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// $Id: G4ElectroNuclearBuilder.cc,v 1.1 2006/10/31 11:35:02 gunter Exp $
// GEANT4 tag $Name: geant4-09-03 $
//
//---------------------------------------------------------------------------
//
// ClassName:   G4ElectroNuclearBuilder
//
// Author: 2002 H.P. Wellisch
//
// Modified: 
// 25.04.2006 V.Ivanchenko fix destructor 
//
//----------------------------------------------------------------------------
//

#include "G4ElectroNuclearBuilder.hh"

#include "globals.hh"
#include "G4ios.hh"

#include "G4ParticleDefinition.hh"
#include "G4ParticleTable.hh"
#include "G4Gamma.hh"
#include "G4Electron.hh"
#include "G4Positron.hh"
#include "G4ProcessManager.hh"

G4ElectroNuclearBuilder::G4ElectroNuclearBuilder() : wasActivated(false)
{
}

G4ElectroNuclearBuilder::~G4ElectroNuclearBuilder() 
{
  if(wasActivated) {
    delete theFragmentation;
    delete theStringDecay;
    delete theStringModel;
    delete thePhotoNuclearProcess; 
    delete theElectronNuclearProcess;
    delete thePositronNuclearProcess;
    delete theElectroReaction;
    delete theGammaReaction;
    delete theModel;
    delete theCascade; 
  }
}

void G4ElectroNuclearBuilder::Build()
{
  if(wasActivated) return;
  wasActivated=true;
  
  thePhotoNuclearProcess = new G4PhotoNuclearProcess;
  theElectronNuclearProcess = new G4ElectronNuclearProcess;
  thePositronNuclearProcess = new G4PositronNuclearProcess;
  theElectroReaction = new G4ElectroNuclearReaction;
  theGammaReaction = new G4GammaNuclearReaction;

  theModel = new G4TheoFSGenerator;

  theStringModel = new G4QGSModel< G4GammaParticipants >;
  theStringDecay = new G4ExcitedStringDecay(theFragmentation=new G4QGSMFragmentation);
  theStringModel->SetFragmentationModel(theStringDecay);

  theCascade = new G4GeneratorPrecompoundInterface;

  theModel->SetTransport(theCascade);
  theModel->SetHighEnergyGenerator(theStringModel);

  G4ProcessManager * aProcMan = 0;
  
  aProcMan = G4Gamma::Gamma()->GetProcessManager();
  theGammaReaction->SetMaxEnergy(3.5*GeV);
  thePhotoNuclearProcess->RegisterMe(theGammaReaction);
  theModel->SetMinEnergy(3.*GeV);
  theModel->SetMaxEnergy(100*TeV);
  thePhotoNuclearProcess->RegisterMe(theModel);
  aProcMan->AddDiscreteProcess(thePhotoNuclearProcess);
  
  aProcMan = G4Electron::Electron()->GetProcessManager();
  theElectronNuclearProcess->RegisterMe(theElectroReaction);
  aProcMan->AddDiscreteProcess(theElectronNuclearProcess);
  
  aProcMan = G4Positron::Positron()->GetProcessManager();
  thePositronNuclearProcess->RegisterMe(theElectroReaction);
  aProcMan->AddDiscreteProcess(thePositronNuclearProcess);
}

