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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 <vector>
#include "mongo/db/geo/hash.h"
#include "mongo/db/geo/shapes.h"
#include "mongo/db/index/s2_common.h"
#include "mongo/db/jsobj.h"
#include "mongo/db/query/index_bounds_builder.h" // For OrderedIntervalList
class S2CellId;
class S2Region;
namespace mongo {
/**
* Functions that compute expression index mappings.
*
* TODO: I think we could structure this more generally with respect to planning.
*/
class ExpressionMapping {
public:
static BSONObj hash(const BSONElement& value);
static std::vector<GeoHash> get2dCovering(const R2Region& region,
const BSONObj& indexInfoObj,
int maxCoveringCells);
static void GeoHashsToIntervalsWithParents(const std::vector<GeoHash>& unorderedCovering,
OrderedIntervalList* oilOut);
static void cover2d(const R2Region& region,
const BSONObj& indexInfoObj,
int maxCoveringCells,
OrderedIntervalList* oilOut);
static std::vector<S2CellId> get2dsphereCovering(const S2Region& region);
static void S2CellIdsToIntervals(const std::vector<S2CellId>& intervalSet,
S2IndexVersion indexVersion,
OrderedIntervalList* oilOut);
// Creates an ordered interval list from range intervals and
// traverses cell parents for exact intervals up to coarsestIndexedLevel
static void S2CellIdsToIntervalsWithParents(const std::vector<S2CellId>& interval,
const S2IndexingParams& indexParams,
OrderedIntervalList* out);
static void cover2dsphere(const S2Region& region,
const S2IndexingParams& indexParams,
OrderedIntervalList* oilOut);
};
} // namespace mongo
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