Correct call to CheckOverlap method of TGeo (R.Grosso)

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

/* $Id$ */

///////////////////////////////////////////////////////////////////////////////
//                                                                           //
// class for running the reconstruction                                      //
//                                                                           //
// Clusters and tracks are created for all detectors and all events by       //
// typing:                                                                   //
//                                                                           //
//   AliReconstruction rec;                                                  //
//   rec.Run();                                                              //
//                                                                           //
// The Run method returns kTRUE in case of successful execution.             //
//                                                                           //
// If the input to the reconstruction are not simulated digits but raw data, //
// this can be specified by an argument of the Run method or by the method   //
//                                                                           //
//   rec.SetInput("...");                                                    //
//                                                                           //
// The input formats and the corresponding argument are:                     //
// - DDL raw data files: directory name, ends with "/"                       //
// - raw data root file: root file name, extension ".root"                   //
// - raw data DATE file: DATE file name, any other non-empty string          //
// - MC root files     : empty string, default                               //
//                                                                           //
// By default all events are reconstructed. The reconstruction can be        //
// limited to a range of events by giving the index of the first and the     //
// last event as an argument to the Run method or by calling                 //
//                                                                           //
//   rec.SetEventRange(..., ...);                                            //
//                                                                           //
// The index -1 (default) can be used for the last event to indicate no      //
// upper limit of the event range.                                           //
//                                                                           //
// The name of the galice file can be changed from the default               //
// "galice.root" by passing it as argument to the AliReconstruction          //
// constructor or by                                                         //
//                                                                           //
//   rec.SetGAliceFile("...");                                               //
//                                                                           //
// The local reconstruction can be switched on or off for individual         //
// detectors by                                                              //
//                                                                           //
//   rec.SetRunLocalReconstruction("...");                                   //
//                                                                           //
// The argument is a (case sensitive) string with the names of the           //
// detectors separated by a space. The special string "ALL" selects all      //
// available detectors. This is the default.                                 //
//                                                                           //
// The reconstruction of the primary vertex position can be switched off by  //
//                                                                           //
//   rec.SetRunVertexFinder(kFALSE);                                         //
//                                                                           //
// The tracking and the creation of ESD tracks can be switched on for        //
// selected detectors by                                                     //
//                                                                           //
//   rec.SetRunTracking("...");                                              //
//                                                                           //
// Uniform/nonuniform field tracking switches (default: uniform field)       //
//                                                                           //
//   rec.SetUniformFieldTracking(); ( rec.SetUniformFieldTracking(kFALSE); ) //
//                                                                           //
// The filling of additional ESD information can be steered by               //
//                                                                           //
//   rec.SetFillESD("...");                                                  //
//                                                                           //
// Again, for both methods the string specifies the list of detectors.       //
// The default is "ALL".                                                     //
//                                                                           //
// The call of the shortcut method                                           //
//                                                                           //
//   rec.SetRunReconstruction("...");                                        //
//                                                                           //
// is equivalent to calling SetRunLocalReconstruction, SetRunTracking and    //
// SetFillESD with the same detector selecting string as argument.           //
//                                                                           //
// The reconstruction requires digits or raw data as input. For the creation //
// of digits and raw data have a look at the class AliSimulation.            //
//                                                                           //
// For debug purposes the method SetCheckPointLevel can be used. If the      //
// argument is greater than 0, files with ESD events will be written after   //
// selected steps of the reconstruction for each event:                      //
//   level 1: after tracking and after filling of ESD (final)                //
//   level 2: in addition after each tracking step                           //
//   level 3: in addition after the filling of ESD for each detector         //
// If a final check point file exists for an event, this event will be       //
// skipped in the reconstruction. The tracking and the filling of ESD for    //
// a detector will be skipped as well, if the corresponding check point      //
// file exists. The ESD event will then be loaded from the file instead.     //
//                                                                           //
///////////////////////////////////////////////////////////////////////////////

#include <TArrayF.h>
#include <TFile.h>
#include <TSystem.h>
#include <TROOT.h>
#include <TPluginManager.h>
#include <TStopwatch.h>
#include <TGeoManager.h>
#include <TLorentzVector.h>

#include "AliReconstruction.h"
#include "AliReconstructor.h"
#include "AliLog.h"
#include "AliRunLoader.h"
#include "AliRun.h"
#include "AliRawReaderFile.h"
#include "AliRawReaderDate.h"
#include "AliRawReaderRoot.h"
#include "AliESD.h"
#include "AliESDfriend.h"
#include "AliESDVertex.h"
#include "AliTracker.h"
#include "AliVertexer.h"
#include "AliVertexerTracks.h"
#include "AliHeader.h"
#include "AliGenEventHeader.h"
#include "AliPID.h"
#include "AliESDpid.h"
#include "AliESDtrack.h"

#include "AliRunTag.h"
#include "AliDetectorTag.h"
#include "AliEventTag.h"

#include "AliTrackPointArray.h"
#include "AliCDBManager.h"
#include "AliCDBEntry.h"
#include "AliAlignObj.h"

#include "AliCentralTrigger.h"
#include "AliCTPRawStream.h"

ClassImp(AliReconstruction)


//_____________________________________________________________________________
const char* AliReconstruction::fgkDetectorName[AliReconstruction::fgkNDetectors] = {"ITS", "TPC", "TRD", "TOF", "PHOS", "RICH", "EMCAL", "MUON", "FMD", "ZDC", "PMD", "START", "VZERO", "CRT", "HLT"};

