/data/refman/pasoursint/CMSSW_6_1_2_SLHC4_patch1/src/TrackingTools/TransientTrack/src/GsfTransientTrack.cc

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#include "TrackingTools/TransientTrack/interface/GsfTransientTrack.h"
#include "Geometry/Records/interface/GlobalTrackingGeometryRecord.h"
#include "TrackingTools/GeomPropagators/interface/AnalyticalPropagator.h"
#include "TrackingTools/GsfTools/interface/GsfPropagatorAdapter.h"
#include "TrackingTools/GsfTools/interface/MultiTrajectoryStateTransform.h"
#include "TrackingTools/TrajectoryState/interface/TrajectoryStateTransform.h"
#include "TrackingTools/PatternTools/interface/TSCBLBuilderNoMaterial.h"
#include <iostream>

using namespace reco;
using namespace std;



GsfTransientTrack::GsfTransientTrack() : 
  GsfTrack(), tkr_(), theField(0), initialTSOSAvailable(false),
  initialTSCPAvailable(false), blStateAvailable(false), theTIPExtrapolator()
{}

GsfTransientTrack::GsfTransientTrack( const GsfTrack & tk , const MagneticField* field) : 
  GsfTrack(tk),
  tkr_(), theField(field), initialTSOSAvailable(false),
  initialTSCPAvailable(false), blStateAvailable(false)
{
  
  initialFTS = trajectoryStateTransform::initialFreeState(tk, field);
}


GsfTransientTrack::GsfTransientTrack( const GsfTrackRef & tk , const MagneticField* field) : 
  GsfTrack(*tk), 
  tkr_(tk), theField(field), initialTSOSAvailable(false),
  initialTSCPAvailable(false), blStateAvailable(false),
  theTIPExtrapolator(AnalyticalPropagator(field, alongMomentum))
{
  
  initialFTS = trajectoryStateTransform::initialFreeState(*tk, field);
}

GsfTransientTrack::GsfTransientTrack( const GsfTrack & tk , const MagneticField* field,
                                      const edm::ESHandle<GlobalTrackingGeometry>& tg) :
  GsfTrack(tk),
   tkr_(), theField(field), initialTSOSAvailable(false),
  initialTSCPAvailable(false), blStateAvailable(false), theTrackingGeometry(tg),
  theTIPExtrapolator(AnalyticalPropagator(field, alongMomentum))
{
  
  initialFTS = trajectoryStateTransform::initialFreeState(tk, field);
}

GsfTransientTrack::GsfTransientTrack( const GsfTrackRef & tk , const MagneticField* field, 
                                      const edm::ESHandle<GlobalTrackingGeometry>& tg) :
  GsfTrack(*tk),
   tkr_(tk), theField(field), initialTSOSAvailable(false),
  initialTSCPAvailable(false), blStateAvailable(false), theTrackingGeometry(tg),
  theTIPExtrapolator(AnalyticalPropagator(field, alongMomentum))
{
  
  initialFTS = trajectoryStateTransform::initialFreeState(*tk, field);
}


GsfTransientTrack::GsfTransientTrack( const GsfTransientTrack & tt ) :
  GsfTrack(tt),
  tkr_(tt.persistentTrackRef()), theField(tt.field()), 
  initialFTS(tt.initialFreeState()), initialTSOSAvailable(false),
  initialTSCPAvailable(false),
  theTIPExtrapolator(AnalyticalPropagator(tt.field(), alongMomentum))
{
  if (tt.initialTSOSAvailable) {
    initialTSOS= tt.impactPointState();
    initialTSOSAvailable = true;
  }
  if (tt.initialTSCPAvailable) {
    initialTSCP= tt.impactPointTSCP();
    initialTSCPAvailable = true;
  }
}



void GsfTransientTrack::setES(const edm::EventSetup& setup) {

  setup.get<GlobalTrackingGeometryRecord>().get(theTrackingGeometry); 

}

void GsfTransientTrack::setTrackingGeometry(const edm::ESHandle<GlobalTrackingGeometry>& tg) {

  theTrackingGeometry = tg;

}

void GsfTransientTrack::setBeamSpot(const BeamSpot& beamSpot)
{
  theBeamSpot = beamSpot;
  blStateAvailable = false;
}


TrajectoryStateOnSurface GsfTransientTrack::impactPointState() const
{
  if (!initialTSOSAvailable) calculateTSOSAtVertex();
  return initialTSOS;
}

TrajectoryStateClosestToPoint GsfTransientTrack::impactPointTSCP() const
{
  if (!initialTSCPAvailable) {
    initialTSCP = builder(initialFTS, initialFTS.position());
    initialTSCPAvailable = true;
  }
  return initialTSCP;
}

TrajectoryStateOnSurface GsfTransientTrack::outermostMeasurementState() const
{
    MultiTrajectoryStateTransform theMTransform;
    return theMTransform.outerStateOnSurface((*this),*theTrackingGeometry,theField);
}

TrajectoryStateOnSurface GsfTransientTrack::innermostMeasurementState() const
{
    MultiTrajectoryStateTransform theMTransform;   
    return theMTransform.innerStateOnSurface((*this),*theTrackingGeometry,theField);
}

void GsfTransientTrack::calculateTSOSAtVertex() const
{
  TransverseImpactPointExtrapolator tipe(theField);
  initialTSOS = tipe.extrapolate(initialFTS, initialFTS.position());
  initialTSOSAvailable = true;
}

TrajectoryStateOnSurface 
GsfTransientTrack::stateOnSurface(const GlobalPoint & point) const
{
  return theTIPExtrapolator.extrapolate(innermostMeasurementState(), point);
}


TrajectoryStateClosestToPoint 
GsfTransientTrack::trajectoryStateClosestToPoint( const GlobalPoint & point ) const
{
  return builder(stateOnSurface(point), point);
}

TrajectoryStateClosestToBeamLine GsfTransientTrack::stateAtBeamLine() const
{
  if (!blStateAvailable) {
    TSCBLBuilderNoMaterial blsBuilder;
    trajectoryStateClosestToBeamLine = blsBuilder(initialFTS, theBeamSpot);
    blStateAvailable = true;
  }
  return trajectoryStateClosestToBeamLine;
}