<?php

/**

 * @category   Zend

 * @package    Zend_Cloud

 * @subpackage Infrastructure

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

 */

require_once 'Zend/Cloud/AbstractFactory.php';

/**

 * Factory for infrastructure adapters

 * 

 * @package    Zend_Cloud

 * @subpackage Infrastructure

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

 */

class Zend_Cloud_Infrastructure_Factory extends Zend_Cloud_AbstractFactory

{

    const INFRASTRUCTURE_ADAPTER_KEY = 'infrastructure_adapter';

    /**

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

     */

    protected static $_adapterInterface = 'Zend_Cloud_Infrastructure_Adapter';

    /**

     * Constructor

     *

     * Private ctor - should not be used

     *

     * @return void

     */

    private function __construct()

    {

    }

    /**

     * Retrieve an adapter instance

     *

     * @param  array $options

     * @return void

     */

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

    {

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

        if (!$adapter) {

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

            throw new Zend_Cloud_Infrastructure_Exception(sprintf(

                'Class must be specified using the "%s" key',

                self::INFRASTRUCTURE_ADAPTER_KEY

            ));

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

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

            throw new Zend_Cloud_Infrastructure_Exception(sprintf(

                'Adapter must implement "%s"', self::$_adapterInterface

            ));

        }

        return $adapter;

    }

}