//_____________________________________________________________________________
AliReconstruction::AliReconstruction(const char* gAliceFilename, const char* cdbUri,
				     const char* name, const char* title) :
  TNamed(name, title),

  fUniformField(kTRUE),
  fRunVertexFinder(kTRUE),
  fRunHLTTracking(kFALSE),
  fStopOnError(kFALSE),
  fWriteAlignmentData(kFALSE),
  fWriteESDfriend(kFALSE),
  fFillTriggerESD(kTRUE),

  fRunLocalReconstruction("ALL"),
  fRunTracking("ALL"),
  fFillESD("ALL"),
  fGAliceFileName(gAliceFilename),
  fInput(""),
  fEquipIdMap(""),
  fFirstEvent(0),
  fLastEvent(-1),
  fCheckPointLevel(0),
  fOptions(),
  fLoadAlignFromCDB(kTRUE),
  fLoadAlignData("ALL"),

  fRunLoader(NULL),
  fRawReader(NULL),

  fVertexer(NULL),

  fAlignObjArray(NULL),
  fCDBUri(cdbUri)
{
// create reconstruction object with default parameters
  
  for (Int_t iDet = 0; iDet < fgkNDetectors; iDet++) {
    fReconstructor[iDet] = NULL;
    fLoader[iDet] = NULL;
    fTracker[iDet] = NULL;
  }
  AliPID pid;
}

//_____________________________________________________________________________
AliReconstruction::AliReconstruction(const AliReconstruction& rec) :
  TNamed(rec),

  fUniformField(rec.fUniformField),
  fRunVertexFinder(rec.fRunVertexFinder),
  fRunHLTTracking(rec.fRunHLTTracking),
  fStopOnError(rec.fStopOnError),
  fWriteAlignmentData(rec.fWriteAlignmentData),
  fWriteESDfriend(rec.fWriteESDfriend),
  fFillTriggerESD(rec.fFillTriggerESD),

  fRunLocalReconstruction(rec.fRunLocalReconstruction),
  fRunTracking(rec.fRunTracking),
  fFillESD(rec.fFillESD),
  fGAliceFileName(rec.fGAliceFileName),
  fInput(rec.fInput),
  fEquipIdMap(rec.fEquipIdMap),
  fFirstEvent(rec.fFirstEvent),
  fLastEvent(rec.fLastEvent),
  fCheckPointLevel(0),
  fOptions(),
  fLoadAlignFromCDB(rec.fLoadAlignFromCDB),
  fLoadAlignData(rec.fLoadAlignData),

  fRunLoader(NULL),
  fRawReader(NULL),

  fVertexer(NULL),

  fAlignObjArray(rec.fAlignObjArray),
  fCDBUri(rec.fCDBUri)
{
// copy constructor

  for (Int_t i = 0; i < fOptions.GetEntriesFast(); i++) {
    if (rec.fOptions[i]) fOptions.Add(rec.fOptions[i]->Clone());
  }
  for (Int_t iDet = 0; iDet < fgkNDetectors; iDet++) {
    fReconstructor[iDet] = NULL;
    fLoader[iDet] = NULL;
    fTracker[iDet] = NULL;
  }
}

//_____________________________________________________________________________
AliReconstruction& AliReconstruction::operator = (const AliReconstruction& rec)
{
// assignment operator

  this->~AliReconstruction();
  new(this) AliReconstruction(rec);
  return *this;
}

//_____________________________________________________________________________
AliReconstruction::~AliReconstruction()
{
// clean up

  CleanUp();
  fOptions.Delete();
}

//_____________________________________________________________________________
void AliReconstruction::InitCDBStorage()
{
// activate a default CDB storage
// First check if we have any CDB storage set, because it is used 
// to retrieve the calibration and alignment constants

  AliCDBManager* man = AliCDBManager::Instance();
  if (!man->IsDefaultStorageSet())
  {
    AliWarning("!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!");
    AliWarning("Default CDB storage not yet set");
    AliWarning(Form("Using default storage declared in AliSimulation: %s",fCDBUri.Data()));
    AliWarning("!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!");
    SetDefaultStorage(fCDBUri);
    
    Int_t cdbRun = AliCDBManager::Instance()->GetRun();
    if(cdbRun == -1){
    	AliWarning("AliCDBManager's run number temporarily set to 0!!");
    	AliCDBManager::Instance()->SetRun(0);
    }
  }  
  
}

//_____________________________________________________________________________
void AliReconstruction::SetDefaultStorage(const char* uri) {
// activate a default CDB storage 

   AliCDBManager::Instance()->SetDefaultStorage(uri);

}

//_____________________________________________________________________________
void AliReconstruction::SetSpecificStorage(const char* detName, const char* uri) {
// activate a detector-specific CDB storage 

   AliCDBManager::Instance()->SetSpecificStorage(detName, uri);

}

//_____________________________________________________________________________
Bool_t AliReconstruction::SetRunNumber()
{
  // The method is called in Run() in order
  // to set a correct run number.
  // In case of raw data reconstruction the
  // run number is taken from the raw data header

  if(AliCDBManager::Instance()->GetRun() < 0) {
    if (!fRunLoader) {
      AliError("No run loader is found !"); 
      return kFALSE;
    }
    // read run number from gAlice
    AliCDBManager::Instance()->SetRun(fRunLoader->GetAliRun()->GetRunNumber());
    AliInfo(Form("Run number: %d",AliCDBManager::Instance()->GetRun()));
  }
  return kTRUE;
}

//_____________________________________________________________________________
Bool_t AliReconstruction::ApplyAlignObjsToGeom(TObjArray* alObjArray)
{
  // Read collection of alignment objects (AliAlignObj derived) saved
  // in the TClonesArray ClArrayName and apply them to the geometry
  // manager singleton.
  //
  alObjArray->Sort();
  Int_t nvols = alObjArray->GetEntriesFast();

  Bool_t flag = kTRUE;

  for(Int_t j=0; j<nvols; j++)
    {
      AliAlignObj* alobj = (AliAlignObj*) alObjArray->UncheckedAt(j);
      if (alobj->ApplyToGeometry() == kFALSE) flag = kFALSE;
    }

  if (AliDebugLevelClass() >= 1) {
    gGeoManager->GetTopNode()->CheckOverlaps(20);
    TObjArray* ovexlist = gGeoManager->GetListOfOverlaps();
    if(ovexlist->GetEntriesFast()){  
      AliError("The application of alignment objects to the geometry caused huge overlaps/extrusions!");
   }
  }

  return flag;

