KFTrajectorySmoother.h

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#ifndef CD_KFTrajectorySmoother_H_
#define CD_KFTrajectorySmoother_H_

#include "TrackingTools/PatternTools/interface/TrajectorySmoother.h"
#include "TrackingTools/PatternTools/interface/TrajectoryStateUpdator.h"
#include "TrackingTools/GeomPropagators/interface/Propagator.h"
#include "TrackingTools/TrajectoryState/interface/TrajectoryStateOnSurface.h"
#include "TrackingTools/TrajectoryState/interface/FreeTrajectoryState.h"
#include "TrackingTools/DetLayers/interface/MeasurementEstimator.h"
#include "TrackingTools/PatternTools/interface/TrajectoryMeasurement.h"
#include "TrackingTools/DetLayers/interface/DetLayerGeometry.h"

class KFTrajectorySmoother final : public TrajectorySmoother {

private:

  typedef TrajectoryStateOnSurface TSOS;
  typedef FreeTrajectoryState FTS;
  typedef TrajectoryMeasurement TM;

public:

  KFTrajectorySmoother(const Propagator& aPropagator,
                       const TrajectoryStateUpdator& aUpdator,
                       const MeasurementEstimator& aEstimator,
               float errorRescaling = 100.f,
               int minHits = 3) :
  theAlongPropagator(nullptr),
    theOppositePropagator(nullptr),
    theUpdator(aUpdator.clone()),
    theEstimator(aEstimator.clone()),
    theErrorRescaling(errorRescaling),
    minHits_(minHits),
    theGeometry(nullptr){ // to be fixed. Why this first constructor is needed? who is using it? Can it be removed?
      if(!theGeometry) theGeometry = &dummyGeometry;
      auto p = aPropagator.clone();
      p->setPropagationDirection(alongMomentum);
      theAlongPropagator = p;
      p = aPropagator.clone();
      p->setPropagationDirection(oppositeToMomentum);
      theOppositePropagator = p;
    }


  KFTrajectorySmoother(const Propagator* aPropagator,
               const TrajectoryStateUpdator* aUpdator, 
               const MeasurementEstimator* aEstimator,
               float errorRescaling = 100.f,
               int minHits = 3,
               const DetLayerGeometry* detLayerGeometry=nullptr,
                       TkCloner const * hc=nullptr) :
    theAlongPropagator(nullptr),
    theOppositePropagator(nullptr),
    theUpdator(aUpdator->clone()),
    theEstimator(aEstimator->clone()),
    theHitCloner(hc),
    theErrorRescaling(errorRescaling),
    minHits_(minHits),
    theGeometry(detLayerGeometry){
      if(!theGeometry) theGeometry = &dummyGeometry;
      auto p = aPropagator->clone();
      p->setPropagationDirection(alongMomentum);
      theAlongPropagator = p;
      p = aPropagator->clone();
      p->setPropagationDirection(oppositeToMomentum);
      theOppositePropagator = p;
    }

  ~KFTrajectorySmoother() override;

  Trajectory trajectory(const Trajectory& aTraj) const override;

  const Propagator* alongPropagator() const { return theAlongPropagator;}
  const Propagator* oppositePropagator() const {return theOppositePropagator;}

  const TrajectoryStateUpdator* updator() const {return theUpdator;}
  const MeasurementEstimator* estimator() const {return theEstimator;}

  KFTrajectorySmoother* clone() const override{
    return new KFTrajectorySmoother(theAlongPropagator,theUpdator,theEstimator,theErrorRescaling,minHits_,theGeometry,theHitCloner);
  }

 // FIXME a prototype:  final inplementaiton may differ
  void setHitCloner(TkCloner const * hc) override {  theHitCloner = hc;}


private:
  const DetLayerGeometry dummyGeometry;
  const Propagator* theAlongPropagator;
  const Propagator* theOppositePropagator;
  const TrajectoryStateUpdator* theUpdator;
  const MeasurementEstimator* theEstimator;
  TkCloner const * theHitCloner=nullptr;
  float theErrorRescaling;
  int minHits_;
  const DetLayerGeometry* theGeometry;
};

#endif //CD_KFTrajectorySmoother_H_