#ifndef ALIITSSIMULATION_H
#define ALIITSSIMULATION_H
/**************************************************************************
 * Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
 *                                                                        *
 * Author: The ALICE Off-line Project.                                    *
 * Contributors are mentioned in the code where appropriate.              *
 *                                                                        *
 * Permission to use, copy, modify and distribute this software and its   *
 * documentation strictly for non-commercial purposes is hereby granted   *
 * without fee, provided that the above copyright notice appears in all   *
 * copies and that both the copyright notice and this permission notice   *
 * appear in the supporting documentation. The authors make no claims     *
 * about the suitability of this software for any purpose. It is          *
 * provided "as is" without express or implied warranty.                  *
 **************************************************************************/
/* $Id$ */

#include <TObject.h>

class AliITSresponse;
class AliITSsegmentation;
class AliITSmodule;
class TRandom;
class AliITSpList;
class TClonesArray;

// This is the base class for ITS detector signal simulations. Data members
// include are a pointer to the detectors specific response and segmentation
// classes. See the detector specific implementations for the propper code.

class AliITSsimulation : public TObject {

 public:
    AliITSsimulation(); // Default constructor
    virtual ~AliITSsimulation(); // destructor
    // copy constructor. See detector specific implementation.
    AliITSsimulation(const AliITSsimulation &source);
    // Assignment opporator. See detector specific implementation.
    virtual AliITSsimulation& operator=(const AliITSsimulation &source);

    // *****************  Hits -> SDigits ******************
    // digitize module using the "slow" detector simulator creating
    // summable digits.
    virtual void SDigitiseModule(AliITSmodule *mod,Int_t module,Int_t event){;}

    // ***************** sum of SDigits -> Digits **********
    // Reset module arrays (maps), etc
    virtual void InitSimulationModule( Int_t module, Int_t event ){;}
    // add (sum) a new list of summable digits to module, 
    // add an offset (mask) to the track numbers. Returns kTRUE if there
    // is a "good" signal in this module.
    virtual Bool_t AddSDigitsToModule( TClonesArray *pItemArray, Int_t mask );
    // digitize module using the "slow" detector simulator from
    // the sum of summable digits.
    virtual void FinishSDigitiseModule(){;}

    // **************** Hits -> Digits *********************
    // digitize module using the "slow" detector simulator creating digits.
    virtual void DigitiseModule(AliITSmodule *mod,Int_t module,Int_t event) {;}
    // digitizes module using the "fast" detector simulator.
    virtual void CreateFastRecPoints(AliITSmodule *mod,Int_t module,
				     TRandom *rndm) {}
    // Return pointer to Response model
    virtual AliITSresponse* GetResponseModel(){return fResponse;}
    // set pointer to Response model
    virtual void SetResponseModel(AliITSresponse *res){fResponse = res;}
    // Return pointer to Response model
    virtual AliITSsegmentation* GetSegmentationModel(){return fSegmentation;}
    // set pointer to Response model
    virtual void SetSegmentationModel(AliITSsegmentation *seg){
	fSegmentation = seg;}

 protected:
    AliITSresponse      *fResponse;       //! response
    AliITSsegmentation  *fSegmentation;   //! segmentation 
    AliITSpList         *fpList;          //!
    Int_t                fModule;         //!
    Int_t                fEvent;          //!

  ClassDef(AliITSsimulation,1)  // Simulation base class 
    
};

#endif