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// ------------------------------------------------------------
//      GEANT 4 class header file
//
//      History: first implementation, based on object model of
//      27 July 1996 H.Kurashige
//      30 May 1997 H.Kurashige
//      24 May 2012 H.Kurashige    Add current_parent_mass;
// ------------------------------------------------------------
#ifndef G4PhaseSpaceDecayChannel_h
#define G4PhaseSpaceDecayChannel_h 1

#include "G4ios.hh"
#include "globals.hh"
#include "G4VDecayChannel.hh"
#include "G4Cache.hh"

class G4PhaseSpaceDecayChannel :public G4VDecayChannel
{
  public:  // With Description
    enum {MAX_N_DAUGHTERS=4}; 
    //Constructors 
      G4PhaseSpaceDecayChannel(G4int Verbose = 1);
      G4PhaseSpaceDecayChannel(const G4String& theParentName,
			       G4double        theBR,
			       G4int           theNumberOfDaughters,
			       const G4String& theDaughterName1,
			       const G4String& theDaughterName2 = "",
			       const G4String& theDaughterName3 = "",
			       const G4String& theDaughterName4 = ""   );

   // give daughter masses instead of sampling masses 
   // according to PDG mass and width. 
     G4bool SetDaughterMasses( G4double masses[]);
  
     G4bool SampleDaughterMasses();

  public: 
   //  Destructor
     virtual ~G4PhaseSpaceDecayChannel();

  public:  // With Description
     virtual G4DecayProducts *DecayIt(G4double);   
     G4bool  IsOKWithParentMass(G4double parentMass);

  public: 
     static G4double Pmx(G4double e, G4double p1, G4double p2);
 
  private:
     //A thread-local object
     G4Cache<G4double> current_parent_mass;
     G4DecayProducts *OneBodyDecayIt();
     G4DecayProducts *TwoBodyDecayIt();
     G4DecayProducts *ThreeBodyDecayIt();
     G4DecayProducts *ManyBodyDecayIt();
     G4bool           useGivenDaughterMass;
     G4double         givenDaughterMasses[MAX_N_DAUGHTERS];
};  


#endif
