[u/mrichter/AliRoot.git] / PHOS / AliPHOSSDigitizer.cxx

/**************************************************************************
 * 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.                  *
 **************************************************************************/

/* $Id$ */

//_________________________________________________________________________
// This is a TTask that makes SDigits out of Hits
// A Summable Digits is the sum of all hits originating 
// from one primary in one active cell
// A threshold for assignment of the primary to SDigit is applied 
// SDigits are written to TreeS, branch "PHOS"
// AliPHOSSDigitizer with all current parameters is written 
// to TreeS branch "AliPHOSSDigitizer".
// Both branches have the same title. If necessary one can produce 
// another set of SDigits with different parameters. Two versions
// can be distunguished using titles of the branches.
// User case:
//  root [0] AliPHOSSDigitizer * s = new AliPHOSSDigitizer("galice.root")
//  Warning in <TDatabasePDG::TDatabasePDG>: object already instantiated
//  root [1] s->ExecuteTask()
//             // Makes SDigitis for all events stored in galice.root
//  root [2] s->SetPedestalParameter(0.001)
//             // One can change parameters of digitization
// root [3] s->SetSDigitsBranch("Pedestal 0.001")
//             // and write them into the new branch
// root [4] s->ExecuteTask("deb all tim")
//             // available parameters:
//             deb - print # of produced SDigitis
//             deb all  - print # and list of produced SDigits
//             tim - print benchmarking information
//
//*-- Author :  Dmitri Peressounko (SUBATECH & KI) 
//////////////////////////////////////////////////////////////////////////////


// --- ROOT system ---
#include "TFile.h"
#include "TTask.h"
#include "TTree.h"
#include "TSystem.h"
#include "TROOT.h"
#include "TFolder.h"
#include "TBenchmark.h"
// --- Standard library ---
#include <iomanip.h>

// --- AliRoot header files ---
#include "AliRun.h"
#include "AliPHOSDigit.h"
#include "AliPHOSHit.h"
#include "AliPHOSSDigitizer.h"


ClassImp(AliPHOSSDigitizer)

           
//____________________________________________________________________________ 
  AliPHOSSDigitizer::AliPHOSSDigitizer():TTask("AliPHOSSDigitizer","") 
{
  // ctor
  fA = 0;
  fB = 10000000. ;
  fPrimThreshold = 0.01 ;
  fNevents = 0 ;     
  fSDigits = 0 ;
  fHits = 0 ;
  fIsInitialized = kFALSE ;

}

//____________________________________________________________________________ 
AliPHOSSDigitizer::AliPHOSSDigitizer(const char* headerFile, const char *sDigitsTitle):TTask("AliPHOSSDigitizer","")
{
  // ctor
  fA = 0;
  fB = 10000000.;
  fPrimThreshold = 0.01 ;
  fNevents = 0 ;      
  fSDigitsTitle = sDigitsTitle ;
  fHeadersFile = headerFile ;
  fSDigits = new TClonesArray("AliPHOSDigit",1000);
  fHits    = new TClonesArray("AliPHOSHit",1000);

  TFile * file = (TFile*) gROOT->GetFile(fHeadersFile.Data() ) ;
  
  //File was not opened yet
  if(file == 0){
    if(fHeadersFile.Contains("rfio"))
      file =	TFile::Open(fHeadersFile,"update") ;
    else
      file = new TFile(fHeadersFile.Data(),"update") ;
    gAlice = (AliRun *) file->Get("gAlice") ;
  }
  
  //add Task to //root/Tasks folder
  TTask * roottasks = (TTask*)gROOT->GetRootFolder()->FindObject("Tasks") ; 
  TTask * phostasks = (TTask*)(roottasks->GetListOfTasks()->FindObject("PHOS"));
  phostasks->Add(this) ; 
  
  fIsInitialized = kTRUE ;
}

//____________________________________________________________________________ 
AliPHOSSDigitizer::~AliPHOSSDigitizer()
{
  // dtor
  if(fSDigits)
    delete fSDigits ;
  if(fHits)
    delete fHits ;
}
//____________________________________________________________________________ 
void AliPHOSSDigitizer::Init()
{
  // Initialization can not be done in the default constructor

  if(!fIsInitialized){

    if(fHeadersFile.IsNull())
      fHeadersFile="galice.root" ;

    TFile * file = (TFile*) gROOT->GetFile(fHeadersFile.Data() ) ;
    
