/data/refman/pasoursint/CMSSW_5_3_1/src/RecoTracker/TrackProducer/src/GsfTrackProducerBase.cc

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#include "RecoTracker/TrackProducer/interface/GsfTrackProducerBase.h"
// system include files
#include <memory>
// user include files
#include "FWCore/Framework/interface/Frameworkfwd.h"
#include "FWCore/Framework/interface/MakerMacros.h"
#include "FWCore/MessageLogger/interface/MessageLogger.h"
#include "DataFormats/GsfTrackReco/interface/GsfTrackExtra.h"
#include "DataFormats/GsfTrackReco/interface/GsfTrackFwd.h"
#include "TrackingTools/GeomPropagators/interface/Propagator.h"
#include "TrackingTools/GeomPropagators/interface/AnalyticalPropagator.h"
#include "TrackingTools/GsfTools/interface/GsfPropagatorAdapter.h"
#include "TrackingTools/GsfTools/interface/MultiGaussianStateTransform.h"
#include "TrackingTools/GsfTools/interface/MultiGaussianState1D.h"
#include "TrackingTools/GsfTools/interface/GaussianSumUtilities1D.h"
#include "TrackingTools/PatternTools/interface/TransverseImpactPointExtrapolator.h"
#include "TrackingTools/PatternTools/interface/TSCBLBuilderNoMaterial.h"
#include "TrackingTools/PatternTools/interface/Trajectory.h"
#include "TrackingTools/PatternTools/interface/CollinearFitAtTM.h"

#include "TrackingTools/GsfTracking/interface/TrajGsfTrackAssociation.h"

#include "Geometry/TrackerGeometryBuilder/interface/TrackerGeometry.h"
#include "DataFormats/SiStripDetId/interface/SiStripDetId.h"

void 
GsfTrackProducerBase::putInEvt(edm::Event& evt,
                               const Propagator* prop,
                               const MeasurementTracker* measTk,
                               std::auto_ptr<TrackingRecHitCollection>& selHits,
                               std::auto_ptr<reco::GsfTrackCollection>& selTracks,
                               std::auto_ptr<reco::TrackExtraCollection>& selTrackExtras,
                               std::auto_ptr<reco::GsfTrackExtraCollection>& selGsfTrackExtras,
                               std::auto_ptr<std::vector<Trajectory> >&   selTrajectories,
                               AlgoProductCollection& algoResults,
                               const reco::BeamSpot& bs)
{

  TrackingRecHitRefProd rHits = evt.getRefBeforePut<TrackingRecHitCollection>();
  reco::TrackExtraRefProd rTrackExtras = evt.getRefBeforePut<reco::TrackExtraCollection>();
  reco::GsfTrackExtraRefProd rGsfTrackExtras = evt.getRefBeforePut<reco::GsfTrackExtraCollection>();
  reco::GsfTrackRefProd rTracks = evt.getRefBeforePut<reco::GsfTrackCollection>();

  edm::Ref<reco::TrackExtraCollection>::key_type idx = 0;
  edm::Ref<reco::TrackExtraCollection>::key_type hidx = 0;
  edm::Ref<reco::GsfTrackExtraCollection>::key_type idxGsf = 0;
  edm::Ref<reco::GsfTrackCollection>::key_type iTkRef = 0;
  edm::Ref< std::vector<Trajectory> >::key_type iTjRef = 0;
  std::map<unsigned int, unsigned int> tjTkMap;

  TSCBLBuilderNoMaterial tscblBuilder;
  
  for(AlgoProductCollection::iterator i=algoResults.begin(); i!=algoResults.end();i++){
    Trajectory * theTraj = (*i).first;
    if(trajectoryInEvent_) {
      selTrajectories->push_back(*theTraj);
      iTjRef++;
    }

    // const TrajectoryFitter::RecHitContainer& transHits = theTraj->recHits(useSplitting);  // NO: the return type in Trajectory is by VALUE
    TrajectoryFitter::RecHitContainer transHits = theTraj->recHits(useSplitting);
    reco::GsfTrack * theTrack = (*i).second.first;
    PropagationDirection seedDir = (*i).second.second;  
    
