Added a new preliminary mapping + metadata framework.

The eventual goal is to add:

1. Support for mapping block, etc. names (minecraft:stone, etc.)
2. Proper support for entities in WorldEdit
3. Support for querying for metadata about a block, entity, etc.
4. Extent support to biomes, structures, and so on

src/main/java/com/sk89q/worldedit/internal/LocalWorldAdapter.java

@@ -22,11 +22,14 @@ package com.sk89q.worldedit.internal;
 import com.sk89q.worldedit.*;
 import com.sk89q.worldedit.blocks.BaseBlock;
 import com.sk89q.worldedit.blocks.BaseItemStack;
+import com.sk89q.worldedit.entity.BaseEntity;
+import com.sk89q.worldedit.entity.Entity;
 import com.sk89q.worldedit.function.mask.Mask;
 import com.sk89q.worldedit.function.operation.Operation;
 import com.sk89q.worldedit.regions.Region;
 import com.sk89q.worldedit.util.TreeGenerator.TreeType;
 import com.sk89q.worldedit.world.World;
+import com.sk89q.worldedit.world.mapping.Resolver;
 
 import javax.annotation.Nullable;
 
@@ -308,6 +311,33 @@ public class LocalWorldAdapter extends LocalWorld {
     public Operation commit() {
         return world.commit();
     }
+    @Override
+    public Resolver<BaseBlock> getBlockMapping() {
+        return world.getBlockMapping();
+    }
+
+    @Override
+    public Resolver<BaseEntity> getEntityMapping() {
+        return world.getEntityMapping();
+    }
+
+    @Override
+    @Nullable
+    public <T> T getMetaData(BaseBlock block, Class<T> metaDataClass) {
+        return world.getMetaData(block, metaDataClass);
+    }
+
+    @Override
+    @Nullable
+    public <T> T getMetaData(Entity entity, Class<T> metaDataClass) {
+        return world.getMetaData(entity, metaDataClass);
+    }
+
+    @Override
+    @Nullable
+    public <T> T getMetaData(BaseEntity entity, Class<T> metaDataClass) {
+        return world.getMetaData(entity, metaDataClass);
+    }
 
     public static LocalWorldAdapter wrap(World world) {
         return new LocalWorldAdapter(world);

src/main/java/com/sk89q/worldedit/internal/util/AbstractAdapter.java

@@ -0,0 +1,52 @@
+/*
+ * 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.internal.util;
+
+import static com.google.common.base.Preconditions.checkNotNull;
+
+/**
+ * Abstract class for adapters.
+ *
+ * @param <E> class of adapted objects
+ */
+public abstract class AbstractAdapter<E> {
+
+    private final E object;
+
+    /**
+     * Create a new instance.
+     *
+     * @param object the object to adapt
+     */
+    public AbstractAdapter(E object) {
+        checkNotNull(object);
+        this.object = object;
+    }
+
+    /**
+     * Get the object.
+     *
+     * @return the object
+     */
+    public E getHandle() {
+        return object;
+    }
+
+}