extensionmanager/Classes/Utility/Parser/AbstractXmlParser.php

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<?php
namespace TYPO3\CMS\Extensionmanager\Utility\Parser;

/*
 * This file is part of the TYPO3 CMS project.
 *
 * It is free software; you can redistribute it and/or modify it under
 * the terms of the GNU General Public License, either version 2
 * of the License, or any later version.
 *
 * For the full copyright and license information, please read the
 * LICENSE.txt file that was distributed with this source code.
 *
 * The TYPO3 project - inspiring people to share!
 */

abstract class AbstractXmlParser implements \SplSubject
{
    protected $objXml;

    protected $requiredPhpExtensions;

    protected $observers = array();

    public function attach(\SplObserver $observer)
    {
        $this->observers[] = $observer;
    }

    public function detach(\SplObserver $observer)
    {
        $key = array_search($observer, $this->observers, true);
        if ($key !== false) {
            unset($this->observers[$key]);
        }
    }

    public function notify()
    {
        foreach ($this->observers as $observer) {
            $observer->update($this);
        }
    }

    public function isAvailable()
    {
        $isAvailable = true;
        if (!extension_loaded($this->requiredPhpExtensions)) {
            $prefix = PHP_SHLIB_SUFFIX === 'dll' ? 'php_' : '';
            if (!(((bool)ini_get('enable_dl') && !(bool)ini_get('safe_mode')) && function_exists('dl') && dl($prefix . $this->requiredPhpExtensions . PHP_SHLIB_SUFFIX))) {
                $isAvailable = false;
            }
        }
        return $isAvailable;
    }

    abstract public function parseXml($file);

    abstract protected function createParser();
}