/*
	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/
*/
// make sure faux-namespace is available before adding to it
if (typeof unFocus == 'undefined') var unFocus = {};
if (!unFocus.Utilities) unFocus.Utilities = {};

/* Class EventManager
	Provides the interface and functionality to a Subscriber/Subscriber Pattern interface for
	classes to easily inherit or use. */
unFocus.Utilities.EventManager = function(arg) {
	this._listeners = {};
	for (var i = arguments.length; -1 < --i;) {
		this._listeners[arguments[i]] = [];
	}
};

/* Method: addEventListener
	A public method that adds an event listener to be called when the hash changes. */
unFocus.Utilities.EventManager.prototype.addEventListener = function($type, $listener) {
	// check that listener is not in list
	for (var i = this._listeners[$type].length; -1 < --i;)
		if (this._listeners[$type][i] == $listener) return;
	// add listener to appropriate list
	this._listeners[$type].push($listener);
};

/* Method: removeListener
	A public method that removes an event listener. */
unFocus.Utilities.EventManager.prototype.removeEventListener = function($type, $listener) {
	// search for the listener method
	for (var i = this._listeners[$type].length; -1 < --i;) {
		if (this._listeners[$type][i] == $listener) {
			this._listeners.splice(i,1);
			break;
		}
	}
};

/* Method: notifyListeners
	Notifies listeners when an event accurs. */
unFocus.Utilities.EventManager.prototype.notifyListeners = function($type, $data) {
	for (var i = this._listeners[$type].length; -1 < --i;)
		this._listeners[$type][i]($data);
};