class.tx_em_parser_mirrorxmlpullparser.php

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<?php
/***************************************************************
 *  Copyright notice
 *
 *  (c) 2010 Marcus Krause <marcus#exp2010@t3sec.info>
 *         Steffen Kamper <info@sk-typo3.de>
 *  All rights reserved
 *
 *  This script is part of the TYPO3 project. The TYPO3 project is
 *  free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  The GNU General Public License can be found at
 *  http://www.gnu.org/copyleft/gpl.html.
 *
 *  This script is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  This copyright notice MUST APPEAR in all copies of the script!
 ***************************************************************/
/**
 * class.tx_em_parser_mirrorxmlpullparser.php
 *
 * Module: Extension manager - mirrors.xml pull-parser
 *
 * $Id: class.tx_em_parser_mirrorxmlpullparser.php 1913 2010-02-21 15:47:37Z mkrause $
 *
 * @author  Marcus Krause <marcus#exp2010@t3sec.info>
 * @author  Steffen Kamper <info@sk-typo3.de>
 */


/**
 * Parser for TYPO3's mirrors.xml file.
 *
 * Depends on PHP ext/xmlreader which should be available
 * with PHP >= 5.1.0.
 *
 * @author    Marcus Krause <marcus#exp2010@t3sec.info>
 * @author    Steffen Kamper <info@sk-typo3.de>
 *
 * @since      2010-02-19
 * @package  TYPO3
 * @subpackage  EM
 */
class tx_em_Parser_MirrorXmlPullParser extends tx_em_Parser_MirrorXmlAbstractParser implements SplSubject {


    /**
     * Keeps list of attached observers.
     *
     * @var  array
     */
    protected $observers = array();


    /**
     * Class constructor.
     *
     * @access  public
     * @return  void
     */
    function __construct() {
        $this->requiredPHPExt = 'xmlreader';

        if ($this->isAvailable()) {
            $this->objXML = new XMLReader();
        }
    }

    /**
     * Method parses an extensions.xml file.
     *
     * @access  public
     * @param   string  $file  file resource, typically a stream
     * @return  void
     * @throws  em_mirrorxml_Exception  in case of XML parser errors
     */
    public function parseXML($file) {
        if (!(is_object($this->objXML) && (get_class($this->objXML) == 'XMLReader'))) {
            $this->throwException('Unable to create XML parser.');
        }
        $this->objXML->open($file, 'utf-8') || $this->throwException(sprintf('Unable to open file ressource %s.', htmlspecialchars($file)));

        while ($this->objXML->read()) {

            if ($this->objXML->nodeType == XMLReader::ELEMENT) {
                $this->startElement($this->objXML->name);
            } else {
                if ($this->objXML->nodeType == XMLReader::END_ELEMENT) {
                    $this->endElement($this->objXML->name);
                } else {
                    continue;
                }
            }
        }
        $this->objXML->close();
    }

    /**
     * Method is invoked when parser accesses start tag of an element.
     *
     * @access  protected
     * @param   string   $elementName  element name at parser's current position
     * @return  void
     * @see  endElement()
     */
    protected function startElement($elementName) {
        switch ($elementName) {
            case 'title':
                $this->title = $this->getElementValue($elementName);
                break;
            case 'host':
                $this->host = $this->getElementValue($elementName);
                break;
            case 'path':
                $this->path = $this->getElementValue($elementName);
                break;
            case 'country':
                $this->country = $this->getElementValue($elementName);
                break;
            case 'name':
                $this->sponsorname = $this->getElementValue($elementName);
                break;
            case 'link':
                $this->sponsorlink = $this->getElementValue($elementName);
                break;
            case 'logo':
                $this->sponsorlogo = $this->getElementValue($elementName);
                break;
        }
    }

    /**
     * Method is invoked when parser accesses end tag of an element.
     *
     * @access  protected
     * @param   string   $elementName  element name at parser's current position
     * @return  void
     * @see  startElement()
     */
    protected function endElement($elementName) {
        switch ($elementName) {
            case 'mirror':
                $this->notify();
                $this->resetProperties();
                break;
        }
    }

    /**
     * Method returns the value of an element at XMLReader's current
     * position.
     *
     * Method will read until it finds the end of the given element.
     * If element has no value, method returns NULL.
     *
     * @access  protected
     * @param   string   $elementName  name of element to retrieve it's value from
     * @return  string   an element's value if it has a value, otherwise NULL
     */
    protected function getElementValue(&$elementName) {
        $value = NULL;
        if (!$this->objXML->isEmptyElement) {
            $value = '';
            while ($this->objXML->read()) {
                if ($this->objXML->nodeType == XMLReader::TEXT
                        || $this->objXML->nodeType == XMLReader::CDATA
                        || $this->objXML->nodeType == XMLReader::WHITESPACE
                        || $this->objXML->nodeType == XMLReader::SIGNIFICANT_WHITESPACE) {
                    $value .= $this->objXML->value;
                } else {
                    if ($this->objXML->nodeType == XMLReader::END_ELEMENT
                            && $this->objXML->name === $elementName) {
                        break;
                    }
                }
            }
        }
        return $value;
    }

    /**
     * Method attaches an observer.
     *
     * @access  public
     * @param   SplObserver  $observer  an observer to attach
     * @return  void
     * @see  $observers, detach(), notify()
     */
    public function attach(SplObserver $observer) {
        $this->observers[] = $observer;
    }

    /**
     * Method detaches an attached observer
     *
     * @access  public
     * @param   SplObserver  $observer  an observer to detach
     * @return  void
     * @see  $observers, attach(), notify()
     */
    public function detach(SplObserver $observer) {
        $key = array_search($observer, $this->observers, true);
        if (!($key === false)) {
            unset($this->observers[$key]);
        }
    }

    /**
     * Method notifies attached observers.
     *
     * @access  public
     * @return  void
     * @see  $observers, attach(), detach()
     */
    public function notify() {
        foreach ($this->observers as $observer) {
            $observer->update($this);
        }
    }
}

if (defined('TYPO3_MODE') && isset($GLOBALS['TYPO3_CONF_VARS'][TYPO3_MODE]['XCLASS']['typo3/sysext/em/classes/parser/class.tx_em_parser_mirrorxmlpullparser.php'])) {
    include_once($GLOBALS['TYPO3_CONF_VARS'][TYPO3_MODE]['XCLASS']['typo3/sysext/em/classes/parser/class.tx_em_parser_mirrorxmlpullparser.php']);
}

?>