}

//_____________________________________________________________________________
Bool_t AliReconstruction::SetAlignObjArraySingleDet(const char* detName)
{
  // Fills array of single detector's alignable objects from CDB
  
  AliDebug(2, Form("Loading alignment data for detector: %s",detName));
  
  AliCDBEntry *entry;
  	
  AliCDBPath path(detName,"Align","Data");
	
  entry=AliCDBManager::Instance()->Get(path.GetPath());
  if(!entry){ 
  	AliDebug(2,Form("Couldn't load alignment data for detector %s",detName));
	return kFALSE;
  }
  entry->SetOwner(1);
  TClonesArray *alignArray = (TClonesArray*) entry->GetObject();	
  alignArray->SetOwner(0);
  AliDebug(2,Form("Found %d alignment objects for %s",
			alignArray->GetEntries(),detName));

  AliAlignObj *alignObj=0;
  TIter iter(alignArray);
	
  // loop over align objects in detector
  while( ( alignObj=(AliAlignObj *) iter.Next() ) ){
  	fAlignObjArray->Add(alignObj);
  }
  // delete entry --- Don't delete, it is cached!
	
  AliDebug(2, Form("fAlignObjArray entries: %d",fAlignObjArray->GetEntries() ));
  return kTRUE;

}

//_____________________________________________________________________________
Bool_t AliReconstruction::MisalignGeometry(const TString& detectors)
{
  // Read the alignment objects from CDB.
  // Each detector is supposed to have the
  // alignment objects in DET/Align/Data CDB path.
  // All the detector objects are then collected,
  // sorted by geometry level (starting from ALIC) and
  // then applied to the TGeo geometry.
  // Finally an overlaps check is performed.

  // Load alignment data from CDB and fill fAlignObjArray 
  if(fLoadAlignFromCDB){
  	if(!fAlignObjArray) fAlignObjArray = new TObjArray();
  	
	//fAlignObjArray->RemoveAll(); 
 	fAlignObjArray->Clear();  	
	fAlignObjArray->SetOwner(0);
 
  	TString detStr = detectors;
  	TString dataNotLoaded="";
  	TString dataLoaded="";
  
	for (Int_t iDet = 0; iDet < fgkNDetectors; iDet++) {
	  if (!IsSelected(fgkDetectorName[iDet], detStr)) continue;
	  if(!SetAlignObjArraySingleDet(fgkDetectorName[iDet])){
	    dataNotLoaded += fgkDetectorName[iDet];
	    dataNotLoaded += " ";
	  } else {
	    dataLoaded += fgkDetectorName[iDet];
	    dataLoaded += " ";
	  }
  	} // end loop over detectors
  
  	if ((detStr.CompareTo("ALL") == 0)) detStr = "";
  	dataNotLoaded += detStr;
  	AliInfo(Form("Alignment data loaded for: %s",
  			  dataLoaded.Data()));
  	AliInfo(Form("Didn't/couldn't load alignment data for: %s",
  			  dataNotLoaded.Data()));
  } // fLoadAlignFromCDB flag
 
  // Check if the array with alignment objects was
  // provided by the user. If yes, apply the objects
  // to the present TGeo geometry
  if (fAlignObjArray) {
    if (gGeoManager && gGeoManager->IsClosed()) {
      if (ApplyAlignObjsToGeom(fAlignObjArray) == kFALSE) {
	AliError("The misalignment of one or more volumes failed!"
		 "Compare the list of simulated detectors and the list of detector alignment data!");
	return kFALSE;
      }
    }
    else {
      AliError("Can't apply the misalignment! gGeoManager doesn't exist or it is still opened!");
      return kFALSE;
    }
  }

  return kTRUE;
}

//_____________________________________________________________________________
void AliReconstruction::SetGAliceFile(const char* fileName)
{
// set the name of the galice file

  fGAliceFileName = fileName;
}

//_____________________________________________________________________________
void AliReconstruction::SetOption(const char* detector, const char* option)
{
// set options for the reconstruction of a detector

  TObject* obj = fOptions.FindObject(detector);
  if (obj) fOptions.Remove(obj);
  fOptions.Add(new TNamed(detector, option));
}


//_____________________________________________________________________________
Bool_t AliReconstruction::Run(const char* input,
			      Int_t firstEvent, Int_t lastEvent)
{
// run the reconstruction

  InitCDBStorage();

  // set the input
  if (!input) input = fInput.Data();
  TString fileName(input);
  if (fileName.EndsWith("/")) {
    fRawReader = new AliRawReaderFile(fileName);
  } else if (fileName.EndsWith(".root")) {
    fRawReader = new AliRawReaderRoot(fileName);
  } else if (!fileName.IsNull()) {
    fRawReader = new AliRawReaderDate(fileName);
    fRawReader->SelectEvents(7);
  }
  if (!fEquipIdMap.IsNull() && fRawReader)
    fRawReader->LoadEquipmentIdsMap(fEquipIdMap);


  // get the run loader
  if (!InitRunLoader()) return kFALSE;

  // Set run number in CDBManager (if it is not already set by the user)
  if (!SetRunNumber()) if (fStopOnError) return kFALSE;

  // Import ideal TGeo geometry and apply misalignment
  if (!gGeoManager) {
    TString geom(gSystem->DirName(fGAliceFileName));
    geom += "/geometry.root";
    TGeoManager::Import(geom.Data());
    if (!gGeoManager) if (fStopOnError) return kFALSE;
  }
  if (!MisalignGeometry(fLoadAlignData)) if (fStopOnError) return kFALSE;

  // Temporary fix by A.Gheata
  // Could be removed with the next Root version (>5.11)
  if (gGeoManager) {
    TIter next(gGeoManager->GetListOfVolumes());
    TGeoVolume *vol;
    while ((vol = (TGeoVolume *)next())) {
      if (vol->GetVoxels()) {
	if (vol->GetVoxels()->NeedRebuild()) {
	  vol->GetVoxels()->Voxelize();
	  vol->FindOverlaps();
	}
      }
    }
  }

