//
// ********************************************************************
// * License and Disclaimer                                           *
// *                                                                  *
// * The  Geant4 software  is  copyright of the Copyright Holders  of *
// * the Geant4 Collaboration.  It is provided  under  the terms  and *
// * conditions of the Geant4 Software License,  included in the file *
// * LICENSE and available at  http://cern.ch/geant4/license .  These *
// * include a list of copyright holders.                             *
// *                                                                  *
// * Neither the authors of this software system, nor their employing *
// * institutes,nor the agencies providing financial support for this *
// * work  make  any representation or  warranty, express or implied, *
// * regarding  this  software system or assume any liability for its *
// * use.  Please see the license in the file  LICENSE  and URL above *
// * for the full disclaimer and the limitation of liability.         *
// *                                                                  *
// * This  code  implementation is the result of  the  scientific and *
// * technical work of the GEANT4 collaboration.                      *
// * By using,  copying,  modifying or  distributing the software (or *
// * any work based  on the software)  you  agree  to acknowledge its *
// * use  in  resulting  scientific  publications,  and indicate your *
// * acceptance of all terms of the Geant4 Software license.          *
// ********************************************************************
//
//
// $Id$

#ifndef G4FTFAnnihilation_h
#define G4FTFAnnihilation_h 1
// ------------------------------------------------------------
//      GEANT 4 class header file
//
//      ---------------- G4FTFAnnihilation       --------------
//             by Vladimir Uzhinsky, November 2010.
//          Annihilation used by Fritiof (FTF) model
//	          Takes a projectile and a target
//	        Produces strings (excited hadrons)
// ------------------------------------------------------------

#include "globals.hh"
class G4VSplitableHadron;
class G4ExcitedString;
#include "G4FTFParameters.hh"
#include "G4ThreeVector.hh"

class G4FTFAnnihilation 
{

  public:

      G4FTFAnnihilation();
      virtual ~G4FTFAnnihilation();

      virtual G4bool         Annihilate (G4VSplitableHadron *aPartner, 
                                         G4VSplitableHadron * bPartner,
                                         G4VSplitableHadron *& AdditionalString,
                                         G4FTFParameters *theParameters) const;

  private:

      G4FTFAnnihilation(const G4FTFAnnihilation &right);
      
      G4ThreeVector GaussianPt(G4double  AveragePt2, G4double maxPtSquare) const;
      G4double ChooseX(G4double Alpha, G4double Beta) const;

      void UnpackBaryon(G4int IdPDG, G4int &Q1, G4int &Q2, G4int &Q3) const;

      const G4FTFAnnihilation & operator=(const G4FTFAnnihilation &right);
      int operator==(const G4FTFAnnihilation &right) const;
      int operator!=(const G4FTFAnnihilation &right) const;

};

#endif