    //if file was not opened yet, read gAlice
    if(file == 0){
      file = new TFile(fHeadersFile.Data(),"update") ;
      gAlice = (AliRun *) file->Get("gAlice") ;
    }
    
    fHits    = new TClonesArray("AliPHOSHit",1000);
    fSDigits = new TClonesArray("AliPHOSDigit",1000);
    
    // add Task to //root/Tasks folder
    TTask * roottasks = (TTask*)gROOT->GetRootFolder()->FindObject("Tasks") ; 
    TTask * phostasks = (TTask*)(roottasks->GetListOfTasks()->FindObject("PHOS"));
    phostasks->Add(this) ; 
    
    fIsInitialized = kTRUE ;
  }
}
//____________________________________________________________________________
void AliPHOSSDigitizer::Exec(Option_t *option) 
{ 
  // Collects all hits in the same active volume into digit
  
  if(!fIsInitialized)
    Init() ;

  if(strstr(option,"tim"))
    gBenchmark->Start("PHOSSDigitizer");
  
  fNevents = (Int_t) gAlice->TreeE()->GetEntries() ; 
  
  Int_t ievent ;
  for(ievent = 0; ievent < fNevents; ievent++){
    gAlice->GetEvent(ievent) ;
    gAlice->SetEvent(ievent) ;
    
    if(gAlice->TreeH()==0){
      cout << "AliPHOSSDigitizer: There is no Hit Tree" << endl;
      return ;
    }
    
    //set address of the hits 
    TBranch * branch = gAlice->TreeH()->GetBranch("PHOS");
    if (branch) 
      branch->SetAddress(&fHits);
    else{
      cout << "ERROR in AliPHOSSDigitizer: "<< endl ;
      cout << "      no branch PHOS in TreeH"<< endl ;
      cout << "      do nothing " << endl ;
      return ;
    }
    
    fSDigits->Clear();
    Int_t nSdigits = 0 ;
    
    
    //Now made SDigits from hits, for PHOS it is the same, so just copy    
    Int_t itrack ;
    for (itrack=0; itrack < gAlice->GetNtrack(); itrack++){
      
      //=========== Get the PHOS branch from Hits Tree for the Primary track itrack
      branch->GetEntry(itrack,0);
      
      Int_t i;
      for ( i = 0 ; i < fHits->GetEntries() ; i++ ) {
	AliPHOSHit * hit = (AliPHOSHit*)fHits->At(i) ;

	// Assign primary number only if contribution is significant
	if( hit->GetEnergy() > fPrimThreshold)
	  new((*fSDigits)[nSdigits]) AliPHOSDigit( hit->GetPrimary(), hit->GetId(), Digitize( hit->GetEnergy() ) ) ;
	else
	  new((*fSDigits)[nSdigits]) AliPHOSDigit( -1               , hit->GetId(), Digitize( hit->GetEnergy() ) ) ;
	
	nSdigits++ ;  
	
      } 
      
    } // loop over tracks
    
    fSDigits->Sort() ;
    
    nSdigits = fSDigits->GetEntriesFast() ;
    fSDigits->Expand(nSdigits) ;
    
    Int_t i ;
    for (i = 0 ; i < nSdigits ; i++) { 
      AliPHOSDigit * digit = (AliPHOSDigit *) fSDigits->At(i) ; 
      digit->SetIndexInList(i) ;     
    }

    if(gAlice->TreeS() == 0)
      gAlice->MakeTree("S") ;
    
    //check, if this branch already exits?
    TBranch * sdigitsBranch = 0;
    TBranch * sdigitizerBranch = 0;
    
    TObjArray * branches = gAlice->TreeS()->GetListOfBranches() ;
    Int_t ibranch;
    Bool_t phosNotFound = kTRUE ;
    Bool_t sdigitizerNotFound = kTRUE ;
    
    for(ibranch = 0;ibranch <branches->GetEntries();ibranch++){
      
      if(phosNotFound){
	sdigitsBranch=(TBranch *) branches->At(ibranch) ;
	if( (strcmp("PHOS",sdigitsBranch->GetName())==0 ) &&
	    (fSDigitsTitle.CompareTo(sdigitsBranch->GetTitle()) == 0) )
	  phosNotFound = kFALSE ;
      }
      if(sdigitizerNotFound){
	sdigitizerBranch = (TBranch *) branches->At(ibranch) ;
	if( (strcmp(sdigitizerBranch->GetName(),"AliPHOSSDigitizer") == 0)&&
	    (fSDigitsTitle.CompareTo(sdigitizerBranch->GetTitle()) == 0) )
	  sdigitizerNotFound = kFALSE ;
      }
    }

    if(!(sdigitizerNotFound && phosNotFound)){
      cout << "AliPHOSSdigitizer error:" << endl ;
      cout << "Can not overwrite existing branches: do not write" << endl ;
      return ;
    }
    
