SeedTransformer Class Reference

#include <SeedTransformer.h>

Public Member Functions
std::vector< Trajectory >	seedTransform (const TrajectorySeed &) const
	Performs the fit. More...
	SeedTransformer (const edm::ParameterSet &)
	Constructor. More...
TrajectoryStateOnSurface	seedTransientState (const TrajectorySeed &) const
void	setServices (const edm::EventSetup &)
	Set the services needed by the SeedTransformer. More...
virtual	~SeedTransformer ()
	Destructor. More...

Private Attributes
double	errorRescale
	Error rescale factor. More...
unsigned int	nMinRecHits
	Minimum number of RecHits required to perform the fit. More...
edm::ESHandle< TrajectoryFitter >	theFitter
std::string	theFitterName
edm::ESHandle< MagneticField >	theMagneticField
edm::ESHandle< TransientTrackingRecHitBuilder >	theMuonRecHitBuilder
std::string	theMuonRecHitBuilderName
edm::ESHandle< Propagator >	thePropagator
std::string	thePropagatorName
edm::ESHandle< GlobalTrackingGeometry >	theTrackingGeometry
bool	useSubRecHits

Detailed Description

Description: this class takes a TrajectorySeed, fits its RecHits and returns a vector of Trajectories. If the fit fails, the returned vector is empty.

Author

D. Trocino - University and INFN Torino

Definition at line 29 of file SeedTransformer.h.

Constructor & Destructor Documentation

SeedTransformer::SeedTransformer

(

const edm::ParameterSet &

iConfig

)

Constructor.

Definition at line 48 of file SeedTransformer.cc.

References edm::ParameterSet::getParameter(), LogTrace, and CombinatorialSeedGeneratorForCosmicsRegionalReconstruction_cfi::thePropagatorName.

                                                            {

  LogTrace("Reco|TrackingTools|SeedTransformer") << "SeedTransformer constructor called." << endl << endl;

  theFitterName = iConfig.getParameter<string>("Fitter");  
  theMuonRecHitBuilderName = iConfig.getParameter<string>("MuonRecHitBuilder");
  thePropagatorName = iConfig.getParameter<string>("Propagator");

  nMinRecHits = iConfig.getParameter<unsigned int>("NMinRecHits");
  errorRescale = iConfig.getParameter<double>("RescaleError");
  useSubRecHits = iConfig.getParameter<bool>("UseSubRecHits");
}

SeedTransformer::~SeedTransformer ( )

virtual

Destructor.

Definition at line 61 of file SeedTransformer.cc.

References LogTrace.

                                  {

  LogTrace("Reco|TrackingTools|SeedTransformer") << "SeedTransformer destructor called." << endl << endl;

}

Member Function Documentation

vector< Trajectory > SeedTransformer::seedTransform

(

const TrajectorySeed &

aSeed

)

const

Performs the fit.

Definition at line 77 of file SeedTransformer.cc.

References MuonTransientTrackingRecHitBreaker::breakInSubRecHits(), popcon2dropbox::copy(), TrajectoryStateOnSurface::isValid(), LogTrace, metname, TrajectorySeed::nHits(), and TrajectorySeed::recHits().

Referenced by DirectMuonTrajectoryBuilder::trajectories(), and StandAloneMuonTrajectoryBuilder::trajectories().

                                                                                   {

  const string metname = "Reco|TrackingTools|SeedTransformer";

  LogTrace(metname) << " Number of valid RecHits:      " << aSeed.nHits() << endl;

  if( aSeed.nHits() < nMinRecHits ) {
    LogTrace(metname) << "    --- Too few RecHits, no refit performed! ---" << endl;
    return vector<Trajectory>();
  }

  TrajectoryStateOnSurface aTSOS(seedTransientState(aSeed));

  // Rescale errors before refit, not to bias the result
  aTSOS.rescaleError(errorRescale);

  vector<TransientTrackingRecHit::ConstRecHitPointer> recHits;
  unsigned int countRH = 0;

  for(TrajectorySeed::recHitContainer::const_iterator itRecHits=aSeed.recHits().first; itRecHits!=aSeed.recHits().second; ++itRecHits, ++countRH) {
    if((*itRecHits).isValid()) {
      TransientTrackingRecHit::ConstRecHitPointer ttrh(theMuonRecHitBuilder->build(&(*itRecHits)));

      if(useSubRecHits){
    TransientTrackingRecHit::ConstRecHitContainer subHits =
      MuonTransientTrackingRecHitBreaker::breakInSubRecHits(ttrh,2);
    copy(subHits.begin(),subHits.end(),back_inserter(recHits));
      }
      else{
    recHits.push_back(ttrh);
      }    
    }
  } // end for(TrajectorySeed::recHitContainer::const_iterator itRecHits=aSeed.recHits().first; itRecHits!=aSeed.recHits().second; ++itRecHits, ++countRH)

