/data/refman/pasoursint/CMSSW_5_3_4/src/Alignment/ReferenceTrajectories/plugins/DualBzeroTrajectoryFactory.cc

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#include "FWCore/Framework/interface/ESHandle.h"
#include "FWCore/Framework/interface/EventSetup.h"
#include "FWCore/ParameterSet/interface/ParameterSet.h"
#include "FWCore/MessageLogger/interface/MessageLogger.h"
#include "MagneticField/Records/interface/IdealMagneticFieldRecord.h" 
#include "Alignment/ReferenceTrajectories/interface/TrajectoryFactoryPlugin.h"
#include "TrackingTools/GeomPropagators/interface/AnalyticalPropagator.h"

#include <algorithm>

#include "Alignment/ReferenceTrajectories/interface/DualBzeroReferenceTrajectory.h" 

#include "Alignment/ReferenceTrajectories/interface/TrajectoryFactoryBase.h"



class DualBzeroTrajectoryFactory : public TrajectoryFactoryBase
{
public:
  DualBzeroTrajectoryFactory(const edm::ParameterSet &config);
  virtual ~DualBzeroTrajectoryFactory();

  virtual const ReferenceTrajectoryCollection trajectories(const edm::EventSetup &setup,
                                                           const ConstTrajTrackPairCollection &tracks,
                                                            const reco::BeamSpot &beamSpot) const;

  virtual const ReferenceTrajectoryCollection trajectories(const edm::EventSetup &setup,
                                                           const ConstTrajTrackPairCollection &tracks,
                                                           const ExternalPredictionCollection &external,
                                                           const reco::BeamSpot &beamSpot) const;

  virtual DualBzeroTrajectoryFactory* clone() const { return new DualBzeroTrajectoryFactory(*this); }

protected:
  struct DualBzeroTrajectoryInput
  {
    TrajectoryStateOnSurface refTsos;
    TransientTrackingRecHit::ConstRecHitContainer fwdRecHits;
    TransientTrackingRecHit::ConstRecHitContainer bwdRecHits;
  };

  const DualBzeroTrajectoryInput referenceStateAndRecHits(const ConstTrajTrackPair &track) const;

  const TrajectoryStateOnSurface propagateExternal(const TrajectoryStateOnSurface &external,
                                                   const Surface &surface,
                                                   const MagneticField *magField) const;

  double theMass;
  double theMomentumEstimate;
  
};


DualBzeroTrajectoryFactory::DualBzeroTrajectoryFactory( const edm::ParameterSet & config ) :
  TrajectoryFactoryBase( config )
{
  theMass = config.getParameter< double >( "ParticleMass" );
  theMomentumEstimate = config.getParameter< double >( "MomentumEstimate" );
}

 
DualBzeroTrajectoryFactory::~DualBzeroTrajectoryFactory( void ) {}


const DualBzeroTrajectoryFactory::ReferenceTrajectoryCollection
DualBzeroTrajectoryFactory::trajectories(const edm::EventSetup  &setup,
                                         const ConstTrajTrackPairCollection &tracks,
                                         const reco::BeamSpot &beamSpot) const
{
  ReferenceTrajectoryCollection trajectories;

  edm::ESHandle< MagneticField > magneticField;
  setup.get< IdealMagneticFieldRecord >().get( magneticField );

  ConstTrajTrackPairCollection::const_iterator itTracks = tracks.begin();

  while ( itTracks != tracks.end() )
  { 
    const DualBzeroTrajectoryInput input = this->referenceStateAndRecHits( *itTracks );
    // Check input: If all hits were rejected, the TSOS is initialized as invalid.
    if ( input.refTsos.isValid() )
    {
      ReferenceTrajectoryPtr ptr( new DualBzeroReferenceTrajectory( input.refTsos,
                                                                    input.fwdRecHits,
                                                                    input.bwdRecHits,
                                                                    magneticField.product(),
                                                                    materialEffects(),
                                                                    propagationDirection(),
                                                                    theMass,
                                                                    theMomentumEstimate,
                                                                    theUseBeamSpot, beamSpot) );
      trajectories.push_back( ptr );
    }

    ++itTracks;
  }

  return trajectories;
}

const DualBzeroTrajectoryFactory::ReferenceTrajectoryCollection
DualBzeroTrajectoryFactory::trajectories(const edm::EventSetup &setup,
                                         const ConstTrajTrackPairCollection &tracks,
                                         const ExternalPredictionCollection &external,
                                         const reco::BeamSpot &beamSpot) const
{
  ReferenceTrajectoryCollection trajectories;

  if ( tracks.size() != external.size() )
  {
    edm::LogInfo("ReferenceTrajectories") << "@SUB=DualBzeroTrajectoryFactory::trajectories"
                                          << "Inconsistent input:\n"
                                          << "\tnumber of tracks = " << tracks.size()
                                          << "\tnumber of external predictions = " << external.size();
    return trajectories;
  }

  edm::ESHandle< MagneticField > magneticField;
  setup.get< IdealMagneticFieldRecord >().get( magneticField );

