<?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_Service_ShortUrl

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

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

 * @version    $Id: $

 */

/**

 * @see Zend_Service_Abstract

 */

require_once 'Zend/Service/Abstract.php';

/**

 * @see Zend_Service_ShortUrl_Shortener

 */

require_once 'Zend/Service/ShortUrl/Shortener.php';

/**

 * @category   Zend

 * @package    Zend_Service_ShortUrl

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

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

 */

abstract class Zend_Service_ShortUrl_AbstractShortener

    extends Zend_Service_Abstract 

    implements Zend_Service_ShortUrl_Shortener

{

    /**

     * Base URI of the service

     *

     * @var string

     */

    protected $_baseUri = null;

    /**

     * Checks whether URL to be shortened is valid

     *

     * @param string $url

     * @throws Zend_Service_ShortUrl_Exception When URL is not valid

     */

    protected function _validateUri($url)

    {

        require_once 'Zend/Uri.php';

        if (!Zend_Uri::check($url)) {

            require_once 'Zend/Service/ShortUrl/Exception.php';

            throw new Zend_Service_ShortUrl_Exception(sprintf(

                'The url "%s" is not valid and cannot be shortened', $url

            ));

        }

    }

    /**

     * Verifies that the URL has been shortened by this service

     *

     * @throws Zend_Service_ShortUrl_Exception If the URL hasn't been shortened by this service

     * @param string $shortenedUrl

     */

    protected function _verifyBaseUri($shortenedUrl)

    {

        if (strpos($shortenedUrl, $this->_baseUri) !== 0) {

            require_once 'Zend/Service/ShortUrl/Exception.php';

            throw new Zend_Service_ShortUrl_Exception(sprintf(

                'The url "%s" is not valid for this service and the target cannot be resolved',

                $shortenedUrl

            ));

        }

    }

}