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<?php
/**
* @version $Id:observer.php 6961 2007-03-15 16:06:53Z tcp $
* @package Joomla.Framework
* @subpackage Base
* @copyright Copyright (C) 2005 - 2010 Open Source Matters. All rights reserved.
* @license GNU/GPL, see LICENSE.php
* Joomla! is free software. This version may have been modified pursuant
* to the GNU General Public License, and as distributed it includes or
* is derivative of works licensed under the GNU General Public License or
* other free or open source software licenses.
* See COPYRIGHT.php for copyright notices and details.
*/
// Check to ensure this file is within the rest of the framework
defined('JPATH_BASE') or die();
/**
* Abstract observer class to implement the observer design pattern
*
* @abstract
* @subpackage Base
* @since 1.5
*/
class JObserver extends JObject
{
/**
* Event object to observe
*
* @access private
* @var object
*/
var $_subject = null;
/**
* Constructor
*/
function __construct(& $subject)
{
// Register the observer ($this) so we can be notified
$subject->attach($this);
// Set the subject to observe
$this->_subject = & $subject;
}
/**
* Method to update the state of observable objects
*
* @abstract Implement in child classes
* @access public
* @return mixed
*/
function update() {
return JError::raiseError('9', 'JObserver::update: Method not implemented', 'This method should be implemented in a child class');
}
}