SplDoublyLinkedListFilter.php
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SplDoublyLinkedListFilter.php
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	<?php

	namespace DeepCopy\TypeFilter\Spl;

	use Closure;
	use DeepCopy\DeepCopy;
	use DeepCopy\TypeFilter\TypeFilter;
	use SplDoublyLinkedList;

	/**
	* @final
	*/
	class SplDoublyLinkedListFilter implements TypeFilter
	{
	private $copier;

	public function __construct(DeepCopy $copier)
	{
	$this->copier = $copier;
	}

	/**
	* {@inheritdoc}
	*/
	public function apply($element)
	{
	$newElement = clone $element;

	$copy = $this->createCopyClosure();

	return $copy($newElement);
	}

	private function createCopyClosure()
	{
	$copier = $this->copier;

	$copy = function (SplDoublyLinkedList $list) use ($copier) {
	// Replace each element in the list with a deep copy of itself
	for ($i = 1; $i <= $list->count(); $i++) {
	$copy = $copier->recursiveCopy($list->shift());

	$list->push($copy);
	}

	return $list;
	};

	return Closure::bind($copy, null, DeepCopy::class);
	}
	}