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// $Id: G4MassWeightWindowProcess.hh,v 1.4 2003/11/26 14:51:48 gcosmo Exp $
// GEANT4 tag $Name: geant4-06-00-patch-01 $
//
// ----------------------------------------------------------------------
// Class G4MassWeioghtWindowProcess
//
// Class description:
//
// Used internally by weight window technique in the "mass" geometry.
// This process is a forced post step process. It will apply
// weight window biasing on boundaries, collisions 
// or both according to the G4PlaceOfAction argument.

// Author: Michael Dressel (Michael.Dressel@cern.ch)
// ----------------------------------------------------------------------
#ifndef G4MassWeioghtWindowProcess_hh
#define G4MassWeioghtWindowProcess_hh G4MassWeioghtWindowProcess_hh

#include "G4VProcess.hh"
#include "G4VTrackTerminator.hh"
#include "G4PlaceOfAction.hh"

class G4SamplingPostStepAction;
class G4VWeightWindowAlgorithm;
class G4VWeightWindowStore;

class G4MassWeightWindowProcess : public G4VProcess, public G4VTrackTerminator
{

public:  // with description

  G4MassWeightWindowProcess(const G4VWeightWindowAlgorithm &
                             aWeightWindowAlgorithm,
                             const G4VWeightWindowStore &aWWStore,
                             const G4VTrackTerminator *TrackTerminator,
                             G4PlaceOfAction placeOfAction,
                             const G4String &aName = 
                             "MassWeightWindowProcess");
    // creates a G4ParticleChange

  virtual ~G4MassWeightWindowProcess();
    // delete the G4ParticleChange

  virtual G4double 
  PostStepGetPhysicalInteractionLength(const G4Track& aTrack,
                                       G4double   previousStepSize,
                                       G4ForceCondition* condition);
    // make process beeing forced
  virtual G4VParticleChange *PostStepDoIt(const G4Track&, const G4Step&);
    // aply weight window sampling

  virtual void KillTrack() const;
    // used in case no scoring process follows that does the killing

  virtual const G4String &GetName() const;


public:  // without description

  //  no operation in  AtRestDoIt and  AlongStepDoIt

  virtual G4double 
  AlongStepGetPhysicalInteractionLength(const G4Track&,
                                        G4double  ,
                                        G4double  ,
                                        G4double& ,
                                        G4GPILSelection*);
  virtual G4double 
  AtRestGetPhysicalInteractionLength(const G4Track& ,
                                     G4ForceCondition*);
  
  virtual G4VParticleChange* 
  AtRestDoIt(const G4Track&, const G4Step&);


  virtual G4VParticleChange* 
  AlongStepDoIt(const G4Track&, const G4Step&);
  
private:
  
  G4MassWeightWindowProcess(const G4MassWeightWindowProcess &);
  G4MassWeightWindowProcess &operator=(const G4MassWeightWindowProcess &);
  
private:

  G4ParticleChange *fParticleChange;
  const G4VWeightWindowAlgorithm &fWeightWindowAlgorithm;
  const G4VWeightWindowStore &fWeightWindowStore;
  G4SamplingPostStepAction *fPostStepAction;
  G4PlaceOfAction fPlaceOfAction;

};

#endif