Misalignment according survey data

[u/mrichter/AliRoot.git] / STEER / AliModule.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.                  *
 **************************************************************************/

/* $Id$ */

///////////////////////////////////////////////////////////////////////////////
//                                                                           //
// Base class for ALICE modules. Both sensitive modules (Modules) and      //
// non-sensitive ones are described by this base class. This class           //
// supports the hit and digit trees produced by the simulation and also      //
// the objects produced by the reconstruction.                               //
//                                                                           //
// This class is also responsible for building the geometry of the           //
// Modules.                                                                //
//                                                                           //
//Begin_Html
/*
<img src="picts/AliModuleClass.gif">
*/
//End_Html
//                                                                           //
///////////////////////////////////////////////////////////////////////////////

#include <TNode.h>
#include <TObjArray.h>
#include <TClonesArray.h>
#include <TTree.h>
#include <TSystem.h>
#include <TDirectory.h>
#include <TVirtualMC.h>
#include <TGeoManager.h>
#include <TString.h>

#include "AliLog.h"
#include "AliConfig.h"
#include "AliLoader.h"
#include "AliMagF.h"
#include "AliModule.h"
#include "AliRun.h"
#include "AliTrackReference.h"
#include "AliMC.h"
#include "AliRawDataHeader.h"

#include "AliDAQ.h"

ClassImp(AliModule)
 
//_______________________________________________________________________
AliModule::AliModule():
  fEuclidMaterial(""),
  fEuclidGeometry(""),
  fIdtmed(0),
  fIdmate(0),
  fLoMedium(0),
  fHiMedium(0),
  fActive(0),
  fHistograms(0),
  fNodes(0),
  fEnable(1),
  fTrackReferences(0),
  fMaxIterTrackRef(0),
  fCurrentIterTrackRef(0),
  fRunLoader(0)
{
  //
  // Default constructor for the AliModule class
  //
}
 
//_______________________________________________________________________
AliModule::AliModule(const char* name,const char *title):
  TNamed(name,title),
  fEuclidMaterial(""),
  fEuclidGeometry(""),
  fIdtmed(new TArrayI(100)),
  fIdmate(new TArrayI(100)),
  fLoMedium(65536),
  fHiMedium(0),
  fActive(0),
  fHistograms(new TList()),
  fNodes(new TList()),
  fEnable(1),
  fTrackReferences(new TClonesArray("AliTrackReference", 100)),
  fMaxIterTrackRef(0),
  fCurrentIterTrackRef(0),
  fRunLoader(0)
{
  //
  // Normal constructor invoked by all Modules.
  // Create the list for Module specific histograms
  // Add this Module to the global list of Modules in Run.
  //
  // Get the Module numeric ID

  Int_t id = gAlice->GetModuleID(name);
  if (id>=0) {
    // Module already added !
     AliWarning(Form("Module: %s already present at %d",name,id));
     return;
  }
  //
  // Add this Module to the list of Modules

  gAlice->AddModule(this);

  //PH  SetMarkerColor(3);
  //
  // Clear space for tracking media and material indexes

  for(Int_t i=0;i<100;i++) (*fIdmate)[i]=(*fIdtmed)[i]=0;
}
 
//_______________________________________________________________________
AliModule::~AliModule()
{
  //
  // Destructor
  //

  // Remove this Module from the list of Modules
  if (gAlice) {
    TObjArray * modules = gAlice->Modules();
    if (modules) modules->Remove(this);
  }
  // Delete ROOT geometry
  if(fNodes) {
    fNodes->Clear();
    delete fNodes;
    fNodes = 0;
  }
  // Delete histograms
  if(fHistograms) {
    fHistograms->Clear();
    delete fHistograms;
    fHistograms = 0;
  }
  // Delete track references
  if (fTrackReferences) {
    fTrackReferences->Delete();
    delete fTrackReferences;
    fTrackReferences     = 0;
  }
  // Delete TArray objects
  delete fIdtmed;
  delete fIdmate;

}
 
//_______________________________________________________________________
void AliModule::Disable()
{
  //
  // Disable Module on viewer
  //
  fActive = kFALSE;
  TIter next(fNodes);
  TNode *node;
  //
  // Loop through geometry to disable all
  // nodes for this Module
  while((node = dynamic_cast<TNode*>(next()))) {
    node->SetVisibility(-1);
  }   
}

