//
// ********************************************************************
// * 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:                      *
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// * regarding  this  software system or assume any liability for its *
// * use.                                                             *
// *                                                                  *
// * This  code  implementation is the  intellectual property  of the *
// * GEANT4 collaboration.                                            *
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//
//
// Author:  Vladimir Ivanchenko (Vladimir.Ivantchenko@cern.ch)
//
// History:
// -----------
// 29 May 2002   VI        Created
//
// -------------------------------------------------------------------

#include "G4LinLogLogInterpolation.hh"

// Constructor

G4LinLogLogInterpolation::G4LinLogLogInterpolation()
{ }

// Destructor

G4LinLogLogInterpolation::~G4LinLogLogInterpolation()
{ }

G4VDataSetAlgorithm* G4LinLogLogInterpolation::Clone() const 
{ return new G4LinLogLogInterpolation; }


G4double G4LinLogLogInterpolation::Calculate(G4double x, G4int bin, 
					  const G4DataVector& points, 
					  const G4DataVector& data) const
{
  G4int nBins = data.size() - 1;
  G4double value = 0.;
  if (x < points[0])
    {
      value = 0.;
    }
  else if (bin < nBins)
    {
      G4double e1 = points[bin];
      G4double e2 = points[bin+1];
      G4double d1 = data[bin];
      G4double d2 = data[bin+1];
      if(d1 > 0.0 && d2 > 0.0) {
        value = (log10(d1)*log10(e2/x) + log10(d2)*log10(x/e1)) / log10(e2/e1);
        value = pow(10.,value);
      } else {
        value = (d1*log10(e2/x) + d2*log10(x/e1)) / log10(e2/e1);
      }
    }
  else
    {
      value = data[nBins];
    }

  return value;
}