  // local reconstruction
  if (!fRunLocalReconstruction.IsNull()) {
    if (!RunLocalReconstruction(fRunLocalReconstruction)) {
      if (fStopOnError) {CleanUp(); return kFALSE;}
    }
  }
//  if (!fRunVertexFinder && fRunTracking.IsNull() && 
//      fFillESD.IsNull()) return kTRUE;

  // get vertexer
  if (fRunVertexFinder && !CreateVertexer()) {
    if (fStopOnError) {
      CleanUp(); 
      return kFALSE;
    }
  }

  // get trackers
  if (!fRunTracking.IsNull() && !CreateTrackers(fRunTracking)) {
    if (fStopOnError) {
      CleanUp(); 
      return kFALSE;
    }      
  }


  TStopwatch stopwatch;
  stopwatch.Start();

  // get the possibly already existing ESD file and tree
  AliESD* esd = new AliESD; AliESD* hltesd = new AliESD;
  TFile* fileOld = NULL;
  TTree* treeOld = NULL; TTree *hlttreeOld = NULL;
  if (!gSystem->AccessPathName("AliESDs.root")){
    gSystem->CopyFile("AliESDs.root", "AliESDs.old.root", kTRUE);
    fileOld = TFile::Open("AliESDs.old.root");
    if (fileOld && fileOld->IsOpen()) {
      treeOld = (TTree*) fileOld->Get("esdTree");
      if (treeOld) treeOld->SetBranchAddress("ESD", &esd);
      hlttreeOld = (TTree*) fileOld->Get("HLTesdTree");
      if (hlttreeOld) hlttreeOld->SetBranchAddress("ESD", &hltesd);
    }
  }

  // create the ESD output file and tree
  TFile* file = TFile::Open("AliESDs.root", "RECREATE");
  if (!file->IsOpen()) {
    AliError("opening AliESDs.root failed");
    if (fStopOnError) {CleanUp(file, fileOld); return kFALSE;}    
  }
  TTree* tree = new TTree("esdTree", "Tree with ESD objects");
  tree->Branch("ESD", "AliESD", &esd);
  TTree* hlttree = new TTree("HLTesdTree", "Tree with HLT ESD objects");
  hlttree->Branch("ESD", "AliESD", &hltesd);
  delete esd; delete hltesd;
  esd = NULL; hltesd = NULL;

  // create the file and tree with ESD additions
  TFile *filef=0; TTree *treef=0; AliESDfriend *esdf=0;
  if (fWriteESDfriend) {
     filef = TFile::Open("AliESDfriends.root", "RECREATE");
     if (!filef->IsOpen()) {
        AliError("opening AliESDfriends.root failed");
     }
     treef = new TTree("esdFriendTree", "Tree with ESD friends");
     treef->Branch("ESDfriend", "AliESDfriend", &esdf);
  }

  gROOT->cd();

  AliVertexerTracks tVertexer;

  // loop over events
  if (fRawReader) fRawReader->RewindEvents();
  
  for (Int_t iEvent = 0; iEvent < fRunLoader->GetNumberOfEvents(); iEvent++) {
    if (fRawReader) fRawReader->NextEvent();
    if ((iEvent < firstEvent) || ((lastEvent >= 0) && (iEvent > lastEvent))) {
      // copy old ESD to the new one
      if (treeOld) {
	treeOld->SetBranchAddress("ESD", &esd);
	treeOld->GetEntry(iEvent);
      }
      tree->Fill();
      if (hlttreeOld) {
	hlttreeOld->SetBranchAddress("ESD", &hltesd);
	hlttreeOld->GetEntry(iEvent);
      }
      hlttree->Fill();
      continue;
    }

    AliInfo(Form("processing event %d", iEvent));
    fRunLoader->GetEvent(iEvent);

    char fileName[256];
    sprintf(fileName, "ESD_%d.%d_final.root", 
	    fRunLoader->GetHeader()->GetRun(), 
	    fRunLoader->GetHeader()->GetEventNrInRun());
    if (!gSystem->AccessPathName(fileName)) continue;

    // local reconstruction
    if (!fRunLocalReconstruction.IsNull()) {
      if (!RunLocalEventReconstruction(fRunLocalReconstruction)) {
	if (fStopOnError) {CleanUp(file, fileOld); return kFALSE;}
      }
    }

    esd = new AliESD; hltesd = new AliESD;
    esd->SetRunNumber(fRunLoader->GetHeader()->GetRun());
    hltesd->SetRunNumber(fRunLoader->GetHeader()->GetRun());
    esd->SetEventNumber(fRunLoader->GetHeader()->GetEventNrInRun());
    hltesd->SetEventNumber(fRunLoader->GetHeader()->GetEventNrInRun());
    if (gAlice) {
      esd->SetMagneticField(AliTracker::GetBz());
      hltesd->SetMagneticField(AliTracker::GetBz());
    } else {
      // ???
    }

    // vertex finder
    if (fRunVertexFinder) {
      if (!ReadESD(esd, "vertex")) {
	if (!RunVertexFinder(esd)) {
	  if (fStopOnError) {CleanUp(file, fileOld); return kFALSE;}
	}
	if (fCheckPointLevel > 0) WriteESD(esd, "vertex");
      }
    }

    // HLT tracking
    if (!fRunTracking.IsNull()) {
      if (fRunHLTTracking) {
	hltesd->SetVertex(esd->GetVertex());
	if (!RunHLTTracking(hltesd)) {
	  if (fStopOnError) {CleanUp(file, fileOld); return kFALSE;}
	}
      }
    }

    // barrel tracking
    if (!fRunTracking.IsNull()) {
      if (!ReadESD(esd, "tracking")) {
	if (!RunTracking(esd)) {
	  if (fStopOnError) {CleanUp(file, fileOld); return kFALSE;}
	}
	if (fCheckPointLevel > 0) WriteESD(esd, "tracking");
      }
    }

    // fill ESD
    if (!fFillESD.IsNull()) {
      if (!FillESD(esd, fFillESD)) {
	if (fStopOnError) {CleanUp(file, fileOld); return kFALSE;}
      }
    }

