nodelet_demux.h

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/*
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 * $Id: nodelet_mux.h 27892 2010-02-25 06:47:29Z rusu $
 *
 */
#ifndef NODELET_NODELET_DEMUX_H_
#define NODELET_NODELET_DEMUX_H_

#include <ros/ros.h>
#include <nodelet/nodelet.h>
#include <message_filters/time_synchronizer.h>
#include <message_filters/subscriber.h>

namespace nodelet
{
  template <typename T, typename Subscriber = message_filters::Subscriber<T> >
  class NodeletDEMUX: public Nodelet
  {
    typedef typename boost::shared_ptr<const T> TConstPtr;
    public:

      void
        onInit ()
      {
        private_nh_ = getPrivateNodeHandle ();
        sub_input_.subscribe (private_nh_, "input", 1, bind (&NodeletDEMUX<T,Subscriber>::input_callback, this, _1));

        if (!private_nh_.getParam ("output_topics", output_topics_))
        {
          ROS_ERROR ("[nodelet::NodeletDEMUX::init] Need a 'output_topics' parameter to be set before continuing!");
          return;
        }
        // Check the type
        switch (output_topics_.getType ())
        {
          case XmlRpc::XmlRpcValue::TypeArray:
          {
            if (output_topics_.size () == 1)
            {
              ROS_ERROR ("[nodelet::NodeletDEMUX::init] Only one topic given. Does it make sense to passthrough?");
              return;
            }

            if (output_topics_.size () > 8)
            {
              ROS_ERROR ("[nodelet::NodeletDEMUX::init] More than 8 topics passed!");
              return;
             }

            ROS_INFO_STREAM ("[nodelet::NodeletDEMUX::init] Publishing to " << output_topics_.size () << " user given topics as outputs:");
            for (int d = 0; d < output_topics_.size (); ++d)
              ROS_INFO_STREAM (" - " << (std::string)(output_topics_[d]));

            pubs_output_.resize (output_topics_.size ());
            for (int d = 0; d < output_topics_.size (); ++d)
              pubs_output_[d] = boost::make_shared<ros::Publisher>(private_nh_.template advertise<T> ((std::string)(output_topics_[d]), 1));
            break;
          }
          default:
          {
            ROS_ERROR ("[nodelet::NodeletDEMUX::init] Invalid 'output_topics' parameter given!");
            return;
          }
        }
      }

    private:

      void
        input_callback (const TConstPtr &input)
      {
        for (size_t d = 0; d < pubs_output_.size (); ++d)
          pubs_output_[d]->publish (input);
      }

      ros::NodeHandle private_nh_;
      std::vector<boost::shared_ptr <ros::Publisher> > pubs_output_;
      Subscriber sub_input_;


      XmlRpc::XmlRpcValue output_topics_;
  };

  template <typename T>
  class NodeletDEMUX<T, message_filters::Subscriber<T> >: public Nodelet
  {
    typedef typename boost::shared_ptr<const T> TConstPtr;
    public:

      void
        onInit ()
      {
        private_nh_ = getPrivateNodeHandle ();

        sub_input_ = private_nh_.subscribe ("input", 1, &NodeletDEMUX<T>::input_callback, this);

        if (!private_nh_.getParam ("output_topics", output_topics_))
        {
          ROS_ERROR ("[nodelet::NodeletDEMUX::init] Need a 'output_topics' parameter to be set before continuing!");
          return;
        }
        // Check the type
        switch (output_topics_.getType ())
        {
          case XmlRpc::XmlRpcValue::TypeArray:
          {
            if (output_topics_.size () == 1)
            {
              ROS_ERROR ("[nodelet::NodeletDEMUX::init] Only one topic given. Does it make sense to passthrough?");
              return;
            }

            if (output_topics_.size () > 8)
            {
              ROS_ERROR ("[nodelet::NodeletDEMUX::init] More than 8 topics passed!");
              return;
             }

            ROS_INFO_STREAM ("[nodelet::NodeletDEMUX::init] Publishing to " << output_topics_.size () << " user given topics as outputs:");
            for (int d = 0; d < output_topics_.size (); ++d)
              ROS_INFO_STREAM (" - " << (std::string)(output_topics_[d]));

            pubs_output_.resize (output_topics_.size ());
            for (int d = 0; d < output_topics_.size (); ++d)
              pubs_output_[d] = boost::make_shared<ros::Publisher>(private_nh_.template advertise<T> ((std::string)(output_topics_[d]), 1));
            break;
          }
          default:
          {
            ROS_ERROR ("[nodelet::NodeletDEMUX::init] Invalid 'output_topics' parameter given!");
            return;
          }
        }
      }

    private:

      void
        input_callback (const TConstPtr &input)
      {
        for (size_t d = 0; d < pubs_output_.size (); ++d)
          pubs_output_[d]->publish (input);
      }

      ros::NodeHandle private_nh_;
      std::vector<boost::shared_ptr <ros::Publisher> > pubs_output_;
      ros::Subscriber sub_input_;


      XmlRpc::XmlRpcValue output_topics_;
  };

}
#endif