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<?php
declare(strict_types=1);
/**
* SPDX-FileCopyrightText: 2018 Nextcloud GmbH and Nextcloud contributors
* SPDX-License-Identifier: AGPL-3.0-or-later
*/
namespace OCA\DAV\Paginate;
/**
* Save a copy of the first X items into a separate iterator
*
* This allows us to pass the iterator to the cache while keeping a copy
* of the required items.
*
* @extends \AppendIterator<int, int, \Iterator<int, int>>
*/
class LimitedCopyIterator extends \AppendIterator {
private array $skipped = [];
private array $copy = [];
public function __construct(\Traversable $iterator, int $count, int $offset = 0) {
parent::__construct();
if (!$iterator instanceof \Iterator) {
$iterator = new \IteratorIterator($iterator);
}
$iterator = new \NoRewindIterator($iterator);
$i = 0;
while ($iterator->valid() && ++$i <= $offset) {
$this->skipped[] = $iterator->current();
$iterator->next();
}
while ($iterator->valid() && count($this->copy) < $count) {
$this->copy[] = $iterator->current();
$iterator->next();
}
$this->append(new \ArrayIterator($this->skipped));
$this->append($this->getRequestedItems());
$this->append($iterator);
}
public function getRequestedItems(): \Iterator {
return new \ArrayIterator($this->copy);
}
}
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