observer.php

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<?php
/**
 * @package     Joomla.Legacy
 * @subpackage  Base
 *
 * @copyright   Copyright (C) 2005 - 2013 Open Source Matters, Inc. All rights reserved.
 * @license     GNU General Public License version 2 or later; see LICENSE
 */

defined('JPATH_PLATFORM') or die;

/**
 * Abstract observer class to implement the observer design pattern
 *
 * @package     Joomla.Legacy
 * @subpackage  Base
 * @since       11.1
 * @deprecated  12.3 (Platform) & 4.0 (CMS)
 * @codeCoverageIgnore
 */
abstract class JObserver extends JObject
{
        /**
         * Event object to observe.
         *
         * @var    object
         * @since  11.1
         * @deprecated  12.3
         */
        protected $_subject = null;

        /**
         * Constructor
         *
         * @param   object  &$subject  The object to observe.
         *
         * @since   11.1
         * @deprecated  12.3
         */
        public function __construct(&$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
         *
         * @param   array  &$args  An array of arguments to pass to the listener.
         *
         * @return  mixed
         *
         * @since   11.1
         * @deprecated  12.3
         */
        public abstract function update(&$args);
}