G4ParticleHPEnergyDistribution.hh

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// P. Arce, June-2014 Conversion neutron_hp to particle_hp
//
#ifndef G4ParticleHPEnergyDistribution_h
#define G4ParticleHPEnergyDistribution_h 1
 
#include "G4ParticleHPArbitaryTab.hh"
#include "G4ParticleHPEvapSpectrum.hh"
#include "G4ParticleHPFissionSpectrum.hh"
#include "G4ParticleHPMadlandNixSpectrum.hh"
#include "G4ParticleHPSimpleEvapSpectrum.hh"
#include "G4ParticleHPWattSpectrum.hh"
#include "G4VParticleHPEDis.hh"
#include "G4ios.hh"
#include "Randomize.hh"
#include "globals.hh"
 
#include <fstream>
 
// we will need a List of these .... one per term.
 
class G4ParticleHPEnergyDistribution
{
  public:
    G4ParticleHPEnergyDistribution()
    {
      theEnergyDistribution = nullptr;
      theNumberOfPartials = 0;
      theRepresentationType = 0;
    }
    ~G4ParticleHPEnergyDistribution()
    {
      if (theEnergyDistribution != nullptr) {
        for (G4int i = 0; i < theNumberOfPartials; i++) {
          delete theEnergyDistribution[i];
        }
        delete[] theEnergyDistribution;
      }
    }
 
    inline void Init(std::istream& theData)
    {
      G4double dummy;
      theData >> dummy >> theNumberOfPartials;
      theEnergyDistribution = new G4VParticleHPEDis*[theNumberOfPartials];
      for (G4int i = 0; i < theNumberOfPartials; i++) {
        theData >> theRepresentationType;
        switch (theRepresentationType) {
          case 1:
            theEnergyDistribution[i] = new G4ParticleHPArbitaryTab;
            break;
          case 5:
            theEnergyDistribution[i] = new G4ParticleHPEvapSpectrum;
            break;
          case 7:
            theEnergyDistribution[i] = new G4ParticleHPFissionSpectrum;
            break;
          case 9:
            theEnergyDistribution[i] = new G4ParticleHPSimpleEvapSpectrum;
            break;
          case 11:
            theEnergyDistribution[i] = new G4ParticleHPWattSpectrum;
            break;
          case 12:
            theEnergyDistribution[i] = new G4ParticleHPMadlandNixSpectrum;
            break;
    default:
            theEnergyDistribution[i] = new G4ParticleHPArbitaryTab;
        }
        theEnergyDistribution[i]->Init(theData);
      }
    }
 
    inline G4double Sample(G4double anEnergy, G4int& it)
    {
      G4double result = 0;
      it = 0;
      if (theNumberOfPartials != 0) {
        G4double sum = 0;
        auto running = new G4double[theNumberOfPartials];
        running[0] = 0;
        G4int i;
        for (i = 0; i < theNumberOfPartials; i++) {
          if (i != 0) running[i] = running[i - 1];
          running[i] += theEnergyDistribution[i]->GetFractionalProbability(anEnergy);
        }
        sum = running[theNumberOfPartials - 1];
        G4double random = G4UniformRand();
        for (i = 0; i < theNumberOfPartials; i++) {
          it = i;
          if (running[i] / sum > random) break;
        }
        delete[] running;
        if (it == theNumberOfPartials) it--;
        result = theEnergyDistribution[it]->Sample(anEnergy);
      }
      return result;
    }
 
  private:
    G4int theNumberOfPartials;
    G4int theRepresentationType;
    G4VParticleHPEDis** theEnergyDistribution;
};
 
#endif