Added NullExtent that drops changes.

src/main/java/com/sk89q/worldedit/extent/NullExtent.java

@@ -0,0 +1,68 @@
+/*
+ * 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.extent;
+
+import com.sk89q.worldedit.Vector;
+import com.sk89q.worldedit.WorldEditException;
+import com.sk89q.worldedit.blocks.BaseBlock;
+import com.sk89q.worldedit.function.operation.Operation;
+
+import javax.annotation.Nullable;
+
+/**
+ * An extent that returns air blocks for all blocks and does not
+ * pass on any changes.
+ */
+public class NullExtent implements Extent {
+
+    private final Vector nullPoint = new Vector(0, 0, 0);
+
+    @Override
+    public Vector getMinimumPoint() {
+        return nullPoint;
+    }
+
+    @Override
+    public Vector getMaximumPoint() {
+        return nullPoint;
+    }
+
+    @Override
+    public BaseBlock getBlock(Vector position) {
+        return new BaseBlock(0);
+    }
+
+    @Override
+    public BaseBlock getLazyBlock(Vector position) {
+        return new BaseBlock(0);
+    }
+
+    @Override
+    public boolean setBlock(Vector position, BaseBlock block) throws WorldEditException {
+        return false;
+    }
+
+    @Nullable
+    @Override
+    public Operation commit() {
+        return null;
+    }
+
+}