/data/refman/pasoursint/CMSSW_5_3_0/src/Alignment/ReferenceTrajectories/plugins/BzeroReferenceTrajectoryFactory.cc

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#include "Alignment/ReferenceTrajectories/interface/BzeroReferenceTrajectory.h" 
#include "Alignment/ReferenceTrajectories/interface/TrajectoryFactoryPlugin.h"

#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/TrajectoryFactoryBase.h"



class BzeroReferenceTrajectoryFactory : public TrajectoryFactoryBase
{
public:

  BzeroReferenceTrajectoryFactory(const edm::ParameterSet &config);
  virtual ~BzeroReferenceTrajectoryFactory();

  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 BzeroReferenceTrajectoryFactory* clone() const { return new BzeroReferenceTrajectoryFactory( *this ); }

private:

  double theMass;
  double theMomentumEstimate;
};



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


BzeroReferenceTrajectoryFactory::~BzeroReferenceTrajectoryFactory( void ) {}


const BzeroReferenceTrajectoryFactory::ReferenceTrajectoryCollection
BzeroReferenceTrajectoryFactory::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() )
  { 
    TrajectoryInput input = this->innermostStateAndRecHits( *itTracks );
    // Check input: If all hits were rejected, the TSOS is initialized as invalid.
    if ( input.first.isValid() )
    {
      // set the flag for reversing the RecHits to false, since they are already in the correct order.
      trajectories.push_back(ReferenceTrajectoryPtr(new BzeroReferenceTrajectory(input.first, input.second, false,
                                                                                 magneticField.product(),
                                                                                 materialEffects(),
                                                                                 propagationDirection(),
                                                                                 theMass, theMomentumEstimate,
                                                                                 theUseBeamSpot, beamSpot)));
    }

    ++itTracks;
  }

  return trajectories;
}


const BzeroReferenceTrajectoryFactory::ReferenceTrajectoryCollection
BzeroReferenceTrajectoryFactory::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=BzeroReferenceTrajectoryFactory::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() )
  {
    TrajectoryInput input = innermostStateAndRecHits( *itTracks );
    // Check input: If all hits were rejected, the TSOS is initialized as invalid.
    if ( input.first.isValid() )
    {
      if ( (*itExternal).isValid() && sameSurface( (*itExternal).surface(), input.first.surface() ) )
      {
        // set the flag for reversing the RecHits to false, since they are already in the correct order.
        ReferenceTrajectoryPtr refTraj( new BzeroReferenceTrajectory( *itExternal, input.second, false,
                                                                      magneticField.product(), materialEffects(),
                                                                      propagationDirection(), theMass,
                                                                      theMomentumEstimate, 
                                                                      theUseBeamSpot, beamSpot ) );

        AlgebraicSymMatrix externalParamErrors( asHepMatrix<5>( (*itExternal).localError().matrix() ) );
        refTraj->setParameterErrors( externalParamErrors.sub( 2, 5 ) );

        trajectories.push_back( refTraj );
      }
      else
      {
        trajectories.push_back(ReferenceTrajectoryPtr(new BzeroReferenceTrajectory(input.first, input.second, false,
                                                                                   magneticField.product(),
                                                                                   materialEffects(),
                                                                                   propagationDirection(),
                                                                                   theMass, theMomentumEstimate,
                                                                                   theUseBeamSpot, beamSpot)));
      }
    }

    ++itTracks;
    ++itExternal;
  }

  return trajectories;
}



DEFINE_EDM_PLUGIN( TrajectoryFactoryPlugin, BzeroReferenceTrajectoryFactory, "BzeroReferenceTrajectoryFactory" );