<?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 DocumentService

 * @copyright  Copyright (c) 2005-2010 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';

/**

 * Class implementing working with Azure queries in a structured way

 * 

 * TODO Look into preventing a query injection attack.

 *

 * @category   Zend

 * @package    Zend_Cloud

 * @subpackage DocumentService

 * @copyright  Copyright (c) 2005-2010 Zend Technologies USA Inc. (http://www.zend.com)

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

 */

class Zend_Cloud_DocumentService_Factory extends Zend_Cloud_AbstractFactory

{

    const DOCUMENT_ADAPTER_KEY = 'document_adapter';

    /**

     * @var string Interface which adapter must implement to be considered valid

     */

    protected static $_adapterInterface = 'Zend_Cloud_DocumentService_Adapter';

    /**

     * Constructor

     * 

     * @return void

     */

    private function __construct()

    {

        // private ctor - should not be used

    }

    /**

     * Retrieve an adapter instance

     * 

     * @param array $options 

     * @return void

     */

    public static function getAdapter($options = array()) 

    {

        $adapter = parent::_getAdapter(self::DOCUMENT_ADAPTER_KEY, $options);

        if (!$adapter) {

            require_once 'Zend/Cloud/DocumentService/Exception.php';

            throw new Zend_Cloud_DocumentService_Exception(

                'Class must be specified using the \''

                . self::DOCUMENT_ADAPTER_KEY . '\' key'

            );

        } elseif (!$adapter instanceof self::$_adapterInterface) {

            require_once 'Zend/Cloud/DocumentService/Exception.php';

            throw new Zend_Cloud_DocumentService_Exception(

                'Adapter must implement \'' . self::$_adapterInterface . '\''

            );

        }

        return $adapter;

    }

}