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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    $Id$
  */
 
 /**
  * @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
  */
 abstract class Zend_Feed_Reader_EntryAbstract
 {
     /**
      * Feed entry data
      *
      * @var array
      */
     protected $_data = array();
 
     /**
      * DOM document object
      *
      * @var DOMDocument
      */
     protected $_domDocument = null;
 
     /**
      * Entry instance
      *
      * @var Zend_Feed_Entry_Interface
      */
     protected $_entry = null;
 
     /**
      * Pointer to the current entry
      *
      * @var int
      */
     protected $_entryKey = 0;
 
     /**
      * XPath object
      *
      * @var DOMXPath
      */
     protected $_xpath = null;
 
     /**
      * Registered extensions
      *
      * @var array
      */
     protected $_extensions = array();
 
     /**
      * Constructor
      *
      * @param  DOMElement  $entry
      * @param  int         $entryKey
      * @param  string|null $type
      * @return void
      */
     public function __construct(DOMElement $entry, $entryKey, $type = null)
     {
         $this->_entry       = $entry;
         $this->_entryKey    = $entryKey;
         $this->_domDocument = $entry->ownerDocument;
         if ($type !== null) {
             $this->_data['type'] = $type;
         } else {
             $this->_data['type'] = Zend_Feed_Reader::detectType(
                 $this->_domDocument
             );
         }
         $this->_loadExtensions();
     }
 
     /**
      * Get the DOM
      *
      * @return DOMDocument
      */
     public function getDomDocument()
     {
         return $this->_domDocument;
     }
 
     /**
      * Get the entry element
      *
      * @return DOMElement
      */
     public function getElement()
     {
         return $this->_entry;
     }
 
     /**
      * Get the Entry's encoding
      *
      * @return string
      */
     public function getEncoding()
     {
         $assumed = $this->getDomDocument()->encoding;
         if (empty($assumed)) {
             $assumed = 'UTF-8';
         }
         return $assumed;
     }
 
     /**
      * Get entry as xml
      *
      * @return string
      */
     public function saveXml()
     {
         $dom = new DOMDocument('1.0', $this->getEncoding());
         $entry = $dom->importNode($this->getElement(), true);
         $dom->appendChild($entry);
         return $dom->saveXml();
     }
 
     /**
      * Get the entry type
      *
      * @return string
      */
     public function getType()
     {
         return $this->_data['type'];
     }
 
     /**
      * Get the XPath query object
      *
      * @return DOMXPath
      */
     public function getXpath()
     {
         if (!$this->_xpath) {
             $this->setXpath(new DOMXPath($this->getDomDocument()));
         }
         return $this->_xpath;
     }
 
     /**
      * Set the XPath query
      *
      * @param  DOMXPath $xpath
      * @return Zend_Feed_Reader_Entry_EntryAbstract
      */
     public function setXpath(DOMXPath $xpath)
     {
         $this->_xpath = $xpath;
         return $this;
     }
 
     /**
      * Get registered extensions
      *
      * @return array
      */
     public function getExtensions()
     {
         return $this->_extensions;
     }
 
     /**
      * Return an Extension object with the matching name (postfixed with _Entry)
      *
      * @param string $name
      * @return Zend_Feed_Reader_Extension_EntryAbstract
      */
     public function getExtension($name)
     {
         if (array_key_exists($name . '_Entry', $this->_extensions)) {
             return $this->_extensions[$name . '_Entry'];
         }
         return null;
     }
 
     /**
      * Method overloading: call given method on first extension implementing it
      *
      * @param  string $method
      * @param  array $args
      * @return mixed
      * @throws Zend_Feed_Exception if no extensions implements the method
      */
     public function __call($method, $args)
     {
         foreach ($this->_extensions as $extension) {
             if (method_exists($extension, $method)) {
                 return call_user_func_array(array($extension, $method), $args);
             }
         }
         // require_once 'Zend/Feed/Exception.php';
         throw new Zend_Feed_Exception(
             'Method: ' . $method
             . 'does not exist and could not be located on a registered Extension'
         );
     }
 
     /**
      * Load extensions from Zend_Feed_Reader
      *
      * @return void
      */
     protected function _loadExtensions()
     {
         $all = Zend_Feed_Reader::getExtensions();
         $feed = $all['entry'];
         foreach ($feed as $extension) {
             if (in_array($extension, $all['core'])) {
                 continue;
             }
             $className = Zend_Feed_Reader::getPluginLoader()->getClassName($extension);
             $this->_extensions[$extension] = new $className(
                 $this->getElement(), $this->_entryKey, $this->_data['type']
             );
         }
     }
 }