<?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_Amazon

 * @subpackage Ec2

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

 */

/**

 * @see Zend_Http_Response

 */

require_once 'Zend/Http/Response.php';

/**

 * @category   Zend

 * @package    Zend_Service_Amazon

 * @subpackage Ec2

 * @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_Service_Amazon_Ec2_Response {

    /**

     * XML namespace used for EC2 responses.

     */

    protected $_xmlNamespace = 'http://ec2.amazonaws.com/doc/2009-04-04/';

    /**

     * The original HTTP response

     *

     * This contains the response body and headers.

     *

     * @var Zend_Http_Response

     */

    private $_httpResponse = null;

    /**

     * The response document object

     *

     * @var DOMDocument

     */

    private $_document = null;

    /**

     * The response XPath

     *

     * @var DOMXPath

     */

    private $_xpath = null;

    /**

     * Last error code

     *

     * @var integer

     */

    private $_errorCode = 0;

    /**

     * Last error message

     *

     * @var string

     */

    private $_errorMessage = '';

    /**

     * Creates a new high-level EC2 response object

     *

     * @param Zend_Http_Response $httpResponse the HTTP response.

     */

    public function __construct(Zend_Http_Response $httpResponse)

    {

        $this->_httpResponse = $httpResponse;

    }

    /**

     * Gets the XPath object for this response

     *

     * @return DOMXPath the XPath object for response.

     */

    public function getXPath()

    {

        if ($this->_xpath === null) {

            $document = $this->getDocument();

            if ($document === false) {

                $this->_xpath = false;

            } else {

                $this->_xpath = new DOMXPath($document);

                $this->_xpath->registerNamespace('ec2',

                    $this->getNamespace());

            }

        }

        return $this->_xpath;

    }

    /**

     * Gets the document object for this response

     *

     * @return DOMDocument the DOM Document for this response.

     */

    public function getDocument()

    {

        try {

            $body = $this->_httpResponse->getBody();

        } catch (Zend_Http_Exception $e) {

            $body = false;

        }

        if ($this->_document === null) {

            if ($body !== false) {

                // turn off libxml error handling

                $errors = libxml_use_internal_errors();

                $this->_document = new DOMDocument();

                if (!$this->_document->loadXML($body)) {

                    $this->_document = false;

                }

                // reset libxml error handling

                libxml_clear_errors();

                libxml_use_internal_errors($errors);

            } else {

                $this->_document = false;

            }

        }

        return $this->_document;

    }

    /**

     * Return the current set XML Namespace.

     *

     * @return string

     */

    public function getNamespace()

    {

        return $this->_xmlNamespace;

    }

    /**

     * Set a new XML Namespace

     *

     * @param string $namespace

     */

    public function setNamespace($namespace)

    {

        $this->_xmlNamespace = $namespace;

    }

}