AnalyticalTrajectoryExtrapolatorToLine.h

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#ifndef AnalyticalTrajectoryExtrapolatorToLine_h_
#define AnalyticalTrajectoryExtrapolatorToLine_h_

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

class FreeTrajectoryState;
class TrajectoryStateOnSurface;
class Line;
class IterativeHelixExtrapolatorToLine;
class MagneticField;

class AnalyticalTrajectoryExtrapolatorToLine {

public:
  AnalyticalTrajectoryExtrapolatorToLine (const MagneticField* field);

  AnalyticalTrajectoryExtrapolatorToLine (const Propagator&);

  TrajectoryStateOnSurface extrapolate (const FreeTrajectoryState& fts,
                    const Line & L) const;

  TrajectoryStateOnSurface extrapolate (const TrajectoryStateOnSurface tsos,
                    const Line & L) const;

private:
  TrajectoryStateOnSurface extrapolateFullState (const TrajectoryStateOnSurface tsos, 
                         const Line& line) const;
  TrajectoryStateOnSurface extrapolateSingleState (const FreeTrajectoryState& fts, 
                           const Line& line) const;
  bool propagateWithHelix (const IterativeHelixExtrapolatorToLine& extrapolator, 
               const Line& line,
               GlobalPoint& x, GlobalVector& p, double& s) const;

private:
  DeepCopyPointerByClone<Propagator> thePropagator;
};

#endif