GFlavorMixerFactory.cxx

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//____________________________________________________________________________
/*!
 Copyright (c) 2003-2020, The GENIE Collaboration
 For the full text of the license visit http://copyright.genie-mc.org

 Robert Hatcher <rhatcher@fnal.gov>
 Fermi National Accelerator Laboratory
*/
//____________________________________________________________________________

#include "Tools/Flux/GFlavorMixerFactory.h"
#include "Framework/Messenger/Messenger.h"

namespace genie {
namespace flux {

// Define static variable which holds the one-and-only instance
GFlavorMixerFactory* GFlavorMixerFactory::fgTheInstance;

GFlavorMixerFactory::GFlavorMixerFactory()
{
  fgTheInstance = this;   // record created self in static pointer
}

GFlavorMixerFactory::~GFlavorMixerFactory()
{
  fgTheInstance = 0;
}

GFlavorMixerFactory& GFlavorMixerFactory::Instance()
{
  // Cleaner dtor calls GFlavorMixerFactory dtor at job end
  static Cleaner cleaner;

  if ( ! fgTheInstance ) {
    // need to create one
    cleaner.UseMe();   // dummy call to quiet compiler warnings
    fgTheInstance = new GFlavorMixerFactory();
  }

  return *fgTheInstance;
}

GFlavorMixerI*
GFlavorMixerFactory::GetFlavorMixer(const std::string& name)
{
  GFlavorMixerI* p = 0;

  // we don't want map creating an entry if it doesn't exist
  // so use map::find() not map::operator[]
  std::map<std::string, GFlavorMixerICtorFuncPtr_t>::iterator itr
    = fFunctionMap.find(name);
  if ( fFunctionMap.end() != itr ) {
    // found an appropriate entry in the list
    GFlavorMixerICtorFuncPtr_t foo = itr->second;  // this is the function
    p = (*foo)();  // use function to create the GFlavorMixerI
  }
  if ( ! p ) {
    LOG("Flux",pWARN) << "### GFlavorMixerFactory WARNING: "
                      << "GFlavorMixerI " << name << " is not known";
  }
  return p;
}

bool GFlavorMixerFactory::IsKnownFlavorMixer(const std::string& name)
{
  //  check if we know the name
  bool res = false;
  std::map<std::string, GFlavorMixerICtorFuncPtr_t>::iterator itr
    = fFunctionMap.find(name);
  if ( fFunctionMap.end() != itr ) res = true;
  return res;
}

const std::vector<std::string>&
GFlavorMixerFactory::AvailableFlavorMixers() const
{
  // list of names might be out of date due to new registrations
  // rescan the std::map on each call (which won't be frequent)
  listnames.clear();

  // scan map for registered names
  std::map<std::string, GFlavorMixerICtorFuncPtr_t>::const_iterator itr;
  for ( itr = fFunctionMap.begin(); itr != fFunctionMap.end(); ++itr )
    listnames.push_back(itr->first);

  return listnames;
}

bool GFlavorMixerFactory::RegisterCreator(std::string name,
                                          GFlavorMixerICtorFuncPtr_t foo,
                                          bool* boolptr)
{
  // record new functions for creating processes
  fFunctionMap[name] = foo;
  fBoolPtrMap[name]  = boolptr;
  return true;
}

} // namespace flux
} // namespace genie