<?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_InfoCard

 * @subpackage Zend_InfoCard_Xml

 * @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: Assertion.php 20096 2010-01-06 02:05:09Z bkarwin $

 */

/**

 * Zend_InfoCard_Xml_Assertion_Interface

 */

require_once 'Zend/InfoCard/Xml/Assertion/Interface.php';

/**

 * Factory object to retrieve an Assertion object based on the type of XML document provided

 *

 * @category   Zend

 * @package    Zend_InfoCard

 * @subpackage Zend_InfoCard_Xml

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

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

 */

final class Zend_InfoCard_Xml_Assertion

{

    /**

     * The namespace for a SAML-formatted Assertion document

     */

    const TYPE_SAML = 'urn:oasis:names:tc:SAML:1.0:assertion';

    /**

     * Constructor (disabled)

     *

     * @return void

     */

    private function __construct()

    {

    }

    /**

     * Returns an instance of a InfoCard Assertion object based on the XML data provided

     *

     * @throws Zend_InfoCard_Xml_Exception

     * @param string $xmlData The XML-Formatted Assertion

     * @return Zend_InfoCard_Xml_Assertion_Interface

     * @throws Zend_InfoCard_Xml_Exception

     */

    static public function getInstance($xmlData)

    {

        if($xmlData instanceof Zend_InfoCard_Xml_Element) {

            $strXmlData = $xmlData->asXML();

        } else if (is_string($xmlData)) {

            $strXmlData = $xmlData;

        } else {

            require_once 'Zend/InfoCard/Xml/Exception.php';

            throw new Zend_InfoCard_Xml_Exception("Invalid Data provided to create instance");

        }

        $sxe = simplexml_load_string($strXmlData);

        $namespaces = $sxe->getDocNameSpaces();

        foreach($namespaces as $namespace) {

            switch($namespace) {

                case self::TYPE_SAML:

                    include_once 'Zend/InfoCard/Xml/Assertion/Saml.php';

                    return simplexml_load_string($strXmlData, 'Zend_InfoCard_Xml_Assertion_Saml', null);

            }

        }

        require_once 'Zend/InfoCard/Xml/Exception.php';

        throw new Zend_InfoCard_Xml_Exception("Unable to determine Assertion type by Namespace");

    }

}