Vn.HashParam = new Class
({
	Extends: Vn.Object
	,Tag: 'vn-hash-param'
	,Child: 'param'
	,Properties:
	{
		param:
		{
			type: Vn.Param
			,set: function (x)
			{
				this.link ({_param: x}, {'changed': this._onParamChange});
				this._refreshParam ();
			}
			,get: function ()
			{
				return this._param;
			}
		},
		key:
		{
			type: String
			,set: function (x)
			{
				this._key = x;
				this._onHashChange ();
			}
			,get: function ()
			{
				return this._key;
			}
		},
		value:
		{
			type: Object
			,set: function (x)
			{
				this._value = x;
			}
			,get: function ()
			{
				return this._value;
			}
		},
		type:
		{
			type: Object
			,set: function (x)
			{
				this._type = x;
				this._onHashChange ();
			}
			,get: function ()
			{
				return this._type;
			}
		}
	}
	
	,_lock: false
	,_value: undefined
	,_key: null
	,_type: null
	
	,initialize: function (props)
	{
		this.parent (props);
		var listener = Vn.Hash.getListener ();
		this.link ({_listener: listener}, {'changed': this._onHashChange});
		this._onHashChange ();
	}

	,_onHashChange: function ()
	{	
		if (!this._key || !this._listener)
			return;

		var newValue = Vn.Hash.get (this._key);
		
		if (this._type)
		switch (this._type)
		{
			case Boolean:
				newValue = (/^(true|1)$/i).test (newValue);
				break;
			case Number:
				newValue = 0 + new Number (newValue);
				break;
		}

		if (this._value != newValue)
		{
			this._value = newValue;
			this.signalEmit ('changed');
			this._refreshParam ();
		}
	}
	
	,_refreshParam: function ()
	{
		if (this._param && !this._lock)
		{
			this._lock = true;
			this._param.value = this._value;
			this._lock = false;
		}
	}
	
	,_onParamChange: function ()
	{
		if (this._lock)
			return;

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

		this._lock = true;
		Vn.Hash.add (map);
		this._lock = false;
	}
});