metadata.h

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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:
 *
 *     * Redistributions of source code must retain the above copyright
 *       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
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 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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#ifndef MONGO_ROS_METADATA_H
#define MONGO_ROS_METADATA_H

// We have to include this top-level include here because
// the mongo c++ library is not robust to reincludes
#include <mongo/client/gridfs.h>
#include <ros/ros.h>


namespace mongo_ros
{

using mongo::LT;
using mongo::LTE;
using mongo::GT;
using mongo::GTE;
using mongo::BSONObj;
using mongo::BSONObjBuilder;

class WrappedBSON : public BSONObj
{
public:
  WrappedBSON () :
    BSONObj(), builder_(new BSONObjBuilder())
  {}

  WrappedBSON (const WrappedBSON& other) :
    BSONObj(), builder_(other.builder_)
  {
    update();
  }

  WrappedBSON (const std::string& json) :
    BSONObj(), builder_(new BSONObjBuilder())
  {
    builder_->appendElements(mongo::fromjson(json.c_str()));
    update();
  }

protected:

  boost::shared_ptr<BSONObjBuilder> builder_;

  void update ()
  {
    BSONObj::operator=(builder_->asTempObj());
  }
};


class Query : public WrappedBSON
{
public:
  Query () : WrappedBSON ()
  {}

  Query (const Query& other) :
    WrappedBSON(other)
  {}

  template <class T>
  Query (const std::string& name, const T& val) :
    WrappedBSON ()
  {
    append(name, val);
  }

  template <class T, class S>
  Query (const std::string& name, const S& rel, const T& val) :
    WrappedBSON ()
  {
    append(name, rel, val);
  }

  template <class T>
  Query& append (const std::string& name,
                 const T& val)
  {
    *builder_ << name << val;
    update();
    return *this;
  }

  template <class T, class S>
  Query& append (const std::string& name,
                       const T& rel,
                       const S& val)
  {
    *builder_ << name << rel << val;
    update();
    return *this;
  }


};



class Metadata : public WrappedBSON
{
public:
  Metadata() :
    WrappedBSON ()
  {
    initialize();
  }

  Metadata(const std::string& json) :
    WrappedBSON (json)
  {
    update();
  }

  Metadata (const Metadata& other) :
    WrappedBSON(other)
  {
    update();
  }

  template <class T>
  Metadata (const std::string& name, const T& val) :
    WrappedBSON ()
  {
    initialize();
    append(name, val);
  }

  template <class T, class T2>
  Metadata (const std::string& n, const T& v,
            const std::string& n2, const T2& v2) :
    WrappedBSON ()
  {
    initialize();
    append(n, v);
    append(n2, v2);
  }

  template <class T1, class T2, class T3>
  Metadata (const std::string& n1, const T1& v1,
            const std::string& n2, const T2& v2,
            const std::string& n3, const T3& v3) :
    WrappedBSON ()
  {
    initialize();
    append(n1, v1);
    append(n2, v2);
    append(n3, v3);
  }

  template <class T1, class T2, class T3>
  Metadata (const std::string& n1, const T1& v1,
            const std::string& n2, const T2& v2,
            const std::string& n3, const T3& v3,
            const std::string& n4, const T3& v4) :
    WrappedBSON ()
  {
    initialize();
    append(n1, v1);
    append(n2, v2);
    append(n3, v3);
    append(n4, v4);
  }

  template <class T1, class T2, class T3>
  Metadata (const std::string& n1, const T1& v1,
            const std::string& n2, const T2& v2,
            const std::string& n3, const T3& v3,
            const std::string& n4, const T3& v4,
            const std::string& n5, const T3& v5) :
    WrappedBSON ()
  {
    initialize();
    append(n1, v1);
    append(n2, v2);
    append(n3, v3);
    append(n4, v4);
    append(n5, v5);
  }

  template <class T>
  Metadata& append (const std::string& name,
                 const T& val)
  {
    builder_->append(name, val);
    update();
    return *this;
  }

private:

  void initialize()
  {
    builder_->genOID();
    builder_->append("creation_time", ros::Time::now().toSec());
    update();
  }
};




} // namespace

#endif // include guard