  TrajectoryStateOnSurface aInitTSOS = thePropagator->propagate(aTSOS, recHits.front()->det()->surface());

  if(!aInitTSOS.isValid()) {
    LogTrace(metname) << "    --- Initial state for refit not valid! ---" << endl;
    return vector<Trajectory>();
  }

  vector<Trajectory> refittedSeed = theFitter->fit(aSeed, recHits, aInitTSOS);

  if(refittedSeed.empty()) {
    LogTrace(metname) << "    --- Seed fit failed! ---" << endl;
    return vector<Trajectory>();
  }

  else if(!refittedSeed.front().isValid()) {
    LogTrace(metname) << "    --- Seed fitted, but trajectory not valid! ---" << endl;
    return vector<Trajectory>();
  }

  else
    LogTrace(metname) << "    +++ Seed fit succeded! +++" << endl;

  return refittedSeed;

}

TrajectoryStateOnSurface SeedTransformer::seedTransientState

(

const TrajectorySeed &

tmpSeed

)

const

Definition at line 137 of file SeedTransformer.cc.

References PTrajectoryStateOnDet::detId(), TrajectorySeed::startingState(), and trajectoryStateTransform::transientState().

Referenced by StandAloneMuonTrajectoryBuilder::trajectories().

                                                                                                {

  PTrajectoryStateOnDet tmpTSOD = tmpSeed.startingState();
  DetId tmpDetId(tmpTSOD.detId());
  const GeomDet* tmpGeomDet = theTrackingGeometry->idToDet(tmpDetId);

  
  TrajectoryStateOnSurface tmpTSOS = trajectoryStateTransform::transientState(tmpTSOD, &(tmpGeomDet->surface()), &(*theMagneticField));

  return tmpTSOS;

}

void SeedTransformer::setServices

(

const edm::EventSetup &

iSetup

)

Set the services needed by the SeedTransformer.

Definition at line 67 of file SeedTransformer.cc.

References edm::EventSetup::get(), and CombinatorialSeedGeneratorForCosmicsRegionalReconstruction_cfi::thePropagatorName.

Referenced by DirectMuonTrajectoryBuilder::trajectories(), and StandAloneMuonTrajectoryBuilder::trajectories().

                                                          {

  iSetup.get<GlobalTrackingGeometryRecord>().get(theTrackingGeometry); 
  iSetup.get<IdealMagneticFieldRecord>().get(theMagneticField);
  iSetup.get<TrajectoryFitter::Record>().get(theFitterName,theFitter);
  iSetup.get<TransientRecHitRecord>().get(theMuonRecHitBuilderName,theMuonRecHitBuilder);
  iSetup.get<TrackingComponentsRecord>().get(thePropagatorName,thePropagator);

}

Member Data Documentation

double SeedTransformer::errorRescale

private

Error rescale factor.

Definition at line 62 of file SeedTransformer.h.

unsigned int SeedTransformer::nMinRecHits

private

Minimum number of RecHits required to perform the fit.

Definition at line 59 of file SeedTransformer.h.

edm::ESHandle<TrajectoryFitter> SeedTransformer::theFitter

private

Definition at line 50 of file SeedTransformer.h.

std::string SeedTransformer::theFitterName

private

Definition at line 54 of file SeedTransformer.h.

edm::ESHandle<MagneticField> SeedTransformer::theMagneticField

private

Definition at line 49 of file SeedTransformer.h.

edm::ESHandle<TransientTrackingRecHitBuilder> SeedTransformer::theMuonRecHitBuilder

private

Definition at line 51 of file SeedTransformer.h.

std::string SeedTransformer::theMuonRecHitBuilderName

private

Definition at line 55 of file SeedTransformer.h.

edm::ESHandle<Propagator> SeedTransformer::thePropagator

private

Definition at line 52 of file SeedTransformer.h.

std::string SeedTransformer::thePropagatorName

private

Definition at line 56 of file SeedTransformer.h.

edm::ESHandle<GlobalTrackingGeometry> SeedTransformer::theTrackingGeometry

private

Definition at line 48 of file SeedTransformer.h.

bool SeedTransformer::useSubRecHits

private

Definition at line 64 of file SeedTransformer.h.