/data/refman/pasoursint/CMSSW_5_3_3/src/RecoTracker/CkfPattern/src/TrajectorySegmentBuilder.h

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#ifndef TrajectorySegmentBuilder_H
#define TrajectorySegmentBuilder_H

//B.M. #include "CommonDet/DetUtilities/interface/DetExceptions.h"
#include "TrackingTools/TrajectoryState/interface/FreeTrajectoryState.h"
#include "TrackingTools/TrajectoryState/interface/TrajectoryStateOnSurface.h"
//B.M.#include "TrackingTools/GeomPropagators/interface/AnalyticalPropagator.h"
#include "TrackingTools/GeomPropagators/interface/Propagator.h"
#include "TrackingTools/TransientTrackingRecHit/interface/TransientTrackingRecHit.h"
#include "RecoTracker/MeasurementDet/interface/MeasurementTracker.h"
#include "TrackingTools/MeasurementDet/interface/LayerMeasurements.h"
#include <vector>                                        

#include "FWCore/Utilities/interface/Visibility.h"


class TrajectoryStateUpdator;
class MeasurementEstimator;
class Trajectory;
class TrajectoryMeasurement;
class TrajectoryMeasurementGroup;
class FreeTrajectoryState;
class TrajectoryStateOnSurface;
class DetGroup;
class DetLayer;
class TempTrajectory;

class  dso_internal TrajectorySegmentBuilder {

private:
  // short names
  typedef FreeTrajectoryState FTS;
  typedef TrajectoryStateOnSurface TSOS;
  typedef TrajectoryMeasurement TM;
  typedef TrajectoryMeasurementGroup TMG;
  typedef std::vector<Trajectory> TrajectoryContainer;
  typedef std::vector<TempTrajectory> TempTrajectoryContainer;
  typedef TransientTrackingRecHit::ConstRecHitContainer ConstRecHitContainer;
  typedef TransientTrackingRecHit::ConstRecHitPointer   ConstRecHitPointer;
  
public:
  
  TrajectorySegmentBuilder (const MeasurementTracker* theInputMeasurementTracker,
                            const LayerMeasurements*  theInputLayerMeasurements,
                            const DetLayer& layer,
                            const Propagator& propagator,
                            const TrajectoryStateUpdator& updator,
                            const MeasurementEstimator& estimator,
                            bool lockHits, bool bestHitOnly, int maxSegments ) :
    theMeasurementTracker(theInputMeasurementTracker),
    theLayerMeasurements(theInputLayerMeasurements),
    theLayer(layer),
    theFullPropagator(propagator),
    theUpdator(updator),
    theEstimator(estimator),
    theGeomPropagator(propagator),
//     theGeomPropagator(propagator.propagationDirection()),
    theLockHits(lockHits),theBestHitOnly(bestHitOnly),
    theMaxSegments(maxSegments)
  {}

  ~TrajectorySegmentBuilder() {}

  //std::vector<Trajectory> segments (const TSOS startingState);
  TempTrajectoryContainer segments (const TSOS startingState);

private:
  void updateTrajectory (TempTrajectory& traj, const TM& tm) const;
 
  void updateCandidates (TempTrajectory& traj, const std::vector<TM>& measurements,
                         TempTrajectoryContainer& candidates);

  void updateCandidatesWithBestHit (TempTrajectory& traj, const std::vector<TM>& measurements,
                                    TempTrajectoryContainer& candidates);

  std::vector<TrajectoryMeasurement> redoMeasurements (const TempTrajectory& traj,
                                                  const DetGroup& detGroup) const;

  std::vector<TrajectoryMeasurement> unlockedMeasurements (const std::vector<TM>& measurements) const;

  void lockMeasurement (const TM& measurement);

  //B.M to be ported later
  void cleanCandidates (std::vector<TempTrajectory>& candidates) const;

// public:

  std::vector<TempTrajectory> addGroup( TempTrajectory& traj,
                               std::vector<TrajectoryMeasurementGroup>::const_iterator begin,
                               std::vector<TrajectoryMeasurementGroup>::const_iterator end);
    
  void updateWithInvalidHit (TempTrajectory& traj,
                             const std::vector<TMG>& groups,
                             TempTrajectoryContainer& candidates) const;
  
private:
  const MeasurementTracker*     theMeasurementTracker;
  const LayerMeasurements*      theLayerMeasurements;
  const DetLayer&               theLayer;
  const Propagator&             theFullPropagator;
  const TrajectoryStateUpdator& theUpdator;
  const MeasurementEstimator&   theEstimator;
//   AnalyticalPropagator theGeomPropagator;
  const Propagator&             theGeomPropagator;

  bool theLockHits;
  bool theBestHitOnly;
  ConstRecHitContainer theLockedHits;

  int theMaxSegments;

  bool theDbgFlg;
};

#endif