//
// ********************************************************************
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// *                                                                  *
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//
// $Id: G4VEvtBiasMechanism.hh,v 1.3.10.2 2001/06/28 20:20:15 gunter Exp $
// GEANT4 tag $Name:  $
//
// 
// ------------------------------------------------------------
//	GEANT 4 class header file 
//
//   
// -------------------------------------------------------
//  Class Description   
//   This class is a base class for all "event biasing mechanism". 
//  
// 
// ------------------------------------------------------------
//   Implemented for the new scheme            17 Nov. 1998  H.Kurahige
// 

#ifndef G4VEvtBiasMechanism_h
#define G4VEvtBiasMechanism_h 1

#include "globals.hh"
#include "G4ios.hh"

class G4Step;
class G4VParticleChange;
class G4ParticleDefinition;

class G4VEvtBiasMechanism
{
public: // with description

  // constructors
  G4VEvtBiasMechanism(const G4String& name = "");
  G4VEvtBiasMechanism(const G4VEvtBiasMechanism& right);

public: 
  //destructors
  virtual ~G4VEvtBiasMechanism();


public: // with description
  // pure virtual functions
  
  // ApplyMath method will be invoked in G4VParticleChange::UpdateStepInfo()
  // if G4VParticleChange::fUseEB is set
  virtual G4VParticleChange* ApplyMath( G4VParticleChange*, const G4Step& ) =0;
     
  // IsApplicable method returns 'true' if this Event Bias Mechanism is 
  // valid for the particle type
  virtual G4bool IsApplicable(G4ParticleDefinition*) const = 0;

  
  // name of the biasing mechanism
  const G4String& GetName(){ return theEBName;}

  // Set/Get Verbose level 
  G4int GetVerboseLevel() const { return verboseLevel; }
  void  SetVerboseLevel(G4int value) { verboseLevel = value; }

 private:
  G4String theEBName;

 private:
  G4int verboseLevel;
  
};

#endif