#ifndef STNTUPLE_TSiIsectBlock
#define STNTUPLE_TSiIsectBlock
//-----------------------------------------------------------------------------
//  This is a collection of the intersections of tracks with silicon
//  halfladders.  
//
//  If you are looping over tracks, then you can use the
//  correspondance object, TStnTrackLinkBlock, to get access to all
//  intersections for a given track.  You also have immediate access
//  to all silicon hits for this track for comparison.
//  To get all the intersections with a certain halfladder, use the ...
//
//  Author:    Aaron Dominguez (CDF/LBNL)
//  Date:      June 19 2001
//-----------------------------------------------------------------------------

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

#include <vector>

class TSiIsectBlock: public TStnDataBlock {

  friend Int_t StntupleInitSiIsectBlock(TStnDataBlock* block, 
					AbsEvent*      event, 
					int            mode);
  friend Int_t StntupleSiIsectBlockLinks(TStnDataBlock* block, 
					AbsEvent*      event, 
					int            mode);
public:
//------------------------------------------------------------------------------
//  data members
//------------------------------------------------------------------------------
  Int_t          fNSiIsects;                     // Total number of intersections.

  TClonesArray*  fSiIsectList;                   // Flat array of intersections in
						 // blocks of the same track.
  
//-----------------------------------------------------------------------------
//  functions
//-----------------------------------------------------------------------------
public:
					// ****** constructors and destructor
  TSiIsectBlock();
  virtual ~TSiIsectBlock();

					// ****** init methods

  Int_t         InitEvent(Int_t flag=0);

					// ****** accessors
  Int_t         NSiIsects  () { return fNSiIsects; }
  TClonesArray* SiIsectList() { return fSiIsectList; }

  TStnSiIsect*    SiIsect(int i) const { 
    return (TStnSiIsect*) fSiIsectList->UncheckedAt(i); 
  }


					// ****** modifiers
  TStnSiIsect*      NewSiIsect() {
    return new ((*fSiIsectList)[fNSiIsects++]) TStnSiIsect();
  }


					// ****** 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 

  ClassDef(TSiIsectBlock,2)
};

#endif