TrackAssociatorByChi2Impl.h

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#ifndef TrackAssociatorByChi2Impl_h
#define TrackAssociatorByChi2Impl_h

#include "SimDataFormats/Associations/interface/TrackToTrackingParticleAssociatorBaseImpl.h"
#include "SimDataFormats/Track/interface/SimTrackContainer.h"
#include "MagneticField/Engine/interface/MagneticField.h"
#include "SimDataFormats/Vertex/interface/SimVertexContainer.h"
#include "FWCore/MessageLogger/interface/MessageLogger.h"
#include "DataFormats/Math/interface/LorentzVector.h"
#include "DataFormats/BeamSpot/interface/BeamSpot.h"
#include "DataFormats/HepMCCandidate/interface/GenParticle.h"
#include "DataFormats/HepMCCandidate/interface/GenParticleFwd.h"

#include <map>

//Note that the Association Map is filled with -ch2 and not chi2 because it is ordered using std::greater:
//the track with the lowest association chi2 will be the first in the output map.

namespace reco {
  typedef edm::AssociationMap<
      edm::OneToManyWithQualityGeneric<reco::GenParticleCollection, edm::View<reco::Track>, double> >
      GenToRecoCollection;
  typedef edm::AssociationMap<
      edm::OneToManyWithQualityGeneric<edm::View<reco::Track>, reco::GenParticleCollection, double> >
      RecoToGenCollection;
}  // namespace reco

class TrackAssociatorByChi2Impl : public reco::TrackToTrackingParticleAssociatorBaseImpl {
public:
  typedef std::map<double, SimTrack> Chi2SimMap;
  typedef std::pair<reco::Track, Chi2SimMap> RecoToSimPair;
  typedef std::vector<RecoToSimPair> RecoToSimPairAssociation;

  /*
  TrackAssociatorByChi2Impl(const edm::ESHandle<MagneticField> mF, const edm::ParameterSet& conf):
    chi2cut(conf.getParameter<double>("chi2cut")),
    onlyDiagonal(conf.getParameter<bool>("onlyDiagonal")),
    bsSrc(conf.getParameter<edm::InputTag>("beamSpot")) {
    theMF=mF;  
    if (onlyDiagonal)
      edm::LogInfo("TrackAssociator") << " ---- Using Off Diagonal Covariance Terms = 0 ---- " <<  "\n";
    else 
      edm::LogInfo("TrackAssociator") << " ---- Using Off Diagonal Covariance Terms != 0 ---- " <<  "\n";
  }
  */

  TrackAssociatorByChi2Impl(const MagneticField& mF, const reco::BeamSpot& bs, double chi2Cut, bool onlyDiag)
      : theMF(&mF), theBeamSpot(&bs), chi2cut(chi2Cut), onlyDiagonal(onlyDiag) {}


  reco::RecoToSimCollection associateRecoToSim(const edm::RefToBaseVector<reco::Track>&,
                                               const edm::RefVector<TrackingParticleCollection>&) const override;

  reco::SimToRecoCollection associateSimToReco(const edm::RefToBaseVector<reco::Track>&,
                                               const edm::RefVector<TrackingParticleCollection>&) const override;


  reco::RecoToSimCollection associateRecoToSim(const edm::Handle<edm::View<reco::Track> >& tCH,
                                               const edm::Handle<TrackingParticleCollection>& tPCH) const override {
    return TrackToTrackingParticleAssociatorBaseImpl::associateRecoToSim(tCH, tPCH);
  }


  reco::SimToRecoCollection associateSimToReco(const edm::Handle<edm::View<reco::Track> >& tCH,
                                               const edm::Handle<TrackingParticleCollection>& tPCH) const override {
    return TrackToTrackingParticleAssociatorBaseImpl::associateSimToReco(tCH, tPCH);
  }

private:
  double getChi2(const reco::TrackBase::ParameterVector& rParameters,
                 const reco::TrackBase::CovarianceMatrix& recoTrackCovMatrix,
                 const Basic3DVector<double>& momAtVtx,
                 const Basic3DVector<double>& vert,
                 int charge,
                 const reco::BeamSpot&) const;

  const MagneticField* theMF;
  const reco::BeamSpot* theBeamSpot;
  double chi2cut;
  bool onlyDiagonal;
};

#endif