<?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: Feed.php 20096 2010-01-06 02:05:09Z bkarwin $

 */

/**

 * @see Zend_Feed_Reader_Extension_FeedAbstract

 */

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

/**

 * @see Zend_Date

 */

require_once 'Zend/Date.php';

/**

 * @see Zend_Feed_Reader_Collection_Author

 */

require_once 'Zend/Feed/Reader/Collection/Author.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_Extension_DublinCore_Feed

    extends Zend_Feed_Reader_Extension_FeedAbstract

{

    /**

     * 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 = array();

        $list    = $this->_xpath->query('//dc11:creator');

        if (!$list->length) {

            $list = $this->_xpath->query('//dc10:creator');

        }

        if (!$list->length) {

            $list = $this->_xpath->query('//dc11:publisher');

            if (!$list->length) {

                $list = $this->_xpath->query('//dc10:publisher');

            }

        }

        if ($list->length) {

            foreach ($list as $author) {

                $authors[] = array(

                    'name' => $author->nodeValue

                );

            }

            $authors = new Zend_Feed_Reader_Collection_Author(

                Zend_Feed_Reader::arrayUnique($authors)

            );

        } else {

            $authors = null;

        }

        $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 = null;

        $copyright = $this->_xpath->evaluate('string(' . $this->getXpathPrefix() . '/dc11:rights)');

        if (!$copyright) {

            $copyright = $this->_xpath->evaluate('string(' . $this->getXpathPrefix() . '/dc10:rights)');

        }

        if (!$copyright) {

            $copyright = null;

        }

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

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

    }

    /**

     * Get the feed description

     *

     * @return string|null

     */

    public function getDescription()

    {

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

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

        }

        $description = null;

        $description = $this->_xpath->evaluate('string(' . $this->getXpathPrefix() . '/dc11:description)');

        if (!$description) {

            $description = $this->_xpath->evaluate('string(' . $this->getXpathPrefix() . '/dc10:description)');

        }

        if (!$description) {

            $description = null;

        }

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

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

    }

    /**

     * Get the feed ID

     *

     * @return string|null

     */

    public function getId()

    {

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

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

        }

        $id = null;

        $id = $this->_xpath->evaluate('string(' . $this->getXpathPrefix() . '/dc11:identifier)');

        if (!$id) {

            $id = $this->_xpath->evaluate('string(' . $this->getXpathPrefix() . '/dc10:identifier)');

        }

        $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 = null;

        $language = $this->_xpath->evaluate('string(' . $this->getXpathPrefix() . '/dc11:language)');

        if (!$language) {

            $language = $this->_xpath->evaluate('string(' . $this->getXpathPrefix() . '/dc10:language)');

        }

        if (!$language) {

            $language = null;

        }

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

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

    }

    /**

     * Get the feed title

     *

     * @return string|null

     */

    public function getTitle()

    {

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

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

        }

        $title = null;

        $title = $this->_xpath->evaluate('string(' . $this->getXpathPrefix() . '/dc11:title)');

        if (!$title) {

            $title = $this->_xpath->evaluate('string(' . $this->getXpathPrefix() . '/dc10:title)');

        }

        if (!$title) {

            $title = null;

        }

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

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

    }

    /**

     *

     *

     * @return Zend_Date|null

     */

    public function getDate()

    {

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

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

        }

        $d = null;

        $date = $this->_xpath->evaluate('string(' . $this->getXpathPrefix() . '/dc11:date)');

        if (!$date) {

            $date = $this->_xpath->evaluate('string(' . $this->getXpathPrefix() . '/dc10:date)');

        }

        if ($date) {

            $d = new Zend_Date;

            $d->set($date, Zend_Date::ISO_8601);

        }

        $this->_data['date'] = $d;

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

    }

    /**

     * Get categories (subjects under DC)

     *

     * @return Zend_Feed_Reader_Collection_Category

     */

    public function getCategories()

    {

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

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

        }

        $list = $this->_xpath->evaluate($this->getXpathPrefix() . '//dc11:subject');

        if (!$list->length) {

            $list = $this->_xpath->evaluate($this->getXpathPrefix() . '//dc10:subject');

        }

        if ($list->length) {

            $categoryCollection = new Zend_Feed_Reader_Collection_Category;

            foreach ($list as $category) {

                $categoryCollection[] = array(

                    'term' => $category->nodeValue,

                    'scheme' => null,

                    'label' => $category->nodeValue,

                );

            }

        } else {

            $categoryCollection = new Zend_Feed_Reader_Collection_Category;

        }

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

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

    }

    /**

     * Register the default namespaces for the current feed format

     *

     * @return void

     */

    protected function _registerNamespaces()

    {

        $this->_xpath->registerNamespace('dc10', 'http://purl.org/dc/elements/1.0/');

        $this->_xpath->registerNamespace('dc11', 'http://purl.org/dc/elements/1.1/');

    }

}