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/**
* Copyright (C) 2018-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 "mongo/bson/bsonobj.h"
namespace mongo {
/**
* Delimits ranges of _ids for dbCheck.
*
* Allows wrapping and comparing arbitrary BSONElements.
*/
class BSONKey {
public:
/**
* Generate a BSONKey from the provided BSONElement.
*
* Discards `element`'s field name.
*/
static BSONKey parseFromBSON(const BSONElement& element);
/**
* A BSONKey that compares less than any other BSONKey.
*/
static BSONKey min(void);
/**
* A BSONKey that compares greater than any other BSONKey.
*/
static BSONKey max(void);
BSONKey(void) {}
/**
* Serialize this class as a field in a document.
*/
void serializeToBSON(StringData fieldName, BSONObjBuilder* builder) const;
const BSONObj& obj() const;
BSONElement elem() const;
/**
* Lexicographical comparison between BSONKeys.
*/
bool operator==(const BSONKey& other) const;
bool operator!=(const BSONKey& other) const;
bool operator<(const BSONKey& other) const;
bool operator<=(const BSONKey& other) const;
bool operator>(const BSONKey& other) const;
bool operator>=(const BSONKey& other) const;
/**
* Lexicographical comparison between BSONKeys and BSONElements, ignoring field names.
*/
bool operator==(const BSONElement& other) const;
bool operator!=(const BSONElement& other) const;
bool operator<(const BSONElement& other) const;
bool operator<=(const BSONElement& other) const;
bool operator>(const BSONElement& other) const;
bool operator>=(const BSONElement& other) const;
private:
explicit BSONKey(const BSONElement& elem);
BSONObj _obj;
};
}
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