    // combined PID
    AliESDpid::MakePID(esd);
    if (fCheckPointLevel > 1) WriteESD(esd, "PID");

    if (fFillTriggerESD) {
      if (!ReadESD(esd, "trigger")) {
	if (!FillTriggerESD(esd)) {
	  if (fStopOnError) {CleanUp(file, fileOld); return kFALSE;}
	}
	if (fCheckPointLevel > 1) WriteESD(esd, "trigger");
      }
    }

    esd->SetPrimaryVertex(tVertexer.FindPrimaryVertex(esd));

    // write ESD
    tree->Fill();
    // write HLT ESD
    hlttree->Fill();

    // write ESD friend
    if (fWriteESDfriend) {
       esdf=new AliESDfriend();
       esd->GetESDfriend(esdf);
       treef->Fill();  
    }

    if (fCheckPointLevel > 0)  WriteESD(esd, "final"); 
 
    delete esd; delete hltesd;
    esd = NULL; hltesd = NULL;
  }

  AliInfo(Form("Execution time for filling ESD : R:%.2fs C:%.2fs",
	       stopwatch.RealTime(),stopwatch.CpuTime()));

  file->cd();
  tree->Write();
  hlttree->Write();

  if (fWriteESDfriend) {
     filef->cd();
     treef->Write(); delete treef; filef->Close(); delete filef; 
  }

  // Create tags for the events in the ESD tree (the ESD tree is always present)
  // In case of empty events the tags will contain dummy values
  CreateTag(file);
  CleanUp(file, fileOld);

  return kTRUE;
}


//_____________________________________________________________________________
Bool_t AliReconstruction::RunLocalReconstruction(const TString& detectors)
{
// run the local reconstruction

  TStopwatch stopwatch;
  stopwatch.Start();

  TString detStr = detectors;
  for (Int_t iDet = 0; iDet < fgkNDetectors; iDet++) {
    if (!IsSelected(fgkDetectorName[iDet], detStr)) continue;
    AliReconstructor* reconstructor = GetReconstructor(iDet);
    if (!reconstructor) continue;
    if (reconstructor->HasLocalReconstruction()) continue;

    AliInfo(Form("running reconstruction for %s", fgkDetectorName[iDet]));
    TStopwatch stopwatchDet;
    stopwatchDet.Start();
    if (fRawReader) {
      fRawReader->RewindEvents();
      reconstructor->Reconstruct(fRunLoader, fRawReader);
    } else {
      reconstructor->Reconstruct(fRunLoader);
    }
    AliInfo(Form("Execution time for %s: R:%.2fs C:%.2fs",
		 fgkDetectorName[iDet],
		 stopwatchDet.RealTime(),stopwatchDet.CpuTime()));
  }

  if ((detStr.CompareTo("ALL") != 0) && !detStr.IsNull()) {
    AliError(Form("the following detectors were not found: %s",
                  detStr.Data()));
    if (fStopOnError) return kFALSE;
  }

  AliInfo(Form("Execution time: R:%.2fs C:%.2fs",
	       stopwatch.RealTime(),stopwatch.CpuTime()));

  return kTRUE;
}

//_____________________________________________________________________________
Bool_t AliReconstruction::RunLocalEventReconstruction(const TString& detectors)
{
// run the local reconstruction

  TStopwatch stopwatch;
  stopwatch.Start();

  TString detStr = detectors;
  for (Int_t iDet = 0; iDet < fgkNDetectors; iDet++) {
    if (!IsSelected(fgkDetectorName[iDet], detStr)) continue;
    AliReconstructor* reconstructor = GetReconstructor(iDet);
    if (!reconstructor) continue;
    AliLoader* loader = fLoader[iDet];

    // conversion of digits
    if (fRawReader && reconstructor->HasDigitConversion()) {
      AliInfo(Form("converting raw data digits into root objects for %s", 
		   fgkDetectorName[iDet]));
      TStopwatch stopwatchDet;
      stopwatchDet.Start();
      loader->LoadDigits("update");
      loader->CleanDigits();
      loader->MakeDigitsContainer();
      TTree* digitsTree = loader->TreeD();
      reconstructor->ConvertDigits(fRawReader, digitsTree);
      loader->WriteDigits("OVERWRITE");
      loader->UnloadDigits();
      AliInfo(Form("Execution time for %s: R:%.2fs C:%.2fs",
		   fgkDetectorName[iDet],
		   stopwatchDet.RealTime(),stopwatchDet.CpuTime()));
    }

    // local reconstruction
    if (!reconstructor->HasLocalReconstruction()) continue;
    AliInfo(Form("running reconstruction for %s", fgkDetectorName[iDet]));
    TStopwatch stopwatchDet;
    stopwatchDet.Start();
    loader->LoadRecPoints("update");
    loader->CleanRecPoints();
    loader->MakeRecPointsContainer();
    TTree* clustersTree = loader->TreeR();
    if (fRawReader && !reconstructor->HasDigitConversion()) {
      reconstructor->Reconstruct(fRawReader, clustersTree);
    } else {
      loader->LoadDigits("read");
      TTree* digitsTree = loader->TreeD();
      if (!digitsTree) {
	AliError(Form("Can't get the %s digits tree", fgkDetectorName[iDet]));
	if (fStopOnError) return kFALSE;
      } else {
	reconstructor->Reconstruct(digitsTree, clustersTree);
      }
      loader->UnloadDigits();
    }
    loader->WriteRecPoints("OVERWRITE");
    loader->UnloadRecPoints();
    AliDebug(1,Form("Execution time for %s: R:%.2fs C:%.2fs",
		    fgkDetectorName[iDet],
		    stopwatchDet.RealTime(),stopwatchDet.CpuTime()));
  }

  if ((detStr.CompareTo("ALL") != 0) && !detStr.IsNull()) {
    AliError(Form("the following detectors were not found: %s",
                  detStr.Data()));
    if (fStopOnError) return kFALSE;
  }
  
