XrayFluoDataSet.cc

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//
// $Id: XrayFluoDAtaSet.cc
// GEANT4 tag $Name: xray_fluo-V03-02-00
//
// Author: Elena Guardincerri (Elena.Guardincerri@ge.infn.it)
//
// History:
// -----------
// 28 Nov 2001 Elena Guardincerri     Created
//
// -------------------------------------------------------------------

#include "XrayFluoDataSet.hh"
#include <fstream>
#include "G4VDataSetAlgorithm.hh"

XrayFluoDataSet::XrayFluoDataSet(G4int /*Z*/,
             G4DataVector* points, 
             G4DataVector* values,
             const G4VDataSetAlgorithm* interpolation,
             G4double unitE, G4double unitData)
  :energies(points), data(values), algorithm(interpolation)
{
  numberOfBins = energies->size();
  unit1 = unitE;
  unit2 = unitData;
}

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XrayFluoDataSet:: XrayFluoDataSet(G4int /*Z*/, 
              const G4String& dataFile,
              const G4VDataSetAlgorithm* interpolation,
              G4double unitE, G4double unitData)
  : algorithm(interpolation)
{
  energies = new G4DataVector;
  data = new G4DataVector;
  unit1 = unitE;
  unit2 = unitData;  
  LoadData(dataFile);
  numberOfBins = energies->size();
}

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// Destructor
XrayFluoDataSet::~XrayFluoDataSet()
{ 
  delete energies;
  delete data;
}

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G4double XrayFluoDataSet::FindValue(G4double e, G4int) const
{
  G4double value;
  G4double e0 = (*energies)[0];
  // Protections
  size_t bin = FindBinLocation(e);
  if (bin == numberOfBins)
    {
     
      value = (*data)[bin];
    }
  else if (e <= e0)
    {
    
      value = (*data)[0];
    }
  else
    {
      value = algorithm->Calculate(e,bin,*energies,*data);
    }
  
  return value;
}

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G4int XrayFluoDataSet::FindBinLocation(G4double energy) const
{
  // Protection against call outside allowed range
  G4double e0 = (*energies)[0];
  if (energy < e0)
    {
    
      energy = e0;
    }

  size_t lowerBound = 0;
  size_t upperBound = numberOfBins - 1;
  
  // Binary search
  while (lowerBound <= upperBound) 
    {
      size_t midBin = (lowerBound + upperBound)/2;
      if ( energy < (*energies)[midBin] ) upperBound = midBin-1;
      else lowerBound = midBin+1;
  }
 
  return upperBound;
}

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G4bool XrayFluoDataSet::LoadData(const G4String& fileName)
{
  // Build the complete string identifying the file with the data set
  G4String dirFile = "";
  
  char* path;

  path = getenv("XRAYDATA");
  if (!path)
    path = getenv("PWD");

  //G4cout << path << G4endl;
  //G4cout << fileName << G4endl;


  G4String pathString(path);
  pathString += "\0";
  dirFile = pathString + "/" + fileName + ".dat";
    
  std::ifstream file(dirFile);
  std::filebuf* lsdp = file.rdbuf();
  
  if (! (lsdp->is_open()) )
    {
      G4ExceptionDescription execp;
      execp << "XrayFluoDataSet - data file: " + dirFile + " not found"<<G4endl;
      G4Exception("XrayFluoDataSet::LoadData()","example-xray_fluorescence01",
      FatalException, execp);
    }
  G4double a = 0;
  G4int k = 1;

  do
    {
      file >> a;
      G4int nColumns = 2;
      // The file is organized into two columns:
      // 1st column is the energy
      // 2nd column is the corresponding value
      // The file terminates with the pattern: -1   -1
      //                                       -2   -2
      if (a == -1 || a == -2)
    {
     
    }
      else
    {
      if (k%nColumns != 0)
        {   
          G4double e = a * unit1;
          energies->push_back(e);
        
          k++;

        }
      else if (k%nColumns == 0)
        {
          G4double value = a * unit2;
          data->push_back(value);
         
          k = 1;
        }
    }
      
    } while (a != -2); // end of file
  
  file.close();
  return true;

}

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void XrayFluoDataSet::PrintData() const
{
  size_t size = numberOfBins;
  for (size_t i=0; i<size; i++)
    {
      G4double e = (*energies)[i]  / unit1;
      G4double sigma = (*data)[i] / unit2 ;
      G4cout << "Point: "
         << e
         << " - Data value : "
         << sigma 
         << G4endl; 
    }
}