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

 */

/**

 * @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

 */

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 $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 {

            $this->_data['type'] = Zend_Feed_Reader::detectType($feed);

        }

        $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']

            );

        }

    }

}