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// $Id$
// GEANT4 tag $Name:  $
//
// Author: Maria Grazia Pia (Maria.Grazia.Pia@cern.ch)
//
// History:
// -----------
// 31 Jul 2001   MGP        Created
//
// -------------------------------------------------------------------

// Class description:
// Low Energy Electromagnetic Physics
// Data set for an electromagnetic physics process
// A strategy pattern is used to encapsulate algorithms for data interpolation
// Further documentation available from http://www.ge.infn.it/geant4/lowE

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

#ifndef G4RDEMDATASET_HH
#define G4RDEMDATASET_HH 1

#include <CLHEP/Units/SystemOfUnits.h>

#include "globals.hh"
#include "G4RDVEMDataSet.hh"

class G4RDVDataSetAlgorithm;

class G4RDEMDataSet : public G4RDVEMDataSet
{
public:
  G4RDEMDataSet(G4int argZ, 
	      G4RDVDataSetAlgorithm* algo, 
	      G4double xUnit=CLHEP::MeV, 
	      G4double yUnit=CLHEP::barn,
              G4bool random=false);

  G4RDEMDataSet(G4int argZ, 
	      G4DataVector* xData, 
	      G4DataVector* data, 
	      G4RDVDataSetAlgorithm* algo, 
	      G4double xUnit=CLHEP::MeV, 
	      G4double yUnit=CLHEP::barn,
	      G4bool random=false);

  virtual ~G4RDEMDataSet();
 
  virtual G4double FindValue(G4double x, G4int componentId=0) const;
  
  virtual void PrintData(void) const;

  virtual const G4RDVEMDataSet* GetComponent(G4int /* componentId */) const { return 0; }

  virtual void AddComponent(G4RDVEMDataSet* /* dataSet */) {}

  virtual size_t NumberOfComponents(void) const { return 0; }

  virtual const G4DataVector& GetEnergies(G4int /* componentId */) const { return *energies; }
  virtual const G4DataVector& GetData(G4int /* componentId */) const { return *data; }
  virtual void SetEnergiesData(G4DataVector* xData, G4DataVector* data, G4int componentId);

  virtual G4bool LoadData(const G4String& fileName);
  virtual G4bool SaveData(const G4String& fileName) const;

  virtual G4double RandomSelect(G4int componentId = 0) const;
    

private:

  size_t FindLowerBound(G4double energy) const;
  size_t FindLowerBound(G4double x, G4DataVector* values) const;

  G4double IntegrationFunction(G4double x);

  virtual void BuildPdf();
  
  G4String FullFileName(const G4String& fileName) const;

  // Hide copy constructor and assignment operator 
  G4RDEMDataSet();
  G4RDEMDataSet(const G4RDEMDataSet& copy);
  G4RDEMDataSet& operator=(const G4RDEMDataSet& right);

  G4int z;

  G4DataVector* energies;            // Owned pointer
  G4DataVector* data;                // Owned pointer

  G4RDVDataSetAlgorithm* algorithm;    // Owned pointer 
  
  G4double unitEnergies;
  G4double unitData;

  G4DataVector* pdf;
  G4bool randomSet;
};
#endif /* G4EMDATASET_HH */
