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<?php
/*
* Copyright 2017 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
*
* http://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;
use IteratorAggregate;
use stdClass;
use Traversable;
use function call_user_func;
/**
* Result class for mapReduce command results.
*
* This class allows for iteration of mapReduce results irrespective of the
* output method (e.g. inline, collection) via the IteratorAggregate interface.
* It also provides access to command statistics.
*
* @api
* @see \MongoDB\Collection::mapReduce()
* @see https://docs.mongodb.com/manual/reference/command/mapReduce/
*/
class MapReduceResult implements IteratorAggregate
{
/** @var callable */
private $getIterator;
/** @var integer */
private $executionTimeMS;
/** @var array */
private $counts;
/** @var array */
private $timing;
/**
* @internal
* @param callable $getIterator Callback that returns a Traversable for mapReduce results
* @param stdClass $result Result document from the mapReduce command
*/
public function __construct(callable $getIterator, stdClass $result)
{
$this->getIterator = $getIterator;
$this->executionTimeMS = (integer) $result->timeMillis;
$this->counts = (array) $result->counts;
$this->timing = isset($result->timing) ? (array) $result->timing : [];
}
/**
* Returns various count statistics from the mapReduce command.
*
* @return array
*/
public function getCounts()
{
return $this->counts;
}
/**
* Return the command execution time in milliseconds.
*
* @return integer
*/
public function getExecutionTimeMS()
{
return (integer) $this->executionTimeMS;
}
/**
* Return the mapReduce results as a Traversable.
*
* @see http://php.net/iteratoraggregate.getiterator
* @return Traversable
*/
public function getIterator()
{
return call_user_func($this->getIterator);
}
/**
* Returns various timing statistics from the mapReduce command.
*
* Note: timing statistics are only available if the mapReduce command's
* "verbose" option was true; otherwise, an empty array will be returned.
*
* @return array
*/
public function getTiming()
{
return $this->timing;
}
}