module.exports = new Class
({
	Properties:
	{
		/**
		 * The internal object with the params.
		 */
		params:
		{ 
			type: Object
		}
	}

	/**
	 * Gets a value from the set.
	 *
	 * @param {String} field The field name
	 * @return {*} The field value
	 */
	,get: function () {}

	/**
	 * Sets a value on the set.
	 *
	 * @param {String} field The field name
	 * @param {*} value The new field value
	 */
	,set: function () {}

	/**
	 * Returns an array with the set keys.
	 * 
	 * @return {Array} The set keys
	 */
	,keys: function () {}

	/**
	 * Emits the 'change' signal on the set.
	 */
	,changed: function ()
	{
		this.signalEmit ('change');
	}

	/**
	 * Copies all values from another set.
	 *
	 * @param {Set} source The source set
	 */
	,assign: function (source, keys)
	{
		if (!keys)
			keys = source.keys ();

		for (var i = 0; i < keys.length; i++)
		{
			var key = keys[i];
			this.set (key, source.get (key));
		}
	}
});