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<?php
/*
* Copyright 2015-present MongoDB, Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* https://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
namespace MongoDB\Model;
use IteratorIterator;
use Traversable;
use function array_key_exists;
/**
* IndexInfoIterator for both listIndexes command and legacy query results.
*
* This common iterator may be used to wrap a Cursor returned by both the
* listIndexes command and, for legacy servers, queries on the "system.indexes"
* collection.
*
* @internal
* @see \MongoDB\Collection::listIndexes()
* @see https://github.com/mongodb/specifications/blob/master/source/enumerate-indexes.rst
* @see https://mongodb.com/docs/manual/reference/command/listIndexes/
* @see https://mongodb.com/docs/manual/reference/system-collections/
*/
class IndexInfoIteratorIterator extends IteratorIterator implements IndexInfoIterator
{
/** @var string|null $ns */
private $ns;
public function __construct(Traversable $iterator, ?string $ns = null)
{
parent::__construct($iterator);
$this->ns = $ns;
}
/**
* Return the current element as an IndexInfo instance.
*
* @see IndexInfoIterator::current()
* @see https://php.net/iterator.current
*/
public function current(): IndexInfo
{
$info = parent::current();
if (! array_key_exists('ns', $info) && $this->ns !== null) {
$info['ns'] = $this->ns;
}
return new IndexInfo($info);
}
}
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