BackTracker.h

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////////////////////////////////////////////////////////////////////////
/// \file  BackTracker.h
/// \brief back track the reconstruction to the simulation
///
/// \version $Id: Geometry.h,v 1.16 2009/11/03 22:53:20 brebel Exp $
/// \author  brebel@fnal.gov
////////////////////////////////////////////////////////////////////////
#ifndef GAR_CHEAT_BACKTRACKER_H
#define GAR_CHEAT_BACKTRACKER_H

#include <vector>
#include <map>

#include "fhiclcpp/ParameterSet.h"
#include "art/Framework/Services/Registry/ActivityRegistry.h"
#include "art/Framework/Services/Registry/ServiceHandle.h"
#include "art/Framework/Services/Registry/ServiceDeclarationMacros.h"
#include "art/Framework/Services/Registry/ServiceDefinitionMacros.h"
#include "art/Persistency/Provenance/ScheduleContext.h"

#include "MCCheater/BackTrackerCore.h"


namespace gar{
    namespace cheat{

        class BackTracker: public BackTrackerCore{
      
        public:

            using provider_type = BackTrackerCore; ///< type of service provider

            BackTracker(fhicl::ParameterSet     const& pset,
                        art::ActivityRegistry      & reg);
            ~BackTracker();

            void beginJob();
      
            /// Returns a pointer to the geometry service provider
            provider_type const* provider() const { return static_cast<provider_type const*>(this); }

            // The Rebuild function rebuilds the stl containers needed for backtracking queries.
            // It is called automatically at the time registered by the constructor.  In this case,
            // the constructor registers PreProcessEvent.  See the art::ActivityRegistry class.
            // art wants to see a ScheduleContext in the argument, but we don't need that.
            void Rebuild(art::Event const& evt, art::ScheduleContext);
            void RebuildNoSC(art::Event const& evt);



        protected:

        private:

        };
    }
}

DECLARE_ART_SERVICE(gar::cheat::BackTracker, LEGACY)

#endif // CHEAT_BACKTRACK_H