  AliInfo(Form("Execution time: R:%.2fs C:%.2fs",
	       stopwatch.RealTime(),stopwatch.CpuTime()));

  return kTRUE;
}

//_____________________________________________________________________________
Bool_t AliReconstruction::RunVertexFinder(AliESD*& esd)
{
// run the barrel tracking

  TStopwatch stopwatch;
  stopwatch.Start();

  AliESDVertex* vertex = NULL;
  Double_t vtxPos[3] = {0, 0, 0};
  Double_t vtxErr[3] = {0.07, 0.07, 0.1};
  TArrayF mcVertex(3); 
  if (fRunLoader->GetHeader() && fRunLoader->GetHeader()->GenEventHeader()) {
    fRunLoader->GetHeader()->GenEventHeader()->PrimaryVertex(mcVertex);
    for (Int_t i = 0; i < 3; i++) vtxPos[i] = mcVertex[i];
  }

  if (fVertexer) {
    AliInfo("running the ITS vertex finder");
    if (fLoader[0]) fLoader[0]->LoadRecPoints();
    vertex = fVertexer->FindVertexForCurrentEvent(fRunLoader->GetEventNumber());
    if (fLoader[0]) fLoader[0]->UnloadRecPoints();
    if(!vertex){
      AliWarning("Vertex not found");
      vertex = new AliESDVertex();
      vertex->SetName("default");
    }
    else {
      vertex->SetTruePos(vtxPos);  // store also the vertex from MC
      vertex->SetName("reconstructed");
    }

  } else {
    AliInfo("getting the primary vertex from MC");
    vertex = new AliESDVertex(vtxPos, vtxErr);
  }

  if (vertex) {
    vertex->GetXYZ(vtxPos);
    vertex->GetSigmaXYZ(vtxErr);
  } else {
    AliWarning("no vertex reconstructed");
    vertex = new AliESDVertex(vtxPos, vtxErr);
  }
  esd->SetVertex(vertex);
  for (Int_t iDet = 0; iDet < fgkNDetectors; iDet++) {
    if (fTracker[iDet]) fTracker[iDet]->SetVertex(vtxPos, vtxErr);
  }  
  delete vertex;

  AliInfo(Form("Execution time: R:%.2fs C:%.2fs",
	       stopwatch.RealTime(),stopwatch.CpuTime()));

  return kTRUE;
}

//_____________________________________________________________________________
Bool_t AliReconstruction::RunHLTTracking(AliESD*& esd)
{
// run the HLT barrel tracking

  TStopwatch stopwatch;
  stopwatch.Start();

  if (!fRunLoader) {
    AliError("Missing runLoader!");
    return kFALSE;
  }

  AliInfo("running HLT tracking");

  // Get a pointer to the HLT reconstructor
  AliReconstructor *reconstructor = GetReconstructor(fgkNDetectors-1);
  if (!reconstructor) return kFALSE;

  // TPC + ITS
  for (Int_t iDet = 1; iDet >= 0; iDet--) {
    TString detName = fgkDetectorName[iDet];
    AliDebug(1, Form("%s HLT tracking", detName.Data()));
    reconstructor->SetOption(detName.Data());
    AliTracker *tracker = reconstructor->CreateTracker(fRunLoader);
    if (!tracker) {
      AliWarning(Form("couldn't create a HLT tracker for %s", detName.Data()));
      if (fStopOnError) return kFALSE;
      continue;
    }
    Double_t vtxPos[3];
    Double_t vtxErr[3]={0.005,0.005,0.010};
    const AliESDVertex *vertex = esd->GetVertex();
    vertex->GetXYZ(vtxPos);
    tracker->SetVertex(vtxPos,vtxErr);
    if(iDet != 1) {
      fLoader[iDet]->LoadRecPoints("read");
      TTree* tree = fLoader[iDet]->TreeR();
      if (!tree) {
	AliError(Form("Can't get the %s cluster tree", detName.Data()));
	return kFALSE;
      }
      tracker->LoadClusters(tree);
    }
    if (tracker->Clusters2Tracks(esd) != 0) {
      AliError(Form("HLT %s Clusters2Tracks failed", fgkDetectorName[iDet]));
      return kFALSE;
    }
    if(iDet != 1) {
      tracker->UnloadClusters();
    }
    delete tracker;
  }

  AliInfo(Form("Execution time: R:%.2fs C:%.2fs",
	       stopwatch.RealTime(),stopwatch.CpuTime()));

  return kTRUE;
}

//_____________________________________________________________________________
Bool_t AliReconstruction::RunTracking(AliESD*& esd)
{
// run the barrel tracking

  TStopwatch stopwatch;
  stopwatch.Start();

  AliInfo("running tracking");

  // pass 1: TPC + ITS inwards
  for (Int_t iDet = 1; iDet >= 0; iDet--) {
    if (!fTracker[iDet]) continue;
    AliDebug(1, Form("%s tracking", fgkDetectorName[iDet]));

    // load clusters
    fLoader[iDet]->LoadRecPoints("read");
    TTree* tree = fLoader[iDet]->TreeR();
    if (!tree) {
      AliError(Form("Can't get the %s cluster tree", fgkDetectorName[iDet]));
      return kFALSE;
    }
    fTracker[iDet]->LoadClusters(tree);

    // run tracking
    if (fTracker[iDet]->Clusters2Tracks(esd) != 0) {
      AliError(Form("%s Clusters2Tracks failed", fgkDetectorName[iDet]));
      return kFALSE;
    }
    if (fCheckPointLevel > 1) {
      WriteESD(esd, Form("%s.tracking", fgkDetectorName[iDet]));
    }
    // preliminary PID in TPC needed by the ITS tracker
    if (iDet == 1) {
      GetReconstructor(1)->FillESD(fRunLoader, esd);
      GetReconstructor(1)->FillESD((TTree*)NULL, (TTree*)NULL, esd);
      AliESDpid::MakePID(esd);
    }
  }

