PrerequisiteCollection.php

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<?php
 
declare(strict_types=1);
 
/*
 * 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!
 */
 
namespace ‪TYPO3\CMS\Install\Updates;
 
use ‪TYPO3\CMS\Core\Utility\GeneralUtility;
 
class ‪PrerequisiteCollection implements \IteratorAggregate
{
    protected ‪$prerequisites;
 
    public function ‪__construct()
    {
        $this->prerequisites = new \ArrayObject();
    }
 
    public function ‪add(string $prerequisiteClass): void
    {
        if (
            !($this->prerequisites[$prerequisiteClass] ?? false)
            && is_a($prerequisiteClass, PrerequisiteInterface::class, true)
        ) {
            $this->prerequisites[$prerequisiteClass] = GeneralUtility::makeInstance(
                $prerequisiteClass
            );
        }
    }
 
    public function ‪getIterator()
    {
        return ‪$this->prerequisites;
    }
}