[CI skip] Some additional API work

src/main/java/io/github/thebusybiscuit/slimefun4/api/ErrorReport.java

@@ -30,16 +30,8 @@ public class ErrorReport {
 	private File file;
 	
 	public ErrorReport(Throwable throwable, Consumer<PrintStream> printer) {
-		SlimefunPlugin.instance.getServer().getScheduler().scheduleSyncDelayedTask(SlimefunPlugin.instance, () -> {
-			String path = "plugins/Slimefun/error-reports/" + new SimpleDateFormat("yyyy-MM-dd-HH-mm").format(new Date());
-			file = new File(path + ".err");
-			
-			if (file.exists()) {
-				IntStream stream = IntStream.iterate(1, i -> i + 1).filter(i -> !new File(path + " (" + i + ").err").exists());
-				int id = stream.findFirst().getAsInt();
-				
-				file = new File(path + " (" + id + ").err");
-			}
+		Slimefun.runSync(() -> {
+			file = getNewFile();
 			
 			try (PrintStream stream = new PrintStream(file)) {
 				stream.println();
@@ -99,7 +91,7 @@ public class ErrorReport {
 			}
 		});
 	}
-	
+
 	public ErrorReport(Throwable throwable, TickerTask task, Location l, SlimefunItem item) {
 		this(throwable, stream -> {
 			stream.println("Block Info:");
@@ -158,6 +150,20 @@ public class ErrorReport {
 			stream.println();
 		});
 	}
+	
+	private File getNewFile() {
+		String path = "plugins/Slimefun/error-reports/" + new SimpleDateFormat("yyyy-MM-dd-HH-mm").format(new Date());
+		File file = new File(path + ".err");
+		
+		if (file.exists()) {
+			IntStream stream = IntStream.iterate(1, i -> i + 1).filter(i -> !new File(path + " (" + i + ").err").exists());
+			int id = stream.findFirst().getAsInt();
+			
+			file = new File(path + " (" + id + ").err");
+		}
+		
+		return file;
+	}
 
 	public File getFile() {
 		return file;

src/main/java/io/github/thebusybiscuit/slimefun4/api/JsonDataHolder.java

@@ -23,13 +23,13 @@ public abstract class JsonDataHolder {
 		dirty = true;
 	}
 	
-	public boolean isDirty() {
-		return dirty;
-	}
-	
 	public void markClean() {
 		dirty = false;
 	}
+	
+	public boolean isDirty() {
+		return dirty;
+	}
 
 	// Setters
 	public void setString(String key, String value) {
@@ -128,10 +128,7 @@ public abstract class JsonDataHolder {
 	protected <T> Optional<T[]> getArray(String key, IntFunction<T[]> constructor, Function<JsonElement, T> getter) {
 		JsonElement element = data.get(key);
 		
-		if (element == null || !(element instanceof JsonArray)) {
-			return Optional.empty();
-		}
-		else {
+		if (element instanceof JsonArray) {
 			JsonArray json = (JsonArray) element;
 			T[] array = constructor.apply(json.size());
 			
@@ -141,16 +138,19 @@ public abstract class JsonDataHolder {
 			
 			return Optional.of(array);
 		}
+		else {
+			return Optional.empty();
+		}
 	}
 	
 	protected <T> Optional<T> getPrimitive(String key, Function<JsonElement, T> getter) {
 		JsonElement element = data.get(key);
 		
-		if (element == null || !(element instanceof JsonPrimitive)) {
-			return Optional.empty();
+		if (element instanceof JsonPrimitive) {
+			return Optional.of(getter.apply(element));
 		}
 		else {
-			return Optional.of(getter.apply(element));
+			return Optional.empty();
 		}
 	}
 

src/main/java/io/github/thebusybiscuit/slimefun4/api/items/ItemRestriction.java

@@ -0,0 +1,36 @@
+package io.github.thebusybiscuit.slimefun4.api.items;
+
+import org.bukkit.entity.Player;
+import org.bukkit.inventory.ItemStack;
+
+import me.mrCookieSlime.Slimefun.Objects.SlimefunItem.SlimefunItem;
+import me.mrCookieSlime.Slimefun.api.PlayerProfile;
+
+public interface ItemRestriction {
+	
+	/**
+	 * This method represents a check.
+	 * The returned boolean will decide whether to allow the action.
+	 * 
+	 * @param profile	The Player's profile
+	 * @param p			The Player itself
+	 * @param item		The SlimefunItem that the {@link ItemStack} represents
+	 * @param itemstack	The ItemStack that is being tested.
+	 */
+	boolean isAllowed(PlayerProfile profile, Player p, SlimefunItem item, ItemStack itemstack);
+	
+	/**
+	 * This method is executed if an ItemRestriction took affect.
+	 * Override it to send a message to the Player telling them they cannot
+	 * use that item, or do something else in there.
+	 * 
+	 * @param profile	The Player's profile
+	 * @param p			The Player to warn
+	 * @param item		The SlimefunItem that the {@link ItemStack} represents
+	 * @param itemstack	The ItemStack that was prevented from being used
+	 */
+	void warnPlayer(PlayerProfile profile, Player p, SlimefunItem item, ItemStack itemstack);
+	
+	
+
+}