    LogDebug("TrackProducer") << "In GsfTrackProducerBase::putInEvt - seedDir=" << seedDir;

    reco::GsfTrack t = * theTrack;
    selTracks->push_back( t );
    iTkRef++;

    // Store indices in local map (starts at 0)
    if(trajectoryInEvent_) tjTkMap[iTjRef-1] = iTkRef-1;

    //sets the outermost and innermost TSOSs
    TrajectoryStateOnSurface outertsos;
    TrajectoryStateOnSurface innertsos;
    unsigned int innerId, outerId;
    
    // ---  NOTA BENE: the convention is to sort hits and measurements "along the momentum".
    // This is consistent with innermost and outermost labels only for tracks from LHC collision
    if (theTraj->direction() == alongMomentum) {
      outertsos = theTraj->lastMeasurement().updatedState();
      innertsos = theTraj->firstMeasurement().updatedState();
      outerId = theTraj->lastMeasurement().recHit()->geographicalId().rawId();
      innerId = theTraj->firstMeasurement().recHit()->geographicalId().rawId();
    } else { 
      outertsos = theTraj->firstMeasurement().updatedState();
      innertsos = theTraj->lastMeasurement().updatedState();
      outerId = theTraj->firstMeasurement().recHit()->geographicalId().rawId();
      innerId = theTraj->lastMeasurement().recHit()->geographicalId().rawId();
    }
    //build the TrackExtra
    GlobalPoint v = outertsos.globalParameters().position();
    GlobalVector p = outertsos.globalParameters().momentum();
    math::XYZVector outmom( p.x(), p.y(), p.z() );
    math::XYZPoint  outpos( v.x(), v.y(), v.z() );
    v = innertsos.globalParameters().position();
    p = innertsos.globalParameters().momentum();
    math::XYZVector inmom( p.x(), p.y(), p.z() );
    math::XYZPoint  inpos( v.x(), v.y(), v.z() );

    reco::TrackExtraRef teref= reco::TrackExtraRef ( rTrackExtras, idx ++ );
    reco::GsfTrack & track = selTracks->back();
    track.setExtra( teref );
    
    //======= I want to set the second hitPattern here =============
    if (theSchool.isValid())
      {
        NavigationSetter setter( *theSchool );
        setSecondHitPattern(theTraj,track,prop,measTk);
      }
    //==============================================================
    
    selTrackExtras->push_back( reco::TrackExtra (outpos, outmom, true, inpos, inmom, true,
                                                 outertsos.curvilinearError(), outerId,
                                                 innertsos.curvilinearError(), innerId,
                                                 seedDir, theTraj->seedRef()));


    reco::TrackExtra & tx = selTrackExtras->back();


    size_t ih = 0;
    // ---  NOTA BENE: the convention is to sort hits and measurements "along the momentum".
    // This is consistent with innermost and outermost labels only for tracks from LHC collisions
    if (theTraj->direction() == alongMomentum) {
      for( TrajectoryFitter::RecHitContainer::const_iterator j = transHits.begin();
           j != transHits.end(); j ++ ) {
        if ((**j).hit()!=0){
          TrackingRecHit * hit = (**j).hit()->clone();
          track.setHitPattern( * hit, ih ++ );
          selHits->push_back( hit );
          tx.add( TrackingRecHitRef( rHits, hidx ++ ) );
        }
      }
    }else{
      for( TrajectoryFitter::RecHitContainer::const_iterator j = transHits.end()-1;
           j != transHits.begin()-1; --j ) {
        if ((**j).hit()!=0){
          TrackingRecHit * hit = (**j).hit()->clone();
          track.setHitPattern( * hit, ih ++ );
          selHits->push_back( hit );
        tx.add( TrackingRecHitRef( rHits, hidx ++ ) );
        }
      }
    }
    // ----

