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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_Service
  * @subpackage Delicious
  * @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    $Id$
  */
 
 
 /**
  * List of posts retrived from the del.icio.us web service
  *
  * @category   Zend
  * @package    Zend_Service
  * @subpackage Delicious
  * @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_Service_Delicious_PostList implements Countable, Iterator, ArrayAccess
 {
     /**
      * @var array Array of Zend_Service_Delicious_Post
      */
     protected $_posts = array();
 
     /**
      * @var Zend_Service_Delicious Service that has downloaded the post list
      */
     protected $_service;
 
     /**
      * @var int Iterator key
      */
     protected $_iteratorKey = 0;
 
     /**
      * @param  Zend_Service_Delicious $service Service that has downloaded the post
      * @param  DOMNodeList|array      $posts
      * @return void
      */
     public function __construct(Zend_Service_Delicious $service, $posts = null)
     {
         $this->_service = $service;
         if ($posts instanceof DOMNodeList) {
             $this->_constructFromNodeList($posts);
         } else if (is_array($posts)) {
             $this->_constructFromArray($posts);
         }
     }
 
     /**
      * Transforms DOMNodeList to array of posts
      *
      * @param  DOMNodeList $nodeList
      * @return void
      */
     private function _constructFromNodeList(DOMNodeList $nodeList)
     {
         for ($i = 0; $i < $nodeList->length; $i++) {
             $curentNode = $nodeList->item($i);
             if($curentNode->nodeName == 'post') {
                 $this->_addPost(new Zend_Service_Delicious_Post($this->_service, $curentNode));
             }
         }
     }
 
     /**
      * Transforms the Array to array of posts
      *
      * @param  array $postList
      * @return void
      */
     private function _constructFromArray(array $postList)
     {
         foreach ($postList as $f_post) {
             $this->_addPost(new Zend_Service_Delicious_SimplePost($f_post));
         }
     }
 
     /**
      * Add a post
      *
      * @param  Zend_Service_Delicious_SimplePost $post
      * @return Zend_Service_Delicious_PostList
      */
     protected function _addPost(Zend_Service_Delicious_SimplePost $post)
     {
         $this->_posts[] = $post;
 
         return $this;
     }
 
     /**
      * Filter list by list of tags
      *
      * @param  array $tags
      * @return Zend_Service_Delicious_PostList
      */
     public function withTags(array $tags)
     {
         $postList = new self($this->_service);
 
         foreach ($this->_posts as $post) {
             if (count(array_diff($tags, $post->getTags())) == 0) {
                 $postList->_addPost($post);
             }
         }
 
         return $postList;
     }
 
     /**
      * Filter list by tag
      *
      * @param  string $tag
      * @return Zend_Service_Delicious_PostList
      */
     public function withTag($tag)
     {
         return $this->withTags(func_get_args());
     }
 
     /**
      * Filter list by urls matching a regular expression
      *
      * @param  string $regexp
      * @return Zend_Service_Delicious_PostList
      */
     public function withUrl($regexp)
     {
         $postList = new self($this->_service);
 
         foreach ($this->_posts as $post) {
             if (preg_match($regexp, $post->getUrl())) {
                 $postList->_addPost($post);
             }
         }
 
         return $postList;
     }
 
     /**
      * Return number of posts
      *
      * Implement Countable::count()
      *
      * @return int
      */
     public function count()
     {
         return count($this->_posts);
     }
 
     /**
      * Return the current element
      *
      * Implement Iterator::current()
      *
      * @return Zend_Service_Delicious_SimplePost
      */
     public function current()
     {
         return $this->_posts[$this->_iteratorKey];
     }
 
     /**
      * Return the key of the current element
      *
      * Implement Iterator::key()
      *
      * @return int
      */
     public function key()
     {
         return $this->_iteratorKey;
     }
 
     /**
      * Move forward to next element
      *
      * Implement Iterator::next()
      *
      * @return void
      */
     public function next()
     {
         $this->_iteratorKey += 1;
     }
 
     /**
      * Rewind the Iterator to the first element
      *
      * Implement Iterator::rewind()
      *
      * @return void
      */
     public function rewind()
     {
         $this->_iteratorKey = 0;
     }
 
     /**
      * Check if there is a current element after calls to rewind() or next()
      *
      * Implement Iterator::valid()
      *
      * @return bool
      */
     public function valid()
     {
         $numItems = $this->count();
 
         if ($numItems > 0 && $this->_iteratorKey < $numItems) {
             return true;
         } else {
             return false;
         }
     }
 
     /**
      * Whether the offset exists
      *
      * Implement ArrayAccess::offsetExists()
      *
      * @param   int     $offset
      * @return  bool
      */
     public function offsetExists($offset)
     {
         return ($offset < $this->count());
     }
 
     /**
      * Return value at given offset
      *
      * Implement ArrayAccess::offsetGet()
      *
      * @param   int     $offset
      * @throws  OutOfBoundsException
      * @return  Zend_Service_Delicious_SimplePost
      */
     public function offsetGet($offset)
     {
         if ($this->offsetExists($offset)) {
             return $this->_posts[$offset];
         } else {
             throw new OutOfBoundsException('Illegal index');
         }
     }
 
     /**
      * Throws exception because all values are read-only
      *
      * Implement ArrayAccess::offsetSet()
      *
      * @param   int     $offset
      * @param   string  $value
      * @throws  Zend_Service_Delicious_Exception
      */
     public function offsetSet($offset, $value)
     {
         /**
          * @see Zend_Service_Delicious_Exception
          */
         // require_once 'Zend/Service/Delicious/Exception.php';
         throw new Zend_Service_Delicious_Exception('You are trying to set read-only property');
     }
 
     /**
      * Throws exception because all values are read-only
      *
      * Implement ArrayAccess::offsetUnset()
      *
      * @param   int     $offset
      * @throws  Zend_Service_Delicious_Exception
      */
     public function offsetUnset($offset)
     {
         /**
          * @see Zend_Service_Delicious_Exception
          */
         // require_once 'Zend/Service/Delicious/Exception.php';
         throw new Zend_Service_Delicious_Exception('You are trying to unset read-only property');
     }
 }