//
// ********************************************************************
// * DISCLAIMER                                                       *
// *                                                                  *
// * The following disclaimer summarizes all the specific disclaimers *
// * of contributors to this software. The specific disclaimers,which *
// * govern, are listed with their locations in:                      *
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// * work  make  any representation or  warranty, express or implied, *
// * regarding  this  software system or assume any liability for its *
// * use.                                                             *
// *                                                                  *
// * This  code  implementation is the  intellectual property  of the *
// * GEANT4 collaboration.                                            *
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//
//
// $Id: G4TransportationManager.hh,v 1.2 2003/11/03 17:15:21 gcosmo Exp $
// GEANT4 tag $Name: geant4-07-00-cand-01 $
//
// class G4TransportationManager
//
// Class description:
//
// A singleton class which stores the (volume) navigator used by 
// the transportation process to do the geometrical tracking.
// It also stores a pointer to the propagator used in a (magnetic) 
// field and to the field manager.
// The class instance is created before main() is called, and
// in turn creates the navigator and the rest.

// Created:  10 March 1997, J. Apostolakis
// --------------------------------------------------------------------

#ifndef  G4TransportationManager_hh
#define  G4TransportationManager_hh

#include "G4Navigator.hh"

class G4PropagatorInField;
class G4GeometryMessenger;
class G4FieldManager;

class G4TransportationManager 
{
  public:  // with description

     static G4TransportationManager* GetTransportationManager();

     inline G4Navigator*          GetNavigatorForTracking() const;
     inline G4PropagatorInField*  GetPropagatorInField() const;
     inline G4FieldManager*       GetFieldManager() const;

     inline void SetNavigatorForTracking( G4Navigator* newNavigator );
     inline void SetPropagatorInField( G4PropagatorInField* newFieldPropagator );
     void SetFieldManager( G4FieldManager* newFieldManager );

     ~G4TransportationManager(); 

  protected:

     G4TransportationManager(); 
    
  private:

     G4Navigator*            fNavigatorForTracking ;
     G4PropagatorInField*    fPropagatorInField;
     G4FieldManager*         fFieldManager;
     G4GeometryMessenger*    fGeomMessenger;

     static G4TransportationManager*  fTransportationManager;
};

#include "G4TransportationManager.icc"

#endif