    std::vector<reco::GsfTangent> tangents;
    const Trajectory::DataContainer& measurements = theTraj->measurements();
    if ( measurements.size()>2 ) {
      tangents.reserve(measurements.size()-2);
      Trajectory::DataContainer::const_iterator ibegin,iend;
      int increment(0);
      if (theTraj->direction() == alongMomentum) {
        ibegin = measurements.begin() + 1;
        iend = measurements.end() - 1;
        increment = 1;
      }
      else {
        ibegin = measurements.end() - 2;
        iend = measurements.begin();
        increment = -1;
      }
      math::XYZPoint position;
      math::XYZVector momentum;
      Measurement1D deltaP;
      // only measurements on "mono" detectors
      for ( Trajectory::DataContainer::const_iterator i=ibegin;
            i!=iend; i+=increment ) {
        if ( i->recHit().get() ) {
          DetId detId(i->recHit()->geographicalId());
          if ( detId.det()==DetId::Tracker ) {
            int subdetId = detId.subdetId();
            if ( subdetId==SiStripDetId::TIB || subdetId==SiStripDetId::TID || 
                 subdetId==SiStripDetId::TOB || subdetId==SiStripDetId::TEC ) {
              if ( SiStripDetId(detId).stereo() )  continue;        
            }
          }
        }
        bool valid = computeModeAtTM(*i,position,momentum,deltaP);
        if ( valid ) {
          tangents.push_back(reco::GsfTangent(position,momentum,deltaP));
        }
      }
    }
    

    //build the GsfTrackExtra
    std::vector<reco::GsfComponent5D> outerStates;
    outerStates.reserve(outertsos.components().size());
    fillStates(outertsos,outerStates);
    std::vector<reco::GsfComponent5D> innerStates;
    innerStates.reserve(innertsos.components().size());
    fillStates(innertsos,innerStates);
    

    reco::GsfTrackExtraRef terefGsf = reco::GsfTrackExtraRef ( rGsfTrackExtras, idxGsf ++ );
    track.setGsfExtra( terefGsf );
    selGsfTrackExtras->push_back( reco::GsfTrackExtra (outerStates, outertsos.localParameters().pzSign(),
                                                       innerStates, innertsos.localParameters().pzSign(),
                                                       tangents));

    if ( innertsos.isValid() ) {
      GsfPropagatorAdapter gsfProp(AnalyticalPropagator(innertsos.magneticField(),anyDirection));
      TransverseImpactPointExtrapolator tipExtrapolator(gsfProp);
      fillMode(track,innertsos,gsfProp,tipExtrapolator,tscblBuilder,bs);
    }

    delete theTrack;
    delete theTraj;
  }

  LogTrace("TrackingRegressionTest") << "========== TrackProducer Info ===================";
  LogTrace("TrackingRegressionTest") << "number of finalGsfTracks: " << selTracks->size();
  for (reco::GsfTrackCollection::const_iterator it = selTracks->begin(); it != selTracks->end(); it++) {
    LogTrace("TrackingRegressionTest") << "track's n valid and invalid hit, chi2, pt : " 
                                       << it->found() << " , " 
                                       << it->lost()  <<" , " 
                                       << it->normalizedChi2() << " , "
                                       << it->pt() << " , "
                                       << it->eta() ;
  }
  LogTrace("TrackingRegressionTest") << "=================================================";
  

  rTracks_ = evt.put( selTracks );
  evt.put( selTrackExtras );
  evt.put( selGsfTrackExtras );
  evt.put( selHits );

  if(trajectoryInEvent_) {
    edm::OrphanHandle<std::vector<Trajectory> > rTrajs = evt.put(selTrajectories);

    // Now Create traj<->tracks association map
    std::auto_ptr<TrajGsfTrackAssociationCollection> trajTrackMap( new TrajGsfTrackAssociationCollection() );
    for ( std::map<unsigned int, unsigned int>::iterator i = tjTkMap.begin(); 
          i != tjTkMap.end(); i++ ) {
      edm::Ref<std::vector<Trajectory> > trajRef( rTrajs, (*i).first );
      edm::Ref<reco::GsfTrackCollection>    tkRef( rTracks_, (*i).second );
      trajTrackMap->insert( edm::Ref<std::vector<Trajectory> >( rTrajs, (*i).first ),
                            edm::Ref<reco::GsfTrackCollection>( rTracks_, (*i).second ) );
    }
    evt.put( trajTrackMap );
  }
}

