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// $Id: G4VDecayChannel.hh 73762 2013-09-10 12:53:56Z gcosmo $
//
//
// ------------------------------------------------------------
//      GEANT 4 class header file
//
//      History: first implementation, based on object model of
//      27 July 1996 H.Kurashige
//      30 May  1997 H.Kurashige
//      23 Mar. 2000 H.Weber      : add GetAngularMomentum()
// ------------------------------------------------------------
#ifndef G4VDecayChannel_h
#define G4VDecayChannel_h 1

#include <cmath>

#include "G4ios.hh"
#include "globals.hh"
/////@@#include "G4PDefSplitter.hh"

class    G4ParticleDefinition;
class    G4DecayProducts;
class    G4ParticleTable;

/////@@class G4DecayChannelData
/////@@{
/////@@  // Encapsulates the fields associated to the class G4VDecayChannel that
/////@@  // may not be read-only.
/////@@
/////@@  public:
/////@@
/////@@    void initialize()
/////@@    {
/////@@      parent = 0;
/////@@      daughters = 0;
/////@@      parent_mass = 0.0;
/////@@      daughters_mass = 0;
/////@@    }
/////@@
/////@@    G4ParticleDefinition*  parent;
/////@@    G4ParticleDefinition** daughters;
/////@@    G4double               parent_mass;
/////@@    G4double*              daughters_mass;
/////@@};
/////@@
/////@@// The type G4DecayChannelManager is introduced to encapsulate the methods used
/////@@// by both the master thread and worker threads to allocate memory space for
/////@@// the fields encapsulated by the class G4DecayChannelData. When each thread
/////@@// initializes the value for these fields, it refers to them using a macro
/////@@// definition defined below. For every G4DecayChannel instance, there is
/////@@// a corresponding G4DecayChannelData instance. All G4DecayChannelData
/////@@// instances are organized by the class G4DecayChannelManager as an array.
/////@@// The field "int instanceID" is added to the class G4DecayChannel.
/////@@// The value of this field in each G4DecayChannel instance is the subscript
/////@@// of the corresponding G4DecayChannelData instance.
/////@@// In order to use the class G4DecayChannelManager, we add a static member in
/////@@// G4DecayChannel as follows: "static G4DecayChannelManager subInstanceManager".
/////@@// For the master thread, the array for G4DecayChannelData instances grows
/////@@// dynamically along with G4DecayChannel instances are created.
/////@@// For each worker thread, it copies the array of  G4DecayChannelData instances
/////@@// from the master thread.
/////@@// In addition, it invokes a method similiar to the constructor explicitly
/////@@// to achieve the partial effect for each instance in the array.
/////@@//
/////@@typedef G4PDefSplitter<G4DecayChannelData> G4DecayChannelManager;
/////@@
/////@@// These macros change the references to fields that are now encapsulated
/////@@// in the class G4DecayChannelData.
/////@@//
/////@@#define G4MT_parent ((G4VDecayChannel::subInstanceManager.offset[instanceID]).parent)
/////@@#define G4MT_daughters ((G4VDecayChannel::subInstanceManager.offset[instanceID]).daughters)
/////@@#define G4MT_parent_mass ((G4VDecayChannel::subInstanceManager.offset[instanceID]).parent_mass)
/////@@#define G4MT_daughters_mass ((G4VDecayChannel::subInstanceManager.offset[instanceID]).daughters_mass)
/////@@
class G4VDecayChannel
{
  // Class Description:
  //
  // Abstract class to describe decay kinematics

  public:  // with description

    // Constructors 
    G4VDecayChannel(const G4String &aName, G4int Verbose = 1);
    G4VDecayChannel(const G4String  &aName, 
		    const G4String& theParentName,
		    G4double        theBR,
		    G4int           theNumberOfDaughters,
		    const G4String& theDaughterName1,
		    const G4String& theDaughterName2 = "",
		    const G4String& theDaughterName3 = "",
		    const G4String& theDaughterName4 = "" );

    // Destructor
    virtual ~G4VDecayChannel();

    // equality operators
    G4int operator==(const G4VDecayChannel &right) const {return (this == &right);}
    G4int operator!=(const G4VDecayChannel &right) const {return (this != &right);}

    // less-than operator is defined for G4DecayTable
    G4int operator<(const G4VDecayChannel &right) const;

    virtual G4DecayProducts* DecayIt(G4double parentMass = -1.0) = 0;

    // get kinematics name
    const G4String&  GetKinematicsName() const;
    // get branching ratio
    G4double   GetBR() const;
    // get number of daughter particles
    G4int      GetNumberOfDaughters() const;     

    // get the pointer to the parent particle
    G4ParticleDefinition * GetParent();
    // get the pointer to a daughter particle 
    G4ParticleDefinition * GetDaughter(G4int anIndex);

    // get the angular momentum of the decay
    G4int GetAngularMomentum();
    // get the name of the parent particle
    const G4String& GetParentName() const;
    //get the name of a daughter particle
    const G4String& GetDaughterName(G4int anIndex) const;

    // get mass of parent
    G4double GetParentMass() const; 
    G4double GetDaughterMass(G4int anIndex) const; 

