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/**
* Copyright (C) 2016 MongoDB Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License, version 3,
* as published by the Free Software Foundation.
*
* 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
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
* 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 GNU Affero General 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/base/string_data_comparator_interface.h"
#include "mongo/bson/bsonelement_comparator_interface.h"
namespace mongo {
/**
* A BSONElement comparator that supports:
* - Ignoring field names during comparison.
* - Passing a custom string comparator.
*/
class BSONElementComparator final : public BSONElement::ComparatorInterface {
public:
enum class FieldNamesMode {
kConsider,
kIgnore,
};
/**
* Constructs a BSONElement comparator.
*
* Will not consider the elements' field names in comparisons if 'fieldNamesMode' is kIgnore.
*
* If 'stringComparator' is null, uses default binary string comparison. Otherwise,
* 'stringComparator' is used for all string comparisons.
*/
BSONElementComparator(FieldNamesMode fieldNamesMode,
const StringData::ComparatorInterface* stringComparator)
: _stringComparator(stringComparator),
_rules((fieldNamesMode == FieldNamesMode::kConsider) ? ComparisonRules::kConsiderFieldName
: 0) {}
int compare(const BSONElement& lhs, const BSONElement& rhs) const final {
return lhs.woCompare(rhs, _rules, _stringComparator);
}
void hash_combine(size_t& seed, const BSONElement& toHash) const final {
hashCombineBSONElement(seed, toHash, _rules, _stringComparator);
}
private:
const StringData::ComparatorInterface* _stringComparator;
ComparisonRulesSet _rules;
};
} // namespace mongo
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