  // pass 2: ALL backwards
  for (Int_t iDet = 0; iDet < fgkNDetectors; iDet++) {
    if (!fTracker[iDet]) continue;
    AliDebug(1, Form("%s back propagation", fgkDetectorName[iDet]));

    // load clusters
    if (iDet > 1) {     // all except ITS, TPC
      TTree* tree = NULL;
      fLoader[iDet]->LoadRecPoints("read");
      tree = fLoader[iDet]->TreeR();
      if (!tree) {
	AliError(Form("Can't get the %s cluster tree", fgkDetectorName[iDet]));
	return kFALSE;
      }
      fTracker[iDet]->LoadClusters(tree);
    }

    // run tracking
    if (fTracker[iDet]->PropagateBack(esd) != 0) {
      AliError(Form("%s backward propagation failed", fgkDetectorName[iDet]));
      return kFALSE;
    }
    if (fCheckPointLevel > 1) {
      WriteESD(esd, Form("%s.back", fgkDetectorName[iDet]));
    }

    // unload clusters
    if (iDet > 2) {     // all except ITS, TPC, TRD
      fTracker[iDet]->UnloadClusters();
      fLoader[iDet]->UnloadRecPoints();
    }
    // updated PID in TPC needed by the ITS tracker -MI
    if (iDet == 1) {
      GetReconstructor(1)->FillESD(fRunLoader, esd);
      GetReconstructor(1)->FillESD((TTree*)NULL, (TTree*)NULL, esd);
      AliESDpid::MakePID(esd);
    }
  }

  // write space-points to the ESD in case alignment data output
  // is switched on
  if (fWriteAlignmentData)
    WriteAlignmentData(esd);

  // pass 3: TRD + TPC + ITS refit inwards
  for (Int_t iDet = 2; iDet >= 0; iDet--) {
    if (!fTracker[iDet]) continue;
    AliDebug(1, Form("%s inward refit", fgkDetectorName[iDet]));

    // run tracking
    if (fTracker[iDet]->RefitInward(esd) != 0) {
      AliError(Form("%s inward refit failed", fgkDetectorName[iDet]));
      return kFALSE;
    }
    if (fCheckPointLevel > 1) {
      WriteESD(esd, Form("%s.refit", fgkDetectorName[iDet]));
    }

    // unload clusters
    fTracker[iDet]->UnloadClusters();
    fLoader[iDet]->UnloadRecPoints();
  }
  //
  // Propagate track to the vertex - if not done by ITS
  //
  Int_t ntracks = esd->GetNumberOfTracks();
  for (Int_t itrack=0; itrack<ntracks; itrack++){
    const Double_t kRadius  = 3;   // beam pipe radius
    const Double_t kMaxStep = 5;   // max step
    const Double_t kMaxD    = 123456;  // max distance to prim vertex
    Double_t       fieldZ   = AliTracker::GetBz();  //
    AliESDtrack * track = esd->GetTrack(itrack);
    if (!track) continue;
    if (track->IsOn(AliESDtrack::kITSrefit)) continue;
    track->PropagateTo(kRadius, fieldZ, track->GetMass(),kMaxStep,kTRUE);
    track->RelateToVertex(esd->GetVertex(),fieldZ, kMaxD);
  }
  
  AliInfo(Form("Execution time: R:%.2fs C:%.2fs",
	       stopwatch.RealTime(),stopwatch.CpuTime()));

  return kTRUE;
}

//_____________________________________________________________________________
Bool_t AliReconstruction::FillESD(AliESD*& esd, const TString& detectors)
{
// fill the event summary data

  TStopwatch stopwatch;
  stopwatch.Start();
  AliInfo("filling ESD");

  TString detStr = detectors;
  for (Int_t iDet = 0; iDet < fgkNDetectors; iDet++) {
    if (!IsSelected(fgkDetectorName[iDet], detStr)) continue;
    AliReconstructor* reconstructor = GetReconstructor(iDet);
    if (!reconstructor) continue;

    if (!ReadESD(esd, fgkDetectorName[iDet])) {
      AliDebug(1, Form("filling ESD for %s", fgkDetectorName[iDet]));
      TTree* clustersTree = NULL;
      if (reconstructor->HasLocalReconstruction() && fLoader[iDet]) {
	fLoader[iDet]->LoadRecPoints("read");
	clustersTree = fLoader[iDet]->TreeR();
	if (!clustersTree) {
	  AliError(Form("Can't get the %s clusters tree", 
			fgkDetectorName[iDet]));
	  if (fStopOnError) return kFALSE;
	}
      }
      if (fRawReader && !reconstructor->HasDigitConversion()) {
        reconstructor->FillESD(fRawReader, clustersTree, esd);
      } else {
	TTree* digitsTree = NULL;
	if (fLoader[iDet]) {
	  fLoader[iDet]->LoadDigits("read");
	  digitsTree = fLoader[iDet]->TreeD();
	  if (!digitsTree) {
	    AliError(Form("Can't get the %s digits tree", 
			  fgkDetectorName[iDet]));
	    if (fStopOnError) return kFALSE;
	  }
	}
	reconstructor->FillESD(digitsTree, clustersTree, esd);
	if (fLoader[iDet]) fLoader[iDet]->UnloadDigits();
      }
      if (reconstructor->HasLocalReconstruction() && fLoader[iDet]) {
	fLoader[iDet]->UnloadRecPoints();
      }

      if (fRawReader) {
        reconstructor->FillESD(fRunLoader, fRawReader, esd);
      } else {
        reconstructor->FillESD(fRunLoader, esd);
      }
      if (fCheckPointLevel > 2) WriteESD(esd, fgkDetectorName[iDet]);
    }
  }

  if ((detStr.CompareTo("ALL") != 0) && !detStr.IsNull()) {
    AliError(Form("the following detectors were not found: %s", 
                  detStr.Data()));
    if (fStopOnError) return kFALSE;
  }

