Including WorldUtil and PrimaryWorlds classes (from Pandacube private code)

pandalib-paper-reflect/src/main/java/fr/pandacube/lib/paper/reflect/util/PrimaryWorlds.java

@@ -0,0 +1,40 @@
+package fr.pandacube.lib.paper.reflect.util;
+
+import fr.pandacube.lib.paper.reflect.wrapper.craftbukkit.CraftServer;
+import fr.pandacube.lib.reflect.wrapper.ReflectWrapper;
+import org.bukkit.Bukkit;
+import org.bukkit.plugin.Plugin;
+
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.List;
+
+/**
+ * Utility method to get the list of the primary world of the Bukkit/Paper server.
+ * The primary worlds are the world that are loaded by the server at the startup, that the plugins cannot unload.
+ */
+public class PrimaryWorlds {
+
+	/**
+	 * An unmodifiable list containing the names of the primary worlds of this server instance, in the order they are
+	 * loaded. This list can be accessed even if the corresponding worlds are not yet loaded, for instance in the
+	 * {@link Plugin#onLoad()} method.
+	 */
+	public static final List<String> PRIMARY_WORLDS;
+
+
+	static {
+		List<String> primaryWorlds = new ArrayList<>(3);
+
+		String world = ReflectWrapper.wrapTyped(Bukkit.getServer(), CraftServer.class).getServer().getLevelIdName();
+
+		primaryWorlds.add(world);
+		if (Bukkit.getAllowNether()) primaryWorlds.add(world + "_nether");
+		if (Bukkit.getAllowEnd()) primaryWorlds.add(world + "_the_end");
+
+		PRIMARY_WORLDS = Collections.unmodifiableList(primaryWorlds);
+	}
+	
+
+	
+}