#ifndef Stntuple_obj_TStnTrackLinkBlock_hh
#define Stntuple_obj_TStnTrackLinkBlock_hh
//-----------------------------------------------------------------------------
//  definition of the STNTUPLE Track link block
//  Authors:    Aaron Dominguez (LBNL/CDF)
//  Date:       Apr 20, 2001
// 
// This has simple array of integers to link tracks to their
// associated hits.  This must be filled AFTER both the TStnTrackBlock
// and TSvxDataBlock are both filled.  Eg, in StntupleMakerModule::event().
//
// Jue 19, 2001: Added links from tracks to TSiIsectBlock.  This gives
//               you access to intersections on silicon halfladders
//               for a given track.  Now must be filled after
//               TSiIsectBlock is made as well (if you requested it)
//-----------------------------------------------------------------------------

#include "Stntuple/obj/TStnDataBlock.hh"
#include "Stntuple/obj/TStnLinkBlock.hh"

class TStnTrackLinkBlock: public TStnDataBlock {
  friend Int_t StntupleTrackLinkBlockLinks(TStnDataBlock* , AbsEvent* , int);
  friend Int_t StntupleSiIsectBlockLinks(TStnDataBlock* , AbsEvent* , int);
public:
//-----------------------------------------------------------------------------
//  data members
//-----------------------------------------------------------------------------
  TStnLinkBlock  fSiHitLinkTrk;		// # links to hits in the silicon

  TStnLinkBlock  fSiIsectLinkTrk;       // # links to track intersections in the silicon
//-----------------------------------------------------------------------------
//  functions
//-----------------------------------------------------------------------------
public:
					// ****** constructors and destructor
  TStnTrackLinkBlock();
  virtual ~TStnTrackLinkBlock();
					// ****** accessors

  TStnLinkBlock*  SiHitLinkTrk() { return &fSiHitLinkTrk; }
  TStnLinkBlock*  SiIsectLinkTrk() { return &fSiIsectLinkTrk; }
					// ****** setters

					// ****** overloaded functions of 
					// TObject
  void Clear(Option_t* opt="");
#ifndef NO_ROOT_CONST
  void Print(Option_t* opt="")const ;
#else 
  void Print(Option_t* opt="");
#endif 

  ClassDef(TStnTrackLinkBlock,1)
};
#endif