/data/refman/pasoursint/CMSSW_4_1_8_patch13/src/TrackingTools/TrackFitters/interface/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/PatternTools/interface/MeasurementEstimator.h"
#include "TrackingTools/PatternTools/interface/TrajectoryMeasurement.h"
#include "TrackingTools/DetLayers/interface/DetLayerGeometry.h"

class KFTrajectorySmoother : 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) :
    thePropagator(aPropagator.clone()),
    theUpdator(aUpdator.clone()),
    theEstimator(aEstimator.clone()),
    theErrorRescaling(errorRescaling),
    minHits_(minHits),
    theGeometry(0){ // to be fixed. Why this first constructor is needed? who is using it? Can it be removed?
      if(!theGeometry) theGeometry = &dummyGeometry;
    }


  KFTrajectorySmoother(const Propagator* aPropagator,
                       const TrajectoryStateUpdator* aUpdator, 
                       const MeasurementEstimator* aEstimator,
                       float errorRescaling = 100.f,
                       int minHits = 3,
                       const DetLayerGeometry* detLayerGeometry=0) :
    thePropagator(aPropagator->clone()),
    theUpdator(aUpdator->clone()),
    theEstimator(aEstimator->clone()),
    theErrorRescaling(errorRescaling),
    minHits_(minHits),
    theGeometry(detLayerGeometry){
      if(!theGeometry) theGeometry = &dummyGeometry;
    }

  virtual ~KFTrajectorySmoother();

  virtual std::vector<Trajectory> trajectories(const Trajectory& aTraj) const;

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

  virtual KFTrajectorySmoother* clone() const{
    return new KFTrajectorySmoother(thePropagator,theUpdator,theEstimator,theErrorRescaling,minHits_,theGeometry);
  }

private:
  const DetLayerGeometry dummyGeometry;
  Propagator* thePropagator;
  const TrajectoryStateUpdator* theUpdator;
  const MeasurementEstimator* theEstimator;
  float theErrorRescaling;
  int minHits_;
  const DetLayerGeometry* theGeometry;
};

#endif //CD_KFTrajectorySmoother_H_