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//--------------------------------------------------------------------------
// File and Version Information:
//
// Description:  TrkMomVisitor is an implementation of the Visitor pattern
//      for use in calculating momenta for different types of
//      trajectories.  (See the book _Design Patterns_ or one of the
//      authors for a definition of the Visitor pattern.) 
//
// Environment:
//      Software developed for the BaBar Detector at the SLAC B-Factory.
//
// Author(s): Justin Albert, Steve Schaffner
//
//------------------------------------------------------------------------
#ifndef TRKMOMVISITOR_H
#define TRKMOMVISITOR_H

#include "TrkBase/TrkVisitor.h"

class TrkSimpTraj;
class HelixTraj;
class TrkCircleTraj;
class NeutTraj;
class TrkDifLineTraj;

// Class interface //
class TrkMomVisitor : public TrkVisitor {

public:

  TrkMomVisitor(const TrkSimpTraj&);

  virtual ~TrkMomVisitor();

  // ******************
  // data member access
  // ******************

  const HelixTraj*      helix() const      {return _ht;}
  const TrkCircleTraj*  circle() const     {return _ct;}
  const NeutTraj*       neut() const       {return _nt;}   
  const TrkDifLineTraj* line() const       {return _lt;}

  //********************************
  // The visitor functions:
  //********************************

  virtual void trkVisitHelixTraj(const HelixTraj*);
  virtual void trkVisitCircleTraj(const TrkCircleTraj*);
  virtual void trkVisitNeutTraj(const NeutTraj*);
  virtual void trkVisitLineTraj(const TrkDifLineTraj*);

private:

  const HelixTraj*      _ht;
  const TrkCircleTraj*  _ct;
  const NeutTraj*       _nt;
  const TrkDifLineTraj* _lt;

};

#endif

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