/afs/cern.ch/work/a/aaltunda/public/www/CMSSW_6_2_5/src/RecoParticleFlow/PFTracking/plugins/PFTrackProducer.cc

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#include <memory>
#include "RecoParticleFlow/PFTracking/interface/PFTrackProducer.h"
#include "RecoParticleFlow/PFTracking/interface/PFTrackTransformer.h"
#include "DataFormats/ParticleFlowReco/interface/PFRecTrack.h"
#include "DataFormats/ParticleFlowReco/interface/PFRecTrackFwd.h"
#include "DataFormats/TrackReco/interface/Track.h"
#include "DataFormats/TrackReco/interface/TrackFwd.h"
#include "DataFormats/GsfTrackReco/interface/GsfTrack.h"
#include "DataFormats/GsfTrackReco/interface/GsfTrackFwd.h"
#include "DataFormats/EgammaReco/interface/ElectronSeed.h"
#include "DataFormats/EgammaReco/interface/ElectronSeedFwd.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"
#include "DataFormats/MuonReco/interface/MuonFwd.h"
#include "DataFormats/MuonReco/interface/Muon.h"
#include "TrackingTools/TransientTrack/interface/TransientTrackBuilder.h"
#include "TrackingTools/Records/interface/TransientTrackRecord.h"
#include "TrackingTools/IPTools/interface/IPTools.h"
#include "DataFormats/VertexReco/interface/VertexFwd.h"
#include "DataFormats/VertexReco/interface/Vertex.h"

using namespace std;
using namespace edm;
using namespace reco;
PFTrackProducer::PFTrackProducer(const ParameterSet& iConfig):
  pfTransformer_(0)
{
  produces<reco::PFRecTrackCollection>();
  
  tracksContainers_ = 
    iConfig.getParameter< vector < InputTag > >("TkColList");
  
  useQuality_   = iConfig.getParameter<bool>("UseQuality");
  
  gsfTrackLabel_ = iConfig.getParameter<InputTag>
    ("GsfTrackModuleLabel");  

  trackQuality_=reco::TrackBase::qualityByName(iConfig.getParameter<std::string>("TrackQuality"));
  
  muonColl_ = iConfig.getParameter< InputTag >("MuColl");
  
  trajinev_ = iConfig.getParameter<bool>("TrajInEvents");
  
  gsfinev_ = iConfig.getParameter<bool>("GsfTracksInEvents");
  vtx_h=iConfig.getParameter<edm::InputTag>("PrimaryVertexLabel");
}

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

void
PFTrackProducer::produce(Event& iEvent, const EventSetup& iSetup)
{
  
  //create the empty collections 
  auto_ptr< reco::PFRecTrackCollection > 
    PfTrColl (new reco::PFRecTrackCollection);
  
  //read track collection
  Handle<GsfTrackCollection> gsftrackcoll;
  bool foundgsf = iEvent.getByLabel(gsfTrackLabel_,gsftrackcoll);
  GsfTrackCollection gsftracks;
  //Get PV for STIP calculation, if there is none then take the dummy  
  Handle<reco::VertexCollection> vertex;
  iEvent.getByLabel(vtx_h, vertex);
  reco::Vertex dummy;
  const reco::Vertex* pv=&dummy;  
  if (vertex.isValid()) 
    {
      pv = &*vertex->begin();    
    } 
  else 
    { // create a dummy PV
      reco::Vertex::Error e;
      e(0, 0) = 0.0015 * 0.0015;
      e(1, 1) = 0.0015 * 0.0015;
      e(2, 2) = 15. * 15.;
      reco::Vertex::Point p(0, 0, 0);
      dummy = reco::Vertex(p, e, 0, 0, 0);   
    } 
  
  edm::ESHandle<TransientTrackBuilder> builder;
  iSetup.get<TransientTrackRecord>().get("TransientTrackBuilder", builder);
  TransientTrackBuilder thebuilder = *(builder.product());
  
  
  if(gsfinev_) {
    if(!foundgsf )
      LogError("PFTrackProducer")
        <<" cannot get GsfTracks (probably in HI events): "
        << " please set GsfTracksInEvents = False in RecoParticleFlow/PFTracking/python/pfTrack_cfi.py" << endl;
    else
      gsftracks  = *(gsftrackcoll.product());
  }  
  
  // read muon collection
  Handle< reco::MuonCollection > recMuons;
  iEvent.getByLabel(muonColl_, recMuons);
  
  
  for (unsigned int istr=0; istr<tracksContainers_.size();istr++){
    
    //Track collection
    Handle<reco::TrackCollection> tkRefCollection;
    iEvent.getByLabel(tracksContainers_[istr], tkRefCollection);
    reco::TrackCollection  Tk=*(tkRefCollection.product());
    
    vector<Trajectory> Tj(0);
    if(trajinev_) {
      //Trajectory collection
      Handle<vector<Trajectory> > tjCollection;
      bool found = iEvent.getByLabel(tracksContainers_[istr], tjCollection);
        if(!found )
          LogError("PFTrackProducer")
            <<" cannot get Trajectories of: "
            <<  tracksContainers_[istr]
            << " please set TrajInEvents = False in RecoParticleFlow/PFTracking/python/pfTrack_cfi.py" << endl;
        
