Program Listing for File query_results.h

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// Copyright 2008 Willow Garage, Inc.
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// modification, are permitted provided that the following conditions are met:
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//      notice, this list of conditions and the following disclaimer.
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//    * Redistributions in binary form must reproduce the above copyright
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//      documentation and/or other materials provided with the distribution.
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//    * Neither the name of the Willow Garage, Inc. nor the names of its
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//      this software without specific prior written permission.
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#ifndef WAREHOUSE_ROS_MONGO_QUERY_RESULTS_H
#define WAREHOUSE_ROS_MONGO_QUERY_RESULTS_H

#include <warehouse_ros_mongo/metadata.h>
#include <mongo/client/dbclientcursor.h>
#include <warehouse_ros/query_results.h>
#include <boost/optional.hpp>
#include <memory>

namespace warehouse_ros_mongo
{
typedef std::unique_ptr<mongo::DBClientCursor> CursorPtr;

class MongoResultIterator : public warehouse_ros::ResultIteratorHelper
{
public:
  MongoResultIterator(const std::shared_ptr<mongo::DBClientConnection>& conn, std::shared_ptr<mongo::GridFS> gfs,
                      const std::string& ns, const mongo::Query& query);
  bool next();
  bool hasData() const;
  warehouse_ros::Metadata::ConstPtr metadata() const;
  std::string message() const;
  mongo::BSONObj metadataRaw() const;

private:
  CursorPtr cursor_;
  boost::optional<mongo::BSONObj> next_;
  std::shared_ptr<mongo::GridFS> gfs_;
};

}  // namespace warehouse_ros_mongo

#endif  // include guard