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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 pattern interface for Joomla
*
* A class that wants to observe another class must:
*
* 1) Add: implements JObserverInterface
* to its class
*
* 2) Implement a constructor, that can look like this:
* public function __construct(JObservableInterface $observableObject)
* {
* $observableObject->attachObserver($this);
* $this->observableObject = $observableObject;
* }
*
* 3) and must implement the instantiator function createObserver() below, e.g. as follows:
* public static function createObserver(JObservableInterface $observableObject, $params = array())
* {
* $observer = new self($observableObject);
* $observer->... = $params['...']; ...
* return $observer;
* }
*
* 4) Then add functions corresponding to the events to be observed,
* E.g. to respond to event: $this->_observers->update('onBeforeLoad', array($keys, $reset));
* following function is needed in the observer:
* public function onBeforeLoad($keys, $reset) { ... }
*
* 5) Finally, the binding is made outside the observable and observer classes, using:
* JObserverMapper::addObserverClassToClass('ObserverClassname', 'ObservableClassname', array('paramName' => 'paramValue'));
* where the last array will be provided to the observer instanciator function createObserver.
*
* @since 3.1.2
*/
interface JObserverInterface
{
/**
* Creates the associated observer instance and attaches it to the $observableObject
*
* @param JObservableInterface $observableObject The observable subject object
* @param array $params Params for this observer
*
* @return JObserverInterface
*
* @since 3.1.2
*/
public static function createObserver(JObservableInterface $observableObject, $params = array());
}