/afs/cern.ch/work/a/aaltunda/public/www/CMSSW_5_3_13_patch3/src/RecoTracker/TrackProducer/src/TrackProducerAlgorithm.cc

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#include "RecoTracker/TrackProducer/interface/TrackProducerAlgorithm.h"

#include "DataFormats/Common/interface/OrphanHandle.h"
#include "FWCore/MessageLogger/interface/MessageLogger.h"

#include "MagneticField/Engine/interface/MagneticField.h"
#include "Geometry/CommonDetUnit/interface/TrackingGeometry.h"

#include "DataFormats/TrajectorySeed/interface/TrajectorySeed.h"
#include "DataFormats/TrackCandidate/interface/TrackCandidate.h"
#include "DataFormats/TrackingRecHit/interface/TrackingRecHitFwd.h"

#include "TrackingTools/TrackFitters/interface/TrajectoryFitter.h"
#include "TrackingTools/TrajectoryState/interface/TrajectoryStateOnSurface.h"
#include "TrackingTools/TrajectoryState/interface/TrajectoryStateTransform.h"
#include "TrackingTools/TransientTrackingRecHit/interface/TransientTrackingRecHitBuilder.h"
#include "RecoTracker/TransientTrackingRecHit/interface/TkTransientTrackingRecHitBuilder.h"
#include "TrackingTools/PatternTools/interface/TransverseImpactPointExtrapolator.h"
#include "TrackingTools/TransientTrack/interface/TransientTrack.h"
#include "RecoTracker/TrackProducer/interface/TrackingRecHitLessFromGlobalPosition.h"

#include "TrackingTools/PatternTools/interface/TSCBLBuilderNoMaterial.h"
#include "Utilities/General/interface/CMSexception.h"

#include "RecoTracker/TransientTrackingRecHit/interface/TRecHit2DPosConstraint.h"
#include "RecoTracker/TransientTrackingRecHit/interface/TRecHit1DMomConstraint.h"
// #include "TrackingTools/MaterialEffects/interface/PropagatorWithMaterial.h"
#include "DataFormats/GeometryCommonDetAlgo/interface/ErrorFrameTransformer.h"
#include "TrackingTools/TrackFitters/interface/RecHitSorter.h"
#include "DataFormats/TrackReco/interface/TrackBase.h"

template <> bool
TrackProducerAlgorithm<reco::Track>::buildTrack (const TrajectoryFitter * theFitter,
                                                 const Propagator * thePropagator,
                                                 AlgoProductCollection& algoResults,
                                                 TransientTrackingRecHit::RecHitContainer& hits,
                                                 TrajectoryStateOnSurface& theTSOS,
                                                 const TrajectorySeed& seed,
                                                 float ndof,
                                                 const reco::BeamSpot& bs,
                                                 SeedRef seedRef,
                                                 int qualityMask,signed char nLoops)                                             
{
  //variable declarations
  std::vector<Trajectory> trajVec;
  reco::Track * theTrack;
  Trajectory * theTraj; 
  PropagationDirection seedDir = seed.direction();
      
  //perform the fit: the result's size is 1 if it succeded, 0 if fails
  if(nLoops>0)
    trajVec = theFitter->fit(seed, hits, theTSOS,TrajectoryFitter::looper);
  else
    trajVec = theFitter->fit(seed, hits, theTSOS,TrajectoryFitter::standard);
  
  LogDebug("TrackProducer") <<" FITTER FOUND "<< trajVec.size() << " TRAJECTORIES" <<"\n";
  TrajectoryStateOnSurface innertsos;
  
  if (trajVec.size() != 0){
    theTraj = new Trajectory( trajVec.front() );
    theTraj->setSeedRef(seedRef);
    
    if (theTraj->direction() == alongMomentum) {
      innertsos = theTraj->firstMeasurement().updatedState();
    } else { 
      innertsos = theTraj->lastMeasurement().updatedState();
    }
    
    ndof = 0;
    TransientTrackingRecHit::RecHitContainer validHits;
    theTraj->validRecHits(validHits);
    for (TransientTrackingRecHit::RecHitContainer::iterator h=validHits.begin();h!=validHits.end();++h)
      ndof = ndof + ((*h)->dimension())*((*h)->weight());
    if (theTSOS.magneticField()->inTesla(GlobalPoint(0,0,0)).mag2()<DBL_MIN) ndof = ndof - 4;
    else ndof = ndof - 5;
    
