query_results_impl.hpp
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00001  /*
00002  * Copyright (c) 2008, Willow Garage, Inc.
00003  * All rights reserved.
00004  *
00005  * Redistribution and use in source and binary forms, with or without
00006  * modification, are permitted provided that the following conditions are met:
00007  *
00008  *     * Redistributions of source code must retain the above copyright
00009  *       notice, this list of conditions and the following disclaimer.
00010  *     * Redistributions in binary form must reproduce the above copyright
00011  *       notice, this list of conditions and the following disclaimer in the
00012  *       documentation and/or other materials provided with the distribution.
00013  *     * Neither the name of the Willow Garage, Inc. nor the names of its
00014  *       contributors may be used to endorse or promote products derived from
00015  *       this software without specific prior written permission.
00016  *
00017  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
00018  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
00019  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
00020  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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00024  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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00026  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
00027  * POSSIBILITY OF SUCH DAMAGE.
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00029  */
00030 
00041 namespace mongo_ros
00042 {
00043 
00044 using std::vector;
00045 using std::string;
00046 
00047 template <class M>
00048 ResultIterator<M>::ResultIterator
00049 (boost::shared_ptr<mongo::DBClientConnection> conn,
00050  const string& ns, const mongo::Query& query,
00051  boost::shared_ptr<mongo::GridFS> gfs,
00052  const bool metadata_only) :
00053   metadata_only_(metadata_only),
00054   cursor_(new Cursor(conn->query(ns, query))),
00055   gfs_(gfs)
00056 {
00057   if ((*cursor_)->more())
00058     next_ = (*cursor_)->nextSafe();
00059 }
00060 
00061 template <class M>
00062 ResultIterator<M>::ResultIterator () :
00063   metadata_only_(false)
00064 {
00065 }
00066 
00067 template <class M>
00068 ResultIterator<M>::ResultIterator (const ResultIterator<M>& res) :
00069   metadata_only_(res.metadata_only_), cursor_(res.cursor_),
00070   next_(res.next_), gfs_(res.gfs_)
00071 {
00072 }
00073 
00074 template <class M>
00075 void ResultIterator<M>::increment ()
00076 {
00077   ROS_ASSERT (next_);
00078   if ((*cursor_)->more())
00079     next_ = (*cursor_)->nextSafe();
00080   else
00081     next_.reset();
00082 }
00083 
00084 template <class M>
00085 typename MessageWithMetadata<M>::ConstPtr
00086 ResultIterator<M>::dereference () const
00087 {
00088   ROS_ASSERT (next_);
00089   // Get the raw message if necessary, else
00090   // use a default constructed one
00091   typename MessageWithMetadata<M>::Ptr m(new MessageWithMetadata<M>(next_->copy()));
00092   if (!metadata_only_)
00093   {
00094     mongo::OID blob_id;
00095     (*next_)["blob_id"].Val(blob_id);
00096     mongo::BSONObj q = BSON ("_id" << blob_id);
00097     mongo::GridFile f = gfs_->findFile(q);
00098     ROS_ASSERT(f.exists());
00099     std::stringstream ss (std::ios_base::out);
00100     f.write(ss);
00101     std::string str = ss.str();
00102 
00103     uint8_t* buf = (uint8_t*) str.c_str();
00104     ros::serialization::IStream istream(buf, str.size());
00105     ros::serialization::Serializer<M>::read(istream, *m);
00106   }
00107 
00108   return m;
00109 }
00110 
00111 template <class M>
00112 bool ResultIterator<M>::equal (const ResultIterator<M>& other) const
00113 {
00114   // Incomplete; the only case we care about is whether we're at the end yet
00115   if (next_ && other.next_)
00116     ROS_WARN ("Unexpected case of equality check of two not-past-the-end "
00117               "iterators in ResultIterator");
00118   return (!next_ && !other.next_);
00119 }
00120 
00121 
00122 } // namespace


warehouse_ros
Author(s): Bhaskara Marthi
autogenerated on Fri Apr 22 2016 04:08:50