FeedFormat.class.php

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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 
00015     abstract class FeedFormat extends Singleton
00016     {
00017         abstract public function getChannelWorker();
00018         abstract public function getItemWorker();
00019         abstract public function isAcceptable(SimpleXMLElement $xmlFeed);
00020         
00021         public function parse(SimpleXMLElement $xmlFeed)
00022         {
00023             $this->checkWorkers();
00024             
00025             return
00026                 $this->getChannelWorker()->
00027                     makeChannel($xmlFeed)->
00028                         setFeedItems(
00029                             $this->getItemWorker()->
00030                                 makeItems($xmlFeed)
00031                         );
00032         }
00033         
00034         public function toXml(FeedChannel $channel)
00035         {
00036             $this->checkWorkers();
00037             
00038             $itemsXml = null;
00039             $itemWorker = $this->getItemWorker();
00040             
00041             foreach ($channel->getFeedItems() as $feedItem)
00042                 $itemsXml .= $itemWorker->toXml($feedItem);
00043             
00044             return $this->getChannelWorker()->toXml($channel, $itemsXml);
00045         }
00046         
00047         private function checkWorkers()
00048         {
00049             if (!$this->getChannelWorker())
00050                 throw new WrongStateException(
00051                     'Setup channelWorker must be assigned'
00052                 );
00053             
00054             if (!$this->getItemWorker())
00055                 throw new WrongStateException(
00056                     'Setup itemWorker must be assigned'
00057                 );
00058             
00059             return $this;
00060         }
00061     }
00062 ?>