    //Make (if necessary) branches    
    char * file =0;
    if(gSystem->Getenv("CONFIG_SPLIT_FILE")){ //generating file name
      file = new char[strlen(gAlice->GetBaseFile())+20] ;
      sprintf(file,"%s/PHOS.SDigits.root",gAlice->GetBaseFile()) ;
    }
    
    TDirectory *cwd = gDirectory;
    
    //First list of sdigits
    Int_t bufferSize = 32000 ;    
    sdigitsBranch = gAlice->TreeS()->Branch("PHOS",&fSDigits,bufferSize);
    sdigitsBranch->SetTitle(fSDigitsTitle.Data());
    if (file) {
      sdigitsBranch->SetFile(file);
      TIter next( sdigitsBranch->GetListOfBranches());
      TBranch * subbr;
      while ((subbr=(TBranch*)next())) {
	subbr->SetFile(file);
      }   
      cwd->cd();
    } 
      
    //second - SDigitizer
    Int_t splitlevel = 0 ;
    AliPHOSSDigitizer * sd = this ;
    sdigitizerBranch = gAlice->TreeS()->Branch("AliPHOSSDigitizer","AliPHOSSDigitizer",
					       &sd,bufferSize,splitlevel); 
    sdigitizerBranch->SetTitle(fSDigitsTitle.Data());
    if (file) {
      sdigitizerBranch->SetFile(file);
      TIter next( sdigitizerBranch->GetListOfBranches());
      TBranch * subbr ;
      while ((subbr=(TBranch*)next())) {
	subbr->SetFile(file);
      }   
      cwd->cd();
      delete file;
    }

    sdigitsBranch->Fill() ;
    sdigitizerBranch->Fill() ;
    gAlice->TreeS()->Write(0,TObject::kOverwrite) ;
    
    if(strstr(option,"deb"))
      PrintSDigits(option) ;
    
  }
  
  if(strstr(option,"tim")){
    gBenchmark->Stop("PHOSSDigitizer");
    cout << "AliPHOSSDigitizer:" << endl ;
    cout << "   took " << gBenchmark->GetCpuTime("PHOSSDigitizer") << " seconds for SDigitizing " 
	 <<  gBenchmark->GetCpuTime("PHOSSDigitizer")/fNevents << " seconds per event " << endl ;
    cout << endl ;
  }
  
  
}
//__________________________________________________________________
void AliPHOSSDigitizer::SetSDigitsBranch(const char * title )
{
  // Setting title to branch SDigits 
  if(!fSDigitsTitle.IsNull())
    cout << "AliPHOSSdigitizer: changing SDigits file from " <<fSDigitsTitle.Data() << " to " << title << endl ;
  fSDigitsTitle=title ;
}
//__________________________________________________________________
void AliPHOSSDigitizer::Print(Option_t* option)const
{
  // Prints parameters of SDigitizer
  cout << "------------------- "<< GetName() << " -------------" << endl ;
  cout << "   Writing SDigitis to branch with title  " << fSDigitsTitle.Data() << endl ;
  cout << "   with digitization parameters  A = " << fA << endl ;
  cout << "                                 B = " << fB << endl ;
  cout << "   Threshold for Primary assignment= " << fPrimThreshold << endl ; 
  cout << "---------------------------------------------------"<<endl ;
  