    // set the parent particle (by name or by pointer) 
    void SetParent(const G4ParticleDefinition * particle_type);
    void SetParent(const G4String &particle_name);
    // set branching ratio
    void SetBR(G4double value); 
    // set number of daughter particles
    void SetNumberOfDaughters(G4int value);     
    // set a daughter particle (by name or by pointer) 
    void SetDaughter(G4int anIndex, 
                     const G4ParticleDefinition * particle_type);
    void SetDaughter(G4int anIndex, 
                     const G4String &particle_name);

    void  SetVerboseLevel(G4int value);
    G4int GetVerboseLevel()  const;
    void  DumpInfo();

/////@@  public:  // without description
/////@@
/////@@    // returns the instance ID.
/////@@    inline G4int GetInstanceID() const;
/////@@    // returns the private data instance manager.
/////@@    static const G4DecayChannelManager& GetSubInstanceManager();

  protected: // with description

    // clear daughters array
    void ClearDaughtersName();

    // fill daughters array
    void FillDaughters();
    // fill parent
    void FillParent();

  protected: // without description

    // default constructor
    G4VDecayChannel();

    // copy constructor and assignment operator
    G4VDecayChannel(const G4VDecayChannel &);
    G4VDecayChannel & operator=(const G4VDecayChannel &);

  private:

    const G4String& GetNoName() const;

  protected:

    // kinematics name
    G4String   kinematics_name;
    // branching ratio  [0.0 - 1.0]
    G4double   rbranch;
    // number of daughters
    G4int      numberOfDaughters;
    // parent particle
    G4String*  parent_name;
    // daughter particles
    G4String** daughters_name;

    // pointer to particle table
    G4ParticleTable*       particletable;

    // control flag for output message
    G4int verboseLevel;
    //  0: Silent
    //  1: Warning message
    //  2: More

    static const G4String noName;

/////@@    // This field is used as instance ID.
/////@@    G4int instanceID;
/////@@    // This field helps to use the class G4DecayChannelManager introduced above.
/////@@    G4PART_DLL static G4DecayChannelManager subInstanceManager;
    G4ParticleDefinition*  G4MT_parent;
    G4ParticleDefinition** G4MT_daughters;
    G4double               G4MT_parent_mass;
    G4double*              G4MT_daughters_mass;
};

// ------------------------------------------------------------
// Inline methods
// ------------------------------------------------------------

inline
 G4int G4VDecayChannel::operator<(const G4VDecayChannel &right) const
{
  return (this->rbranch < right.rbranch);
}

inline 
  G4ParticleDefinition* G4VDecayChannel::GetDaughter(G4int anIndex)
 { 
  // pointers to daughter particles are filled, if they are not set yet 
  if (G4MT_daughters == 0) FillDaughters();

  // get the pointer to a daughter particle
  if ( (anIndex>=0) && (anIndex<numberOfDaughters) ) {
    return G4MT_daughters[anIndex];
  } else {
    if (verboseLevel>0)
      G4cout << "G4VDecayChannel::GetDaughter  index out of range "<<anIndex<<G4endl;
    return 0;
  }
}

inline
 const G4String& G4VDecayChannel::GetDaughterName(G4int anIndex) const
{
  if ( (anIndex>=0) && (anIndex<numberOfDaughters) ) {
    return *daughters_name[anIndex];
  } else {
    if (verboseLevel>0){
      G4cout << "G4VDecayChannel::GetDaughterName ";
      G4cout << "index out of range " << anIndex << G4endl;
    }
    return GetNoName();
  }
}

inline
 G4double G4VDecayChannel::GetDaughterMass(G4int anIndex) const
{
  if ( (anIndex>=0) && (anIndex<numberOfDaughters) ) {
    return G4MT_daughters_mass[anIndex];
  } else {
    if (verboseLevel>0){
      G4cout << "G4VDecayChannel::GetDaughterMass ";
      G4cout << "index out of range " << anIndex << G4endl;
    }
    return 0.0;
  }
}

inline 
  G4ParticleDefinition* G4VDecayChannel::GetParent()
{ 
  // the pointer to the parent particle is filled, if it is not set yet 
  if (G4MT_parent == 0) FillParent();
  // get the pointer to the parent particle
  return G4MT_parent;
}

inline
 const G4String& G4VDecayChannel::GetParentName() const
{
  return *parent_name;
}

inline
 G4double G4VDecayChannel::GetParentMass() const
{
  return G4MT_parent_mass;
}

inline
  void G4VDecayChannel::SetParent(const G4String &particle_name)
{
  if (parent_name != 0) delete parent_name;
  parent_name = new G4String(particle_name);
  G4MT_parent = 0;
}

inline
 G4int G4VDecayChannel::GetNumberOfDaughters() const 
{ 
  return  numberOfDaughters;
}

inline
 const G4String& G4VDecayChannel::GetKinematicsName() const { return kinematics_name; }

inline
 void  G4VDecayChannel::SetBR(G4double value){ rbranch = value; }

inline
 G4double G4VDecayChannel::GetBR() const { return rbranch; }

inline
 void  G4VDecayChannel::SetVerboseLevel(G4int value){ verboseLevel = value; }

inline
 G4int G4VDecayChannel::GetVerboseLevel() const { return verboseLevel; }

/////@@inline
/////@@ G4int G4VDecayChannel::GetInstanceID() const { return instanceID; }

#endif