fix: Fixed the missing implements of #remove

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")
-interface SampleConfig extends Configuration {
+@ConfigPath(root = true)
+@HeaderComments("Configurations for sample")
+public interface SampleConfig extends Configuration {
 
-    @InlineComment("Enabled?") // Inline comment
-    ConfiguredValue<Boolean> ENABLED = ConfiguredValue.of(true);
+  @InlineComment("Enabled?") // Inline comment
+  ConfiguredValue<Boolean> ENABLED = ConfiguredValue.of(true);
 
-    ConfiguredList<UUID> UUIDS = ConfiguredList.builderOf(UUID.class).fromString()
-            .parseValue(UUID::fromString).serializeValue(UUID::toString)
-            .defaults(
-                    UUID.fromString("00000000-0000-0000-0000-000000000000"),
-                    UUID.fromString("00000000-0000-0000-0000-000000000001")
-            ).build();
+  @HeaderComments("Server configurations") // Header comment
+  ConfiguredValue<Integer> PORT = ConfiguredValue.of(Integer.class);
 
-    interface INFO extends Configuration {
-        
-        @HeaderComment("Configure your name!") // Header comment
-        ConfiguredValue<String> NAME = ConfiguredValue.of("Joker");
+  @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();
+
+  @ConfigPath("info") // Custom path
+  interface INFO extends Configuration {
+
+    @HeaderComments("Configure your name!") // Header comment
+    ConfiguredValue<String> NAME = ConfiguredValue.of("Joker");
+
+    @ConfigPath("how-old-are-you") // Custom path
+    ConfiguredValue<Integer> AGE = ConfiguredValue.of(24);
+
+  }
 
-        @ConfigPath("year") // 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.
-    api "cc.carm.lib:easyconfiguration-json:[LATEST RELEASE]"
+    // JSON file-based implementation, compatible with all Java environments.
+    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
 

README_CN.md

@@ -43,42 +43,57 @@ README LANGUAGES [ [English](README.md) | [**中文**](README_CN.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 {
+@ConfigPath(root = true)
+@HeaderComments("Configurations for sample")
+public interface SampleConfig extends Configuration {
 
-    @InlineComment("Enabled?") // 行内注释
-    ConfiguredValue<Boolean> ENABLED = ConfiguredValue.of(true);
+  @InlineComment("Enabled?") // 行后注释
+  ConfiguredValue<Boolean> ENABLED = ConfiguredValue.of(true);
 
-    ConfiguredList<UUID> UUIDS = ConfiguredList.builderOf(UUID.class).fromString()
-            .parseValue(UUID::fromString).serializeValue(UUID::toString)
-            .defaults(
-                    UUID.fromString("00000000-0000-0000-0000-000000000000"),
-                    UUID.fromString("00000000-0000-0000-0000-000000000001")
-            ).build();
+  @HeaderComments("Server configurations") // 头部注释
+  ConfiguredValue<Integer> PORT = ConfiguredValue.of(Integer.class);
 
-    interface INFO extends Configuration {
-        
-        @HeaderComment("Configure your name!") // 头部注释
-        ConfiguredValue<String> NAME = ConfiguredValue.of("Joker");
+  @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();
+  
+  interface INFO extends Configuration {
+
+    @HeaderComments("Configure your name!") // Header comment
+    ConfiguredValue<String> NAME = ConfiguredValue.of("Joker");
+
+    @ConfigPath("how-old-are-you") // 自定义路径
+    ConfiguredValue<Integer> AGE = ConfiguredValue.of(24);
+
+  }
 
-        @ConfigPath("year") // 自定义配置路径，若不定义，则按照默认规则生成
-        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。
-        ConfigurationProvider<?> provider = EasyConfiguration.from("config.yml");
-        // 2. 通过 “Provider” 初始化配置类或配置实例。
-        provider.initialize(SampleConfig.class);
+        // 1. 生成一个 “holder” 用于给配置类提供源配置的文件。
+        ConfigurationHolder<?> holder = YAMLConfigFactory.from("target/config.yml")
+                .resourcePath("configs/sample.yml")
+                .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 +101,22 @@ 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 +185,7 @@ 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>
@@ -225,7 +246,7 @@ dependencies {
 
      //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]"
     

core/pom.xml

@@ -5,7 +5,7 @@
     <parent>
         <artifactId>easyconfiguration-parent</artifactId>
         <groupId>cc.carm.lib</groupId>
-        <version>4.0.1</version>
+        <version>4.0.2</version>
     </parent>
     <modelVersion>4.0.0</modelVersion>
     <properties>