}
//__________________________________________________________________
Bool_t AliPHOSSDigitizer::operator==( AliPHOSSDigitizer const &sd )const
{
  // Equal operator.
  // SDititizers are equal if their pedestal, slope and threshold are equal

  if( (fA==sd.fA)&&(fB==sd.fB)&&(fPrimThreshold==sd.fPrimThreshold))
    return kTRUE ;
  else
    return kFALSE ;
}
//__________________________________________________________________
void AliPHOSSDigitizer::PrintSDigits(Option_t * option)
{
  // Prints list of digits produced in the current pass of AliPHOSDigitizer
  
  cout << "AliPHOSSDigitizer: " << endl ;
  cout << "       Number of entries in SDigits list  " << fSDigits->GetEntriesFast() << endl ;
  cout << endl ;
  
  if(strstr(option,"all")){// print all digits
    
    //loop over digits
    AliPHOSDigit * digit;
    cout << "SDigit Id " << " Amplitude " <<  " Index "  <<  " Nprim " << " Primaries list " <<  endl;    
    Int_t index ;
    for (index = 0 ; index < fSDigits->GetEntries() ; index++) {
      digit = (AliPHOSDigit * )  fSDigits->At(index) ;
      cout << setw(8)  <<  digit->GetId() << " "  << 	setw(3)  <<  digit->GetAmp() <<   "  "  
	   << setw(6)  <<  digit->GetIndexInList() << "  "   
	   << setw(5)  <<  digit->GetNprimary() <<"  ";
      
      Int_t iprimary;
      for (iprimary=0; iprimary<digit->GetNprimary(); iprimary++)
	cout << setw(5)  <<  digit->GetPrimary(iprimary+1) << "  ";
      cout << endl;  	 
    }
    