  ConstTrajTrackPairCollection::const_iterator itTracks = tracks.begin();
  ExternalPredictionCollection::const_iterator itExternal = external.begin();

  while ( itTracks != tracks.end() )
  {
    const DualBzeroTrajectoryInput input = referenceStateAndRecHits( *itTracks );
    // Check input: If all hits were rejected, the TSOS is initialized as invalid.
    if ( input.refTsos.isValid() )
    {
      if ( (*itExternal).isValid() )
      {
        TrajectoryStateOnSurface propExternal =
          propagateExternal( *itExternal, input.refTsos.surface(), magneticField.product() );

        if ( !propExternal.isValid() ) continue;

        // set the flag for reversing the RecHits to false, since they are already in the correct order.
        ReferenceTrajectoryPtr ptr( new DualBzeroReferenceTrajectory( propExternal,
                                                                      input.fwdRecHits,
                                                                      input.bwdRecHits,
                                                                      magneticField.product(),
                                                                      materialEffects(),
                                                                      propagationDirection(),
                                                                      theMass,
                                                                      theMomentumEstimate,
                                                                      theUseBeamSpot, beamSpot ) );

        AlgebraicSymMatrix externalParamErrors( asHepMatrix<5>( propExternal.localError().matrix() ) );
        ptr->setParameterErrors( externalParamErrors.sub( 2, 5 ) );
        trajectories.push_back( ptr );
      }
      else
      {
// GF: Why is the following commented? That is different from the other factories
//     that usually have the non-external prediction ReferenceTrajectory as fall back...
//      ReferenceTrajectoryPtr ptr( new DualBzeroReferenceTrajectory( input.refTsos,
//                                                                    input.fwdRecHits,
//                                                                    input.bwdRecHits,
//                                                                    magneticField.product(),
//                                                                    materialEffects(),
//                                                                    propagationDirection(),
//                                                                    theMass,
//                                                                    theMomentumEstimate,
//                                                                    beamSpot ) );
        DualBzeroReferenceTrajectory test( input.refTsos,
                                           input.fwdRecHits,
                                           input.bwdRecHits,
                                           magneticField.product(),
                                           materialEffects(),
                                           propagationDirection(),
                                           theMass,
                                           theMomentumEstimate,
                                           theUseBeamSpot, beamSpot );

        //trajectories.push_back( ptr );
      }
    }

    ++itTracks;
    ++itExternal;
  }

  return trajectories;
}


const DualBzeroTrajectoryFactory::DualBzeroTrajectoryInput
DualBzeroTrajectoryFactory::referenceStateAndRecHits( const ConstTrajTrackPair& track ) const
{
  DualBzeroTrajectoryInput input;
 
  // get the trajectory measurements in the correct order, i.e. reverse if needed
  Trajectory::DataContainer allTrajMeas = this->orderedTrajectoryMeasurements( *track.first );
  Trajectory::DataContainer usedTrajMeas;
  Trajectory::DataContainer::iterator itM;
  // get all relevant trajectory measurements
  for ( itM = allTrajMeas.begin(); itM != allTrajMeas.end(); itM++ )
  {
    if ( useRecHit( ( *itM ).recHit() ) ) usedTrajMeas.push_back( *itM );
  }

  unsigned int iMeas = 0;
  unsigned int nMeas = usedTrajMeas.size();
  unsigned int nRefStateMeas = nMeas/2;
  // get the valid RecHits
  for ( itM = usedTrajMeas.begin(); itM != usedTrajMeas.end(); itM++, iMeas++ )
  {
    TransientTrackingRecHit::ConstRecHitPointer aRecHit = ( *itM ).recHit();

    if ( iMeas < nRefStateMeas ) {
      input.bwdRecHits.push_back( aRecHit );
    } else if ( iMeas > nRefStateMeas ) {
      input.fwdRecHits.push_back( aRecHit );
    } else { // iMeas == nRefStateMeas
      if ( ( *itM ).updatedState().isValid() )
      {
        input.refTsos = ( *itM ).updatedState();
        input.bwdRecHits.push_back( aRecHit );
        input.fwdRecHits.push_back( aRecHit );
      } else {
        // if the tsos of the middle hit is not valid, try the next one ...
        nRefStateMeas++;
        input.bwdRecHits.push_back( aRecHit );
      }
    }
  }

  // bring input.fwdRecHits into correct order
  std::reverse( input.bwdRecHits.begin(), input.bwdRecHits.end() );

  return input;
}

const TrajectoryStateOnSurface
DualBzeroTrajectoryFactory::propagateExternal( const TrajectoryStateOnSurface& external,
                                          const Surface& surface,
                                          const MagneticField* magField ) const
{
  AnalyticalPropagator propagator( magField, anyDirection );
  const std::pair< TrajectoryStateOnSurface, double > tsosWithPath =
    propagator.propagateWithPath( external, surface );
  return tsosWithPath.first;
}


DEFINE_EDM_PLUGIN( TrajectoryFactoryPlugin, DualBzeroTrajectoryFactory, "DualBzeroTrajectoryFactory" );