//_______________________________________________________________________
void AliModule::Enable()
{
  //
  // Enable Module on the viewver
  //
  fActive = kTRUE;
  TIter next(fNodes);
  TNode *node;
  //
  // Loop through geometry to enable all
  // nodes for this Module
  while((node = dynamic_cast<TNode*>(next()))) {
    node->SetVisibility(3);
  }   
}

//_______________________________________________________________________
void AliModule::AliMaterial(Int_t imat, const char* name, Float_t a, 
                            Float_t z, Float_t dens, Float_t radl,
                            Float_t absl, Float_t *buf, Int_t nwbuf) const
{
  //
  // Store the parameters for a material
  //
  // imat        the material index will be stored in (*fIdmate)[imat]
  // name        material name
  // a           atomic mass
  // z           atomic number
  // dens        density
  // radl        radiation length
  // absl        absorbtion length
  // buf         adress of an array user words
  // nwbuf       number of user words
  //
  Int_t kmat;
  //Build the string uniquename as "DET_materialname"
  TString uniquename = GetName();
  uniquename.Append("_");
  uniquename.Append(name);
  //if geometry loaded from file only fill fIdmate, else create material too
  if(gAlice->IsRootGeometry()){
    TGeoMaterial *mat = gGeoManager->GetMaterial(uniquename.Data());
    kmat = mat->GetUniqueID();
    (*fIdmate)[imat]=kmat;
  }else{
    gMC->Material(kmat, uniquename.Data(), a, z, dens, radl, absl, buf, nwbuf);
    (*fIdmate)[imat]=kmat;
  }
}
  
//_______________________________________________________________________
void AliModule::AliGetMaterial(Int_t imat, char* name, Float_t &a, 
                               Float_t &z, Float_t &dens, Float_t &radl,
                               Float_t &absl) const
{
  //
  // Store the parameters for a material
  //
  // imat        the material index will be stored in (*fIdmate)[imat]
  // name        material name
  // a           atomic mass
  // z           atomic number
  // dens        density
  // radl        radiation length
  // absl        absorbtion length
  // buf         adress of an array user words
  // nwbuf       number of user words
  //

  Float_t buf[10];
  Int_t nwbuf, kmat;
  kmat=(*fIdmate)[imat];
  gMC->Gfmate(kmat, name, a, z, dens, radl, absl, buf, nwbuf);
}
  

//_______________________________________________________________________
void AliModule::AliMixture(Int_t imat, const char *name, Float_t *a,
                           Float_t *z, Float_t dens, Int_t nlmat,
                           Float_t *wmat) const
{ 
  //
  // Defines mixture or compound imat as composed by 
  // nlmat materials defined by arrays a, z and wmat
  // 
  // If nlmat > 0 wmat contains the proportion by
  // weights of each basic material in the mixture  
  // 
  // If nlmat < 0 wmat contains the number of atoms 
  // of eack kind in the molecule of the compound
  // In this case, wmat is changed on output to the relative weigths.
  //
  // imat        the material index will be stored in (*fIdmate)[imat]
  // name        material name
  // a           array of atomic masses
  // z           array of atomic numbers
  // dens        density
  // nlmat       number of components
  // wmat        array of concentrations
  //
  Int_t kmat;
  //Build the string uniquename as "DET_mixturename"
  TString uniquename = GetName();
  uniquename.Append("_");
  uniquename.Append(name);
  //if geometry loaded from file only fill fIdmate, else create mixture too
  if(gAlice->IsRootGeometry()){
    TGeoMaterial *mat = gGeoManager->GetMaterial(uniquename.Data());
    kmat = mat->GetUniqueID();
    (*fIdmate)[imat]=kmat;
  }else{
    gMC->Mixture(kmat, uniquename.Data(), a, z, dens, nlmat, wmat);
    (*fIdmate)[imat]=kmat;
  }
} 
 
