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// $Id: G4CrossSectionPairGG.hh,v 1.3 2010/11/18 11:01:01 gunter Exp $
// $ GEANT4 tag $Name: geant4-09-04-ref-00 $
//
//   Class G4CrossSectionPairGG
//
//     Extend a cross section to higher energies using
//       G4GlauberGribovCrossSection at high energies.
//       Smoothly join cross section sets by scaling GG at a given 
//       transition energy to match the given low energy cross section.
//
//  Author:  Gunter Folger
//           November 2010
//
#ifndef G4CrossSectionPairGG_h
#define G4CrossSectionPairGG_h

#include "globals.hh"
#include "G4VCrossSectionDataSet.hh"
#include "G4ParticleDefinition.hh"
#include "G4GlauberGribovCrossSection.hh"
#include <valarray>

class G4CrossSectionPairGG : public G4VCrossSectionDataSet
{
  private:
   G4CrossSectionPairGG();
   G4CrossSectionPairGG(const G4CrossSectionPairGG&);
   G4CrossSectionPairGG& operator=(const G4CrossSectionPairGG&);

  public:
  
  G4CrossSectionPairGG(G4VCrossSectionDataSet * low,
//  	             G4VCrossSectionDataSet * high,
		     G4double Etransit);
			      
  virtual ~G4CrossSectionPairGG();

  G4bool IsApplicable(const G4DynamicParticle* particle, const G4Element* element)
  { return IsIsoApplicable(particle, G4lrint(element->GetZ()), G4lrint(element->GetN())); }  

  G4bool IsIsoApplicable(const G4DynamicParticle*, G4int Z, G4int N);

  G4double GetCrossSection(const G4DynamicParticle* particle, 
                           const G4Element* element,
                           G4double temperature)
         { return GetZandACrossSection(particle, G4lrint(element->GetZ()), 
                                G4lrint(element->GetN()), temperature);    }

  G4double GetZandACrossSection(const G4DynamicParticle*, G4int Z,
				G4int A, G4double aTemperature = 0.);


  void BuildPhysicsTable(const G4ParticleDefinition&);
  void DumpPhysicsTable(const G4ParticleDefinition&);
  
  private:
    G4VCrossSectionDataSet * theLowX;   
//    G4VCrossSectionDataSet * theHighX;
    G4GlauberGribovCrossSection * theHighX;
    G4double ETransition;
    typedef std::valarray<G4double> XS_factors;
    typedef std::pair<G4ParticleDefinition *, XS_factors > ParticleXScale;
    std::vector<ParticleXScale> scale_factors;

};

#endif