69 lines
1.5 KiB
PHP
69 lines
1.5 KiB
PHP
<?php
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declare(strict_types=1);
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/*
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* This file is part of the TYPO3 CMS project.
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*
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* It is free software; you can redistribute it and/or modify it under
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* the terms of the GNU General Public License, either version 2
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* of the License, or any later version.
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*
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* For the full copyright and license information, please read the
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* LICENSE.txt file that was distributed with this source code.
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*
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* The TYPO3 project - inspiring people to share!
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*/
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namespace TYPO3\CMS\Core\DataHandling\Model;
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/**
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* An EntityPointerLink is used to connect EntityPointer instances
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*/
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class EntityPointerLink
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{
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/**
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* @var EntityPointer
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*/
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protected $subject;
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/**
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* @var EntityPointerLink|null
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*/
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protected $ancestor;
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public function __construct(EntityPointer $subject)
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{
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$this->subject = $subject;
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}
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public function getSubject(): EntityPointer
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{
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return $this->subject;
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}
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public function getHead(): EntityPointerLink
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{
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$head = $this;
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while ($head->ancestor !== null) {
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$head = $head->ancestor;
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}
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return $head;
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}
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public function getAncestor(): ?EntityPointerLink
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{
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return $this->ancestor;
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}
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public function withAncestor(EntityPointerLink $ancestor): self
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{
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if ($this->ancestor === $ancestor) {
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return $this;
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}
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$target = clone $this;
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$target->ancestor = $ancestor;
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return $target;
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}
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}
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