EvtTimeShiftFactory.cxx

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#include "EvtTimeShiftFactory.h"
#include <iostream>
#include <iomanip>

namespace evgb {

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

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

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

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

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

evgb::EvtTimeShiftI* 
EvtTimeShiftFactory::GetEvtTimeShift(const std::string& name,
                                     const std::string& config) const
{
  evgb::EvtTimeShiftI* 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, EvtTimeShiftICtorFuncPtr_t>::const_iterator itr
    = fFunctionMap.find(name);
  if ( fFunctionMap.end() != itr ) { 
    // found an appropriate entry in the list
    EvtTimeShiftICtorFuncPtr_t foo = itr->second;  // this is the function
    p = (*foo)(config);  // use function to create the EvtTimeShiftI
  }
  if ( ! p ) {
    std::cerr << "### EvtTimeShiftFactory WARNING: "
              << "EvtTimeShiftI \"" << name << "\" is not known" << std::endl;
  }
  return p;
}
  
bool EvtTimeShiftFactory::IsKnownEvtTimeShift(const std::string& name)
{
  //  check if we know the name
  bool res = false;
  std::map<std::string, EvtTimeShiftICtorFuncPtr_t>::iterator itr
    = fFunctionMap.find(name);
  if ( fFunctionMap.end() != itr ) res = true;
  return res;
}

const std::vector<std::string>& 
EvtTimeShiftFactory::AvailableEvtTimeShift() 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  // list of names might be out of date due to new registrations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, EvtTimeShiftICtorFuncPtr_t>::const_iterator itr;
  for ( itr = fFunctionMap.begin(); itr != fFunctionMap.end(); ++itr )
    listnames.push_back(itr->first);

  return listnames;
}

void EvtTimeShiftFactory::Print() const
{
  const std::vector<std::string>& known = AvailableEvtTimeShift();
  for (size_t i=0; i < known.size(); ++i) {
    std::cout << "   [" << std::setw(2) << i << "] " << known[i] << std::endl;
  }
}

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

} // namespace evgb