forked from joomla/joomla-platform
-
Notifications
You must be signed in to change notification settings - Fork 0
/
observer.php
54 lines (49 loc) · 1.15 KB
/
observer.php
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
<?php
/**
* @version $Id:observer.php 6961 2007-03-15 16:06:53Z tcp $
* @package Joomla.Framework
* @subpackage Base
* @copyright Copyright (C) 2005 - 2011 Open Source Matters, Inc. All rights reserved.
* @license GNU General Public License version 2 or later; see LICENSE.txt
*/
defined('JPATH_BASE') or die;
/**
* Abstract observer class to implement the observer design pattern
*
* @abstract
* @package Joomla.Framework
* @subpackage Base
* @since 1.5
*/
abstract class JObserver extends JObject
{
/**
* Event object to observe.
*
* @var object
*/
protected $_subject = null;
/**
* Constructor
*
* @access protected
* @param object $subject The object to observe.
* @return void
*/
function __construct(&$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
* @param array $args An array of arguments to pass to the listener.
* @return mixed
*/
abstract public function update(&$args);
}