/data/refman/pasoursint/CMSSW_4_1_8_patch12/src/RecoJets/JetAssociationAlgorithms/src/JetTracksAssociationXtrpCalo.cc

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// Associate jets with tracks by simple "dR" criteria
// Fedor Ratnikov (UMd), Aug. 28, 2007
// $Id: JetTracksAssociationXtrpCalo.cc,v 1.2 2010/04/08 09:04:53 kodolova Exp $

#include "RecoJets/JetAssociationAlgorithms/interface/JetTracksAssociationXtrpCalo.h"
#include "DataFormats/GeometrySurface/interface/Cylinder.h"
#include "DataFormats/GeometrySurface/interface/Plane.h"
#include "DataFormats/Math/interface/deltaR.h"
#include "DataFormats/Math/interface/Vector3D.h"
#include "MagneticField/Engine/interface/MagneticField.h"
#include "TrackingTools/GeomPropagators/interface/Propagator.h"
#include "TrackingTools/TrajectoryParametrization/interface/GlobalTrajectoryParameters.h"
#include "TrackingTools/TrajectoryState/interface/FreeTrajectoryState.h"
#include "TrackingTools/TrajectoryState/interface/TrajectoryStateOnSurface.h"
#include "DataFormats/EcalDetId/interface/EcalSubdetector.h"
#include "DataFormats/DetId/interface/DetId.h"
#include "DataFormats/JetReco/interface/CaloJet.h"
#include "Geometry/CaloGeometry/interface/CaloSubdetectorGeometry.h"

// -----------------------------------------------------------------------------
//
JetTracksAssociationXtrpCalo::JetTracksAssociationXtrpCalo() 
{}

// -----------------------------------------------------------------------------
//
JetTracksAssociationXtrpCalo::~JetTracksAssociationXtrpCalo() 
{}


// -----------------------------------------------------------------------------
//

void JetTracksAssociationXtrpCalo::produce( Association* fAssociation,
                                            JetRefs const & fJets,
                                            std::vector<reco::TrackExtrapolation> const & fExtrapolations,
                                            CaloGeometry const & fGeo,
                                            double dR )
{
  for ( JetRefs::const_iterator jetsBegin = fJets.begin(),
          jetsEnd = fJets.end(), 
          ijet = jetsBegin;
        ijet != jetsEnd; ++ijet ) {
    reco::TrackRefVector associated;
    associateInputTracksToJet( associated, **ijet, fExtrapolations, dR );
    reco::JetTracksAssociation::setValue( fAssociation, *ijet, associated );
  }
  
  
}



void JetTracksAssociationXtrpCalo::associateInputTracksToJet( reco::TrackRefVector& associated,
                                                              const reco::Jet& fJet,
                                                              std::vector<reco::TrackExtrapolation> const & fExtrapolations,
                                                              double dR ) 
{
  reco::CaloJet const * pCaloJet = dynamic_cast<reco::CaloJet const *>(&fJet);
  if ( pCaloJet == 0 ) {
    throw cms::Exception("InvalidInput") << "Expecting calo jets only in JetTracksAssociationXtrpCalo";
  }
  // Loop over CaloTowers
  double jetPhi = pCaloJet->phi();
  double jetEta = pCaloJet->detectorP4().eta();

  // now cache the mapping of (det ID --> track)

//  std::cout<<" New jet "<<jetEta<<" "<<jetPhi<<" Jet ET "<<pCaloJet->et()<<std::endl;

  for ( std::vector<reco::TrackExtrapolation>::const_iterator xtrpBegin = fExtrapolations.begin(),
          xtrpEnd = fExtrapolations.end(), ixtrp = xtrpBegin;
        ixtrp != xtrpEnd; ++ixtrp ) {
//      
// Do nothing with invalid propagation  
//
        if( ixtrp->isValid().at(0) == 0 ) continue;
        
    reco::TrackBase::Point const & point = ixtrp->positions().at(0);


    double dr = reco::deltaR<double>( jetEta, jetPhi, point.eta(), point.phi() );
    if ( dr < dR ) {

//    std::cout<<" JetTracksAssociationXtrpCalo::associateInputTracksToJet:: initial track "<<ixtrp->track()->pt()<<" "<<ixtrp->track()->eta()<<
//    " "<<ixtrp->track()->phi()<< " Extrapolated position "<<point.eta()<<" "<<point.phi()<<" Valid? "<<ixtrp->isValid().at(0)<<" Jet eta, phi "<<jetEta<<" "<<jetPhi<<" Jet ET "<<pCaloJet->et()<<
//    " dr "<<dr<<" dR "<<dR<<std::endl;

      reco::TrackRef matchedTrack = ixtrp->track(); 
      associated.push_back( matchedTrack );      
    }
  }


}