Added MVWorldDeleteEvent.

src/main/java/com/onarandombox/MultiverseCore/event/MVWorldDeleteEvent.java

@@ -0,0 +1,61 @@
+package com.onarandombox.MultiverseCore.event;
+
+import org.bukkit.event.Cancellable;
+import org.bukkit.event.Event;
+
+import com.onarandombox.MultiverseCore.api.MultiverseWorld;
+
+/**
+ * Called when a world is about to be deleted by Multiverse.
+ */
+public class MVWorldDeleteEvent extends Event implements Cancellable {
+    private boolean cancelled = false;
+
+    private final MultiverseWorld world;
+    private final boolean removeFromConfig;
+
+    public MVWorldDeleteEvent(MultiverseWorld world, boolean removeFromConfig) {
+        super("MVWorldDeleteEvent");
+
+        if (world == null)
+            throw new IllegalArgumentException("world can't be null!");
+
+        this.world = world;
+        this.removeFromConfig = removeFromConfig;
+    }
+
+    /**
+     * {@inheritDoc}
+     */
+    @Override
+    public boolean isCancelled() {
+        return cancelled;
+    }
+
+    /**
+     * {@inheritDoc}
+     */
+    @Override
+    public void setCancelled(boolean cancel) {
+        cancelled = cancel;
+    }
+
+    /**
+     * Gets the world that's about to be deleted.
+     *
+     * @return That {@link MultiverseWorld}.
+     */
+    public MultiverseWorld getWorld() {
+        return world;
+    }
+
+    /**
+     * Is the world about to be removed from the config?
+     *
+     * @return True if yes, false if no.
+     */
+    public boolean removeWorldFromConfig() {
+        return removeFromConfig;
+    }
+
+}

src/main/java/com/onarandombox/MultiverseCore/utils/WorldManager.java

@@ -11,6 +11,8 @@ import com.onarandombox.MultiverseCore.MVWorld;
 import com.onarandombox.MultiverseCore.MultiverseCore;
 import com.onarandombox.MultiverseCore.api.MVWorldManager;
 import com.onarandombox.MultiverseCore.api.MultiverseWorld;
+import com.onarandombox.MultiverseCore.event.MVWorldDeleteEvent;
+
 import org.bukkit.World;
 import org.bukkit.World.Environment;
 import org.bukkit.WorldCreator;
@@ -258,6 +260,15 @@ public class WorldManager implements MVWorldManager {
             // We can only delete loaded worlds
             return false;
         }
+
+        // call the event!
+        MVWorldDeleteEvent mvwde = new MVWorldDeleteEvent(getMVWorld(name), removeFromConfig);
+        this.plugin.getServer().getPluginManager().callEvent(mvwde);
+        if (mvwde.isCancelled()) {
+            this.plugin.log(Level.FINE, "Tried to delete a world, but the event was cancelled!");
+            return false;
+        }
+
         if (removeFromConfig) {
             if (!removeWorldFromConfig(name)) {
                 return false;