//_______________________________________________________________________
void AliModule::AliMedium(Int_t numed, const char *name, Int_t nmat,
                          Int_t isvol, Int_t ifield, Float_t fieldm,
                          Float_t tmaxfd, Float_t stemax, Float_t deemax,
                          Float_t epsil, Float_t stmin, Float_t *ubuf,
                          Int_t nbuf) const
{ 
  //
  // Store the parameters of a tracking medium
  //
  // numed       the medium number is stored into (*fIdtmed)[numed]
  // name        medium name
  // nmat        the material number is stored into (*fIdmate)[nmat]
  // isvol       sensitive volume if isvol!=0
  // ifield      magnetic field flag (see below)
  // fieldm      maximum magnetic field
  // tmaxfd      maximum deflection angle due to magnetic field
  // stemax      maximum step allowed
  // deemax      maximum fractional energy loss in one step
  // epsil       tracking precision in cm
  // stmin       minimum step due to continuous processes
  //
  // ifield =  0       no magnetic field
  //        = -1       user decision in guswim
  //        =  1       tracking performed with Runge Kutta
  //        =  2       tracking performed with helix
  //        =  3       constant magnetic field along z
  //  
  Int_t kmed;
  //Build the string uniquename as "DET_mediumname"
  TString uniquename = GetName();
  uniquename.Append("_");
  uniquename.Append(name);
  //if geometry loaded from file only fill fIdtmed, else create medium too
  if(gAlice->IsRootGeometry()){
    TGeoMedium *med = gGeoManager->GetMedium(uniquename.Data());
    kmed = med->GetId();
    (*fIdtmed)[numed]=kmed;
  }else{
    gMC->Medium(kmed, uniquename.Data(), (*fIdmate)[nmat], isvol, ifield,
                fieldm, tmaxfd, stemax, deemax, epsil, stmin, ubuf, nbuf);
    (*fIdtmed)[numed]=kmed;
  }
} 
 
//_______________________________________________________________________
void AliModule::AliMatrix(Int_t &nmat, Float_t theta1, Float_t phi1,
                          Float_t theta2, Float_t phi2, Float_t theta3,
                          Float_t phi3) const
{
  // 
  // Define a rotation matrix. Angles are in degrees.
  //
  // nmat        on output contains the number assigned to the rotation matrix
  // theta1      polar angle for axis I
  // phi1        azimuthal angle for axis I
  // theta2      polar angle for axis II
  // phi2        azimuthal angle for axis II
  // theta3      polar angle for axis III
  // phi3        azimuthal angle for axis III
  //
  gMC->Matrix(nmat, theta1, phi1, theta2, phi2, theta3, phi3); 
} 

//_______________________________________________________________________
Float_t AliModule::ZMin() const
{
  return -500;
}

//_______________________________________________________________________
Float_t AliModule::ZMax() const
{
  return 500;
}

//_______________________________________________________________________
void AliModule::SetEuclidFile(char* material, char* geometry)
{
  //
  // Sets the name of the Euclid file
  //
  fEuclidMaterial=material;
  if(geometry) {
    fEuclidGeometry=geometry;
  } else {
    char* name = new char[strlen(material)];
    strcpy(name,material);
    strcpy(&name[strlen(name)-4],".euc");
    fEuclidGeometry=name;
    delete [] name;
  }
}
 
//_______________________________________________________________________
void AliModule::ReadEuclid(const char* filnam, char* topvol)
{
  //                                                                     
  //       read in the geometry of the detector in euclid file format    
  //                                                                     
  //        id_det : the detector identification (2=its,...)            
  //        topvol : return parameter describing the name of the top    
  //        volume of geometry.                                          
  //                                                                     
  //            author : m. maire                                        
  //                                                                     
  //     28.07.98
  //     several changes have been made by miroslav helbich
  //     subroutine is rewrited to follow the new established way of memory
  //     booking for tracking medias and rotation matrices.
  //     all used tracking media have to be defined first, for this you can use
  //     subroutine  greutmed.
  //     top volume is searched as only volume not positioned into another 
  //