    TSCBLBuilderNoMaterial tscblBuilder;
    //    const FreeTrajectoryState & stateForProjectionToBeamLine=*innertsos.freeState();
    const TrajectoryStateOnSurface & stateForProjectionToBeamLineOnSurface = theTraj->closestMeasurement(GlobalPoint(bs.x0(),bs.y0(),bs.z0())).updatedState();
    if (!stateForProjectionToBeamLineOnSurface.isValid()){
      edm::LogError("CannotPropagateToBeamLine")<<"the state on the closest measurement isnot valid. skipping track.";
      delete theTraj;
      return false;
    }
    const FreeTrajectoryState & stateForProjectionToBeamLine=*stateForProjectionToBeamLineOnSurface.freeState();

    LogDebug("TrackProducer") << "stateForProjectionToBeamLine=" << stateForProjectionToBeamLine;

    TrajectoryStateClosestToBeamLine tscbl = tscblBuilder(stateForProjectionToBeamLine,bs);

    if (tscbl.isValid()==false) {
        delete theTraj;
        return false;
    }

    GlobalPoint v = tscbl.trackStateAtPCA().position();
    math::XYZPoint  pos( v.x(), v.y(), v.z() );
    GlobalVector p = tscbl.trackStateAtPCA().momentum();
    math::XYZVector mom( p.x(), p.y(), p.z() );

    LogDebug("TrackProducer") << "pos=" << v << " mom=" << p << " pt=" << p.perp() << " mag=" << p.mag();

    theTrack = new reco::Track(theTraj->chiSquared(),
                               int(ndof),//FIXME fix weight() in TrackingRecHit
                               pos, mom, tscbl.trackStateAtPCA().charge(), 
                               tscbl.trackStateAtPCA().curvilinearError(),
                               algo_);
   
    theTrack->setQualityMask(qualityMask);
    theTrack->setNLoops(nLoops);

    LogDebug("TrackProducer") << "theTrack->pt()=" << theTrack->pt();

    LogDebug("TrackProducer") <<"track done\n";

    AlgoProduct aProduct(theTraj,std::make_pair(theTrack,seedDir));
    algoResults.push_back(aProduct);
    
    return true;
  } 
  else  return false;
}

template <> bool
TrackProducerAlgorithm<reco::GsfTrack>::buildTrack (const TrajectoryFitter * theFitter,
                                                    const Propagator * thePropagator,
                                                    AlgoProductCollection& algoResults,
                                                    TransientTrackingRecHit::RecHitContainer& hits,
                                                    TrajectoryStateOnSurface& theTSOS,
                                                    const TrajectorySeed& seed,
                                                    float ndof,
                                                    const reco::BeamSpot& bs,
                                                    SeedRef seedRef,
                                                    int qualityMask,signed char nLoops)
{
  //variable declarations
  std::vector<Trajectory> trajVec;
  reco::GsfTrack * theTrack;
  Trajectory * theTraj; 
  PropagationDirection seedDir = seed.direction();
      
  //perform the fit: the result's size is 1 if it succeded, 0 if fails
  if(nLoops>0)
    trajVec = theFitter->fit(seed, hits, theTSOS,TrajectoryFitter::looper);
  else
    trajVec = theFitter->fit(seed, hits, theTSOS,TrajectoryFitter::standard);

  

  LogDebug("GsfTrackProducer") <<" FITTER FOUND "<< trajVec.size() << " TRAJECTORIES" <<"\n";
  