  }
}
Commit	Line	Data
	1	/**************************************************************************
	2	* Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
	3	* *
	4	* Author: The ALICE Off-line Project. *
	5	* Contributors are mentioned in the code where appropriate. *
	6	* *
	7	* Permission to use, copy, modify and distribute this software and its *
	8	* documentation strictly for non-commercial purposes is hereby granted *
	9	* without fee, provided that the above copyright notice appears in all *
	10	* copies and that both the copyright notice and this permission notice *
	11	* appear in the supporting documentation. The authors make no claims *
	12	* about the suitability of this software for any purpose. It is *
	13	* provided "as is" without express or implied warranty. *
	14	**************************************************************************/
	15
	16	/* $Id$ */
	17
	18	//_________________________________________________________________________
	19	// This is a TTask that makes SDigits out of Hits
	20	// A Summable Digits is the sum of all hits originating
	21	// from one primary in one active cell
	22	// A threshold for assignment of the primary to SDigit is applied
	23	// SDigits are written to TreeS, branch "PHOS"
	24	// AliPHOSSDigitizer with all current parameters is written
	25	// to TreeS branch "AliPHOSSDigitizer".
	26	// Both branches have the same title. If necessary one can produce
	27	// another set of SDigits with different parameters. Two versions
	28	// can be distunguished using titles of the branches.
	29	// User case:
	30	// root [0] AliPHOSSDigitizer * s = new AliPHOSSDigitizer("galice.root")
	31	// Warning in <TDatabasePDG::TDatabasePDG>: object already instantiated
	32	// root [1] s->ExecuteTask()
	33	// // Makes SDigitis for all events stored in galice.root
	34	// root [2] s->SetPedestalParameter(0.001)
	35	// // One can change parameters of digitization
	36	// root [3] s->SetSDigitsBranch("Pedestal 0.001")
	37	// // and write them into the new branch
	38	// root [4] s->ExecuteTask("deb all tim")
	39	// // available parameters:
	40	// deb - print # of produced SDigitis
	41	// deb all - print # and list of produced SDigits
	42	// tim - print benchmarking information
	43	//
	44	//*-- Author : Dmitri Peressounko (SUBATECH & KI)
	45	//////////////////////////////////////////////////////////////////////////////
	46
	47
	48	// --- ROOT system ---
	49	#include "TFile.h"
	50	#include "TTask.h"
	51	#include "TTree.h"
	52	#include "TSystem.h"
	53	#include "TROOT.h"
	54	#include "TFolder.h"
	55	#include "TBenchmark.h"
	56	// --- Standard library ---
	57	#include <iomanip.h>
	58
	59	// --- AliRoot header files ---
	60	#include "AliRun.h"
	61	#include "AliPHOSDigit.h"
	62	#include "AliPHOSHit.h"
	63	#include "AliPHOSSDigitizer.h"
	64
	65
	66	ClassImp(AliPHOSSDigitizer)
	67
	68
	69	//____________________________________________________________________________
	70	AliPHOSSDigitizer::AliPHOSSDigitizer():TTask("AliPHOSSDigitizer","")
	71	{
	72	// ctor
	73	fA = 0;
	74	fB = 10000000. ;
	75	fPrimThreshold = 0.01 ;
	76	fNevents = 0 ;
	77	fSDigits = 0 ;
	78	fHits = 0 ;
	79	fIsInitialized = kFALSE ;
	80
	81	}
	82
	83	//____________________________________________________________________________
	84	AliPHOSSDigitizer::AliPHOSSDigitizer(const char* headerFile, const char *sDigitsTitle):TTask("AliPHOSSDigitizer","")
	85	{
	86	// ctor
	87	fA = 0;
	88	fB = 10000000.;
	89	fPrimThreshold = 0.01 ;
	90	fNevents = 0 ;
	91	fSDigitsTitle = sDigitsTitle ;
	92	fHeadersFile = headerFile ;
	93	fSDigits = new TClonesArray("AliPHOSDigit",1000);
	94	fHits = new TClonesArray("AliPHOSHit",1000);
	95
	96	TFile * file = (TFile*) gROOT->GetFile(fHeadersFile.Data() ) ;
	97
	98	//File was not opened yet
	99	if(file == 0){
	100	if(fHeadersFile.Contains("rfio"))
	101	file = TFile::Open(fHeadersFile,"update") ;
	102	else
	103	file = new TFile(fHeadersFile.Data(),"update") ;
	104	gAlice = (AliRun *) file->Get("gAlice") ;
	105	}
	106
	107	//add Task to //root/Tasks folder
	108	TTask * roottasks = (TTask*)gROOT->GetRootFolder()->FindObject("Tasks") ;
	109	TTask * phostasks = (TTask*)(roottasks->GetListOfTasks()->FindObject("PHOS"));
	110	phostasks->Add(this) ;
	111
	112	fIsInitialized = kTRUE ;
	113	}
	114
	115	//____________________________________________________________________________
