#ifndef STNTUPLE_TSvxDataBlock
#define STNTUPLE_TSvxDataBlock
//-----------------------------------------------------------------------------
// This is a pared down version of SiHitSet.  It is just a
// TClonesArray of TStnSiHit objects and some information about what
// version of the silicon geometry was used.
//
// If you want to know which hits were used in which TStnTrack's, you
// should use the correspondance object TStnTrackLink.
//
//  Author:    Aaron Dominguez (CDF/LBNL)
//  Date:      Apr 17 2001
//-----------------------------------------------------------------------------

#include "Stntuple/obj/TStnDataBlock.hh"
#include "Stntuple/obj/TStnSiHit.hh"
#include "Stntuple/obj/TStnSiDigiCode.hh"
#include "TClonesArray.h"
#include "TArrayI.h"
#include "Stntuple/obj/TStnLinkBlock.hh"

// Forward decls for lookup table.
class SiHitLookup;


class TSvxDataBlock: public TStnDataBlock {

  friend Int_t StntupleInitSvxDataBlock(TStnDataBlock*, AbsEvent*, int);
  friend Int_t StntupleTrackLinkBlockLinks(TStnDataBlock*, AbsEvent*, int);
  friend Int_t StntupleSvxDataBlockLinks(TStnDataBlock*, AbsEvent*, int);
public:
//------------------------------------------------------------------------------
//  data members
//------------------------------------------------------------------------------
  Int_t          fNSiHits;                     // Total number of hits.
  TClonesArray*  fSiHitList;                   // Flat array of hits.
  
  Int_t*         fIndexFirstHit;               //! Used for looping over
  Int_t*         fIndexLastHit;                //! hits in one halfladder.
  UInt_t         fMaxDigiCode;                 //! Array size for Indexes.

  TArrayI        fDigiCodes;                   // List of all detector
                                               // elements with hits.
                                               // These three arrays are
  TArrayI        fDigiCodeFirstHit;            // used to puff up the 
  TArrayI        fDigiCodeLastHit;             // look-up tables.

  TStnLinkBlock  fSiStripLinkHit;              // (Optional) Links to strips used in hit
//-----------------------------------------------------------------------------
//  functions
//-----------------------------------------------------------------------------
public:
					// ****** constructors and destructor
  TSvxDataBlock();
  virtual ~TSvxDataBlock();

					// ****** init methods

  Int_t         InitEvent(Int_t flag=0);

					// ****** accessors

  Int_t         NSiHits  () const { return fNSiHits; }
  TClonesArray* SiHitList() const { return fSiHitList; }

  TStnSiHit*    SiHit(int i) const { 
    return (TStnSiHit*) fSiHitList->UncheckedAt(i); 
  }

  // Get indexes to first and last hit on detector element if you
  // already know the digicode
  Int_t IndexFirstHit(unsigned int digiCode) const {
    return (digiCode<=fMaxDigiCode ? fIndexFirstHit[digiCode] : -1);}
  Int_t IndexLastHit(unsigned int digiCode) const {
    return (digiCode<=fMaxDigiCode ? fIndexLastHit[digiCode] : -2);}

  // Same as above, but if you only know barrel, layer, phi, etc

  Int_t IndexFirstHit(int barrel, int ladderSeg, int phiWedge, 
		      int layer, int side) const 
  {
    TStnSiDigiCode code(barrel, ladderSeg, phiWedge, layer, side);
    return (code.fDigiCode<=fMaxDigiCode ? fIndexFirstHit[code.fDigiCode] : -1);
  }

  Int_t IndexLastHit(int barrel, int ladderSeg, int phiWedge, 
		     int layer, int side) const 
  {
    TStnSiDigiCode code(barrel, ladderSeg, phiWedge, layer, side);
    return (code.fDigiCode<=fMaxDigiCode ? fIndexLastHit[code.fDigiCode] : -1);
  }
					// ****** modifiers
  TStnSiHit*      NewSiHit() {
    return new ((*fSiHitList)[fNSiHits++]) TStnSiHit();
  }

  TStnLinkBlock* SiStripLinkHit() {return &fSiStripLinkHit;}

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

private: 
  // Lookup table (which is not streamed out) to cross reference our
  // SiHit's with Rick's SiHit's.  Supposed to be direct lookup and fast.
  // 2002.12.24 P.M.: in normal life fId is SiHitLookup

  TObject    *fId; //!

  ClassDef(TSvxDataBlock,4)
};

#endif