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+/*
+ * To change this template, choose Tools | Templates
+ * and open the template in the editor.
+ */
+
+package com.fourisland.fourpuzzle.database;
+
+import com.fourisland.fourpuzzle.transition.InTransition;
+import com.fourisland.fourpuzzle.transition.MultidirectionalTransition;
+import com.fourisland.fourpuzzle.transition.OutTransition;
+import com.fourisland.fourpuzzle.transition.SquareTransition;
+import com.fourisland.fourpuzzle.transition.Transition;
+import com.fourisland.fourpuzzle.transition.TransitionDirection;
+import com.fourisland.fourpuzzle.transition.TransitionUnsupportedException;
+
+/**
+ *
+ * @author hatkirby
+ */
+public enum Transitions {
+    MapExit(TransitionDirection.Out, new SquareTransition(TransitionDirection.Out)),
+    MapEnter(TransitionDirection.In, new SquareTransition(TransitionDirection.In));
+    
+    private final TransitionDirection dir;
+    private Transition trans;
+    private Transitions(TransitionDirection dir, Transition trans)
+    {
+        this.dir = dir;
+        
+        if (isTransitionSupported(dir, trans))
+        {
+            this.trans = trans;
+        } else {
+            throw new TransitionUnsupportedException(trans.getClass().getName(), dir);
+        }
+    }
+    
+    Transition getValue()
+    {
+        return trans;
+    }
+    
+    void setValue(Transition trans)
+    {
+        if (isTransitionSupported(dir, trans))
+        {
+            this.trans = trans;
+        } else {
+            throw new TransitionUnsupportedException(trans.getClass().getName(), dir);
+        }
+    }
+    
+    private boolean isTransitionSupported(TransitionDirection dir, Transition trans)
+    {
+        if (trans instanceof MultidirectionalTransition)
+        {
+            return (((MultidirectionalTransition) trans).getDirection() == dir);
+        } else if (trans instanceof OutTransition)
+        {
+            return (dir == TransitionDirection.Out);
+        } else if (trans instanceof InTransition)
+        {
+            return (dir == TransitionDirection.In);
+        }
+        
+        return false;
+    }
+}