user: # Section数据也支持InlineComment注释
-    name: Carm
-    info:
-      uuid: 3d1ef2a0-a38b-44f3-b15f-8e3b22cb8cc6
-
-# 以下内容用于测试序列化
-model-test:
-  some-model:
-    ==: SomeModel
-    num: 855
-    name: 4f6b7
-  any-model:
-    ==: AnyModel
-    name: 63d05
-    state: false
-  models:
-    - name: 481f3
-      state: true
-    - name: fcf3e
-      state: false
-    - name: '14e50'
-      state: false
-  model-map:
-    a:
-      name: 1fb9b
-      state: false
-    b:
-      name: 5486f
-      state: false
-```

providers/yaml/pom.xml

@@ -6,7 +6,7 @@
     <parent>
         <artifactId>easyconfiguration-parent</artifactId>
         <groupId>cc.carm.lib</groupId>
-        <version>4.0.1</version>
+        <version>4.0.8</version>
         <relativePath>../../pom.xml</relativePath>
     </parent>
     <properties>
@@ -29,13 +29,6 @@
             <scope>compile</scope>
         </dependency>
 
-        <dependency>
-            <groupId>cc.carm.lib</groupId>
-            <artifactId>yamlcommentwriter</artifactId>
-            <version>1.2.0</version>
-            <scope>compile</scope>
-        </dependency>
-
         <dependency>
             <groupId>${project.parent.groupId}</groupId>
             <artifactId>easyconfiguration-feature-file</artifactId>

providers/yaml/src/main/java/cc/carm/lib/configuration/source/yaml/YAMLSource.java

@@ -4,9 +4,8 @@ import cc.carm.lib.configuration.commentable.Commentable;
 import cc.carm.lib.configuration.commentable.CommentableOptions;
 import cc.carm.lib.configuration.source.ConfigurationHolder;
 import cc.carm.lib.configuration.source.file.FileConfigSource;
-import cc.carm.lib.configuration.source.option.StandardOptions;
 import cc.carm.lib.configuration.source.section.ConfigureSection;
-import cc.carm.lib.configuration.source.section.MemorySection;
+import cc.carm.lib.configuration.source.section.SourcedSection;
 import cc.carm.lib.yamlcommentupdater.CommentedSection;
 import cc.carm.lib.yamlcommentupdater.CommentedYAMLWriter;
 import org.jetbrains.annotations.NotNull;
@@ -27,14 +26,14 @@ import java.nio.charset.StandardCharsets;
 import java.util.*;
 
 public class YAMLSource
-        extends FileConfigSource<MemorySection, Map<String, Object>, YAMLSource>
+        extends FileConfigSource<SourcedSection, Map<String, Object>, YAMLSource>
         implements CommentedSection {
 
     protected final @NotNull YamlConstructor yamlConstructor;
     protected final @NotNull YamlRepresenter yamlRepresenter;
     protected final @NotNull Yaml yaml;
 
-    protected @Nullable MemorySection rootSection;
+    protected @Nullable SourcedSection rootSection;
 
     protected YAMLSource(@NotNull ConfigurationHolder<? extends YAMLSource> holder,
                          @NotNull File file, @Nullable String resourcePath) {
@@ -56,8 +55,8 @@ public class YAMLSource
     }
 
     @Override
-    protected YAMLSource self() {
+    protected @NotNull YAMLSource self() {
-        return null;
+        return this;
     }
 
     @Override
@@ -66,15 +65,10 @@ public class YAMLSource
     }
 
     @Override
-    public @NotNull MemorySection section() {
+    public @NotNull SourcedSection section() {
         return Objects.requireNonNull(this.rootSection, "Root section is not initialized.");
     }
 
-    @Override
-    public char separator() {
-        return holder().options().get(StandardOptions.PATH_SEPARATOR);
-    }
-
     public @NotNull LoaderOptions loaderOptions() {
         return holder().options().get(YAMLOptions.LOADER);
     }
@@ -115,9 +109,9 @@ public class YAMLSource
     @Override
     public void save() throws Exception {
         CommentedYAMLWriter writer = new CommentedYAMLWriter(
-                String.valueOf(this.separator()),
+                String.valueOf(this.pathSeparator()),
                 dumperOptions().getIndent(),
-                holder.options().get(CommentableOptions.COMMENT_EMPTY_VALUE)
+                holder.option(CommentableOptions.COMMENT_EMPTY_VALUE)
         );
         try {
             fileWriter(w -> w.write(writer.saveToString(this)));
@@ -136,18 +130,18 @@ public class YAMLSource
         return this.saveToString(section());
     }
 
-    public @NotNull MemorySection loadFromString(@NotNull String data) throws Exception {
+    public @NotNull SourcedSection loadFromString(@NotNull String data) throws Exception {
         MappingNode mappingNode;
         try (Reader reader = new UnicodeReader(new ByteArrayInputStream(data.getBytes(StandardCharsets.UTF_8)))) {
             Node rawNode = this.yaml.compose(reader);
             mappingNode = (MappingNode) rawNode;
         }
-        if (mappingNode == null) return MemorySection.root(this);
+        if (mappingNode == null) return SourcedSection.root(this);
 
 
         Map<String, Object> map = new LinkedHashMap<>();
         this.constructMap(mappingNode, map);
-        return MemorySection.root(this, map);
+        return SourcedSection.root(this, map);
     }
 
     private void constructMap(@NotNull MappingNode mappingNode, @NotNull Map<String, Object> section) {
@@ -176,7 +170,7 @@ public class YAMLSource
     public String serializeValue(@NotNull String key, @NotNull Object value) {
         Map<String, Object> map = new LinkedHashMap<>();
         map.put(key, value);
-        return saveToString(MemorySection.root(this, map));
+        return saveToString(SourcedSection.root(this, map));
     }
 
     @Override

providers/yaml/src/test/java/sample/SampleConfig.java

@@ -2,6 +2,7 @@ package sample;
 
 import cc.carm.lib.configuration.Configuration;
 import cc.carm.lib.configuration.annotation.ConfigPath;
+import cc.carm.lib.configuration.annotation.FooterComments;
 import cc.carm.lib.configuration.annotation.HeaderComments;
 import cc.carm.lib.configuration.annotation.InlineComment;
 import cc.carm.lib.configuration.value.standard.ConfiguredList;
@@ -19,6 +20,8 @@ public interface SampleConfig extends Configuration {
     @HeaderComments("Server configurations") // Header comment
     ConfiguredValue<Integer> PORT = ConfiguredValue.of(Integer.class);
 
+    @HeaderComments({"[ UUID >-----------------------------------", "A lot of UUIDs"})
+    @FooterComments("[ UUID >-----------------------------------")
     ConfiguredList<UUID> UUIDS = ConfiguredList.builderOf(UUID.class).fromString()
             .parse(UUID::fromString).serialize(UUID::toString)
             .defaults(

providers/yaml/src/test/java/sample/SampleTest.java

@@ -11,7 +11,7 @@ public class  SampleTest {
         // 1. Make a configuration provider from a file.
         ConfigurationHolder<?> holder = YAMLConfigFactory.from("target/config.yml")
                 .resourcePath("configs/sample.yml")
-                .indent(4) // Optional: Set the indentation of the configuration file.
+                .indent(2) // Optional: Set the indentation of the configuration file.
                 .build();
 
         // 2. Initialize the configuration classes or instances.

providers/yaml/src/test/java/yaml/test/YamlTests.java

@@ -9,7 +9,6 @@ import org.junit.Test;
 
 import java.util.List;
 import java.util.Map;
-import java.util.regex.Pattern;
 
 public class YamlTests {