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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_Cloud
  * @subpackage QueueService
  * @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/Cloud/AbstractFactory.php';
 
 /**
  * @category   Zend
  * @package    Zend_Cloud
  * @subpackage QueueService
  * @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_Cloud_QueueService_Factory extends Zend_Cloud_AbstractFactory
 {
     const QUEUE_ADAPTER_KEY = 'queue_adapter';
 
     /**
      * @var string Interface which adapter must implement to be considered valid
      */
     protected static $_adapterInterface = 'Zend_Cloud_QueueService_Adapter';
 
     /**
      * Constructor
      */
     private function __construct()
     {
         // private ctor - should not be used
     }
 
     /**
      * Retrieve QueueService adapter
      *
      * @param  array $options
      * @return null|Zend_Cloud_DocumentService_Adapter|Zend_Cloud_QueueService_Adapter|Zend_Cloud_StorageService_Adapter
      * @throws Zend_Cloud_QueueService_Exception
      */
     public static function getAdapter($options = array())
     {
         $adapter = parent::_getAdapter(self::QUEUE_ADAPTER_KEY, $options);
         if (!$adapter) {
             // require_once 'Zend/Cloud/QueueService/Exception.php';
             throw new Zend_Cloud_QueueService_Exception('Class must be specified using the \'' .
             self::QUEUE_ADAPTER_KEY . '\' key');
         } elseif (!$adapter instanceof self::$_adapterInterface) {
             // require_once 'Zend/Cloud/QueueService/Exception.php';
             throw new Zend_Cloud_QueueService_Exception(
                 'Adapter must implement \'' . self::$_adapterInterface . '\''
             );
         }
         return $adapter;
     }
 }