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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 <boost/optional.hpp>
#include <string>
#include <vector>
#include "mongo/base/string_data.h"
#include "mongo/db/namespace_string.h"
#include "mongo/db/pipeline/document_source_merge_modes_gen.h"
namespace mongo {
class BSONObjBuilder;
class BSONElement;
// Defines a policy strategy describing what to do when there is a matching document in the target
// collection. Can hold a value from the MergeWhenMatchedModeEnum, or a custom pipeline definition.
struct MergeWhenMatchedPolicy {
MergeWhenMatchedModeEnum mode;
boost::optional<std::vector<BSONObj>> pipeline;
};
/**
* Serialize and deserialize functions for the $merge stage 'into' field which can be a single
* string value, or an object.
*/
void mergeTargetNssSerializeToBSON(const NamespaceString& targetNss,
StringData fieldName,
BSONObjBuilder* bob);
NamespaceString mergeTargetNssParseFromBSON(const BSONElement& elem);
/**
* Serialize and deserialize functions for the $merge stage 'on' field which can be a single string
* value, or array of strings.
*/
void mergeOnFieldsSerializeToBSON(const std::vector<std::string>& fields,
StringData fieldName,
BSONObjBuilder* bob);
std::vector<std::string> mergeOnFieldsParseFromBSON(const BSONElement& elem);
/**
* Serialize and deserialize functions for the $merge stage 'whenMatched' field which can be either
* a string value, or an array of objects defining a custom pipeline.
*/
void mergeWhenMatchedSerializeToBSON(const MergeWhenMatchedPolicy& policy,
StringData fieldName,
BSONObjBuilder* bob);
MergeWhenMatchedPolicy mergeWhenMatchedParseFromBSON(const BSONElement& elem);
} // namespace mongo
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