/data/refman/pasoursint/CMSSW_6_1_1/src/TrackingTools/PatternTools/interface/TransverseImpactPointExtrapolator.h

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#ifndef TransverseImpactPointExtrapolator_h_
#define TransverseImpactPointExtrapolator_h_

#include "TrackingTools/GeomPropagators/interface/Propagator.h"
#include "DataFormats/GeometryVector/interface/GlobalPoint.h"
#include "DataFormats/GeometryVector/interface/GlobalVector.h"
#include "DataFormats/GeometryCommonDetAlgo/interface/DeepCopyPointerByClone.h"
#include "MagneticField/Engine/interface/MagneticField.h"

class FreeTrajectoryState;
class TrajectoryStateOnSurface;
// class Propagator;
class BoundPlane;
template <class T> class ReferenceCountingPointer;

class TransverseImpactPointExtrapolator {

public:

  TransverseImpactPointExtrapolator();
  
  TransverseImpactPointExtrapolator(const MagneticField* field);
  TransverseImpactPointExtrapolator(const Propagator& u);

  TrajectoryStateOnSurface extrapolate(const FreeTrajectoryState& fts,
                                       const GlobalPoint& vtx) const;
  TrajectoryStateOnSurface extrapolate(const TrajectoryStateOnSurface tsos,
                                       const GlobalPoint& vtx) const;
  
  TrajectoryStateOnSurface extrapolate(const FreeTrajectoryState& fts,
                                       const GlobalPoint& vtx,
                                       const Propagator& u) const;
  TrajectoryStateOnSurface extrapolate(const TrajectoryStateOnSurface tsos,
                                       const GlobalPoint& vtx,
                                       const Propagator& u) const;

private:
  TrajectoryStateOnSurface doExtrapolation (const TrajectoryStateOnSurface tsos, 
                                            const GlobalPoint& vtx, 
                                            const Propagator& u) const;
  TrajectoryStateOnSurface doExtrapolation (const FreeTrajectoryState& fts, 
                                            const GlobalPoint& vtx, 
                                            const Propagator& u) const;
  ReferenceCountingPointer<BoundPlane> tipSurface (const GlobalPoint& position,
                                                   const GlobalVector& momentum,
                                                   const double& signedTransverseRadius,
                                                   const GlobalPoint& vtx) const;

private:
  DeepCopyPointerByClone<Propagator> thePropagator;
};

#endif