9.5/_prerequisite_collection_8php_source.html

<?php

declare(strict_types = 1);

namespace ‪TYPO3\CMS\Install\Updates;


/*

 * 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!

 */


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;

    }

}