//
// ********************************************************************
// * DISCLAIMER                                                       *
// *                                                                  *
// * The following disclaimer summarizes all the specific disclaimers *
// * of contributors to this software. The specific disclaimers,which *
// * govern, are listed with their locations in:                      *
// *   http://cern.ch/geant4/license                                  *
// *                                                                  *
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// * institutes,nor the agencies providing financial support for this *
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// * regarding  this  software system or assume any liability for its *
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// * This  code  implementation is the  intellectual property  of the *
// * GEANT4 collaboration.                                            *
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//
//// $Id: G4Gamma.hh,v 1.11 2001/12/13 12:04:11 gunter Exp $
// GEANT4 tag $Name: geant4-04-01 $
//
// 
// ------------------------------------------------------------
//      GEANT 4 class header file
//
//      History: first implementation, based on object model of
//      4-th April 1996, G.Cosmo
// ****************************************************************
//  Added particle definitions, H.Kurashige, 19 April 1996
//  Revised, G.Cosmo, 6 June 1996
//  Added SetCuts, L.Urban, 12 June 1996
//  Added not static GetEnergyCuts() and GetLengthCuts(), G.Cosmo, 11 July 1996
// ----------------------------------------------------------------

// Each class inheriting from G4VBoson
// corresponds to a particle type; one and only one
// instance for each class is guaranteed.

#ifndef G4Gamma_h
#define G4Gamma_h 1

#include "globals.hh"
#include "G4ios.hh"
#include "G4VBoson.hh"

// ######################################################################
// ###                           GAMMA                                ###
// ######################################################################

class G4Gamma : public G4VBoson
{
 private:
   static G4Gamma theGamma;
   
   //-------- the followings are used privately in G4Gamma ----
 private:
    typedef G4LossTable G4CrossSectionTable;
    void BuildAbsorptionLengthVector(
                              const G4Material* aMaterial,
			      const G4CrossSectionTable* aCrossSectionTable,
			      G4double       maxEnergy,     
			      G4double       aMass,
                              G4RangeVector* absorptionLengthVector 
			     );
    G4double ComputeCrossSection(
                              G4double AtomicNumber,
                              G4double KineticEnergy
                             ) const;

 //--------------for SetCuts----------------------------------------------
 protected:    
  G4double ComputeLoss(G4double AtomicNumber,G4double KineticEnergy) const;

  void BuildRangeVector(
			const G4Material* aMaterial,
			const G4LossTable* aLossTable,
			G4double       maxEnergy,     
			G4double       aMass,
			G4RangeVector* rangeVector);

  G4double ConvertCutToKineticEnergy(
				     G4RangeVector* absorptionLengthVector,
				     size_t materialIndex
                                ) const;

 private: // hide conxtructor as private
   G4Gamma(
       const G4String&     aName,        G4double            mass,
       G4double            width,        G4double            charge,   
       G4int               iSpin,        G4int               iParity,    
       G4int               iConjugation, G4int               iIsospin,   
       G4int               iIsospin3,    G4int               gParity,
       const G4String&     pType,        G4int               lepton,      
       G4int               baryon,       G4int               encoding,
       G4bool              stable,       G4double            lifetime,
       G4DecayTable        *decaytable
   );

 public:
   virtual ~G4Gamma(){}

   static G4Gamma* GammaDefinition();
   static G4Gamma* Gamma();
};

inline 
 G4double G4Gamma::ComputeLoss(G4double AtomicNumber,G4double KineticEnergy) const
{
  return ComputeCrossSection(AtomicNumber,KineticEnergy);
}

inline 
 void G4Gamma::BuildRangeVector(
				const G4Material* aMaterial,
				const G4LossTable* aLossTable,
				G4double       maxEnergy,     
				G4double       aMass,
				G4RangeVector* rangeVector)
{
  BuildAbsorptionLengthVector(aMaterial,
			      (const G4CrossSectionTable*)aLossTable,
			      maxEnergy, aMass, rangeVector);
}


#endif