<?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

 * @license    http://framework.zend.com/license/new-bsd     New BSD License

 */

require_once 'Zend/Cloud/AbstractFactory.php';

/**

 * @category   Zend

 * @package    Zend_Cloud

 * @subpackage QueueService

 * @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

     * @return void

     */

    private function __construct()

    {

        // private ctor - should not be used

    }

    /**

     * Retrieve QueueService adapter

     * @return void

     */

    {

        $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;

    }

}