<?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_Serializer

 * @subpackage Adapter

 * @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: Wddx.php 20574 2010-01-24 17:39:14Z mabe $

 */

/** @see Zend_Serializer_Adapter_AdapterAbstract */

require_once 'Zend/Serializer/Adapter/AdapterAbstract.php';

/**

 * @link       http://www.infoloom.com/gcaconfs/WEB/chicago98/simeonov.HTM

 * @link       http://en.wikipedia.org/wiki/WDDX

 * @category   Zend

 * @package    Zend_Serializer

 * @subpackage Adapter

 * @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_Serializer_Adapter_Wddx extends Zend_Serializer_Adapter_AdapterAbstract

{

    /**

     * @var array Default options

     */

    protected $_options = array(

        'comment' => null,

    );

    /**

     * Constructor

     * 

     * @param  array $opts 

     * @return void

     * @throws Zend_Serializer_Exception if wddx extension not found

     */

    public function __construct($opts = array())

    {

        if (!extension_loaded('wddx')) {

            require_once 'Zend/Serializer/Exception.php';

            throw new Zend_Serializer_Exception('PHP extension "wddx" is required for this adapter');

        }

        parent::__construct($opts);

    }

    /**

     * Serialize PHP to WDDX

     * 

     * @param  mixed $value 

     * @param  array $opts 

     * @return string

     * @throws Zend_Serializer_Exception on wddx error

     */

    public function serialize($value, array $opts = array())

    {

        $opts = $opts + $this->_options;

        if (isset($opts['comment']) && $opts['comment']) {

            $wddx = wddx_serialize_value($value, (string)$opts['comment']);

        } else {

            $wddx = wddx_serialize_value($value);

        }

        if ($wddx === false) {

            $lastErr = error_get_last();

            require_once 'Zend/Serializer/Exception.php';

            throw new Zend_Serializer_Exception($lastErr['message']);

        }

        return $wddx;

    }

    /**

     * Unserialize from WDDX to PHP

     * 

     * @param  string $wddx 

     * @param  array $opts 

     * @return mixed

     * @throws Zend_Serializer_Exception on wddx error

     */

    public function unserialize($wddx, array $opts = array())

    {

        $ret = wddx_deserialize($wddx);

        if ($ret === null) {

            // check if the returned NULL is valid

            // or based on an invalid wddx string

            try {

                $simpleXml = new SimpleXMLElement($wddx);

                if (isset($simpleXml->data[0]->null[0])) {

                    return null; // valid null

                }

                $errMsg = 'Can\'t unserialize wddx string';

            } catch (Exception $e) {

                $errMsg = $e->getMessage();

            }

            require_once 'Zend/Serializer/Exception.php';

            throw new Zend_Serializer_Exception($errMsg);

        }

        return $ret;

    }

}