71 lines
1.9 KiB
PHP
71 lines
1.9 KiB
PHP
<?php
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/**
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* @package FrameworkOnFramework
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* @subpackage utils
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* @copyright Copyright (C) 2010-2016 Nicholas K. Dionysopoulos / Akeeba Ltd. All rights reserved.
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* @license GNU General Public License version 2 or later; see LICENSE.txt
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*/
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defined('F0F_INCLUDED') or die;
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/**
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* Defines an observable event.
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*
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* This class is based on JEvent as found in Joomla! 3.2.0
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*/
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abstract class F0FUtilsObservableEvent extends F0FUtilsObject
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{
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/**
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* Event object to observe.
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*
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* @var object
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*/
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protected $_subject = null;
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/**
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* Constructor
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*
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* @param object &$subject The object to observe.
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*/
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public function __construct(&$subject)
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{
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// Register the observer ($this) so we can be notified
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$subject->attach($this);
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// Set the subject to observe
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$this->_subject = &$subject;
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}
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/**
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* Method to trigger events.
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* The method first generates the even from the argument array. Then it unsets the argument
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* since the argument has no bearing on the event handler.
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* If the method exists it is called and returns its return value. If it does not exist it
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* returns null.
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*
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* @param array &$args Arguments
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*
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* @return mixed Routine return value
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*/
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public function update(&$args)
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{
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// First let's get the event from the argument array. Next we will unset the
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// event argument as it has no bearing on the method to handle the event.
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$event = $args['event'];
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unset($args['event']);
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/*
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* If the method to handle an event exists, call it and return its return
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* value. If it does not exist, return null.
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*/
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if (method_exists($this, $event))
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{
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return call_user_func_array(array($this, $event), $args);
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}
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else
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{
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return null;
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}
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}
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}
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