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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/SplPriorityQueue.php';
 
 /**
  * Specialized priority queue implementation for use with an intercepting 
  * filter chain.
  *
  * Allows removal
  *
  * @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_Filter_FilterIterator extends Zend_Stdlib_SplPriorityQueue
 {
     /**
      * Does the queue contain a given value?
      * 
      * @param  mixed $datum 
      * @return bool
      */
     public function contains($datum)
     {
         $chain = clone $this;
         foreach ($chain as $item) {
             if ($item === $datum) {
                 return true;
             }
         }
         return false;
     }
 
     /**
      * Remove a value from the queue
      *
      * This is an expensive operation. It must first iterate through all values,
      * and then re-populate itself. Use only if absolutely necessary.
      * 
      * @param  mixed $datum 
      * @return bool
      */
     public function remove($datum)
     {
         $this->setExtractFlags(self::EXTR_BOTH);
 
         // Iterate and remove any matches
         $removed = false;
         $items   = array();
         $this->rewind();
         while (!$this->isEmpty()) {
             $item = $this->extract();
             if ($item['data'] === $datum) {
                 $removed = true;
                 continue;
             }
             $items[] = $item;
         }
 
         // Repopulate
         foreach ($items as $item) {
             $this->insert($item['data'], $item['priority']);
         }
 
         $this->setExtractFlags(self::EXTR_DATA);
         return $removed;
     }
 
     /**
      * Iterate the next filter in the chain
      *
      * Iterates and calls the next filter in the chain.
      *
      * @param  mixed                                   $context
      * @param  array                                   $params
      * @param  Zend_EventManager_Filter_FilterIterator $chain
      * @return mixed
      */
     public function next($context = null, array $params = array(), $chain = null)
     {
         if (empty($context) || $chain->isEmpty()) {
             return;
         }
 
         $next = $this->extract();
         if (!$next instanceof Zend_Stdlib_CallbackHandler) {
             return;
         }
 
         $return = call_user_func($next->getCallback(), $context, $params, $chain);
         return $return;
     }
 }