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// ====================================================================
//
//   ExN04PrimaryGeneratorAction.cc
//   $Id: ExN04PrimaryGeneratorAction.cc,v 1.5 2006/07/05 11:06:36 gcosmo Exp $
//
// ====================================================================
#include "ExN04PrimaryGeneratorAction.hh"
#include "ExN04PrimaryGeneratorMessenger.hh"

#include "G4Event.hh"
#include "G4ParticleGun.hh"
#include "HepMCG4AsciiReader.hh"
#include "HepMCG4PythiaInterface.hh"

//////////////////////////////////////////////////////////
ExN04PrimaryGeneratorAction::ExN04PrimaryGeneratorAction()
//////////////////////////////////////////////////////////
{
  // default generator is particle gun.
  currentGenerator= particleGun= new G4ParticleGun();
  currentGeneratorName= "particleGun";
  hepmcAscii= new HepMCG4AsciiReader();
#ifdef G4LIB_USE_PYTHIA
  pythiaGen= new HepMCG4PythiaInterface();
#else
  pythiaGen= 0;
#endif
  gentypeMap["particleGun"]= particleGun;
  gentypeMap["hepmcAscii"]= hepmcAscii;
  gentypeMap["pythia"]= pythiaGen;

  messenger= new ExN04PrimaryGeneratorMessenger(this);  
}

///////////////////////////////////////////////////////////
ExN04PrimaryGeneratorAction::~ExN04PrimaryGeneratorAction()
///////////////////////////////////////////////////////////
{
  delete messenger;
}

/////////////////////////////////////////////////////////////////////
void ExN04PrimaryGeneratorAction::GeneratePrimaries(G4Event* anEvent)
/////////////////////////////////////////////////////////////////////
{
  if(currentGenerator)
    currentGenerator-> GeneratePrimaryVertex(anEvent);
  else 
    G4Exception("generator is not instanciated.");
}