00001 <?php 00002 /*************************************************************************** 00003 * Copyright (C) 2007 by Dmitry A. Lomash, Dmitry E. Demidov * 00004 * * 00005 * This program is free software; you can redistribute it and/or modify * 00006 * it under the terms of the GNU Lesser General Public License as * 00007 * published by the Free Software Foundation; either version 3 of the * 00008 * License, or (at your option) any later version. * 00009 * * 00010 ***************************************************************************/ 00011 /* $Id: FeedFormat.class.php 4687 2007-12-09 18:57:18Z voxus $ */ 00012 00016 abstract class FeedFormat extends Singleton 00017 { 00018 abstract public function getChannelWorker(); 00019 abstract public function getItemWorker(); 00020 abstract public function isAcceptable(SimpleXMLElement $xmlFeed); 00021 00022 public function parse(SimpleXMLElement $xmlFeed) 00023 { 00024 $this->checkWorkers(); 00025 00026 return 00027 $this->getChannelWorker()-> 00028 makeChannel($xmlFeed)-> 00029 setFeedItems( 00030 $this->getItemWorker()-> 00031 makeItems($xmlFeed) 00032 ); 00033 } 00034 00035 public function toXml(FeedChannel $channel) 00036 { 00037 $this->checkWorkers(); 00038 00039 $itemsXml = null; 00040 $itemWorker = $this->getItemWorker(); 00041 00042 foreach ($channel->getFeedItems() as $feedItem) 00043 $itemsXml .= $itemWorker->toXml($feedItem); 00044 00045 return $this->getChannelWorker()->toXml($channel, $itemsXml); 00046 } 00047 00048 private function checkWorkers() 00049 { 00050 if (!$this->getChannelWorker()) 00051 throw new WrongStateException( 00052 'Setup channelWorker must be assigned' 00053 ); 00054 00055 if (!$this->getItemWorker()) 00056 throw new WrongStateException( 00057 'Setup itemWorker must be assigned' 00058 ); 00059 00060 return $this; 00061 } 00062 } 00063 ?>