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 <?php
 /**
  * Zend Framework
  *
  * LICENSE
  *
  * This source file is subject to the new BSD license that is bundled
  * with this package in the file LICENSE.txt.
  * It is also available through the world-wide-web at this URL:
  * http://framework.zend.com/license/new-bsd
  * If you did not receive a copy of the license and are unable to
  * obtain it through the world-wide-web, please send an email
  * to license@zend.com so we can send you a copy immediately.
  *
  * @category   Zend
  * @package    Zend_EventManager
  * @copyright  Copyright (c) 2005-2015 Zend Technologies USA Inc. (http://www.zend.com)
  * @license    http://framework.zend.com/license/new-bsd     New BSD License
  */
 
 // require_once 'Zend/Stdlib/CallbackHandler.php';
 // require_once 'Zend/Stdlib/PriorityQueue.php';
 
 /**
  * Event manager: notification system
  *
  * Use the EventManager when you want to create a per-instance notification 
  * system for your objects.
  *
  * @category   Zend
  * @package    Zend_EventManager
  * @copyright  Copyright (c) 2005-2015 Zend Technologies USA Inc. (http://www.zend.com)
  * @license    http://framework.zend.com/license/new-bsd     New BSD License
  */
 class Zend_EventManager_GlobalEventManager
 {
     /**
      * @var Zend_EventManager_EventCollection
      */
     protected static $events;
 
     /**
      * Set the event collection on which this will operate
      * 
      * @param  null|Zend_EventManager_EventCollection $events 
      * @return void
      */
     public static function setEventCollection(Zend_EventManager_EventCollection $events = null)
     {
         self::$events = $events;
     }
 
     /**
      * Get event collection on which this operates
      *
      * @return Zend_EventManager_EventCollection
      */
     public static function getEventCollection()
     {
         if (null === self::$events) {
             self::setEventCollection(new Zend_EventManager_EventManager());
         }
         return self::$events;
     }
 
     /**
      * Trigger an event
      * 
      * @param  string $event 
      * @param  object|string $context 
      * @param  array|object $argv 
      * @return Zend_EventManager_ResponseCollection
      */
     public static function trigger($event, $context, $argv = array())
     {
         return self::getEventCollection()->trigger($event, $context, $argv);
     }
 
     /**
      * Trigger listeenrs until return value of one causes a callback to evaluate 
      * to true.
      * 
      * @param  string $event 
      * @param  string|object $context 
      * @param  array|object $argv 
      * @param  callback $callback 
      * @return Zend_EventManager_ResponseCollection
      */
     public static function triggerUntil($event, $context, $argv, $callback)
     {
         return self::getEventCollection()->triggerUntil($event, $context, $argv, $callback);
     }
 
     /**
      * Attach a listener to an event
      * 
      * @param  string $event 
      * @param  callback $callback 
      * @param  int $priority 
      * @return Zend_Stdlib_CallbackHandler
      */
     public static function attach($event, $callback, $priority = 1)
     {
         return self::getEventCollection()->attach($event, $callback, $priority);
     }
 
     /**
      * Detach a callback from a listener
      * 
      * @param  Zend_Stdlib_CallbackHandler $listener 
      * @return bool
      */
     public static function detach(Zend_Stdlib_CallbackHandler $listener)
     {
         return self::getEventCollection()->detach($listener);
     }
 
     /**
      * Retrieve list of events this object manages
      * 
      * @return array
      */
     public static function getEvents()
     {
         return self::getEventCollection()->getEvents();
     }
 
     /**
      * Retrieve all listeners for a given event
      * 
      * @param  string $event 
      * @return Zend_Stdlib_PriorityQueue|array
      */
     public static function getListeners($event)
     {
         return self::getEventCollection()->getListeners($event);
     }
 
     /**
      * Clear all listeners for a given event
      * 
      * @param  string $event 
      * @return void
      */
     public static function clearListeners($event)
     {
         return self::getEventCollection()->clearListeners($event);
     }
 }