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// $Id: G4ParallelImportanceProcess.hh,v 1.12 2006/06/29 21:10:12 gunter Exp $
// GEANT4 tag $Name: geant4-08-01 $
//
// ----------------------------------------------------------------------
// Class G4ParallelImportanceProcess
//
// Class description:
//
// Used internally by importance sampling in a "parallel" geometry.
// This is a G4ParallelTransport that also does importance
// sampling in the "parallel" geometry.

// Author: Michael Dressel (Michael.Dressel@cern.ch)
// ----------------------------------------------------------------------
#ifndef G4ParallelImportanceProcess_hh
#define G4ParallelImportanceProcess_hh G4ParallelImportanceProcess_hh

#include "G4ParallelTransport.hh"
#include "G4VTrackTerminator.hh"

class G4SamplingPostStepAction;
class G4VImportanceSplitExaminer;
class G4Nsplit_Weight;

class G4ParallelImportanceProcess : public G4ParallelTransport,
                                    public G4VTrackTerminator
{

public:  // with description

  G4ParallelImportanceProcess(const G4VImportanceSplitExaminer &aImportanceSplitExaminer,
                              G4VPGeoDriver &pgeodriver, 
                              G4VParallelStepper &aStepper,
                              const G4VTrackTerminator *TrackTerminator,
                              const G4String &aName = "ParallelImportanceProcess");  
    // initialise G4ParallelTransport and members

  virtual ~G4ParallelImportanceProcess();

  virtual G4VParticleChange *PostStepDoIt(const G4Track&,
                                          const G4Step&);
    // do the "parallel transport" and importance sampling.

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

  virtual const G4String &GetName() const;

private:

  G4ParallelImportanceProcess(const G4ParallelImportanceProcess &);
  G4ParallelImportanceProcess &operator=(const G4ParallelImportanceProcess &);
  
  virtual void Error(const G4String &m);

private:

  G4ParticleChange *fParticleChange;
  const G4VImportanceSplitExaminer &fImportanceSplitExaminer;  
  G4SamplingPostStepAction *fPostStepAction;
};

#endif