        Tj =*(tjCollection.product());
    }
    
    
    for(unsigned int i=0;i<Tk.size();i++){
      
      reco::TrackRef trackRef(tkRefCollection, i);
        
      if (useQuality_ &&
          (!(Tk[i].quality(trackQuality_)))){
        
        bool isMuCandidate = false;
        
        //TrackRef trackRef(tkRefCollection, i);
        
        if(recMuons.isValid() ) {
          for(unsigned j=0;j<recMuons->size(); j++) {
            reco::MuonRef muonref( recMuons, j );
            if (muonref->track().isNonnull()) 
              if( muonref->track() == trackRef && muonref->isGlobalMuon()){
                isMuCandidate=true;
                //cout<<" SAVING TRACK "<<endl;
                break;
              }
          }
        }
        else{
          edm::LogError("MissingInput")<<"there is no valide:"<<muonColl_<<" to be used.";
        }

        if(!isMuCandidate)
          {
            continue;     
          }
        
      }
           
      // find the pre-id kf track
      bool preId = false;
      if(foundgsf) {
        for (unsigned int igsf=0; igsf<gsftracks.size();igsf++) {
          GsfTrackRef gsfTrackRef(gsftrackcoll, igsf);
          if (gsfTrackRef->seedRef().isNull()) continue;
          ElectronSeedRef ElSeedRef= gsfTrackRef->extra()->seedRef().castTo<ElectronSeedRef>();
          if (ElSeedRef->ctfTrack().isNonnull()) {
            if(ElSeedRef->ctfTrack() == trackRef) preId = true;
          }
        }
      }
      if(preId) {
        // Set PFRecTrack of type KF_ElCAND
        reco::PFRecTrack pftrack( trackRef->charge(), 
                                  reco::PFRecTrack::KF_ELCAND, 
                                  i, trackRef );
        
        bool valid = false;
        if(trajinev_) {
          valid = pfTransformer_->addPoints( pftrack, *trackRef, Tj[i]);
        }
        else {
          Trajectory FakeTraj;
          valid = pfTransformer_->addPoints( pftrack, *trackRef, FakeTraj);
        }
        if(valid) {
          //calculate STIP
          double stip=-999;
          const reco::PFTrajectoryPoint& atECAL=pftrack.extrapolatedPoint(reco::PFTrajectoryPoint::ECALEntrance);
          if(atECAL.isValid()) //if track extrapolates to ECAL
            {
              GlobalVector direction(pftrack.extrapolatedPoint(reco::PFTrajectoryPoint::ECALEntrance).position().x(),
                                     pftrack.extrapolatedPoint(reco::PFTrajectoryPoint::ECALEntrance).position().y(), 
                                     pftrack.extrapolatedPoint(reco::PFTrajectoryPoint::ECALEntrance).position().z());
              stip = IPTools::signedTransverseImpactParameter(thebuilder.build(*trackRef), direction, *pv).second.significance();
            }
          pftrack.setSTIP(stip);
          PfTrColl->push_back(pftrack);
        }               
      }
      else {
        reco::PFRecTrack pftrack( trackRef->charge(), 
                                  reco::PFRecTrack::KF, 
                                  i, trackRef );
        bool valid = false;
        if(trajinev_) {
          valid = pfTransformer_->addPoints( pftrack, *trackRef, Tj[i]);
        }
        else {
          Trajectory FakeTraj;
          valid = pfTransformer_->addPoints( pftrack, *trackRef, FakeTraj);
        }
        
        if(valid) {
          double stip=-999;
          const reco::PFTrajectoryPoint& atECAL=pftrack.extrapolatedPoint(reco::PFTrajectoryPoint::ECALEntrance);
          if(atECAL.isValid())
            {
              GlobalVector direction(pftrack.extrapolatedPoint(reco::PFTrajectoryPoint::ECALEntrance).position().x(),
                                     pftrack.extrapolatedPoint(reco::PFTrajectoryPoint::ECALEntrance).position().y(), 
                                     pftrack.extrapolatedPoint(reco::PFTrajectoryPoint::ECALEntrance).position().z());
              stip = IPTools::signedTransverseImpactParameter(thebuilder.build(*trackRef), direction, *pv).second.significance();
            }
          pftrack.setSTIP(stip);
          PfTrColl->push_back(pftrack);
        }
      }
    }
  }
  iEvent.put(PfTrColl);
}

// ------------ method called once each job just before starting event loop  ------------
void 
PFTrackProducer::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))));
  if(!trajinev_)
    pfTransformer_->OnlyProp();
}

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