void
GsfTrackProducerBase::fillStates (TrajectoryStateOnSurface tsos,
                                  std::vector<reco::GsfComponent5D>& states) const
{
  reco::GsfComponent5D::ParameterVector pLocS;
  reco::GsfComponent5D::CovarianceMatrix cLocS;
  std::vector<TrajectoryStateOnSurface> components(tsos.components());
  for ( std::vector<TrajectoryStateOnSurface>::const_iterator i=components.begin();
        i!=components.end(); ++i ) {
    states.push_back(reco::GsfComponent5D(i->weight(),i->localParameters().vector(),i->localError().matrix()));
  }
}

void
GsfTrackProducerBase::fillMode (reco::GsfTrack& track, const TrajectoryStateOnSurface innertsos,
                                const Propagator& gsfProp,
                                const TransverseImpactPointExtrapolator& tipExtrapolator,
                                TrajectoryStateClosestToBeamLineBuilder& tscblBuilder,
                                const reco::BeamSpot& bs) const
{
  // Get transverse impact parameter plane (from mean). This is a first approximation;
  // the mode is then extrapolated to the
  // final position closest to the beamline.
  GlobalPoint bsPos(bs.position().x()+(track.vz()-bs.position().z())*bs.dxdz(),
                    bs.position().y()+(track.vz()-bs.position().z())*bs.dydz(),
                    track.vz());
  TrajectoryStateOnSurface vtxTsos = tipExtrapolator.extrapolate(innertsos,bsPos);
  if ( !vtxTsos.isValid() )  vtxTsos = innertsos;
  // extrapolate mixture
  vtxTsos = gsfProp.propagate(innertsos,vtxTsos.surface());
  if ( !vtxTsos.isValid() )  return;              // failed (GsfTrack keeps mode = mean)
  // extract mode
  // build perigee parameters (for covariance to be stored)
  AlgebraicVector5 modeParameters;
  AlgebraicSymMatrix55 modeCovariance;
  // set parameters and variances for "mode" state (local parameters)
  for ( unsigned int iv=0; iv<5; ++iv ) {
    MultiGaussianState1D state1D = MultiGaussianStateTransform::multiState1D(vtxTsos,iv);
    GaussianSumUtilities1D utils(state1D);
    modeParameters(iv) = utils.mode().mean();
    modeCovariance(iv,iv) = utils.mode().variance();
    if ( !utils.modeIsValid() ) {
      // if mode calculation fails: use mean
      modeParameters(iv) = utils.mean();
      modeCovariance(iv,iv) = utils.variance();
    }
  }
  // complete covariance matrix
  // approximation: use correlations from mean
  const AlgebraicSymMatrix55& meanCovariance(vtxTsos.localError().matrix());
  for ( unsigned int iv1=0; iv1<5; ++iv1 ) {
    for ( unsigned int iv2=0; iv2<iv1; ++iv2 ) {
      double cov12 = meanCovariance(iv1,iv2) * 
        sqrt(modeCovariance(iv1,iv1)/meanCovariance(iv1,iv1)*
             modeCovariance(iv2,iv2)/meanCovariance(iv2,iv2));
      modeCovariance(iv1,iv2) = modeCovariance(iv2,iv1) = cov12;
    }
  }
  TrajectoryStateOnSurface modeTsos(LocalTrajectoryParameters(modeParameters,
                                                              vtxTsos.localParameters().pzSign()),
                                    LocalTrajectoryError(modeCovariance),
                                    vtxTsos.surface(),
                                    vtxTsos.magneticField(),
                                    vtxTsos.surfaceSide());
  TrajectoryStateClosestToBeamLine tscbl = tscblBuilder(*modeTsos.freeState(),bs);
  if ( !tscbl.isValid() )  return;            // failed (GsfTrack keeps mode = mean)
  //
  // extract state at PCA and create momentum vector and covariance matrix
  //
  FreeTrajectoryState fts = tscbl.trackStateAtPCA();
  GlobalVector tscblMom = fts.momentum();
  reco::GsfTrack::Vector mom(tscblMom.x(),tscblMom.y(),tscblMom.z());
  reco::GsfTrack::CovarianceMatrixMode cov;
  const AlgebraicSymMatrix55& tscblCov = fts.curvilinearError().matrix();
  for ( unsigned int iv1=0; iv1<reco::GsfTrack::dimensionMode; ++iv1 ) {
    for ( unsigned int iv2=0; iv2<reco::GsfTrack::dimensionMode; ++iv2 ) {
      cov(iv1,iv2) = tscblCov(iv1,iv2);
    }
  } 
  track.setMode(fts.charge(),mom,cov);
}

