// @(#)root/eg:$Name:  $:$Id: TDatabasePDG.h,v 1.12 2006/05/23 04:47:36 brun Exp $
// Author: Pasha Murat   12/02/99

/*************************************************************************
 * Copyright (C) 1995-2000, Rene Brun and Fons Rademakers.               *
 * All rights reserved.                                                  *
 *                                                                       *
 * For the licensing terms see $ROOTSYS/LICENSE.                         *
 * For the list of contributors see $ROOTSYS/README/CREDITS.             *
 *************************************************************************/
#ifndef ROOT_TDatabasePDG
#define ROOT_TDatabasePDG

#ifndef ROOT_TParticlePDG
#include "TParticlePDG.h"
#endif
#ifndef ROOT_THashList
#include "THashList.h"
#endif
#ifndef ROOT_TParticleClassPDG
#include "TParticleClassPDG.h"
#endif

class TDatabasePDG: public TNamed {

protected:
   static TDatabasePDG *fgInstance;        // protect against multiple instances
   THashList* fParticleList;               // list of PDG particles
   TObjArray* fListOfClasses;              // list of classes (leptons etc.)

   TDatabasePDG(const TDatabasePDG& db) 
     : TNamed(db), fParticleList(db.fParticleList),
     fListOfClasses(db.fListOfClasses) { }

   TDatabasePDG& operator=(const TDatabasePDG& db)
     {if(this!=&db) {TNamed::operator=(db); fParticleList=db.fParticleList;
     fListOfClasses=db.fListOfClasses;} return *this;}
  
public:

   TDatabasePDG();
   virtual ~TDatabasePDG();
 
   static TDatabasePDG*  Instance();

   virtual TParticlePDG*   AddParticle(const char*  Name, 
                                       const char*  Title,
                                       Double_t     Mass, 
                                       Bool_t       Stable,
                                       Double_t     DecayWidth, 
                                       Double_t     Charge, 
                                       const char*  ParticleClass,
                                       Int_t        PdgCode,
                                       Int_t        Anti=-1,
                                       Int_t        TrackingCode=0);

   virtual Int_t  ConvertGeant3ToPdg(Int_t Geant3Number);
   virtual Int_t  ConvertPdgToGeant3(Int_t pdgNumber);
   virtual Int_t  ConvertIsajetToPdg(Int_t isaNumber);

   virtual TParticlePDG* AddAntiParticle(const char* Name, Int_t PdgCode);
                                
   TParticlePDG  *GetParticle(Int_t pdgCode) const;
   TParticlePDG  *GetParticle(const char *name) const;

   TParticleClassPDG* GetParticleClass(const char* name) {
      if (fParticleList == 0)  ((TDatabasePDG*)this)->ReadPDGTable(); 
      return (TParticleClassPDG*) fListOfClasses->FindObject(name);
   }

   const THashList *ParticleList() const { return fParticleList; }

   virtual void   Print(Option_t *opt = "") const;

   Bool_t IsFolder() const { return kTRUE; }
   virtual void   Browse(TBrowser* b);

   virtual void   ReadPDGTable (const char *filename = "");
   virtual Int_t  WritePDGTable(const char *filename);

   ClassDef(TDatabasePDG,2)  // PDG particle database

};

#endif
