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//
// $Id: G4ShellEMDataSet.cc,v 1.18 2009/09/25 07:41:34 sincerti Exp $
// GEANT4 tag $Name: geant4-09-04-beta-cand-01 $
//
// Author: Maria Grazia Pia (Maria.Grazia.Pia@cern.ch)
//
// History:
// -----------
//  1 Aug 2001   MGP         Created
//
//  09.10.01   V.Ivanchenko  Add case z=0
//
//  9 Mar 2008   MGP         Cleaned up unreadable code modified by former developer
//                           (Further clean-up needed)
//
//  15 Jul 2009   Nicolas A. Karakatsanis
//
//                           - LoadNonLogData method was created to load only the non-logarithmic data from G4EMLOW
//                             dataset. It is essentially performing the data loading operations as in the past.
//
//                           - LoadData method was revised in order to calculate the logarithmic values of the data
//                             It retrieves the data values from the G4EMLOW data files but, then, calculates the
//                             respective log values and loads them to seperate data structures. 
//
//                           - SetLogEnergiesData method was cretaed to set logarithmic values to G4 data vectors.
//                             The EM data sets, initialized this way, contain both non-log and log values.
//                             These initialized data sets can enhance the computing performance of data interpolation
//                             operations
// 
//
// -------------------------------------------------------------------

#include "G4ShellEMDataSet.hh"
#include "G4EMDataSet.hh"
#include "G4VDataSetAlgorithm.hh"
#include <fstream>
#include <sstream>


G4ShellEMDataSet::G4ShellEMDataSet(G4int zeta, G4VDataSetAlgorithm* algo, 
				   G4double eUnit, 
				   G4double dataUnit)
  :
  z(zeta),
  algorithm(algo),
  unitEnergies(eUnit),
  unitData(dataUnit)
{
  if (algorithm == 0) G4Exception("G4ShellEMDataSet::G4ShellEMDataSet - interpolation == 0");
}


G4ShellEMDataSet::~G4ShellEMDataSet()
{
  CleanUpComponents();
  if (algorithm) delete algorithm;
}


G4double G4ShellEMDataSet::FindValue(G4double energy, G4int /* componentId */) const
{
  // Returns the sum over the shells corresponding to e
  G4double value = 0.;

  std::vector<G4VEMDataSet *>::const_iterator i(components.begin());
  std::vector<G4VEMDataSet *>::const_iterator end(components.end());

  while (i != end)
    {
      value += (*i)->FindValue(energy);
      i++;
    }

  return value;
}


void G4ShellEMDataSet::PrintData(void) const
{
  const size_t n = NumberOfComponents();

  G4cout << "The data set has " << n << " components" << G4endl;
  G4cout << G4endl;
 
  size_t i = 0;
 
  while (i < n)
    {
      G4cout << "--- Component " << i << " ---" << G4endl;
      GetComponent(i)->PrintData();
      i++;
    }
}


void G4ShellEMDataSet::SetEnergiesData(G4DataVector* energies, 
				       G4DataVector* data, 
				       G4int componentId)
{
  G4VEMDataSet* component = components[componentId];
 
  if (component)
    {
      component->SetEnergiesData(energies, data, 0);
      return;
    }

  std::ostringstream message;
  message << "G4ShellEMDataSet::SetEnergiesData - component " << componentId << " not found";
 
  G4Exception(message.str().c_str());
}


void G4ShellEMDataSet::SetLogEnergiesData(G4DataVector* energies,
                                          G4DataVector* data,
                                          G4DataVector* log_energies,
                                          G4DataVector* log_data,
                                          G4int componentId)
{
  G4VEMDataSet* component = components[componentId];
 
  if (component)
    {
      component->SetLogEnergiesData(energies, data, log_energies, log_data, 0);
      return;
    }

  std::ostringstream message;
  message << "G4ShellEMDataSet::SetLogEnergiesData - component " << componentId << " not found";
 
  G4Exception(message.str().c_str());
}



G4bool G4ShellEMDataSet::LoadData(const G4String& file)
{
  CleanUpComponents();

  G4String fullFileName = FullFileName(file);
  std::ifstream in(fullFileName);

  if (!in.is_open())
    {
      G4String message("G4ShellEMDataSet::LoadData - data file \"");
      message += fullFileName;
      message += "\" not found";
      G4Exception(message);
    }

  G4DataVector* orig_shell_energies = 0;
  G4DataVector* orig_shell_data = 0;
  G4DataVector* log_shell_energies = 0;
  G4DataVector* log_shell_data = 0;

  G4double a = 0.;
  G4int shellIndex = 0;
  G4int k = 0;
  G4int nColumns = 2;

  do
    {
      in >> a;

      if (a==0.) a=1e-300;

