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// ********************************************************************
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//
// $Id: G4ParallelImportanceSampler.hh,v 1.1 2002/05/31 10:16:01 dressel Exp $
// GEANT4 tag $Name: geant4-04-01 $
//
// ----------------------------------------------------------------------
// Class G4ParallelImportanceSampler
//
// Class description:
//
// A user should use this class to set up importance sampling
// in a "parallel" geometry.
// The user must create an object of this kind and initialise it.


// Author: Michael Dressel (Michael.Dressel@cern.ch)
// ----------------------------------------------------------------------
#ifndef G4ParallelImportanceSampler_hh
#define G4ParallelImportanceSampler_hh G4ParallelImportanceSampler_hh 

#include "globals.hh"
#include "G4VSampler.hh"

class G4ParallelWorld;
class G4VIStore;
class G4VImportanceAlgorithm;
class G4VImportanceSplitExaminer;
class G4ParallelImportanceProcess;

class G4ParallelImportanceSampler : public G4VSampler
{

public:  // with description

  G4ParallelImportanceSampler(G4VIStore &is, 
			      const G4String &particlename,
			      const G4VImportanceAlgorithm *ialg = 0);
    // if *ialg = 0: use the G4ImportanceAlgorithm 
    // use a customised  importance algorithm derived from
    // G4VImportanceAlgorithm  
    // create G4ParallelWorld and G4ImportanceSplitExaminer

public: // used internally by importance sampling 

  G4ParallelImportanceSampler(G4VIStore &is, 
			      const G4String &particlename,
			      G4ParallelWorld &pworld,
			      const G4VImportanceAlgorithm *ialg = 0);
  
  ~G4ParallelImportanceSampler();
    // delete G4ParallelWorld and G4ImportanceSplitExaminer
    // and G4ImportanceAgorithm and G4ParallelImportanceProcess
    // if created

public:  // with description

  G4ParallelImportanceProcess *CreateParallelImportanceProcess();
    // create the parallel importance process 
    // don't use it if you use Initialize()

   void Initialize();
    // the G4ParallelImportanceSampler has to be initialised after
    // the initialisation of the G4RunManager !
  
private:

  G4ParallelImportanceSampler(const G4ParallelImportanceSampler &);
  G4ParallelImportanceSampler &operator=(const G4ParallelImportanceSampler &);

private:

  G4String fParticleName;
  G4ParallelWorld &fParallelWorld;
  G4bool fCreatedPW;

  G4bool fDeleteAlg;
  const G4VImportanceAlgorithm *fIalgorithm;

  G4VImportanceSplitExaminer *fExaminer;
  G4ParallelImportanceProcess *fParallelImportanceProcess;
};

#endif