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 <?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) 2005-2015 Zend Technologies USA Inc. (http://www.zend.com)
  * @license    http://framework.zend.com/license/new-bsd     New BSD License
  * @version    $Id$
  */
 
 /**
  * @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) 2005-2015 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/');
     }
 }