#ifndef ALIITSDIGITZER_H
#define ALIITSDIGITZER_H
/* Copyright (c) 1998-2001, ALICE Experiment at CERN, All rights reserved *
 * See cxx source for full Copyright notice                               */

/*
  $Id$
 */

class TObjArray;
class TTree;

#include <TClonesArray.h> // function of this class used in inline functions.

class AliRunDigitizer;

#include "AliDigitizer.h" // Base class from which this one is derived
#include "AliITS.h"   // ITS class functions used in inline functions.
class AliITSmodule;

class AliITSDigitizer : public AliDigitizer{
 public:
    AliITSDigitizer();
    AliITSDigitizer(AliRunDigitizer *manager);
    virtual ~AliITSDigitizer();
    // Standard routines.
    virtual Bool_t Init();
    // Perform SDigits to Digits, with or without merging, depending on the
    // number of files.
    virtual void Exec(Option_t* opt=0);
    // Sets a particular module active
    virtual void SetModuleActive(Int_t i){if(fActive) fActive[i] = kTRUE;}
    // Sets a particular module inactive
    virtual void SetModuleInActive(Int_t i){if(fActive) fActive[i] = kFALSE;}
    // Sets Region of Interst Flag. if fRiof=0 then no Region of Interest
    // cut applyed
    virtual void SetByRegionOfInterestFlag(Int_t i=0){fRoif = i;};
    // Sets the SDigits file number to  be used to define the region of 
    // interest. Default is file=-1, assumed that a region of interest
    // cut will be applied. A value of 0 means no cut to be applyed. Other
    // values have yet to be defined.
    virtual void SetByRegionOfFileNumber(Int_t i=-1){fRoiifile = i;};
    // Clears the region of interest flag. Calling this implies that a
    // Region of interest cut will not be made.
    virtual void ClearByRegionOfInterestFlag(){fRoif = 0;};
 private:
    // Routines used internaly
    // Returns a pointer to the TObjecArray of Modules.
    TObjArray* GetModules(){return fITS->GetModules();}
    // Returns a pointer to a  specific module.
    AliITSmodule* GetModule(Int_t i){return fITS->GetModule(i);}
    // Returns a pointer to the manager
    AliRunDigitizer* GetManager(){return fManager;}
    // Sets the region of Interest based on which module have SDigits
    // Defined (non-noise SDigits).
    virtual void SetByRegionOfInterest(TTree *ts);
 private:
    AliITS *fITS;      //! local pointer to ITS
    Bool_t *fActive;   //! flag to indicate which module to digitize.
    Bool_t  fInit;     //! flag to indecate Initilization when well.
    Int_t   fRoif;     //! Region of interest flag.
    Int_t   fRoiifile; //! The file number with which to determing the region
                       // of interest from.

    ClassDef(AliITSDigitizer,1) // Task to Digitize ITS from summable hits.
};
#endif