/**
 * unFocus.Utilities.EventManager, version 1.0b (beta) (2005/12/16)
 * Copyright: 2005, Kevin Newman (http://www.unfocus.com/Projects/)
 * License: http://creativecommons.org/licenses/LGPL/2.1/
**/

if (typeof unFocus == "undefined") var unFocus = {};
if (!unFocus.Utilities) unFocus.Utilities = {};

unFocus.Utilities.EventManager = function() {
	this._listeners = {};
	for (var i = 0; i < arguments.length; i++) {
		this._listeners[arguments[i]] = [];
	}
};

unFocus.Utilities.EventManager.prototype = {

	addEventListener: function($name, $listener) {
		// check that listener is not in list
		for (var i = 0; i < this._listeners[$name].length; i++)
			if (this._listeners[$name][i] == $listener) return;
		// add listener to appropriate list
		this._listeners[$name].push($listener);
	},

	removeEventListener: function($name, $listener) {
		// search for the listener method
		for (var i = 0; i < this._listeners[$name].length; i++) {
			if (this._listeners[$name][i] == $listener) {
				this._listeners.splice(i,1);
				return;
			}
		}
	},

	notifyListeners: function($name, $data) {
		for (var i = 0; i < this._listeners[$name].length; i++)
			this._listeners[$name][i]($data);
	}
};