Vn.HashLink = new Class
({
	Extends: Vn.Object
	,Tag: 'vn-hash-link'
	,Parent: 'param'
	,Properties:
	{
		param:
		{
			type: Vn.Param
			,set: function (x)
			{
				this.link ({_param: x}, {'changed': this.onParamChange});
				this.onHashChange ();
			}
			,get: function ()
			{
				return this._param;
			}
		},
		hash:
		{
			type: Vn.Hash
			,set: function (x)
			{
				this.link ({_hash: x}, {'changed': this.onHashChange});
				this.onHashChange ();
			}
			,get: function ()
			{
				return this._hash;
			}
		},
		key:
		{
			type: String
			,set: function (x)
			{
				this._key = x;
				this.onHashChange ();
			}
			,get: function ()
			{
				return this._key;
			}
		}
	}
	
	,lock: false
	,value: null
	,_key: null

	,onHashChange: function ()
	{
		if (!this._key || !this._hash)
			return;

		var newValue = this._hash.get (this._key);

		if (this.value != newValue)
		{
			this.value = newValue;
			this.signalEmit ('changed');
	
			if (this._param && !this.lock)
			{
				this.lock = true;
				this._param.value = newValue;
				this.lock = false;
			}
		}
	}
	
	,onParamChange: function ()
	{
		if (this.lock)
			return;

		var map = {};
		map[this.key] = this._param.value;

		this.lock = true;
		this._hash.add (map);
		this.lock = false;
	}
});