EvtGenExtDecayerPhysics.cc

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//
// $Id: EvtGenExtDecayerPhysics.cc, 2022/08/09 23:49:39 mccumber Exp $
//

#include "EvtGenExtDecayerPhysics.hh"

#include <Geant4/G4Decay.hh>
#include <Geant4/G4ParticleDefinition.hh>
#include <Geant4/G4ParticleTable.hh>  // for G4ParticleTable::G4PTblDi...
#include <Geant4/G4ProcessManager.hh>
#include <Geant4/G4ProcessVector.hh>  // for G4ProcessVector
#include <Geant4/G4String.hh>         // for G4String
#include <Geant4/G4VPhysicsConstructor.hh>
#include <Geant4/G4VProcess.hh>  // for G4VProcess
#include <Geant4/G4Version.hh>

#include <boost/io/ios_state.hpp>

#include <cstddef>  // for size_t
#include <fstream>
#include <iostream>  // for operator<<, endl, basic_o...
#include <string>    // for operator<<

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// hack for Geant 10.03.p03
// Geant 10.02.p02 has this defined
#ifndef aParticleIterator
#define aParticleIterator ((subInstanceManager.offset[g4vpcInstanceID])._aParticleIterator)
#endif

EvtGenExtDecayerPhysics::EvtGenExtDecayerPhysics(const G4String& name)
  : G4VPhysicsConstructor(name)
{
}

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EvtGenExtDecayerPhysics::~EvtGenExtDecayerPhysics()
{
}

//
// protected methods
//

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void EvtGenExtDecayerPhysics::ConstructParticle()
{
}

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void EvtGenExtDecayerPhysics::ConstructProcess()
{
  // EvtGen model initialization changed the behavior of std::cout float print. Recover the default float print format
  boost::io::ios_all_saver ias_cout(std::cout);
  boost::io::ios_all_saver ias_cerr(std::cerr);


  // Create Geant4 external decayer
  extDecayer = new G4EvtGenDecayer();
  extDecayer->SetVerboseLevel(0);

  if (!DecayFile.empty())
  {
    std::ifstream f_local(DecayFile);

    if (f_local.good())
    {
      extDecayer->SetDecayTable(DecayFile, false);
    }
    else
    {
      const char* CALIBRATIONROOT = getenv("CALIBRATIONROOT");
      if (!CALIBRATIONROOT)
      {
        exit(1);
      }
      std::string DecayFileCalibrationRepo = std::string(CALIBRATIONROOT) + "/EvtGen/" + DecayFile;

      std::ifstream f_calib(DecayFileCalibrationRepo);

      if (f_calib.good())
      {
        extDecayer->SetDecayTable(DecayFileCalibrationRepo, false);
      }
      else
      {
        std::cout << __PRETTY_FUNCTION__ << " : Fatal error. Decay file can not be found at "
                  << DecayFile << " nor at " << DecayFileCalibrationRepo << std::endl;

        exit(1);
      }
    }
  }

  aParticleIterator->reset();
  int decayer_used = 0;
  while ((*aParticleIterator)())
  {
    G4ParticleDefinition* particle = aParticleIterator->value();
    G4ProcessManager* pmanager = particle->GetProcessManager();

    if (verboseLevel > 1)
    {
      std::cout << "Setting ext decayer for: "
                << aParticleIterator->value()->GetParticleName()
                << std::endl;
    }

    G4ProcessVector* processVector = pmanager->GetProcessList();
#if G4VERSION_NUMBER >= 1060
    for (size_t i = 0; i < processVector->length(); i++)
#else
    for (G4int i = 0; i < processVector->length(); i++)
#endif
    {
      G4Decay* decay = dynamic_cast<G4Decay*>((*processVector)[i]);
      if (decay)
      {
        // The extDecayer will be deleted in G4Decay destructor
        // increment counter in case we want to print out stats
        // for whatever reason (non null means it is used and
        // must not be deleted)
        //       particle->SetDecayTable(NULL);
        decay->SetExtDecayer(extDecayer);
        decayer_used++;
      }
    }
  }

  // If the extDecayer isn't used for this particle we need to delete it here
  // as far as I see this never happens but this makes coverity happy
  if (!decayer_used)
  {
    delete extDecayer;
  }

  if (verboseLevel > 0)
  {
    std::cout << "External decayer physics constructed." << std::endl;
  }
}

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