  Int_t i, nvol, iret, itmed, irot, numed, npar, ndiv, iaxe;
  Int_t ndvmx, nr, flag;
  char key[5], card[77], natmed[21];
  char name[5], mother[5], shape[5], konly[5], volst[7000][5];
  char *filtmp;
  Float_t par[100];
  Float_t teta1, phi1, teta2, phi2, teta3, phi3, orig, step;
  Float_t xo, yo, zo;
  const Int_t kMaxRot=5000;
  Int_t idrot[kMaxRot],istop[7000];
  FILE *lun;
  //
  // *** The input filnam name will be with extension '.euc'
  filtmp=gSystem->ExpandPathName(filnam);
  lun=fopen(filtmp,"r");
  delete [] filtmp;
  if(!lun) {
    AliError(Form("Could not open file %s",filnam));
    return;
  }
  //* --- definition of rotation matrix 0 ---  
  TArrayI &idtmed = *fIdtmed;
  for(i=1; i<kMaxRot; ++i) idrot[i]=-99;
  idrot[0]=0;
  nvol=0;
 L10:
  for(i=0;i<77;i++) card[i]=0;
  iret=fscanf(lun,"%77[^\n]",card);
  if(iret<=0) goto L20;
  fscanf(lun,"%*c");
  //*
  strncpy(key,card,4);
  key[4]='\0';
  if (!strcmp(key,"TMED")) {
    sscanf(&card[5],"%d '%[^']'",&itmed,natmed);
    if( itmed<0 || itmed>=100 ) {
      AliError(Form("TMED illegal medium number %d for %s",itmed,natmed));
      exit(1);
    }
    //Pad the string with blanks
    i=-1;
    while(natmed[++i]);
    while(i<20) natmed[i++]=' ';
    natmed[i]='\0';
    //
    if( idtmed[itmed]<=0 ) {
      AliError(Form("TMED undefined medium number %d for %s",itmed,natmed));
      exit(1);
    }
    gMC->Gckmat(idtmed[itmed],natmed);
    //*
  } else if (!strcmp(key,"ROTM")) {
    sscanf(&card[4],"%d %f %f %f %f %f %f",&irot,&teta1,&phi1,&teta2,&phi2,&teta3,&phi3);
    if( irot<=0 || irot>=kMaxRot ) {
      AliError(Form("ROTM rotation matrix number %d illegal",irot));
      exit(1);
    }
    AliMatrix(idrot[irot],teta1,phi1,teta2,phi2,teta3,phi3);
    //*
  } else if (!strcmp(key,"VOLU")) {
    sscanf(&card[5],"'%[^']' '%[^']' %d %d", name, shape, &numed, &npar);
    if (npar>0) {
      for(i=0;i<npar;i++) fscanf(lun,"%f",&par[i]);
      fscanf(lun,"%*c");
    }
    gMC->Gsvolu( name, shape, idtmed[numed], par, npar);
    //*     save the defined volumes
    strcpy(volst[++nvol],name);
    istop[nvol]=1;
    //*
  } else if (!strcmp(key,"DIVN")) {
    sscanf(&card[5],"'%[^']' '%[^']' %d %d", name, mother, &ndiv, &iaxe);
    gMC->Gsdvn  ( name, mother, ndiv, iaxe );
    //*
  } else if (!strcmp(key,"DVN2")) {
    sscanf(&card[5],"'%[^']' '%[^']' %d %d %f %d",name, mother, &ndiv, &iaxe, &orig, &numed);
    gMC->Gsdvn2( name, mother, ndiv, iaxe, orig,idtmed[numed]);
    //*
  } else if (!strcmp(key,"DIVT")) {
    sscanf(&card[5],"'%[^']' '%[^']' %f %d %d %d", name, mother, &step, &iaxe, &numed, &ndvmx);
    gMC->Gsdvt ( name, mother, step, iaxe, idtmed[numed], ndvmx);
    //*
  } else if (!strcmp(key,"DVT2")) {
    sscanf(&card[5],"'%[^']' '%[^']' %f %d %f %d %d", name, mother, &step, &iaxe, &orig, &numed, &ndvmx);
    gMC->Gsdvt2 ( name, mother, step, iaxe, orig, idtmed[numed], ndvmx );
    //*
  } else if (!strcmp(key,"POSI")) {
    sscanf(&card[5],"'%[^']' %d '%[^']' %f %f %f %d '%[^']'", name, &nr, mother, &xo, &yo, &zo, &irot, konly);
    if( irot<0 || irot>=kMaxRot ) {
      Error("ReadEuclid","POSI %s#%d rotation matrix number %d illegal\n",name,nr,irot);
      exit(1);
    }
    if( idrot[irot] == -99) {
      Error("ReadEuclid","POSI %s#%d undefined matrix number %d\n",name,nr,irot);
      exit(1);
    }
    //*** volume name cannot be the top volume
    for(i=1;i<=nvol;i++) {
      if (!strcmp(volst[i],name)) istop[i]=0;
    }
    //*
    gMC->Gspos  ( name, nr, mother, xo, yo, zo, idrot[irot], konly );
    //*
  } else if (!strcmp(key,"POSP")) {
    sscanf(&card[5],"'%[^']' %d '%[^']' %f %f %f %d '%[^']' %d", name, &nr, mother, &xo, &yo, &zo, &irot, konly, &npar);
    if( irot<0 || irot>=kMaxRot ) {
      Error("ReadEuclid","POSP %s#%d rotation matrix number %d illegal\n",name,nr,irot);
      exit(1);
    }
    if( idrot[irot] == -99) {
      Error("ReadEuclid","POSP %s#%d undefined matrix number %d\n",name,nr,irot);
      exit(1);
    }
    if (npar > 0) {
      for(i=0;i<npar;i++) fscanf(lun,"%f",&par[i]);
      fscanf(lun,"%*c");
    }
    //*** volume name cannot be the top volume
    for(i=1;i<=nvol;i++) {
      if (!strcmp(volst[i],name)) istop[i]=0;
    }
    //*
    gMC->Gsposp ( name, nr, mother, xo,yo,zo, idrot[irot], konly, par, npar);
  }
  //*
  if (strcmp(key,"END")) goto L10;
  //* find top volume in the geometry
  flag=0;
  for(i=1;i<=nvol;i++) {
    if (istop[i] && flag) {
      AliWarning(Form(" %s is another possible top volume",volst[i]));
    }
    if (istop[i] && !flag) {
      strcpy(topvol,volst[i]);
      AliDebug(2, Form("volume %s taken as a top volume",topvol));
      flag=1;
    }
  }
  if (!flag) {
    AliWarning("top volume not found");
  }
  fclose (lun);
  //*
  //*     commented out only for the not cernlib version
  AliDebug(1, Form("file: %s is now read in",filnam));
  //
  return;
  //*
  L20:
  AliError("reading error or premature end of file");
}

