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/**
* Copyright (C) 2015 10gen 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 <string>
#include "mongo/db/jsobj.h"
#include "mongo/db/query/collation/collator_interface.h"
class S2CellId;
class S2RegionCoverer;
namespace mongo {
class GeometryContainer;
// An enum describing the version of an S2 index.
enum S2IndexVersion {
// The first version of the S2 index, introduced in MongoDB 2.4.0. Compatible with MongoDB
// 2.4.0 and later. Supports the following GeoJSON objects: Point, LineString, Polygon.
S2_INDEX_VERSION_1 = 1,
// The second version of the S2 index, introduced in MongoDB 2.6.0. Compatible with
// MongoDB 2.6.0 and later. Introduced support for the following GeoJSON objects:
// MultiPoint, MultiLineString, MultiPolygon, GeometryCollection.
S2_INDEX_VERSION_2 = 2,
// The third version of the S2 index, introduced in MongoDB 3.2.0. Introduced
// performance improvements and changed the key type from string to numeric
S2_INDEX_VERSION_3 = 3
};
struct S2IndexingParams {
// Since we take the cartesian product when we generate keys for an insert,
// we need a cap.
std::size_t maxKeysPerInsert;
// This is really an advisory parameter that we pass to the cover generator. The
// finest/coarsest index level determine the required # of cells.
int maxCellsInCovering;
// What's the finest grained level that we'll index for non-points?
int finestIndexedLevel;
// And, what's the coarsest for non-points? When we search in larger coverings
// we know we can stop here -- we index nothing coarser than this.
int coarsestIndexedLevel;
// Version of this index (specific to the index type).
S2IndexVersion indexVersion;
// Radius of the earth in meters
double radius;
// Null if this index orders strings according to the simple binary compare. If non-null,
// represents the collator used to generate index keys for indexed strings.
const CollatorInterface* collator = nullptr;
std::string toString() const;
void configureCoverer(const GeometryContainer& geoContainer, S2RegionCoverer* coverer) const;
};
BSONObj S2CellIdToIndexKey(const S2CellId& cellId, S2IndexVersion indexVersion);
} // namespace mongo
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