Made BukkitEntity keep a weak ref to the entity and cleaned up code.

src/bukkit/java/com/sk89q/worldedit/bukkit/BukkitEntity.java

@@ -24,11 +24,12 @@ import com.sk89q.worldedit.entity.BaseEntity;
 import com.sk89q.worldedit.entity.Entity;
 import com.sk89q.worldedit.entity.Player;
 import com.sk89q.worldedit.entity.metadata.EntityType;
-import com.sk89q.worldedit.entity.metadata.Tameable;
 import com.sk89q.worldedit.extent.Extent;
 import com.sk89q.worldedit.util.Location;
+import com.sk89q.worldedit.world.NullWorld;
 
 import javax.annotation.Nullable;
+import java.lang.ref.WeakReference;
 
 import static com.google.common.base.Preconditions.checkNotNull;
 
@@ -37,7 +38,7 @@ import static com.google.common.base.Preconditions.checkNotNull;
  */
 class BukkitEntity implements Entity {
 
-    private final org.bukkit.entity.Entity entity;
+    private final WeakReference<org.bukkit.entity.Entity> entityRef;
 
     /**
      * Create a new instance.
@@ -46,39 +47,33 @@ class BukkitEntity implements Entity {
      */
     BukkitEntity(org.bukkit.entity.Entity entity) {
         checkNotNull(entity);
-        this.entity = entity;
-    }
-
-    /**
-     * Get the underlying Bukkit entity.
-     *
-     * @return the Bukkit entity
-     */
-    protected org.bukkit.entity.Entity getEntity() {
-        return entity;
-    }
-
-    @SuppressWarnings("unchecked")
-    <T> T getMetaData(Class<T> metaDataClass) {
-        if (metaDataClass == Tameable.class && getEntity() instanceof org.bukkit.entity.Tameable) {
-            return (T) new TameableAdapter((org.bukkit.entity.Tameable) getEntity());
-        } else {
-            return null;
-        }
+        this.entityRef = new WeakReference<org.bukkit.entity.Entity>(entity);
     }
 
     @Override
     public Extent getExtent() {
-        return BukkitAdapter.adapt(getEntity().getWorld());
+        org.bukkit.entity.Entity entity = entityRef.get();
+        if (entity != null) {
+            return BukkitAdapter.adapt(entity.getWorld());
+        } else {
+            return NullWorld.getInstance();
+        }
     }
 
     @Override
     public Location getLocation() {
-        return BukkitAdapter.adapt(getEntity().getLocation());
+        org.bukkit.entity.Entity entity = entityRef.get();
+        if (entity != null) {
+            return BukkitAdapter.adapt(entity.getLocation());
+        } else {
+            return new Location(NullWorld.getInstance());
+        }
     }
 
     @Override
     public BaseEntity getState() {
+        org.bukkit.entity.Entity entity = entityRef.get();
+        if (entity != null) {
             if (entity instanceof Player) {
                 return null;
             }
@@ -89,19 +84,28 @@ class BukkitEntity implements Entity {
             } else {
                 return null;
             }
+        } else {
+            return null;
+        }
     }
 
     @Override
     public boolean remove() {
+        org.bukkit.entity.Entity entity = entityRef.get();
+        if (entity != null) {
             entity.remove();
             return entity.isDead();
+        } else {
+            return true;
+        }
     }
 
     @SuppressWarnings("unchecked")
     @Nullable
     @Override
     public <T> T getFacet(Class<? extends T> cls) {
-        if (EntityType.class.isAssignableFrom(cls)) {
+        org.bukkit.entity.Entity entity = entityRef.get();
+        if (entity != null && EntityType.class.isAssignableFrom(cls)) {
             return (T) new BukkitEntityType(entity);
         } else {
             return null;

