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Diffstat (limited to 'src/mongo/db/query/record_id_range.h')
| -rw-r--r-- | src/mongo/db/query/record_id_range.h | 117 |
1 files changed, 117 insertions, 0 deletions
diff --git a/src/mongo/db/query/record_id_range.h b/src/mongo/db/query/record_id_range.h new file mode 100644 index 00000000000..d25e17356c1 --- /dev/null +++ b/src/mongo/db/query/record_id_range.h @@ -0,0 +1,117 @@ +/** + * Copyright (C) 2023-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 "mongo/bson/bsonobj.h" +#include "mongo/db/query/record_id_bound.h" + +namespace mongo { + +class RecordIdRange { +public: + /** + * If the provided value @p newMin is greater than the existing min, + * update the lower bound to equal @p newMin + * + * @return true if range was adjusted + */ + void maybeNarrowMin(const BSONObj& newMin, bool inclusive); + void maybeNarrowMin(const RecordIdBound& newMin, bool inclusive); + + /** + * If the provided value @p newMax is less than the existing max, + * update the upper bound to equal @p newMax + * + * @return true if range was adjusted + */ + void maybeNarrowMax(const BSONObj& newMax, bool inclusive); + void maybeNarrowMax(const RecordIdBound& newMax, bool inclusive); + + /** + * Update this range to the intersection of this range + * and @p other. This may update both, one of, or neither of + * min and max. + * + * Results in a range which is either unchanged, or made + * narrower (possibly becoming an empty range). + */ + void intersectRange(const RecordIdRange& other); + /** + * Overload of intersectRange taking the components of a RecordIdRange, + * for convenience when the other range is not handled as a RecordIdRange. + */ + void intersectRange(const boost::optional<RecordIdBound>& min, + const boost::optional<RecordIdBound>& max, + bool minInclusive = true, + bool maxInclusive = true); + + bool isEmpty() const; + + + const auto& getMin() const { + return _min; + } + + const auto& getMax() const { + return _max; + } + + bool isMinInclusive() const { + return _minInclusive; + } + + bool isMaxInclusive() const { + return _maxInclusive; + } + + +private: + // If present, this parameter sets the start point of a forward scan or the end point of a + // reverse scan. + boost::optional<RecordIdBound> _min; + + // If present, this parameter sets the start point of a reverse scan or the end point of a + // forward scan. + boost::optional<RecordIdBound> _max; + + // TODO: investigate folding this into RecordIdBound; many other usages pair RecordIdBound + // with ScanBoundInclusion to convey this information + // If min is present, this indicates whether the range is inclusive or exclusive of the + // set min value + bool _minInclusive = true; + // If max is present, this indicates whether the range is inclusive or exclusive of the + // set max value + bool _maxInclusive = true; +}; + +} // namespace mongo |
