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<?php
/**
* @package Joomla.Platform
* @subpackage Observer
*
* @copyright (C) 2013 Open Source Matters, Inc. <https://www.joomla.org>
* @license GNU General Public License version 2 or later; see LICENSE
*/
defined('JPATH_PLATFORM') or die;
/**
* Observer mapping pattern implementation for Joomla
*
* @since 3.1.2
*/
class JObserverMapper
{
/**
* Array: array( JObservableInterface_classname => array( JObserverInterface_classname => array( paramname => param, .... ) ) )
*
* @var array
* @since 3.1.2
*/
protected static $observations = array();
/**
* Adds a mapping to observe $observerClass subjects with $observableClass observer/listener, attaching it on creation with $params
* on $observableClass instance creations
*
* @param string $observerClass The name of the observer class (implementing JObserverInterface)
* @param string $observableClass The name of the observable class (implementing JObservableInterface)
* @param array|boolean $params The params to give to the JObserverInterface::createObserver() function, or false to remove mapping
*
* @return void
*
* @since 3.1.2
*/
public static function addObserverClassToClass($observerClass, $observableClass, $params = array())
{
if ($params !== false)
{
static::$observations[$observableClass][$observerClass] = $params;
}
else
{
unset(static::$observations[$observableClass][$observerClass]);
}
}
/**
* Attaches all applicable observers to an $observableObject
*
* @param JObservableInterface $observableObject The observable subject object
*
* @return void
*
* @since 3.1.2
*/
public static function attachAllObservers(JObservableInterface $observableObject)
{
$observableClass = get_class($observableObject);
while ($observableClass != false)
{
// Attach applicable Observers for the class to the Observable subject:
if (isset(static::$observations[$observableClass]))
{
foreach (static::$observations[$observableClass] as $observerClass => $params)
{
// Attach an Observer to the Observable subject:
/**
* @var JObserverInterface $observerClass
*/
$observerClass::createObserver($observableObject, $params);
}
}
// Get parent class name (or false if none), and redo the above on it:
$observableClass = get_parent_class($observableClass);
}
}
}