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//
// $Id: G4VCrossSectionHandler.hh,v 1.11 2002/05/28 09:15:26 pia Exp $
// GEANT4 tag $Name: geant4-05-00 $
//
// Author: Maria Grazia Pia (Maria.Grazia.Pia@cern.ch)
//
// History:
// -----------
// 16 Sep 2001   MGP           Created
// 26 Sep 2001   V.Ivanchenko  Hide copy constructor and assignement operator
// 18 Apr 2002   V.Ivanchenko  Move member function ValueForMaterial to public
//
// -------------------------------------------------------------------

// Class description:
// Low Energy Electromagnetic Physics
// Base class for cross section manager for an electromagnetic physics process
// Further documentation available from http://www.ge.infn.it/geant4/lowE

// -------------------------------------------------------------------

#ifndef G4VCROSSSECTIONHANDLER_HH
#define G4VCROSSSECTIONHANDLER_HH 1

#include "globals.hh"
#include "G4DataVector.hh"
#include "g4std/map"
#include "g4std/vector"

class G4VDataSetAlgorithm;
class G4VEMDataSet;
class G4Material;
class G4Element;

class G4VCrossSectionHandler {
 
public:

  G4VCrossSectionHandler();

  G4VCrossSectionHandler(G4VDataSetAlgorithm* interpolation,
			 G4double minE = 250*eV, G4double maxE = 100*GeV, 
			 G4int nBins = 200,
			 G4double unitE = MeV, G4double unitData = barn,
			 G4int minZ = 1, G4int maxZ = 99);

  virtual ~G4VCrossSectionHandler();
	
  void Initialise(G4VDataSetAlgorithm* interpolation = 0,
		  G4double minE = 250*eV, G4double maxE = 100*GeV, 
		  G4int numberOfBins = 200,
		  G4double unitE = MeV, G4double unitData = barn,
		  G4int minZ = 1, G4int maxZ = 99);

  G4int SelectRandomAtom(const G4Material* material, G4double e) const;

  const G4Element* SelectRandomElement(const G4Material* material, 
				       G4double e) const;

  G4int SelectRandomShell(G4int Z, G4double e) const;

  G4VEMDataSet* BuildMeanFreePathForMaterials(const G4DataVector* energyCuts = 0);
 
  G4double FindValue(G4int Z, G4double e) const;

  G4double FindValue(G4int Z, G4double e, G4int shellIndex) const;

  G4double ValueForMaterial(const G4Material* material, G4double e) const;

  void LoadData(const G4String& dataFile);

  void LoadShellData(const G4String& dataFile);

  void PrintData() const;
  
  void Clear();

protected: 
   
  G4int NumberOfComponents(G4int Z) const;

  void ActiveElements();

  // Factory method
  virtual G4std::vector<G4VEMDataSet*>* BuildCrossSectionsForMaterials(const G4DataVector& energyVector, 
								       const G4DataVector* energyCuts = 0) = 0;

  // Factory method
  virtual G4VDataSetAlgorithm* CreateInterpolation(); 

  const G4VDataSetAlgorithm* GetInterpolation() const { return interpolation; }


private:

  // Hide copy constructor and assignment operator
  G4VCrossSectionHandler(const G4VCrossSectionHandler&);
  G4VCrossSectionHandler & operator=(const G4VCrossSectionHandler &right);

  G4VDataSetAlgorithm* interpolation;
  
  G4double eMin;
  G4double eMax;
  G4int nBins;

  G4double unit1;
  G4double unit2;

  G4int zMin;
  G4int zMax; 

  G4DataVector activeZ;

  G4std::map<G4int,G4VEMDataSet*,G4std::less<G4int> > dataMap;
  
  G4std::vector<G4VEMDataSet*>* crossSections;
};
 
#endif