# FeedReader.class.php

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    00001 <?php
    00002 /***************************************************************************
    00003  *   Copyright (C) 2007 by Dmitry E. Pismenny, Dmitry A. Lomash            *
    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     final class FeedReader
    00016     {
    00017         private $xml            = null;
    00018         private $formats        = array();
    00019
    00023         public static function create()
    00024         {
    00025             return new self;
    00026         }
    00027
    00028         public function __construct()
    00029         {
    00030             $this->formats[] = YandexRssFeedFormat::me();
    00031             $this->formats[] = AtomFeedFormat::me();
    00032             $this->formats[] = RssFeedFormat::me();
    00033         }
    00034
    00038         public function getXml()
    00039         {
    00040             return $this->xml;
    00041         }
    00042
    00046         public function parseFile($file)
    00047         {
    00048             try {
    00049                 $this->xml = simplexml_load_file($file);
    00050             } catch (BaseException $e) {
    00051                 throw new WrongArgumentException(
    00052                     'Invalid link or content: '.$e->getMessage()
    00053                 );
    00054             }
    00055
    00056             if (!$this->xml)
    00057                 throw new WrongStateException('simplexml_load_file failed.');
    00058
    00059             return $this->parse();
    00060         }
    00061
    00065         public function parseXml($xml)
    00066         {
    00067             $this->xml = new SimpleXMLElement($xml);
    00068
    00069             return $this->parse();
    00070         }
    00071
    00075         private function parse()
    00076         {
    00077             foreach ($this->formats as $format)
    00078                 if ($format->isAcceptable($this->xml))
    00079                     return $format->parse($this->xml);
    00080
    00081             throw new WrongStateException(
    00082                 'you\'re using unsupported format of feed'
    00083             );
    00084         }
    00085     }
    00086 ?>