1 files changed, 25 insertions, 2 deletions
diff --git a/src/jrummikub/model/StoneTray.java b/src/jrummikub/model/StoneTray.java
index 52079d0..8b83371 100644
--- a/src/jrummikub/model/StoneTray.java
+++ b/src/jrummikub/model/StoneTray.java
@@ -18,8 +18,22 @@ public class StoneTray<E extends Sizeable> implements IStoneTray<E> {
 
 	/** Possible move directions in case of overlapping Stones/Sets */
 
-	private static enum Direction {
+	protected static enum Direction {
 		LEFT, RIGHT, TOP, BOTTOM;
+
+		public Direction reverse() {
+			switch (this) {
+			case LEFT:
+				return RIGHT;
+			case RIGHT:
+				return LEFT;
+			case TOP:
+				return BOTTOM;
+			case BOTTOM:
+				return TOP;
+			}
+			return null;
+		}
 	}
 
 	@Override
@@ -56,6 +70,13 @@ public class StoneTray<E extends Sizeable> implements IStoneTray<E> {
 
 	@SuppressWarnings("unchecked")
 	private void drop(E object, Position position, Direction direction) {
+		Pair<Position, Direction> update = fixInvalidDrop(object, position,
+				direction);
+		if (update != null) {
+			position = update.getFirst();
+			direction = update.getSecond();
+		}
+
 		objects.put(object, new Pair<E, Position>(object, position));
 		for (Pair<E, Position> i : ((Map<E, Pair<E, Position>>) objects.clone())
 				.values()) {
@@ -103,11 +124,13 @@ public class StoneTray<E extends Sizeable> implements IStoneTray<E> {
 	 * 
 	 * @param object
 	 *          to be dropped
+	 * @param dir
 	 * @param p
 	 *          the object is dropped at
 	 * @return null if the drop is valid, new position otherwise
 	 */
-	protected Position fixInvalidDrop(E object, Position pos) {
+	protected Pair<Position, Direction> fixInvalidDrop(E object, Position pos,
+			Direction dir) {
 		return null;
 	}