<?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_Feed_Reader

 * @copyright  Copyright (c) 2005-2012 Zend Technologies USA Inc. (http://www.zend.com)

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

 * @version    $Id: FeedSet.php 24593 2012-01-05 20:35:02Z matthew $

 */

/**

 * @see Zend_Feed_Reader

 */

require_once 'Zend/Feed/Reader.php';

/**

 * @see Zend_Uri

 */

require_once 'Zend/Uri.php';

/**

 * @category   Zend

 * @package    Zend_Feed_Reader

 * @copyright  Copyright (c) 2005-2012 Zend Technologies USA Inc. (http://www.zend.com)

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

 */

class Zend_Feed_Reader_FeedSet extends ArrayObject

{

    public $rss = null;

    public $rdf = null;

    public $atom = null;

    /**

     * Import a DOMNodeList from any document containing a set of links

     * for alternate versions of a document, which will normally refer to

     * RSS/RDF/Atom feeds for the current document.

     *

     * All such links are stored internally, however the first instance of

     * each RSS, RDF or Atom type has its URI stored as a public property

     * as a shortcut where the use case is simply to get a quick feed ref.

     *

     * Note that feeds are not loaded at this point, but will be lazy

     * loaded automatically when each links 'feed' array key is accessed.

     *

     * @param DOMNodeList $links

     * @param string $uri

     * @return void

     */

    public function addLinks(DOMNodeList $links, $uri)

    {

        foreach ($links as $link) {

            if (strtolower($link->getAttribute('rel')) !== 'alternate'

                || !$link->getAttribute('type') || !$link->getAttribute('href')) {

                continue;

            }

            if (!isset($this->rss) && $link->getAttribute('type') == 'application/rss+xml') {

                $this->rss = $this->_absolutiseUri(trim($link->getAttribute('href')), $uri);

            } elseif(!isset($this->atom) && $link->getAttribute('type') == 'application/atom+xml') {

                $this->atom = $this->_absolutiseUri(trim($link->getAttribute('href')), $uri);

            } elseif(!isset($this->rdf) && $link->getAttribute('type') == 'application/rdf+xml') {

                $this->rdf = $this->_absolutiseUri(trim($link->getAttribute('href')), $uri);

            }

            $this[] = new self(array(

                'rel' => 'alternate',

                'type' => $link->getAttribute('type'),

                'href' => $this->_absolutiseUri(trim($link->getAttribute('href')), $uri),

            ));

        }

    }

    /**

     *  Attempt to turn a relative URI into an absolute URI

     */

    protected function _absolutiseUri($link, $uri = null)

    {

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

            if ($uri !== null) {

                $uri = Zend_Uri::factory($uri);

                if ($link[0] !== '/') {

                    $link = $uri->getPath() . '/' . $link;

                }

                $link = $uri->getScheme() . '://' . $uri->getHost() . '/' . $this->_canonicalizePath($link);

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

                    $link = null;

                }

            }

        }

        return $link;

    }

    /**

     *  Canonicalize relative path

     */

    protected function _canonicalizePath($path)

    {

        $parts = array_filter(explode('/', $path));

        $absolutes = array();

        foreach ($parts as $part) {

            if ('.' == $part) {

                continue;

            }

            if ('..' == $part) {

                array_pop($absolutes);

            } else {

                $absolutes[] = $part;

            }

        }

        return implode('/', $absolutes);

    }

    /**

     * Supports lazy loading of feeds using Zend_Feed_Reader::import() but

     * delegates any other operations to the parent class.

     *

     * @param string $offset

     * @return mixed

     * @uses Zend_Feed_Reader

     */

    public function offsetGet($offset)

    {

        if ($offset == 'feed' && !$this->offsetExists('feed')) {

            if (!$this->offsetExists('href')) {

                return null;

            }

            $feed = Zend_Feed_Reader::import($this->offsetGet('href'));

            $this->offsetSet('feed', $feed);

            return $feed;

        }

        return parent::offsetGet($offset);

    }

}