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<?php
/**
* @package Joomla.Platform
* @subpackage Observer
*
* @copyright Copyright (C) 2005 - 2015 Open Source Matters, Inc. All rights reserved.
* @license GNU General Public License version 2 or later; see LICENSE
*/
defined('JPATH_PLATFORM') or die;
/**
* Observer updater pattern implementation for Joomla
*
* @link https://docs.joomla.org/JObserverUpdater
* @since 3.1.2
*/
class JObserverUpdater implements JObserverUpdaterInterface
{
/**
* Generic JObserverInterface observers for this JObservableInterface
*
* @var JObserverInterface
* @since 3.1.2
*/
protected $observers = array();
/**
* Process observers (useful when a class extends significantly an observerved method, and calls observers itself
*
* @var boolean
* @since 3.1.2
*/
protected $doCallObservers = true;
/**
* Constructor
*
* @param JObservableInterface $observable The observable subject object
*
* @since 3.1.2
*/
public function __construct(JObservableInterface $observable)
{
// Not yet needed, but possible: $this->observable = $observable;
}
/**
* Adds an observer to the JObservableInterface instance updated by this
* This method can be called fron JObservableInterface::attachObserver
*
* @param JObserverInterface $observer The observer object
*
* @return void
*
* @since 3.1.2
*/
public function attachObserver(JObserverInterface $observer)
{
$this->observers[get_class($observer)] = $observer;
}
/**
* Gets the instance of the observer of class $observerClass
*
* @param string $observerClass The class name of the observer
*
* @return JTableObserver|null The observer object of this class if any
*
* @since 3.1.2
*/
public function getObserverOfClass($observerClass)
{
if (isset($this->observers[$observerClass]))
{
return $this->observers[$observerClass];
}
return null;
}
/**
* Call all observers for $event with $params
*
* @param string $event Name of the event
* @param array $params Params of the event
*
* @return void
*
* @since 3.1.2
*/
public function update($event, $params)
{
if ($this->doCallObservers)
{
foreach ($this->observers as $observer)
{
$eventListener = array($observer, $event);
if (is_callable($eventListener))
{
call_user_func_array($eventListener, $params);
}
}
}
}
/**
* Enable/Disable calling of observers (this is useful when calling parent:: function
*
* @param boolean $enabled Enable (true) or Disable (false) the observer events
*
* @return boolean Returns old state
*
* @since 3.1.2
*/
public function doCallObservers($enabled)
{
$oldState = $this->doCallObservers;
$this->doCallObservers = $enabled;
return $oldState;
}
}