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/**
* Copyright (C) 2016 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 <boost/optional.hpp>
#include "mongo/bson/bsonobj.h"
namespace mongo {
/**
* Holds a single result from a mongoS find command shard request. This result can represent one of
* several states:
* - Contains collection data, stored in '_resultObj'.
* - Contains a view definition, stored in '_viewDefinition'.
* - EOF. Both '_resultObj' and '_viewDefinition' are isEOF() returns true.
*/
class ClusterQueryResult {
public:
ClusterQueryResult() = default;
ClusterQueryResult(BSONObj resObj) : _resultObj(resObj) {}
bool isEOF() const {
return !_resultObj && !_viewDefinition;
}
boost::optional<BSONObj> getResult() const {
return _resultObj;
}
boost::optional<BSONObj> getViewDefinition() const {
return _viewDefinition;
}
void setViewDefinition(BSONObj viewDef) {
invariant(isEOF());
_viewDefinition = viewDef;
}
private:
boost::optional<BSONObj> _resultObj;
boost::optional<BSONObj> _viewDefinition;
};
} // namespace mongo
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