StorageFactory.php

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<?php
namespace TYPO3\CMS\Rsaauth\Storage;

/*
 * 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!
 */

class StorageFactory
{
    protected static $preferredStorage = \TYPO3\CMS\Rsaauth\Storage\SplitStorage::class;

    protected static $storageInstance = null;

    public static function getStorage()
    {
        if (self::$storageInstance === null) {
            self::$storageInstance = \TYPO3\CMS\Core\Utility\GeneralUtility::getUserObj(self::$preferredStorage);
        }
        return self::$storageInstance;
    }

    public static function setPreferredStorage($preferredStorage)
    {
        self::$preferredStorage = $preferredStorage;
    }
}