query_results.cpp

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/*
 * Copyright (c) 2008, Willow Garage, Inc.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
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 *       notice, this list of conditions and the following disclaimer.
 *     * Redistributions in binary form must reproduce the above copyright
 *       notice, this list of conditions and the following disclaimer in the
 *       documentation and/or other materials provided with the distribution.
 *     * Neither the name of the Willow Garage, Inc. nor the names of its
 *       contributors may be used to endorse or promote products derived from
 *       this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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#include <warehouse_ros_mongo/query_results.h>

#include <utility>

namespace warehouse_ros_mongo
{
MongoResultIterator::MongoResultIterator(const std::shared_ptr<mongo::DBClientConnection>& conn,
                                         std::shared_ptr<mongo::GridFS> gfs, const std::string& ns,
                                         const mongo::Query& query)
  : cursor_(conn->query(ns, query)), gfs_(std::move(gfs))
{
  if (cursor_->more())
    next_ = cursor_->nextSafe();
}

bool MongoResultIterator::next()
{
  ROS_ASSERT(next_);
  if (cursor_->more())
  {
    next_ = cursor_->nextSafe();
    return true;
  }
  else
  {
    next_.reset();
    return false;
  }
}

bool MongoResultIterator::hasData() const
{
  return (bool)next_;
}

warehouse_ros::Metadata::ConstPtr MongoResultIterator::metadata() const
{
  ROS_ASSERT(next_);
  return typename warehouse_ros::Metadata::ConstPtr(new MongoMetadata(next_->copy()));
}

std::string MongoResultIterator::message() const
{
  mongo::OID blob_id;
  (*next_)["blob_id"].Val(blob_id);
  mongo::BSONObj q = BSON("_id" << blob_id);
  mongo::GridFile f = gfs_->findFile(q);
  ROS_ASSERT(f.exists());
  std::stringstream ss(std::ios_base::out);
  f.write(ss);
  return ss.str();
}

mongo::BSONObj MongoResultIterator::metadataRaw() const
{
  ROS_ASSERT(next_);
  return next_->copy();
}

}  // namespace warehouse_ros_mongo