Make regions Cloneable

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

@@ -66,4 +66,12 @@ public abstract class AbstractRegion implements Region {
         expand(change);
         contract(change);
     }
+
+    public AbstractRegion clone() {
+        try {
+            return (AbstractRegion) super.clone();
+        } catch (CloneNotSupportedException exc) {
+            return null;
+        }
+    }
 }

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

@@ -434,4 +434,8 @@ public class CuboidRegion extends AbstractRegion implements FlatRegion {
     public String toString() {
         return getMinimumPoint() + " - " + getMaximumPoint();
     }
+
+    public CuboidRegion clone() {
+        return (CuboidRegion) super.clone();
+    }
 }

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

@@ -388,4 +388,8 @@ public class CylinderRegion extends AbstractRegion implements FlatRegion {
     public String toString() {
         return center + " - " + radius;
     }
+
+    public CylinderRegion clone() {
+        return (CylinderRegion) super.clone();
+    }
 }

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

@@ -275,4 +275,8 @@ public class EllipsoidRegion extends AbstractRegion {
     public void extendRadius(Vector minRadius) {
         setRadius(Vector.getMaximum(minRadius, getRadius()));
     }
+
+    public EllipsoidRegion clone() {
+        return (EllipsoidRegion) super.clone();
+    }
 }

src/main/java/com/sk89q/worldedit/regions/Polygonal2DRegion.java

@@ -519,4 +519,10 @@ public class Polygonal2DRegion extends AbstractRegion implements FlatRegion {
         sb.append(" * (" + minY + " - " + maxY + ")");
         return sb.toString();
     }
+
+    public Polygonal2DRegion clone() {
+        Polygonal2DRegion clone = (Polygonal2DRegion) super.clone();
+        clone.points = new ArrayList<BlockVector2D>(points);
+        return clone; 
+    }
 }

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

@@ -29,7 +29,7 @@ import java.util.Set;
  *
  * @author sk89q
  */
-public interface Region extends Iterable<BlockVector> {
+public interface Region extends Iterable<BlockVector>, Cloneable {
     /**
      * Get the lower point of a region.
      *
@@ -151,4 +151,6 @@ public interface Region extends Iterable<BlockVector> {
      * @return
      */
     public void setWorld(LocalWorld world);
+
+    public Region clone();
 }