DependencyEntityFactory.php

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<?php
namespace TYPO3\CMS\Version\Dependency;

/*
 * 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 DependencyEntityFactory
{
    protected $elements = [];

    protected $references = [];

    public function getElement($table, $id, array $data = [], \TYPO3\CMS\Version\Dependency\DependencyResolver $dependency)
    {
        $element = \TYPO3\CMS\Core\Utility\GeneralUtility::makeInstance(\TYPO3\CMS\Version\Dependency\ElementEntity::class, $table, $id, $data, $dependency);
        $elementName = $element->__toString();
        if (!isset($this->elements[$elementName])) {
            $this->elements[$elementName] = $element;
        }
        return $this->elements[$elementName];
    }

    public function getReference(\TYPO3\CMS\Version\Dependency\ElementEntity $element, $field)
    {
        $referenceName = $element->__toString() . '.' . $field;
        if (!isset($this->references[$referenceName][$field])) {
            $this->references[$referenceName][$field] = \TYPO3\CMS\Core\Utility\GeneralUtility::makeInstance(\TYPO3\CMS\Version\Dependency\ReferenceEntity::class, $element, $field);
        }
        return $this->references[$referenceName][$field];
    }

    public function getReferencedElement($table, $id, $field, array $data = [], \TYPO3\CMS\Version\Dependency\DependencyResolver $dependency)
    {
        return $this->getReference($this->getElement($table, $id, $data, $dependency), $field);
    }
}