Extracted an AbstractRegion class with some common functionality of all the region types.

src/main/java/com/sk89q/worldedit/regions/AbstractRegion.java

@@ -0,0 +1,34 @@
+package com.sk89q.worldedit.regions;
+
+import java.util.Iterator;
+
+import com.sk89q.worldedit.BlockVector;
+import com.sk89q.worldedit.LocalWorld;
+
+public abstract class AbstractRegion implements Region {
+    /**
+     * Stores the world.
+     */
+    protected LocalWorld world;
+
+    public AbstractRegion(LocalWorld world) {
+        this.world = world;
+    }
+
+    /**
+     * Get the iterator.
+     *
+     * @return iterator of points inside the region
+     */
+    public Iterator<BlockVector> iterator() {
+        return new RegionIterator(this);
+    }
+
+    public LocalWorld getWorld() {
+        return world;
+    }
+
+    public void setWorld(LocalWorld world) {
+        this.world = world;
+    }
+}