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diff --git a/src/js/util/mxDictionary.js b/src/js/util/mxDictionary.js
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+/**
+ * $Id: mxDictionary.js,v 1.12 2012-04-26 08:08:54 gaudenz Exp $
+ * Copyright (c) 2006-2010, JGraph Ltd
+ */
+/**
+ * Class: mxDictionary
+ *
+ * A wrapper class for an associative array with object keys. Note: This
+ * implementation uses <mxObjectIdentitiy> to turn object keys into strings.
+ * 
+ * Constructor: mxEventSource
+ *
+ * Constructs a new dictionary which allows object to be used as keys.
+ */
+function mxDictionary()
+{
+	this.clear();
+};
+
+/**
+ * Function: map
+ *
+ * Stores the (key, value) pairs in this dictionary.
+ */
+mxDictionary.prototype.map = null;
+
+/**
+ * Function: clear
+ *
+ * Clears the dictionary.
+ */
+mxDictionary.prototype.clear = function()
+{
+	this.map = {};
+};
+
+/**
+ * Function: get
+ *
+ * Returns the value for the given key.
+ */
+mxDictionary.prototype.get = function(key)
+{
+	var id = mxObjectIdentity.get(key);
+	
+	return this.map[id];
+};
+
+/**
+ * Function: put
+ *
+ * Stores the value under the given key and returns the previous
+ * value for that key.
+ */
+mxDictionary.prototype.put = function(key, value)
+{
+	var id = mxObjectIdentity.get(key);
+	var previous = this.map[id];
+	this.map[id] = value;
+	
+	return previous;
+};
+
+/**
+ * Function: remove
+ *
+ * Removes the value for the given key and returns the value that
+ * has been removed.
+ */
+mxDictionary.prototype.remove = function(key)
+{
+	var id = mxObjectIdentity.get(key);
+	var previous = this.map[id];
+	delete this.map[id];
+	
+	return previous;
+};
+
+/**
+ * Function: getKeys
+ *
+ * Returns all keys as an array.
+ */
+mxDictionary.prototype.getKeys = function()
+{
+	var result = [];
+	
+	for (var key in this.map)
+	{
+		result.push(key);
+	}
+	
+	return result;
+};
+
+/**
+ * Function: getValues
+ *
+ * Returns all values as an array.
+ */
+mxDictionary.prototype.getValues = function()
+{
+	var result = [];
+	
+	for (var key in this.map)
+	{
+		result.push(this.map[key]);
+	}
+	
+	return result;
+};
+
+/**
+ * Function: visit
+ *
+ * Visits all entries in the dictionary using the given function with the
+ * following signature: function(key, value) where key is a string and
+ * value is an object.
+ * 
+ * Parameters:
+ * 
+ * visitor - A function that takes the key and value as arguments.
+ */
+mxDictionary.prototype.visit = function(visitor)
+{
+	for (var key in this.map)
+	{
+		visitor(key, this.map[key]);
+	}
+};