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

@@ -6,6 +6,7 @@ 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.option.ConfigurationOption;
 import cc.carm.lib.configuration.source.option.ConfigurationOptionHolder;
 import cc.carm.lib.configuration.source.section.ConfigureSource;
 import cc.carm.lib.configuration.value.ValueManifest;
@@ -50,6 +51,10 @@ public abstract class ConfigurationHolder<SOURCE extends ConfigureSource<?, ?, S
         return options;
     }
 
+    public <O> O option(@NotNull ConfigurationOption<O> option) {
+        return options().get(option);
+    }
+
     public @NotNull Map<String, ConfigurationMetaHolder> metadata() {
         return this.metadata;
     }

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

@@ -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();
     }
 
 
@@ -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);
@@ -175,8 +175,11 @@ public class ConfigurationInitializer {
                 } catch (Exception e) {
                     e.printStackTrace();
                 }
-                if (holder.options().get(StandardOptions.SET_DEFAULTS)) {
-                    value.setDefault();
+                if (holder.option(StandardOptions.SET_DEFAULTS)) {
+                    value.setDefault(); // Set default value.
+                }
+                if (holder.option(StandardOptions.PRELOAD)) {
+                    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/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);
-    }
-
-    public static <T> ConfigurationOption<T> of(@NotNull Class<T> valueClazz, @NotNull T defaultValue) {
-        return new ConfigurationOption<>(valueClazz, defaultValue);
+        return new ConfigurationOption<>(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) {
-        this.valueClazz = valueClazz;
+    public ConfigurationOption(@NotNull V defaultValue) {
         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/section/ConfigureSection.java

@@ -1,7 +1,6 @@
 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;
@@ -12,62 +11,199 @@ 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);
-    }
-
+    /**
+     * 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 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);
 
+    /**
+     * 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);
 
+    /**
+     * 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 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.
+     */
     boolean contains(@NotNull String path);
 
+    /**
+     * 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);
     }
 
+    /**
+     * 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.
+     */
     @Nullable List<?> getList(@NotNull String path);
 
+    /**
+     * 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);
 
+    /**
+     * 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);
 
-    default @Nullable <T> T get(@NotNull String path, @NotNull Class<T> clazz) {
-        return get(path, null, clazz);
+    /**
+     * 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);
     }
 
-    default @Nullable <T> T get(@NotNull String path, @NotNull DataFunction<Object, T> parser) {
+    /**
+     * 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) {
-        return get(path, defaultValue, DataFunction.castObject(clazz));
+    default @Nullable <T> T get(@NotNull String path, @Nullable T defaults, @NotNull Class<T> 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 +218,290 @@ 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 a 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 a 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 a 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);
@@ -298,17 +599,41 @@ 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);
     }

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

@@ -1,12 +1,23 @@
 package cc.carm.lib.configuration.source.section;
 
 import cc.carm.lib.configuration.source.ConfigurationHolder;
+import cc.carm.lib.configuration.source.option.StandardOptions;
+import org.jetbrains.annotations.ApiStatus;
+import org.jetbrains.annotations.Contract;
 import org.jetbrains.annotations.NotNull;
 import org.jetbrains.annotations.Nullable;
 
 import java.util.List;
 import java.util.Map;
 
+/**
+ * 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.
+ */
 public abstract class ConfigureSource<
         SECTION extends ConfigureSection, ORIGINAL,
         SELF extends ConfigureSource<SECTION, ORIGINAL, SELF>>
@@ -24,28 +35,46 @@ 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 +83,15 @@ 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
-    }
-
-    @Override
-    public @NotNull ConfigureSource<?, ?, ?> source() {
-        return self();
+        return null;
     }
 
     @Override
@@ -80,8 +110,8 @@ public abstract class ConfigureSource<
     }
 
     @Override
-    public boolean isList(@NotNull String path) {
-        return section().isList(path);
+    public void remove(@NotNull String path) {
+        section().remove(path);
     }
 
     @Override
@@ -89,11 +119,6 @@ public abstract class ConfigureSource<
         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);