	116	AliPHOSSDigitizer::~AliPHOSSDigitizer()
	117	{
	118	// dtor
	119	if(fSDigits)
	120	delete fSDigits ;
	121	if(fHits)
	122	delete fHits ;
	123	}
	124	//____________________________________________________________________________
	125	void AliPHOSSDigitizer::Init()
	126	{
	127	// Initialization can not be done in the default constructor
	128
	129	if(!fIsInitialized){
	130
	131	if(fHeadersFile.IsNull())
	132	fHeadersFile="galice.root" ;
	133
	134	TFile * file = (TFile*) gROOT->GetFile(fHeadersFile.Data() ) ;
	135
	136	//if file was not opened yet, read gAlice
	137	if(file == 0){
	138	file = new TFile(fHeadersFile.Data(),"update") ;
	139	gAlice = (AliRun *) file->Get("gAlice") ;
	140	}
	141
	142	fHits = new TClonesArray("AliPHOSHit",1000);
	143	fSDigits = new TClonesArray("AliPHOSDigit",1000);
	144
	145	// add Task to //root/Tasks folder
	146	TTask * roottasks = (TTask*)gROOT->GetRootFolder()->FindObject("Tasks") ;
	147	TTask * phostasks = (TTask*)(roottasks->GetListOfTasks()->FindObject("PHOS"));
	148	phostasks->Add(this) ;
	149
	150	fIsInitialized = kTRUE ;
	151	}
	152	}
	153	//____________________________________________________________________________
	154	void AliPHOSSDigitizer::Exec(Option_t *option)
	155	{
	156	// Collects all hits in the same active volume into digit
	157
	158	if(!fIsInitialized)
	159	Init() ;
	160
	161	if(strstr(option,"tim"))
	162	gBenchmark->Start("PHOSSDigitizer");
	163
	164	fNevents = (Int_t) gAlice->TreeE()->GetEntries() ;
	165
	166	Int_t ievent ;
	167	for(ievent = 0; ievent < fNevents; ievent++){
	168	gAlice->GetEvent(ievent) ;
	169	gAlice->SetEvent(ievent) ;
	170
	171	if(gAlice->TreeH()==0){
	172	cout << "AliPHOSSDigitizer: There is no Hit Tree" << endl;
	173	return ;
	174	}
	175
	176	//set address of the hits
	177	TBranch * branch = gAlice->TreeH()->GetBranch("PHOS");
	178	if (branch)
	179	branch->SetAddress(&fHits);
	180	else{
	181	cout << "ERROR in AliPHOSSDigitizer: "<< endl ;
	182	cout << " no branch PHOS in TreeH"<< endl ;
	183	cout << " do nothing " << endl ;
	184	return ;
	185	}
	186
	187	fSDigits->Clear();
	188	Int_t nSdigits = 0 ;
	189
	190
	191	//Now made SDigits from hits, for PHOS it is the same, so just copy
	192	Int_t itrack ;
	193	for (itrack=0; itrack < gAlice->GetNtrack(); itrack++){
	194
	195	//=========== Get the PHOS branch from Hits Tree for the Primary track itrack
	196	branch->GetEntry(itrack,0);
	197
	198	Int_t i;
	199	for ( i = 0 ; i < fHits->GetEntries() ; i++ ) {
	200	AliPHOSHit * hit = (AliPHOSHit*)fHits->At(i) ;
	201
	202	// Assign primary number only if contribution is significant
	203	if( hit->GetEnergy() > fPrimThreshold)
	204	new((*fSDigits)[nSdigits]) AliPHOSDigit( hit->GetPrimary(), hit->GetId(), Digitize( hit->GetEnergy() ) ) ;
	205	else
	206	new((*fSDigits)[nSdigits]) AliPHOSDigit( -1 , hit->GetId(), Digitize( hit->GetEnergy() ) ) ;
	207
	208	nSdigits++ ;
	209
	210	}
	211
	212	} // loop over tracks
	213
	214	fSDigits->Sort() ;
	215
	216	nSdigits = fSDigits->GetEntriesFast() ;
	217	fSDigits->Expand(nSdigits) ;
	218
	219	Int_t i ;
	220	for (i = 0 ; i < nSdigits ; i++) {
	221	AliPHOSDigit * digit = (AliPHOSDigit *) fSDigits->At(i) ;
	222	digit->SetIndexInList(i) ;
	223	}
	224
	225	if(gAlice->TreeS() == 0)
	226	gAlice->MakeTree("S") ;
	227
	228	//check, if this branch already exits?
	229	TBranch * sdigitsBranch = 0;
	230	TBranch * sdigitizerBranch = 0;
	231
	232	TObjArray * branches = gAlice->TreeS()->GetListOfBranches() ;
	233	Int_t ibranch;
	234	Bool_t phosNotFound = kTRUE ;
	235	Bool_t sdigitizerNotFound = kTRUE ;
	236
	237	for(ibranch = 0;ibranch <branches->GetEntries();ibranch++){
	238
	239	if(phosNotFound){
	240	sdigitsBranch=(TBranch *) branches->At(ibranch) ;
	241	if( (strcmp("PHOS",sdigitsBranch->GetName())==0 ) &&
	242	(fSDigitsTitle.CompareTo(sdigitsBranch->GetTitle()) == 0) )
	243	phosNotFound = kFALSE ;
	244	}
	245	if(sdigitizerNotFound){
	246	sdigitizerBranch = (TBranch *) branches->At(ibranch) ;
	247	if( (strcmp(sdigitizerBranch->GetName(),"AliPHOSSDigitizer") == 0)&&
	248	(fSDigitsTitle.CompareTo(sdigitizerBranch->GetTitle()) == 0) )
	249	sdigitizerNotFound = kFALSE ;
	250	}
	251	}
	252
	253	if(!(sdigitizerNotFound && phosNotFound)){
	254	cout << "AliPHOSSdigitizer error:" << endl ;
	255	cout << "Can not overwrite existing branches: do not write" << endl ;
