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// expression_geo.h
/**
* Copyright (C) 2013 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 <boost/shared_ptr.hpp>
#include "mongo/db/geo/geometry_container.h"
#include "mongo/db/matcher/expression.h"
#include "mongo/db/matcher/expression_leaf.h"
namespace mongo {
struct PointWithCRS;
class GeometryContainer;
// This represents either a $within or a $geoIntersects.
class GeoExpression {
MONGO_DISALLOW_COPYING(GeoExpression);
public:
GeoExpression();
GeoExpression(const std::string& f);
enum Predicate {
WITHIN,
INTERSECT,
INVALID
};
// parseFrom() must be called before getGeometry() to ensure initialization of geoContainer
Status parseFrom(const BSONObj &obj);
std::string getField() const { return field; }
Predicate getPred() const { return predicate; }
const GeometryContainer& getGeometry() const { return *geoContainer; }
private:
// Parse geospatial query
// e.g.
// { "$intersect" : { "$geometry" : { "type" : "Point", "coordinates": [ 40, 5 ] } } }
Status parseQuery(const BSONObj &obj);
// Name of the field in the query.
std::string field;
std::unique_ptr<GeometryContainer> geoContainer;
Predicate predicate;
};
class GeoMatchExpression : public LeafMatchExpression {
public:
GeoMatchExpression() : LeafMatchExpression( GEO ){}
virtual ~GeoMatchExpression(){}
/**
* Takes ownership of the passed-in GeoExpression.
*/
Status init( StringData path, const GeoExpression* query, const BSONObj& rawObj );
virtual bool matchesSingleElement( const BSONElement& e ) const;
virtual void debugString( StringBuilder& debug, int level = 0 ) const;
virtual void toBSON(BSONObjBuilder* out) const;
virtual bool equivalent( const MatchExpression* other ) const;
virtual LeafMatchExpression* shallowClone() const;
const GeoExpression& getGeoExpression() const { return *_query; }
const BSONObj getRawObj() const { return _rawObj; }
private:
BSONObj _rawObj;
// Share ownership of our query with all of our clones
boost::shared_ptr<const GeoExpression> _query;
};
// TODO: Make a struct, turn parse stuff into something like
// static Status parseNearQuery(const BSONObj& obj, NearQuery** out);
class GeoNearExpression {
MONGO_DISALLOW_COPYING(GeoNearExpression);
public:
GeoNearExpression();
GeoNearExpression(const std::string& f);
Status parseFrom(const BSONObj &obj);
// The name of the field that contains the geometry.
std::string field;
// The starting point of the near search. Use forward declaration of geometries.
std::unique_ptr<PointWithCRS> centroid;
// Min and max distance from centroid that we're willing to search.
// Distance is in units of the geometry's CRS, except SPHERE and isNearSphere => radians
double minDistance;
double maxDistance;
// Is this a $nearSphere query
bool isNearSphere;
// $nearSphere with a legacy point implies units are radians
bool unitsAreRadians;
// $near with a non-legacy point implies a wrapping query, otherwise the query doesn't wrap
bool isWrappingQuery;
std::string toString() const {
std::stringstream ss;
ss << " field=" << field;
ss << " maxdist=" << maxDistance;
ss << " isNearSphere=" << isNearSphere;
return ss.str();
}
private:
bool parseLegacyQuery(const BSONObj &obj);
Status parseNewQuery(const BSONObj &obj);
};
class GeoNearMatchExpression : public LeafMatchExpression {
public:
GeoNearMatchExpression() : LeafMatchExpression( GEO_NEAR ){}
virtual ~GeoNearMatchExpression(){}
Status init( StringData path, const GeoNearExpression* query, const BSONObj& rawObj );
// This shouldn't be called and as such will crash. GeoNear always requires an index.
virtual bool matchesSingleElement( const BSONElement& e ) const;
virtual void debugString( StringBuilder& debug, int level = 0 ) const;
virtual void toBSON(BSONObjBuilder* out) const;
virtual bool equivalent( const MatchExpression* other ) const;
virtual LeafMatchExpression* shallowClone() const;
const GeoNearExpression& getData() const { return *_query; }
const BSONObj getRawObj() const { return _rawObj; }
private:
BSONObj _rawObj;
// Share ownership of our query with all of our clones
boost::shared_ptr<const GeoNearExpression> _query;
};
} // namespace mongo
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