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/**
* Copyright (C) 2013-2014 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/status.h"
#include "mongo/db/index/index_access_method.h"
#include "mongo/db/index/index_descriptor.h"
#include "mongo/db/jsobj.h"
namespace mongo {
class Collection;
class OperationContext;
/**
* Maps (lat, lng) to the bucketSize-sided square bucket that contains it.
* Examines all documents in a given radius of a given point.
* Returns all documents that match a given search restriction.
* See http://dochub.mongodb.org/core/haystackindexes
*
* Use when you want to look for restaurants within 25 miles with a certain name.
* Don't use when you want to find the closest open restaurants; see 2d.cpp for that.
*
* Usage:
* db.foo.ensureIndex({ pos : "geoHaystack", type : 1 }, { bucketSize : 1 })
* pos is the name of the field to be indexed that has lat/lng data in an array.
* type is the name of the secondary field to be indexed.
* bucketSize specifies the dimension of the square bucket for the data in pos.
* ALL fields are mandatory.
*/
class HaystackAccessMethod : public BtreeBasedAccessMethod {
public:
using BtreeBasedAccessMethod::_descriptor;
HaystackAccessMethod(IndexCatalogEntry* btreeState, SortedDataInterface* btree);
virtual ~HaystackAccessMethod() { }
protected:
friend class GeoHaystackSearchCommand;
void searchCommand(OperationContext* txn, Collection* collection,
const BSONObj& nearObj, double maxDistance, const BSONObj& search,
BSONObjBuilder* result, unsigned limit);
private:
virtual void getKeys(const BSONObj& obj, BSONObjSet* keys) const;
std::string _geoField;
std::vector<std::string> _otherFields;
double _bucketSize;
};
} // namespace mongo
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