1 files changed, 80 insertions, 20 deletions

@@ -10,30 +10,90 @@ package com.fourisland.fourpuzzle;
  * @author hatkirby
  */
 public enum Direction {
-    North,
-    East,
-    South,
-    West;
+    North
+    {
+        public Direction opposite()
+        {
+            return Direction.South;
+        }
+        
+        public Direction left()
+        {
+            return Direction.West;
+        }
+        
+        public Direction right()
+        {
+            return Direction.East;
+        }
+    },
+    East
+    {
+        public Direction opposite()
+        {
+            return Direction.West;
+        }
+        
+        public Direction left()
+        {
+            return Direction.North;
+        }
+        
+        public Direction right()
+        {
+            return Direction.South;
+        }
+    },
+    South
+    {
+        public Direction opposite()
+        {
+            return Direction.North;
+        }
+        
+        public Direction left()
+        {
+            return Direction.East;
+        }
+        
+        public Direction right()
+        {
+            return Direction.West;
+        }
+    },
+    West
+    {
+        public Direction opposite()
+        {
+            return Direction.East;
+        }
+        
+        public Direction left()
+        {
+            return Direction.South;
+        }
+        
+        public Direction right()
+        {
+            return Direction.North;
+        }
+    };
     
     /**
-     * TODO Find a way to serve the inverse of a Direction without using a
-     * switch, which is apparently bad practice
+     * Returns the direction opposite from the current one
+     * @return A Direction representing the wanted direction
      */
+    public abstract Direction opposite();
     
     /**
-     * Returns the direction opposite from the current one
-     * @return A Direction representing the opposite direction
+     * Returns the direction counterclockwise from the current one
+     * @return A Direction representing the wanted direction
      */
-    public Direction oppositeDirection()
-    {
-        switch (this)
-        {
-            case North: return Direction.South;
-            case West: return Direction.East;
-            case South: return Direction.North;
-            case East: return Direction.West;
-        }
-        
-        return null;
-    }
+    public abstract Direction left();
+    
+    /**
+     * Returns the direction clockwise from the current one
+     * @return A Direction representing the wanted direction
+     */
+    public abstract Direction right();
 }