	256	return ;
	257	}
	258
	259	//Make (if necessary) branches
	260	char * file =0;
	261	if(gSystem->Getenv("CONFIG_SPLIT_FILE")){ //generating file name
	262	file = new char[strlen(gAlice->GetBaseFile())+20] ;
	263	sprintf(file,"%s/PHOS.SDigits.root",gAlice->GetBaseFile()) ;
	264	}
	265
	266	TDirectory *cwd = gDirectory;
	267
	268	//First list of sdigits
	269	Int_t bufferSize = 32000 ;
	270	sdigitsBranch = gAlice->TreeS()->Branch("PHOS",&fSDigits,bufferSize);
	271	sdigitsBranch->SetTitle(fSDigitsTitle.Data());
	272	if (file) {
	273	sdigitsBranch->SetFile(file);
	274	TIter next( sdigitsBranch->GetListOfBranches());
	275	TBranch * subbr;
	276	while ((subbr=(TBranch*)next())) {
	277	subbr->SetFile(file);
	278	}
	279	cwd->cd();
	280	}
	281
	282	//second - SDigitizer
	283	Int_t splitlevel = 0 ;
	284	AliPHOSSDigitizer * sd = this ;
	285	sdigitizerBranch = gAlice->TreeS()->Branch("AliPHOSSDigitizer","AliPHOSSDigitizer",
	286	&sd,bufferSize,splitlevel);
	287	sdigitizerBranch->SetTitle(fSDigitsTitle.Data());
	288	if (file) {
	289	sdigitizerBranch->SetFile(file);
	290	TIter next( sdigitizerBranch->GetListOfBranches());
	291	TBranch * subbr ;
	292	while ((subbr=(TBranch*)next())) {
	293	subbr->SetFile(file);
	294	}
	295	cwd->cd();
	296	delete file;
	297	}
	298
	299	sdigitsBranch->Fill() ;
	300	sdigitizerBranch->Fill() ;
	301	gAlice->TreeS()->Write(0,TObject::kOverwrite) ;
	302
	303	if(strstr(option,"deb"))
	304	PrintSDigits(option) ;
	305
	306	}
	307
	308	if(strstr(option,"tim")){
	309	gBenchmark->Stop("PHOSSDigitizer");
	310	cout << "AliPHOSSDigitizer:" << endl ;
	311	cout << " took " << gBenchmark->GetCpuTime("PHOSSDigitizer") << " seconds for SDigitizing "
	312	<< gBenchmark->GetCpuTime("PHOSSDigitizer")/fNevents << " seconds per event " << endl ;
	313	cout << endl ;
	314	}
	315
	316
	317	}
	318	//__________________________________________________________________
	319	void AliPHOSSDigitizer::SetSDigitsBranch(const char * title )
	320	{
	321	// Setting title to branch SDigits
	322	if(!fSDigitsTitle.IsNull())
	323	cout << "AliPHOSSdigitizer: changing SDigits file from " <<fSDigitsTitle.Data() << " to " << title << endl ;
	324	fSDigitsTitle=title ;
	325	}
	326	//__________________________________________________________________
	327	void AliPHOSSDigitizer::Print(Option_t* option)const
	328	{
	329	// Prints parameters of SDigitizer
	330	cout << "------------------- "<< GetName() << " -------------" << endl ;
	331	cout << " Writing SDigitis to branch with title " << fSDigitsTitle.Data() << endl ;
	332	cout << " with digitization parameters A = " << fA << endl ;
	333	cout << " B = " << fB << endl ;
	334	cout << " Threshold for Primary assignment= " << fPrimThreshold << endl ;
	335	cout << "---------------------------------------------------"<<endl ;
	336
	337	}
	338	//__________________________________________________________________
	339	Bool_t AliPHOSSDigitizer::operator==( AliPHOSSDigitizer const &sd )const
	340	{
	341	// Equal operator.
	342	// SDititizers are equal if their pedestal, slope and threshold are equal
	343
	344	if( (fA==sd.fA)&&(fB==sd.fB)&&(fPrimThreshold==sd.fPrimThreshold))
	345	return kTRUE ;
	346	else
	347	return kFALSE ;
	348	}
	349	//__________________________________________________________________
	350	void AliPHOSSDigitizer::PrintSDigits(Option_t * option)
	351	{
	352	// Prints list of digits produced in the current pass of AliPHOSDigitizer
	353
	354	cout << "AliPHOSSDigitizer: " << endl ;
	355	cout << " Number of entries in SDigits list " << fSDigits->GetEntriesFast() << endl ;
	356	cout << endl ;
	357
	358	if(strstr(option,"all")){// print all digits
	359
	360	//loop over digits
	361	AliPHOSDigit * digit;
	362	cout << "SDigit Id " << " Amplitude " << " Index " << " Nprim " << " Primaries list " << endl;
	363	Int_t index ;
	364	for (index = 0 ; index < fSDigits->GetEntries() ; index++) {
	365	digit = (AliPHOSDigit * ) fSDigits->At(index) ;
	366	cout << setw(8) << digit->GetId() << " " << setw(3) << digit->GetAmp() << " "
	367	<< setw(6) << digit->GetIndexInList() << " "
	368	<< setw(5) << digit->GetNprimary() <<" ";
	369
	370	Int_t iprimary;
	371	for (iprimary=0; iprimary<digit->GetNprimary(); iprimary++)
	372	cout << setw(5) << digit->GetPrimary(iprimary+1) << " ";
	373	cout << endl;
	374	}
	375
	376	}
	377	}