//_______________________________________________________________________
void AliModule::ReadEuclidMedia(const char* filnam)
{
  //                                                                     
  //       read in the materials and tracking media for the detector     
  //                   in euclid file format                             
  //                                                                     
  //       filnam: name of the input file                                
  //       id_det: id_det is the detector identification (2=its,...)     
  //                                                                     
  //            author : miroslav helbich                                
  //
  Float_t sxmgmx = gAlice->Field()->Max();
  Int_t   isxfld = gAlice->Field()->Integ();
  Int_t end, i, iret, itmed;
  char key[5], card[130], natmed[21], namate[21];
  Float_t ubuf[50];
  char* filtmp;
  FILE *lun;
  Int_t imate;
  Int_t nwbuf, isvol, ifield, nmat;
  Float_t a, z, dens, radl, absl, fieldm, tmaxfd, stemax, deemax, epsil, stmin;
  //
  end=strlen(filnam);
  for(i=0;i<end;i++) if(filnam[i]=='.') {
    end=i;
    break;
  }
  //
  // *** The input filnam name will be with extension '.euc'
  AliDebug(1, Form("The file name is %s",filnam)); //Debug
  filtmp=gSystem->ExpandPathName(filnam);
  lun=fopen(filtmp,"r");
  delete [] filtmp;
  if(!lun) {
    AliWarning(Form("Could not open file %s",filnam));
    return;
  }
  //
  // Retrieve Mag Field parameters
  Int_t globField=gAlice->Field()->Integ();
  Float_t globMaxField=gAlice->Field()->Max();
  //  TArrayI &idtmed = *fIdtmed;
  //
 L10:
  for(i=0;i<130;i++) card[i]=0;
  iret=fscanf(lun,"%4s %[^\n]",key,card);
  if(iret<=0) goto L20;
  fscanf(lun,"%*c");
  //*
  //* read material
  if (!strcmp(key,"MATE")) {
    sscanf(card,"%d '%[^']' %f %f %f %f %f %d",&imate,namate,&a,&z,&dens,&radl,&absl,&nwbuf);
    if (nwbuf>0) for(i=0;i<nwbuf;i++) fscanf(lun,"%f",&ubuf[i]);
    //Pad the string with blanks
    i=-1;
    while(namate[++i]);
    while(i<20) namate[i++]=' ';
    namate[i]='\0';
    //
    AliMaterial(imate,namate,a,z,dens,radl,absl,ubuf,nwbuf);
    //* read tracking medium
  } else if (!strcmp(key,"TMED")) {
    sscanf(card,"%d '%[^']' %d %d %d %f %f %f %f %f %f %d",
	   &itmed,natmed,&nmat,&isvol,&ifield,&fieldm,&tmaxfd,
	   &stemax,&deemax,&epsil,&stmin,&nwbuf);
    if (nwbuf>0) for(i=0;i<nwbuf;i++) fscanf(lun,"%f",&ubuf[i]);
    if (ifield<0) ifield=isxfld;
    if (fieldm<0) fieldm=sxmgmx;
    //Pad the string with blanks
    i=-1;
    while(natmed[++i]);
    while(i<20) natmed[i++]=' ';
    natmed[i]='\0';
    //
    AliMedium(itmed,natmed,nmat,isvol,globField,globMaxField,tmaxfd,
		   stemax,deemax,epsil,stmin,ubuf,nwbuf);
    //    (*fImedia)[idtmed[itmed]-1]=id_det;
    //*
  }
  //*
  if (strcmp(key,"END")) goto L10;
  fclose (lun);
  //*
  //*     commented out only for the not cernlib version
  AliDebug(1, Form("file %s is now read in",filnam));
  //*
  return;
  //*
 L20:
  AliWarning("reading error or premature end of file");
} 

