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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\Core\DataHandling\Model;
/**
* An EntityPointerLink is used to connect EntityPointer instances
*/
class EntityPointerLink
{
/**
* @var EntityPointer
*/
protected $subject;
/**
* @var EntityPointerLink|null
*/
protected $ancestor;
public function __construct(EntityPointer $subject)
{
$this->subject = $subject;
}
public function getSubject(): EntityPointer
{
return $this->subject;
}
public function getHead(): EntityPointerLink
{
$head = $this;
while ($head->ancestor !== null) {
$head = $head->ancestor;
}
return $head;
}
public function getAncestor(): ?EntityPointerLink
{
return $this->ancestor;
}
public function withAncestor(EntityPointerLink $ancestor): self
{
if ($this->ancestor === $ancestor) {
return $this;
}
$target = clone $this;
$target->ancestor = $ancestor;
return $target;
}
}