<?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) 2005-2010 Zend Technologies USA Inc. (http://www.zend.com)

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

 * @version    $Id: Atom.php 22662 2010-07-24 17:37:36Z mabe $

 */

/**

 * @see Zend_Feed_Reader_FeedAbstract

 */

require_once 'Zend/Feed/Reader/FeedAbstract.php';

/**

 * @see Zend_Feed_Reader_Extension_Atom_Feed

 */

require_once 'Zend/Feed/Reader/Extension/Atom/Feed.php';

/**

 * @category   Zend

 * @package    Zend_Feed_Reader

 * @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_Feed_Reader_Feed_Atom extends Zend_Feed_Reader_FeedAbstract

{

    /**

     * Constructor

     *

     * @param  DOMDocument $dom

     * @param  string $type

     */

    public function __construct(DOMDocument $dom, $type = null)

    {

        parent::__construct($dom, $type);

        $atomClass = Zend_Feed_Reader::getPluginLoader()->getClassName('Atom_Feed');

        $this->_extensions['Atom_Feed'] = new $atomClass($dom, $this->_data['type'], $this->_xpath);

        $atomClass = Zend_Feed_Reader::getPluginLoader()->getClassName('DublinCore_Feed');

        $this->_extensions['DublinCore_Feed'] = new $atomClass($dom, $this->_data['type'], $this->_xpath);

        foreach ($this->_extensions as $extension) {

            $extension->setXpathPrefix('/atom:feed');

        }

    }

    /**

     * Get a single author

     *

     * @param  int $index

     * @return string|null

     */

    public function getAuthor($index = 0)

    {

        $authors = $this->getAuthors();

        if (isset($authors[$index])) {

            return $authors[$index];

        }

        return null;

    }

    /**

     * Get an array with feed authors

     *

     * @return array

     */

    public function getAuthors()

    {

        if (array_key_exists('authors', $this->_data)) {

            return $this->_data['authors'];

        }

        $authors = $this->getExtension('Atom')->getAuthors();

        $this->_data['authors'] = $authors;

        return $this->_data['authors'];

    }

    /**

     * Get the copyright entry

     *

     * @return string|null

     */

    public function getCopyright()

    {

        if (array_key_exists('copyright', $this->_data)) {

            return $this->_data['copyright'];

        }

        $copyright = $this->getExtension('Atom')->getCopyright();

        if (!$copyright) {

            $copyright = null;

        }

        $this->_data['copyright'] = $copyright;

        return $this->_data['copyright'];

    }

    /**

     * Get the feed creation date

     *

     * @return string|null

     */

    public function getDateCreated()

    {

        if (array_key_exists('datecreated', $this->_data)) {

            return $this->_data['datecreated'];

        }

        $dateCreated = $this->getExtension('Atom')->getDateCreated();

        if (!$dateCreated) {

            $dateCreated = null;

        }

        $this->_data['datecreated'] = $dateCreated;

        return $this->_data['datecreated'];

    }

    /**

     * Get the feed modification date

     *

     * @return string|null

     */

    public function getDateModified()

    {

        if (array_key_exists('datemodified', $this->_data)) {

            return $this->_data['datemodified'];

        }

        $dateModified = $this->getExtension('Atom')->getDateModified();

        if (!$dateModified) {

            $dateModified = null;

        }

        $this->_data['datemodified'] = $dateModified;

        return $this->_data['datemodified'];

    }

    /**

     * Get the feed lastBuild date. This is not implemented in Atom.

     *

     * @return string|null

     */

    public function getLastBuildDate()

    {

        return null;

    }

    /**

     * Get the feed description

     *

     * @return string|null

     */

    public function getDescription()

    {

        if (array_key_exists('description', $this->_data)) {

            return $this->_data['description'];

        }

        $description = $this->getExtension('Atom')->getDescription();

        if (!$description) {

            $description = null;

        }

        $this->_data['description'] = $description;

        return $this->_data['description'];

    }

    /**

     * Get the feed generator entry

     *

     * @return string|null

     */

    public function getGenerator()

    {

        if (array_key_exists('generator', $this->_data)) {

            return $this->_data['generator'];

        }

        $generator = $this->getExtension('Atom')->getGenerator();

        $this->_data['generator'] = $generator;

        return $this->_data['generator'];

    }

    /**

     * Get the feed ID

     *

     * @return string|null

     */

    public function getId()

    {

        if (array_key_exists('id', $this->_data)) {

            return $this->_data['id'];

