david
802479ed64
git-svn-id: https://192.168.0.254/svn/Proyectos.FundacionLQDVI_WebCongresos/trunk@2 94ccb1af-fd9d-d947-8d90-7f70ea60afc8
59 lines
1.4 KiB
PHP
59 lines
1.4 KiB
PHP
<?php
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/**
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* @version $Id:observer.php 6961 2007-03-15 16:06:53Z tcp $
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* @package Joomla.Framework
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* @subpackage Base
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* @copyright Copyright (C) 2005 - 2010 Open Source Matters. All rights reserved.
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* @license GNU/GPL, see LICENSE.php
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* Joomla! is free software. This version may have been modified pursuant
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* to the GNU General Public License, and as distributed it includes or
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* is derivative of works licensed under the GNU General Public License or
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* other free or open source software licenses.
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* See COPYRIGHT.php for copyright notices and details.
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*/
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// Check to ensure this file is within the rest of the framework
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defined('JPATH_BASE') or die();
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/**
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* Abstract observer class to implement the observer design pattern
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*
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* @abstract
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* @subpackage Base
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* @since 1.5
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*/
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class JObserver extends JObject
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{
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/**
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* Event object to observe
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*
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* @access private
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* @var object
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*/
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var $_subject = null;
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/**
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* Constructor
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*/
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function __construct(& $subject)
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{
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// Register the observer ($this) so we can be notified
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$subject->attach($this);
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// Set the subject to observe
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$this->_subject = & $subject;
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}
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/**
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* Method to update the state of observable objects
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*
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* @abstract Implement in child classes
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* @access public
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* @return mixed
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*/
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function update() {
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return JError::raiseError('9', 'JObserver::update: Method not implemented', 'This method should be implemented in a child class');
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}
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}
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