# 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 ?>