        }

        $id = $this->getExtension('Atom')->getId();

        $this->_data['id'] = $id;

        return $this->_data['id'];

    }

    /**

     * Get the feed language

     *

     * @return string|null

     */

    public function getLanguage()

    {

        if (array_key_exists('language', $this->_data)) {

            return $this->_data['language'];

        }

        $language = $this->getExtension('Atom')->getLanguage();

        if (!$language) {

            $language = $this->_xpath->evaluate('string(//@xml:lang[1])');

        }

        if (!$language) {

            $language = null;

        }

        $this->_data['language'] = $language;

        return $this->_data['language'];

    }

    /**

     * Get a link to the source website

     *

     * @return string|null

     */

    public function getBaseUrl()

    {

        if (array_key_exists('baseUrl', $this->_data)) {

            return $this->_data['baseUrl'];

        }

        $baseUrl = $this->getExtension('Atom')->getBaseUrl();

        $this->_data['baseUrl'] = $baseUrl;

        return $this->_data['baseUrl'];

    }

    /**

     * Get a link to the source website

     *

     * @return string|null

     */

    public function getLink()

    {

        if (array_key_exists('link', $this->_data)) {

            return $this->_data['link'];

        }

        $link = $this->getExtension('Atom')->getLink();

        $this->_data['link'] = $link;

        return $this->_data['link'];

    }

    /**

     * Get feed image data

     *

     * @return array|null

     */

    public function getImage()

    {

        if (array_key_exists('image', $this->_data)) {

            return $this->_data['image'];

        }

        $link = $this->getExtension('Atom')->getImage();

        $this->_data['image'] = $link;

        return $this->_data['image'];

    }

    /**

     * Get a link to the feed's XML Url

     *

     * @return string|null

     */

    public function getFeedLink()

    {

        if (array_key_exists('feedlink', $this->_data)) {

            return $this->_data['feedlink'];

        }

        $link = $this->getExtension('Atom')->getFeedLink();

        if ($link === null || empty($link)) {

            $link = $this->getOriginalSourceUri();

        }

        $this->_data['feedlink'] = $link;

        return $this->_data['feedlink'];

    }

    /**

     * Get the feed title

     *

     * @return string|null

     */

    public function getTitle()

    {

        if (array_key_exists('title', $this->_data)) {

            return $this->_data['title'];

        }

        $title = $this->getExtension('Atom')->getTitle();

        $this->_data['title'] = $title;

        return $this->_data['title'];

    }

    /**

     * Get an array of any supported Pusubhubbub endpoints

     *

     * @return array|null

     */

    public function getHubs()

    {

        if (array_key_exists('hubs', $this->_data)) {

            return $this->_data['hubs'];

        }

        $hubs = $this->getExtension('Atom')->getHubs();

        $this->_data['hubs'] = $hubs;

        return $this->_data['hubs'];

    }

    /**

     * Get all categories

     *

     * @return Zend_Feed_Reader_Collection_Category

     */

    public function getCategories()

    {

        if (array_key_exists('categories', $this->_data)) {

            return $this->_data['categories'];

        }

        $categoryCollection = $this->getExtension('Atom')->getCategories();

        if (count($categoryCollection) == 0) {

            $categoryCollection = $this->getExtension('DublinCore')->getCategories();

        }

        $this->_data['categories'] = $categoryCollection;

        return $this->_data['categories'];

    }

    /**

     * Read all entries to the internal entries array

     *

     * @return void

     */

    protected function _indexEntries()

    {

        if ($this->getType() == Zend_Feed_Reader::TYPE_ATOM_10 ||

            $this->getType() == Zend_Feed_Reader::TYPE_ATOM_03) {

            $entries = array();

            $entries = $this->_xpath->evaluate('//atom:entry');

            foreach($entries as $index=>$entry) {

                $this->_entries[$index] = $entry;

            }

        }

    }

    /**

     * Register the default namespaces for the current feed format

     *

     */

    protected function _registerNamespaces()

    {

        switch ($this->_data['type']) {

            case Zend_Feed_Reader::TYPE_ATOM_03:

                $this->_xpath->registerNamespace('atom', Zend_Feed_Reader::NAMESPACE_ATOM_03);

                break;

            case Zend_Feed_Reader::TYPE_ATOM_10:

            default:

                $this->_xpath->registerNamespace('atom', Zend_Feed_Reader::NAMESPACE_ATOM_10);

        }

    }

}