void
GsfTrackProducerBase::localParametersFromQpMode (const TrajectoryStateOnSurface tsos,
                                                 AlgebraicVector5& parameters,
                                                 AlgebraicSymMatrix55& covariance) const
{
  //
  // parameters and errors from combined state
  //
  parameters = tsos.localParameters().vector();
  covariance = tsos.localError().matrix();
  //
  // mode for parameter 0 (q/p)
  //
  MultiGaussianState1D qpState(MultiGaussianStateTransform::multiState1D(tsos,0));
  GaussianSumUtilities1D qpGS(qpState);
  if ( !qpGS.modeIsValid() )  return;
  double qp = qpGS.mode().mean();
  double varQp = qpGS.mode().variance();
  //
  // replace q/p value and variance, rescale correlation terms
  //   (heuristic procedure - alternative would be mode in 5D ...)
  //
  double VarQpRatio = sqrt(varQp/covariance(0,0));
  parameters(0) = qp;
  covariance(0,0) = varQp;
  for ( int i=1; i<5; ++i )  covariance(i,0) *= VarQpRatio;
}

bool
GsfTrackProducerBase::computeModeAtTM (const TrajectoryMeasurement& tm,
                                       reco::GsfTrackExtra::Point& position,
                                       reco::GsfTrackExtra::Vector& momentum,
                                       Measurement1D& deltaP) const
{  
  //
  // states
  //
  TrajectoryStateOnSurface fwdState = tm.forwardPredictedState();
  TrajectoryStateOnSurface bwdState = tm.backwardPredictedState();
  TrajectoryStateOnSurface upState  = tm.updatedState();


  if ( !fwdState.isValid() || !bwdState.isValid() || !upState.isValid() ) {
    return false;
  }
  //
  // position from mean, momentum from mode (in cartesian coordinates)
  //  following PF code
  //
  GlobalPoint pos = upState.globalPosition();
  position = reco::GsfTrackExtra::Point(pos.x(),pos.y(),pos.z());
  MultiTrajectoryStateMode mts;
  GlobalVector mom;
  bool result = mts.momentumFromModeCartesian(upState,mom);
  if ( !result ) {
//     std::cout << "momentumFromModeCartesian failed" << std::endl;
    return false;
  }
  momentum = reco::GsfTrackExtra::Vector(mom.x(),mom.y(),mom.z());
  //
  // calculation from deltaP from fit to forward & backward predictions
  //  (momentum from mode) and hit
  //
  // prepare input parameter vectors and covariance matrices
  AlgebraicVector5 fwdPars = fwdState.localParameters().vector();
  AlgebraicSymMatrix55 fwdCov = fwdState.localError().matrix();
  localParametersFromQpMode(fwdState,fwdPars,fwdCov);
  AlgebraicVector5 bwdPars = bwdState.localParameters().vector();
  AlgebraicSymMatrix55 bwdCov = bwdState.localError().matrix();
  localParametersFromQpMode(bwdState,bwdPars,bwdCov);
  LocalPoint hitPos(0.,0.,0.);
  LocalError hitErr(-1.,-1.,-1.);
  if ( tm.recHit()->isValid() ) {
    hitPos = tm.recHit()->localPosition();
    hitErr = tm.recHit()->localPositionError();
  }    
  CollinearFitAtTM2 collinearFit(fwdPars,fwdCov,bwdPars,bwdCov,hitPos,hitErr);
  deltaP = collinearFit.deltaP();

  return true;
}