      // The file is organized into four columns:
      // 1st column contains the values of energy
      // 2nd column contains the corresponding data value
      // The file terminates with the pattern: -1   -1
      //                                       -2   -2
      //
      if (a == -1)
	{
	  if ((k%nColumns == 0) && (orig_shell_energies != 0) )
	    {
	     AddComponent(new G4EMDataSet(shellIndex, orig_shell_energies, orig_shell_data, log_shell_energies, log_shell_data, algorithm->Clone(), unitEnergies, unitData));
	      orig_shell_energies = 0;
	      orig_shell_data = 0;
              log_shell_energies = 0;
              log_shell_data = 0;
	    }
	}
      else if (a != -2)
	{
	  if (orig_shell_energies == 0)
	    {
	     orig_shell_energies = new G4DataVector;
	     orig_shell_data = new G4DataVector;
             log_shell_energies = new G4DataVector;
             log_shell_data = new G4DataVector;
	    }
	  if (k%nColumns == 0)
            {
	     orig_shell_energies->push_back(a*unitEnergies);
	     log_shell_energies->push_back(std::log10(a) + std::log10(unitEnergies));
            }
	  else if (k%nColumns == 1)
            {
	     orig_shell_data->push_back(a*unitData);
             log_shell_data->push_back(std::log10(a) + std::log10(unitData));
            }
          k++;
	}
      else k = 1;
    }
  while (a != -2);  // End of file

  return true;
}


G4bool G4ShellEMDataSet::LoadNonLogData(const G4String& file)
{
  CleanUpComponents();

  G4String fullFileName = FullFileName(file);
  std::ifstream in(fullFileName);

  if (!in.is_open())
    {
      G4String message("G4ShellEMDataSet::LoadData - data file \"");
      message += fullFileName;
      message += "\" not found";
      G4Exception(message);
    }

  G4DataVector* orig_shell_energies = 0;
  G4DataVector* orig_shell_data = 0;

  G4double a = 0.;
  G4int shellIndex = 0;
  G4int k = 0;
  G4int nColumns = 2;

  do
    {
      in >> a;

      // The file is organized into four columns:
      // 1st column contains the values of energy
      // 2nd column contains the corresponding data value
      // The file terminates with the pattern: -1   -1
      //                                       -2   -2
      //
      if (a == -1)
	{
	  if ((k%nColumns == 0) && (orig_shell_energies != 0) )
	    {
	     AddComponent(new G4EMDataSet(shellIndex, orig_shell_energies, orig_shell_data, algorithm->Clone(), unitEnergies, unitData));
	      orig_shell_energies = 0;
	      orig_shell_data = 0;
	    }
	}
      else if (a != -2)
	{
	  if (orig_shell_energies == 0)
	    {
	     orig_shell_energies = new G4DataVector;
	     orig_shell_data = new G4DataVector;
	    }
	  if (k%nColumns == 0)
            {
	     orig_shell_energies->push_back(a*unitEnergies);
            }
	  else if (k%nColumns == 1)
            {
	     orig_shell_data->push_back(a*unitData);
            }
          k++;
	}
      else k = 1;
    }
  while (a != -2);  // End of file

  return true;
}



G4bool G4ShellEMDataSet::SaveData(const G4String& file) const
{
  G4String fullFileName = FullFileName(file);
  std::ofstream out(fullFileName);

  if (!out.is_open())
    {
      G4String message("G4EMDataSet::SaveData - cannot open \"");
      message += fullFileName;
      message += "\"";
      G4Exception(message);
    }
 
  const size_t n = NumberOfComponents();
  size_t k = 0;
 
  while (k < n)
    {
      const G4VEMDataSet* component = GetComponent(k);
  
      if (component)
	{
	  const G4DataVector& energies = component->GetEnergies(0);
	  const G4DataVector& data = component->GetData(0);
 
	  G4DataVector::const_iterator i = energies.begin();
	  G4DataVector::const_iterator endI = energies.end();
	  G4DataVector::const_iterator j = data.begin();
  
	  while (i != endI)
	    {
	      out.precision(10);
	      out.width(15);
	      out.setf(std::ofstream::left);
	      out << ((*i)/unitEnergies) << ' ';

	      out.precision(10);
	      out.width(15);
	      out.setf(std::ofstream::left);
	      out << ((*j)/unitData) << std::endl;
	      i++;
	      j++;
	    }
	}
  
      out.precision(10);
      out.width(15);
      out.setf(std::ofstream::left);
      out << -1.f << ' ';

      out.precision(10);
      out.width(15);
      out.setf(std::ofstream::left);
      out << -1.f << std::endl;
  
      k++;
    }
 
  out.precision(10);
  out.width(15);
  out.setf(std::ofstream::left);
  out << -2.f << ' ';

  out.precision(10);
  out.width(15);
  out.setf(std::ofstream::left);
  out << -2.f << std::endl;

  return true;
}


void G4ShellEMDataSet::CleanUpComponents(void)
{
  while (!components.empty())
    {
      if (components.back()) delete components.back();
      components.pop_back();
    }
}


G4String G4ShellEMDataSet::FullFileName(const G4String& fileName) const
{
  char* path = getenv("G4LEDATA");
  if (!path)
    G4Exception("G4ShellEMDataSet::FullFileName - G4LEDATA environment variable not set");
  
  std::ostringstream fullFileName;
 
  fullFileName << path << '/' << fileName << z << ".dat";
                      
  return G4String(fullFileName.str().c_str());
}