src/bukkit/java/com/sk89q/worldedit/bukkit/TameableAdapter.java

@@ -1,40 +0,0 @@
-/*
- * WorldEdit, a Minecraft world manipulation toolkit
- * Copyright (C) sk89q <http://www.sk89q.com>
- * Copyright (C) WorldEdit team and contributors
- *
- * This program is free software: you can redistribute it and/or modify it
- * under the terms of the GNU Lesser General Public License as published by the
- * Free Software Foundation, either version 3 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License
- * for more details.
- *
- * You should have received a copy of the GNU Lesser General Public License
- * along with this program. If not, see <http://www.gnu.org/licenses/>.
- */
-
-package com.sk89q.worldedit.bukkit;
-
-import com.sk89q.worldedit.entity.metadata.Tameable;
-import com.sk89q.worldedit.internal.util.AbstractAdapter;
-
-/**
- * Adapts a Bukkit {@link org.bukkit.entity.Tameable} into a WorldEdit
- * equivalent.
- */
-public class TameableAdapter extends AbstractAdapter<org.bukkit.entity.Tameable> implements Tameable {
-
-    TameableAdapter(org.bukkit.entity.Tameable entity) {
-        super(entity);
-    }
-
-    @Override
-    public boolean isTamed() {
-        return getHandle().isTamed();
-    }
-
-}

src/main/java/com/sk89q/worldedit/EditSession.java

@@ -190,7 +190,7 @@ public class EditSession implements Extent {
             this.bypassNone = extent;
         } else {
             Extent extent = new NullExtent();
-            extent = survivalExtent = new SurvivalModeExtent(extent, new NullWorld());
+            extent = survivalExtent = new SurvivalModeExtent(extent, NullWorld.getInstance());
             extent = blockBagExtent = new BlockBagExtent(extent, blockBag);
             extent = reorderExtent = new MultiStageReorder(extent, false);
             extent = maskingExtent = new MaskingExtent(extent, Masks.alwaysTrue());

src/main/java/com/sk89q/worldedit/entity/metadata/Creature.java

@@ -1,56 +0,0 @@
-/*
- * WorldEdit, a Minecraft world manipulation toolkit
- * Copyright (C) sk89q <http://www.sk89q.com>
- * Copyright (C) WorldEdit team and contributors
- *
- * This program is free software: you can redistribute it and/or modify it
- * under the terms of the GNU Lesser General Public License as published by the
- * Free Software Foundation, either version 3 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License
- * for more details.
- *
- * You should have received a copy of the GNU Lesser General Public License
- * along with this program. If not, see <http://www.gnu.org/licenses/>.
- */
-
-package com.sk89q.worldedit.entity.metadata;
-
-/**
- * Describes a creature.
- */
-public interface Creature {
-
-    /**
-     * Returns whether the creature is a non-player character, such as
-     * a NPC human or a villager.
-     *
-     * @return true if the creature is an NPC
-     */
-    boolean isNpc();
-
-    /**
-     * Returns whether the creature can be tamed.
-     *
-     * @return true if the creature can be tamed
-     */
-    boolean isTameable();
-
-    /**
-     * Returns whether the creature is hostile.
-     *
-     * @return true if the creature is hostile
-     */
-    boolean isHostile();
-
-    /**
-     * Returns whether the creature is passive.
-     *
-     * @return true if the creature is passive
-     */
-    boolean isPassive();
-
-}

src/main/java/com/sk89q/worldedit/entity/metadata/Tameable.java

@@ -1,34 +0,0 @@
-/*
- * WorldEdit, a Minecraft world manipulation toolkit
- * Copyright (C) sk89q <http://www.sk89q.com>
- * Copyright (C) WorldEdit team and contributors
- *
- * This program is free software: you can redistribute it and/or modify it
- * under the terms of the GNU Lesser General Public License as published by the
- * Free Software Foundation, either version 3 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License
- * for more details.
- *
- * You should have received a copy of the GNU Lesser General Public License
- * along with this program. If not, see <http://www.gnu.org/licenses/>.
- */
-
-package com.sk89q.worldedit.entity.metadata;
-
-/**
- * Indicates a creature that can be tamed.
- */
-public interface Tameable {
-
-    /**
-     * Returns whether the creature is tamed.
-     *
-     * @return true if the creature is tamed
-     */
-    boolean isTamed();
-
-}

src/main/java/com/sk89q/worldedit/world/NullWorld.java

@@ -46,6 +46,11 @@ import java.util.List;
  */
 public class NullWorld extends AbstractWorld {
 
+    private static final NullWorld INSTANCE = new NullWorld();
+
+    protected NullWorld() {
+    }
+
     @Override
     public String getName() {
         return "null";
@@ -120,4 +125,14 @@ public class NullWorld extends AbstractWorld {
     public Entity createEntity(Location location, BaseEntity entity) {
         return null;
     }
+
+    /**
+     * Return an instance of this null world.
+     *
+     * @return a null world
+     */
+    public static NullWorld getInstance() {
+        return INSTANCE;
+    }
+
 }