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
     }
 

demo/pom.xml

@@ -5,7 +5,7 @@
     <parent>
         <artifactId>easyconfiguration-parent</artifactId>
         <groupId>cc.carm.lib</groupId>
-        <version>4.0.1</version>
+        <version>4.0.2</version>
     </parent>
     <modelVersion>4.0.0</modelVersion>
     <properties>

features/commentable/pom.xml

@@ -6,7 +6,7 @@
     <parent>
         <groupId>cc.carm.lib</groupId>
         <artifactId>easyconfiguration-parent</artifactId>
-        <version>4.0.1</version>
+        <version>4.0.2</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>4.0.2</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>4.0.2</version>
         <relativePath>../../pom.xml</relativePath>
     </parent>
     <properties>

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

@@ -53,7 +53,6 @@ public class MemorySection implements ConfigureSection {
         return createChild(new LinkedHashMap<>());
     }
 
-    @Override
     public @NotNull ConfigureSource<? extends MemorySection, ?, ?> source() {
         return this.source;
     }
@@ -66,6 +65,10 @@ public class MemorySection implements ConfigureSection {
         return this.parent;
     }
 
+    public char pathSeparator() {
+        return source.pathSeparator();
+    }
+
     @Override
     public @NotNull Map<String, Object> getValues(boolean deep) {
         return Collections.unmodifiableMap(deep ? mapChildrenValues(this, null, true) : data());
@@ -85,6 +88,16 @@ public class MemorySection implements ConfigureSection {
         }
     }
 
+    @Override
+    public void remove(@NotNull String path) {
+        MemorySection section = getSectionFor(path);
+        if (section != this) {
+            section.remove(childPath(path));
+        } else {
+            this.data.remove(path);
+        }
+    }
+
     @Override
     public boolean contains(@NotNull String path) {
         return get(path) != null;
@@ -109,7 +122,7 @@ public class MemorySection implements ConfigureSection {
     }
 
     private MemorySection getSectionFor(String path) {
-        int index = path.indexOf(separator());
+        int index = path.indexOf(pathSeparator());
         if (index == -1) return this;
 
         String root = path.substring(0, index);
@@ -123,7 +136,7 @@ public class MemorySection implements ConfigureSection {
     }
 
     private String childPath(String path) {
-        int index = path.indexOf(separator());
+        int index = path.indexOf(pathSeparator());
         return (index == -1) ? path : path.substring(index + 1);
     }
 
@@ -138,7 +151,7 @@ public class MemorySection implements ConfigureSection {
                                                     @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();
+            String path = (parent == null ? "" : parent + pathSeparator()) + entry.getKey();
             output.remove(path);
             output.put(path, entry.getValue());
             if (deep && entry.getValue() instanceof MemorySection) {

features/text/pom.xml

@@ -6,7 +6,7 @@
     <parent>
         <groupId>cc.carm.lib</groupId>
         <artifactId>easyconfiguration-parent</artifactId>
-        <version>4.0.1</version>
+        <version>4.0.2</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>4.0.2</version>
         <relativePath>../../pom.xml</relativePath>
     </parent>
     <properties>

pom.xml

@@ -15,7 +15,7 @@
     <groupId>cc.carm.lib</groupId>
     <artifactId>easyconfiguration-parent</artifactId>
     <packaging>pom</packaging>
-    <version>4.0.1</version>
+    <version>4.0.2</version>
     <modules>
         <module>core</module>
         <module>features/section</module>

providers/gson/pom.xml

@@ -5,7 +5,7 @@
     <parent>
         <artifactId>easyconfiguration-parent</artifactId>
         <groupId>cc.carm.lib</groupId>
-        <version>4.0.1</version>
+        <version>4.0.2</version>
         <relativePath>../../pom.xml</relativePath>
     </parent>
     <modelVersion>4.0.0</modelVersion>

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

@@ -48,7 +48,7 @@ public class JSONSource extends FileConfigSource<MemorySection, Map<String, Obje
     }
 
     @Override
-    protected JSONSource self() {
+    protected @NotNull JSONSource self() {
         return this;
     }
 

providers/yaml/pom.xml

@@ -6,7 +6,7 @@
     <parent>
         <artifactId>easyconfiguration-parent</artifactId>
         <groupId>cc.carm.lib</groupId>
-        <version>4.0.1</version>
+        <version>4.0.2</version>
         <relativePath>../../pom.xml</relativePath>
     </parent>
     <properties>

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

@@ -4,7 +4,6 @@ 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.yamlcommentupdater.CommentedSection;
@@ -56,7 +55,7 @@ public class YAMLSource
     }
 
     @Override
-    protected YAMLSource self() {
+    protected @NotNull YAMLSource self() {
         return null;
     }
 
@@ -70,11 +69,6 @@ public class YAMLSource
         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)));

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.