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/**
* Copyright (C) 2019-present MongoDB, Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the Server Side Public License, version 1,
* as published by MongoDB, Inc.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* Server Side Public License for more details.
*
* You should have received a copy of the Server Side Public License
* along with this program. If not, see
* <http://www.mongodb.com/licensing/server-side-public-license>.
*
* As a special exception, the copyright holders give permission to link the
* code of portions of this program with the OpenSSL library under certain
* conditions as described in each individual source file and distribute
* linked combinations including the program with the OpenSSL library. You
* must comply with the Server Side Public License in all respects for
* all of the code used other than as permitted herein. If you modify file(s)
* with this exception, you may extend this exception to your version of the
* file(s), but you are not obligated to do so. If you do not wish to do so,
* delete this exception statement from your version. If you delete this
* exception statement from all source files in the program, then also delete
* it in the license file.
*/
#pragma once
#include <string>
#include "mongo/base/string_data.h"
#include "mongo/bson/bsonelement.h"
#include "mongo/bson/bsonobjbuilder.h"
namespace mongo {
enum class OutputType {
Replace, // Atomically replace the collection.
Merge, // Merge keys, override dups.
Reduce, // Merge keys, reduce dups.
InMemory // Only store in memory, limited in size.
};
/**
* Parsed MapReduce Out clause.
*/
class MapReduceOutOptions {
public:
static MapReduceOutOptions parseFromBSON(const BSONElement& element);
MapReduceOutOptions() = default;
MapReduceOutOptions(boost::optional<std::string> databaseName,
std::string collectionName,
const OutputType outputType,
bool sharded)
: _databaseName(std::move(databaseName)),
_collectionName(std::move(collectionName)),
_outputType(outputType),
_sharded(sharded) {}
void serializeToBSON(StringData fieldName, BSONObjBuilder* builder) const {
BSONObjBuilder sub(builder->subobjStart(fieldName));
switch (_outputType) {
case OutputType::InMemory:
sub.append("inline", 1);
break;
case OutputType::Replace:
sub.append("replace", _collectionName);
break;
case OutputType::Merge:
sub.append("merge", _collectionName);
break;
case OutputType::Reduce:
sub.append("reduce", _collectionName);
}
if (_databaseName)
sub.append("db", _databaseName.get());
if (_sharded)
sub.append("sharded", true);
}
OutputType getOutputType() const {
return _outputType;
}
const std::string& getCollectionName() const {
return _collectionName;
}
const boost::optional<std::string>& getDatabaseName() const {
return _databaseName;
}
bool isSharded() const {
return _sharded;
}
private:
boost::optional<std::string> _databaseName;
std::string _collectionName;
OutputType _outputType;
bool _sharded;
};
} // namespace mongo
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