/afs/cern.ch/work/a/aaltunda/public/www/CMSSW_6_2_7/src/RecoParticleFlow/PFTracking/plugins/PFNuclearProducer.cc

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#include <memory>
#include "RecoParticleFlow/PFTracking/interface/PFNuclearProducer.h"
#include "RecoParticleFlow/PFTracking/interface/PFTrackTransformer.h"
#include "DataFormats/ParticleFlowReco/interface/PFNuclearInteraction.h"
#include "TrackingTools/PatternTools/interface/Trajectory.h"
#include "FWCore/Framework/interface/ESHandle.h"
#include "MagneticField/Engine/interface/MagneticField.h"
#include "MagneticField/Records/interface/IdealMagneticFieldRecord.h"
using namespace std;
using namespace edm;
PFNuclearProducer::PFNuclearProducer(const ParameterSet& iConfig):
  pfTransformer_(0)
{
  produces<reco::PFRecTrackCollection>();
  produces<reco::PFNuclearInteractionCollection>();

  nuclearContainers_ = 
    iConfig.getParameter< vector < InputTag > >("nuclearColList");
  likelihoodCut_
     = iConfig.getParameter<double>("likelihoodCut");
}

PFNuclearProducer::~PFNuclearProducer()
{
  delete pfTransformer_;
}

void
PFNuclearProducer::produce(Event& iEvent, const EventSetup& iSetup)
{
  typedef reco::NuclearInteraction::trackRef_iterator trackRef_iterator;

  //create the empty collections 
  auto_ptr< reco::PFNuclearInteractionCollection > 
    pfNuclearColl (new reco::PFNuclearInteractionCollection);
  auto_ptr< reco::PFRecTrackCollection > 
    pfNuclearRecTrackColl (new reco::PFRecTrackCollection);
  
  reco::PFRecTrackRefProd pfTrackRefProd = iEvent.getRefBeforePut<reco::PFRecTrackCollection>();
  int hid=0;

  // loop on the nuclear interaction collections
  for (unsigned int istr=0; istr<nuclearContainers_.size();istr++){
    
    Handle<reco::NuclearInteractionCollection> nuclCollH;
    iEvent.getByLabel(nuclearContainers_[istr], nuclCollH);
    const reco::NuclearInteractionCollection& nuclColl = *(nuclCollH.product());

    // loop on all NuclearInteraction 
    for( unsigned int icoll=0; icoll < nuclColl.size(); icoll++) {

      if( nuclColl[icoll].likelihood() < likelihoodCut_) continue;

      reco::PFRecTrackRefVector pfRecTkcoll;

      // convert the secondary tracks
      for(trackRef_iterator it = nuclColl[icoll].secondaryTracks_begin(); it!=nuclColl[icoll].secondaryTracks_end(); it++){
        reco::PFRecTrack pftrack( (*it)->charge(), 
                                reco::PFRecTrack::KF, 
                                it->key(), (reco::TrackRef)((*it).castTo<reco::TrackRef>()) );
        Trajectory FakeTraj;
        bool valid = pfTransformer_->addPoints( pftrack, **it, FakeTraj);
        if(valid) {
          pfRecTkcoll.push_back(reco::PFRecTrackRef( pfTrackRefProd, hid++ ));  
          pfNuclearRecTrackColl->push_back(pftrack);
        }
      }
      reco::NuclearInteractionRef niRef(nuclCollH, icoll);
      pfNuclearColl->push_back( reco::PFNuclearInteraction( niRef, pfRecTkcoll ));
    }
  }
  iEvent.put(pfNuclearRecTrackColl);
  iEvent.put(pfNuclearColl);
}

// ------------ method called once each job just before starting event loop  ------------
void 
PFNuclearProducer::beginRun(const edm::Run& run,
                            const EventSetup& iSetup)
{
  ESHandle<MagneticField> magneticField;
  iSetup.get<IdealMagneticFieldRecord>().get(magneticField);
  pfTransformer_= new PFTrackTransformer(math::XYZVector(magneticField->inTesla(GlobalPoint(0,0,0))));
  pfTransformer_->OnlyProp();
}

// ------------ method called once each job just after ending the event loop  ------------
void 
PFNuclearProducer::endRun(const edm::Run& run,
                          const EventSetup& iSetup) {
  delete pfTransformer_;
  pfTransformer_=nullptr;
}