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//
//
// $Id$
//
// Author: Maria Grazia Pia (Maria.Grazia.Pia@cern.ch)
//
// History:
// -----------
// 31 Jul 2001   MGP        Created as G4EMDataSet
// 31 Jul 2008   MGP        Revised and renamed to G4DataSet
//
// -------------------------------------------------------------------

// Class description:
// Leaf data set 
// Applies a Composite design pattern for data library management

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

#ifndef  G4DATASET_HH
#define  G4DATASET_HH 1

#include <CLHEP/Units/SystemOfUnits.h>

#include "globals.hh"
#include "G4IDataSet.hh"

class G4IInterpolator;

class G4DataSet : public G4IDataSet
{
public:
  G4DataSet(G4int argZ, 
	    G4IInterpolator* algo, 
	    G4double xUnit=CLHEP::MeV, 
	    G4double yUnit=CLHEP::barn,
	    G4bool random=false);

  G4DataSet(G4int argZ, 
	    G4DataVector* xData, 
	    G4DataVector* data, 
	    G4IInterpolator* algo, 
	    G4double xUnit=CLHEP::MeV, 
	    G4double yUnit=CLHEP::barn,
	    G4bool random=false);

  virtual ~G4DataSet();
 
  virtual G4double FindValue(G4double x, G4int componentId=0) const;
  
  virtual void PrintData(void) const;

  virtual const G4IDataSet* GetComponent(G4int /* componentId */) const { return 0; }

  virtual void AddComponent(G4IDataSet* /* 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 
  G4DataSet();
  G4DataSet(const G4DataSet& copy);
  G4DataSet& operator=(const G4DataSet& right);

  G4int z;

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

  G4IInterpolator* algorithm;    // Owned pointer 
  
  G4double unitEnergies;
  G4double unitData;

  G4DataVector* pdf;
  G4bool randomSet;
};
#endif /* G4DATASET_HH */
