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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_Extension_EntryAbstract
 {
     /**
      * Feed entry data
      *
      * @var array
      */
     protected $_data = array();
 
     /**
      * DOM document object
      *
      * @var DOMDocument
      */
     protected $_domDocument = null;
 
     /**
      * Entry instance
      *
      * @var Zend_Feed_Entry_Abstract
      */
     protected $_entry = null;
 
     /**
      * Pointer to the current entry
      *
      * @var int
      */
     protected $_entryKey = 0;
 
     /**
      * XPath object
      *
      * @var DOMXPath
      */
     protected $_xpath = null;
 
     /**
      * XPath query
      *
      * @var string
      */
     protected $_xpathPrefix = '';
 
     /**
      * Constructor
      *
      * @param  Zend_Feed_Entry_Abstract $entry
      * @param  int $entryKey
      * @param  string $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 {
             $this->_data['type'] = Zend_Feed_Reader::detectType($entry->ownerDocument, true);
         }
         // set the XPath query prefix for the entry being queried
         if ($this->getType() == Zend_Feed_Reader::TYPE_RSS_10
             || $this->getType() == Zend_Feed_Reader::TYPE_RSS_090
         ) {
             $this->setXpathPrefix('//rss:item[' . ($this->_entryKey+1) . ']');
         } elseif ($this->getType() == Zend_Feed_Reader::TYPE_ATOM_10
                   || $this->getType() == Zend_Feed_Reader::TYPE_ATOM_03
         ) {
             $this->setXpathPrefix('//atom:entry[' . ($this->_entryKey+1) . ']');
         } else {
             $this->setXpathPrefix('//item[' . ($this->_entryKey+1) . ']');
         }
     }
 
     /**
      * Get the DOM
      *
      * @return DOMDocument
      */
     public function getDomDocument()
     {
         return $this->_domDocument;
     }
 
     /**
      * Get the Entry's encoding
      *
      * @return string
      */
     public function getEncoding()
     {
         $assumed = $this->getDomDocument()->encoding;
         return $assumed;
     }
 
     /**
      * Get the entry type
      *
      * @return string
      */
     public function getType()
     {
         return $this->_data['type'];
     }
 
     /**
      * Set the XPath query
      *
      * @param  DOMXPath $xpath
      * @return Zend_Feed_Reader_Extension_EntryAbstract
      */
     public function setXpath(DOMXPath $xpath)
     {
         $this->_xpath = $xpath;
         $this->_registerNamespaces();
         return $this;
     }
 
     /**
      * Get the XPath query object
      *
      * @return DOMXPath
      */
     public function getXpath()
     {
         if (!$this->_xpath) {
             $this->setXpath(new DOMXPath($this->getDomDocument()));
         }
         return $this->_xpath;
     }
 
     /**
      * Serialize the entry to an array
      *
      * @return array
      */
     public function toArray()
     {
         return $this->_data;
     }
 
     /**
      * Get the XPath prefix
      *
      * @return string
      */
     public function getXpathPrefix()
     {
         return $this->_xpathPrefix;
     }
 
     /**
      * Set the XPath prefix
      *
      * @param  string $prefix
      * @return Zend_Feed_Reader_Extension_EntryAbstract
      */
     public function setXpathPrefix($prefix)
     {
         $this->_xpathPrefix = $prefix;
         return $this;
     }
 
     /**
      * Register XML namespaces
      *
      * @return void
      */
     protected abstract function _registerNamespaces();
 }