  TrajectoryStateOnSurface innertsos;
  TrajectoryStateOnSurface outertsos;
  
  if (trajVec.size() != 0){

    theTraj = new Trajectory( trajVec.front() );
    theTraj->setSeedRef(seedRef);
    
    if (theTraj->direction() == alongMomentum) {
      innertsos = theTraj->firstMeasurement().updatedState();
      outertsos = theTraj->lastMeasurement().updatedState();
    } else { 
      innertsos = theTraj->lastMeasurement().updatedState();
      outertsos = theTraj->firstMeasurement().updatedState();
    }
//     std::cout
//       << "Nr. of first / last states = "
//       << innertsos.components().size() << " "
//       << outertsos.components().size() << std::endl;
//     std::vector<TrajectoryStateOnSurface> components = 
//       innertsos.components();
//     double sinTheta = 
//       sin(innertsos.globalMomentum().theta());
//     for ( std::vector<TrajectoryStateOnSurface>::const_iterator ic=components.begin();
//        ic!=components.end(); ic++ ) {
//       std::cout << " comp " << ic-components.begin() << " "
//              << (*ic).weight() << " "
//              << (*ic).localParameters().vector()[0]/sinTheta << " "
//              << sqrt((*ic).localError().matrix()[0][0])/sinTheta << std::endl;
//     }
    
    ndof = 0;
    TransientTrackingRecHit::RecHitContainer validHits;
    theTraj->validRecHits(validHits);
    for (TransientTrackingRecHit::RecHitContainer::iterator h=validHits.begin();h!=validHits.end();++h)
      ndof = ndof + ((*h)->dimension())*((*h)->weight());
    if (theTSOS.magneticField()->inTesla(GlobalPoint(0,0,0)).mag2()<DBL_MIN) ndof = ndof - 4;
    else ndof = ndof - 5;
   
    TSCBLBuilderNoMaterial tscblBuilder;
    //    const FreeTrajectoryState & stateForProjectionToBeamLine=*innertsos.freeState();
    const TrajectoryStateOnSurface & stateForProjectionToBeamLineOnSurface = theTraj->closestMeasurement(GlobalPoint(bs.x0(),bs.y0(),bs.z0())).updatedState();
    if (!stateForProjectionToBeamLineOnSurface.isValid()){
      edm::LogError("CannotPropagateToBeamLine")<<"the state on the closest measurement isnot valid. skipping track.";
      delete theTraj;
      return false;
    }    const FreeTrajectoryState & stateForProjectionToBeamLine=*theTraj->closestMeasurement(GlobalPoint(bs.x0(),bs.y0(),bs.z0())).updatedState().freeState();

    LogDebug("TrackProducer") << "stateForProjectionToBeamLine=" << stateForProjectionToBeamLine;

    TrajectoryStateClosestToBeamLine tscbl = tscblBuilder(stateForProjectionToBeamLine,bs);

    if (tscbl.isValid()==false) {
        delete theTraj;
        return false;
    }

    GlobalPoint v = tscbl.trackStateAtPCA().position();
    math::XYZPoint  pos( v.x(), v.y(), v.z() );
    GlobalVector p = tscbl.trackStateAtPCA().momentum();
    math::XYZVector mom( p.x(), p.y(), p.z() );

    LogDebug("TrackProducer") << "pos=" << v << " mom=" << p << " pt=" << p.perp() << " mag=" << p.mag();

    theTrack = new reco::GsfTrack(theTraj->chiSquared(),
                                  int(ndof),//FIXME fix weight() in TrackingRecHit
                                  //                           theTraj->foundHits(),//FIXME to be fixed in Trajectory.h
                                  //                           0, //FIXME no corresponding method in trajectory.h
                                  //                           theTraj->lostHits(),//FIXME to be fixed in Trajectory.h
                                  pos, mom, tscbl.trackStateAtPCA().charge(), tscbl.trackStateAtPCA().curvilinearError());    
    theTrack->setAlgorithm(algo_);

    LogDebug("GsfTrackProducer") <<"track done\n";

    AlgoProduct aProduct(theTraj,std::make_pair(theTrack,seedDir));
    LogDebug("GsfTrackProducer") <<"track done1\n";
    algoResults.push_back(aProduct);
    LogDebug("GsfTrackProducer") <<"track done2\n";
    
    return true;
  } 
  else  return false;
}