//_______________________________________________________________________
void AliModule::AddAlignableVolumes() const
{
  // 
  if (IsActive())
    AliWarning(Form(" %s still has to implement the AddAlignableVolumes method!",GetName()));
}

//_______________________________________________________________________

AliLoader*  AliModule::MakeLoader(const char* /*topfoldername*/)
{
  return 0x0;
}
 

//_____________________________________________________________________________
AliTrackReference*  AliModule::AddTrackReference(Int_t label, Int_t id){
  //
  // add a trackrefernce to the list
    return (gAlice->GetMCApp()->AddTrackReference(label, id));
}

 //_______________________________________________________________________
AliTrackReference* AliModule::FirstTrackReference(Int_t track)
{
    //
    // Initialise the hit iterator
    // Return the address of the first hit for track
    // If track>=0 the track is read from disk
    // while if track0 the first hit of the current
    // track is returned
    //
    if(track>=0)
    {
	if (fRunLoader == 0x0)
	    AliFatal("AliRunLoader not initialized. Can not proceed");
	fRunLoader->GetAliRun()->GetMCApp()->ResetTrackReferences();
	fRunLoader->TreeTR()->GetEvent(track);
    }
    //
    fMaxIterTrackRef     = fTrackReferences->GetEntriesFast();
    fCurrentIterTrackRef = 0;
    if(fMaxIterTrackRef) return dynamic_cast<AliTrackReference*>(fTrackReferences->UncheckedAt(0));
    else            return 0;
}

 //_______________________________________________________________________
AliTrackReference* AliModule::NextTrackReference()
{
    //
    // Return the next hit for the current track
    //
    if(fMaxIterTrackRef) {
	if(++fCurrentIterTrackRef < fMaxIterTrackRef)
	    return dynamic_cast<AliTrackReference*>(fTrackReferences->UncheckedAt(fCurrentIterTrackRef));
	else
	    return 0;
    } else {
	AliWarning("Iterator called without calling FistTrackReference before");
	return 0;
    }
}




//_____________________________________________________________________________
TTree* AliModule::TreeTR()
{
  //
  // Return TR tree pointer
  //
  if ( fRunLoader == 0x0)
   {
     AliError("Can not get the run loader");
     return 0x0;
   }

  TTree* tree = fRunLoader->TreeTR();
  return tree;
}


//_____________________________________________________________________________
void AliModule::Digits2Raw()
{
// This is a dummy version that just copies the digits file contents
// to a raw data file.

  AliWarning(Form("Dummy version called for %s", GetName()));

  Int_t nDDLs = AliDAQ::NumberOfDdls(GetName());

  if (!GetLoader()) return;
  fstream digitsFile(GetLoader()->GetDigitsFileName(), ios::in);
  if (!digitsFile) return;

  digitsFile.seekg(0, ios::end);
  UInt_t size = digitsFile.tellg();
  UInt_t ddlSize = 4 * (size / (4*nDDLs));
  Char_t* buffer = new Char_t[ddlSize+1];

  for (Int_t iDDL = 0; iDDL < nDDLs; iDDL++) {
    char fileName[20];
    strcpy(fileName,AliDAQ::DdlFileName(GetName(),iDDL));
    fstream rawFile(fileName, ios::out);
    if (!rawFile) return;

    AliRawDataHeader header;
    header.fSize = ddlSize + sizeof(header);
    rawFile.write((char*) &header, sizeof(header));

    digitsFile.read(buffer, ddlSize);
    rawFile.write(buffer, ddlSize);
    rawFile.close();
  }

  digitsFile.close();
  delete[] buffer;
}