  AliInfo(Form("Execution time: R:%.2fs C:%.2fs",
	       stopwatch.RealTime(),stopwatch.CpuTime()));

  return kTRUE;
}

//_____________________________________________________________________________
Bool_t AliReconstruction::FillTriggerESD(AliESD*& esd)
{
  // Reads the trigger decision which is
  // stored in Trigger.root file and fills
  // the corresponding esd entries

  AliInfo("Filling trigger information into the ESD");

  if (fRawReader) {
    AliCTPRawStream input(fRawReader);
    if (!input.Next()) {
      AliError("No valid CTP (trigger) DDL raw data is found ! The trigger information is not stored in the ESD !");
      return kFALSE;
    }
    esd->SetTriggerMask(input.GetClassMask());
    esd->SetTriggerCluster(input.GetClusterMask());
  }
  else {
    AliRunLoader *runloader = AliRunLoader::GetRunLoader();
    if (runloader) {
      if (!runloader->LoadTrigger()) {
	AliCentralTrigger *aCTP = runloader->GetTrigger();
	esd->SetTriggerMask(aCTP->GetClassMask());
	esd->SetTriggerCluster(aCTP->GetClusterMask());
      }
      else {
	AliWarning("No trigger can be loaded! The trigger information is not stored in the ESD !");
	return kFALSE;
      }
    }
    else {
      AliError("No run loader is available! The trigger information is not stored in the ESD !");
      return kFALSE;
    }
  }

  return kTRUE;
}

//_____________________________________________________________________________
Bool_t AliReconstruction::IsSelected(TString detName, TString& detectors) const
{
// check whether detName is contained in detectors
// if yes, it is removed from detectors

  // check if all detectors are selected
  if ((detectors.CompareTo("ALL") == 0) ||
      detectors.BeginsWith("ALL ") ||
      detectors.EndsWith(" ALL") ||
      detectors.Contains(" ALL ")) {
    detectors = "ALL";
    return kTRUE;
  }

  // search for the given detector
  Bool_t result = kFALSE;
  if ((detectors.CompareTo(detName) == 0) ||
      detectors.BeginsWith(detName+" ") ||
      detectors.EndsWith(" "+detName) ||
      detectors.Contains(" "+detName+" ")) {
    detectors.ReplaceAll(detName, "");
    result = kTRUE;
  }

  // clean up the detectors string
  while (detectors.Contains("  ")) detectors.ReplaceAll("  ", " ");
  while (detectors.BeginsWith(" ")) detectors.Remove(0, 1);
  while (detectors.EndsWith(" ")) detectors.Remove(detectors.Length()-1, 1);

  return result;
}

//_____________________________________________________________________________
Bool_t AliReconstruction::InitRunLoader()
{
// get or create the run loader

  if (gAlice) delete gAlice;
  gAlice = NULL;

  if (!gSystem->AccessPathName(fGAliceFileName.Data())) { // galice.root exists
    // load all base libraries to get the loader classes
    TString libs = gSystem->GetLibraries();
    for (Int_t iDet = 0; iDet < fgkNDetectors; iDet++) {
      TString detName = fgkDetectorName[iDet];
      if (detName == "HLT") continue;
      if (libs.Contains("lib" + detName + "base.so")) continue;
      gSystem->Load("lib" + detName + "base.so");
    }
    fRunLoader = AliRunLoader::Open(fGAliceFileName.Data());
    if (!fRunLoader) {
      AliError(Form("no run loader found in file %s", fGAliceFileName.Data()));
      CleanUp();
      return kFALSE;
    }
    fRunLoader->CdGAFile();
    if (gFile->GetKey(AliRunLoader::GetGAliceName())) {
      if (fRunLoader->LoadgAlice() == 0) {
	gAlice = fRunLoader->GetAliRun();
	AliTracker::SetFieldMap(gAlice->Field(),fUniformField);
      }
    }
    if (!gAlice && !fRawReader) {
      AliError(Form("no gAlice object found in file %s",
		    fGAliceFileName.Data()));
      CleanUp();
      return kFALSE;
    }

  } else {               // galice.root does not exist
    if (!fRawReader) {
      AliError(Form("the file %s does not exist", fGAliceFileName.Data()));
      CleanUp();
      return kFALSE;
    }
    fRunLoader = AliRunLoader::Open(fGAliceFileName.Data(),
				    AliConfig::GetDefaultEventFolderName(),
				    "recreate");
    if (!fRunLoader) {
      AliError(Form("could not create run loader in file %s", 
		    fGAliceFileName.Data()));
      CleanUp();
      return kFALSE;
    }
    fRunLoader->MakeTree("E");
    Int_t iEvent = 0;
    while (fRawReader->NextEvent()) {
      fRunLoader->SetEventNumber(iEvent);
      fRunLoader->GetHeader()->Reset(fRawReader->GetRunNumber(), 
				     iEvent, iEvent);
      fRunLoader->MakeTree("H");
      fRunLoader->TreeE()->Fill();
      iEvent++;
    }
    fRawReader->RewindEvents();
    fRunLoader->WriteHeader("OVERWRITE");
    fRunLoader->CdGAFile();
    fRunLoader->Write(0, TObject::kOverwrite);
//    AliTracker::SetFieldMap(???);
  }

  return kTRUE;
}

//_____________________________________________________________________________
AliReconstructor* AliReconstruction::GetReconstructor(Int_t iDet)
{
// get the reconstructor object and the loader for a detector

  if (fReconstructor[iDet]) return fReconstructor[iDet];

  // load the reconstructor object
  TPluginManager* pluginManager = gROOT->GetPluginManager();
  TString detName = fgkDetectorName[iDet];
  TString recName = "Ali" + detName + "Reconstructor";
  if (gAlice && !gAlice->GetDetector(detName) && (detName != "HLT")) return NULL;

  if (detName == "HLT") {
    if (!gROOT->GetClass("AliLevel3")) {
      gSystem->Load("libAliL3Src.so");
      gSystem->Load("libAliL3Misc.so");
      gSystem->Load("libAliL3Hough.so");
      gSystem->Load("libAliL3Comp.so");
    }
  }

  AliReconstructor* reconstructor = NULL;
  // first check if a plugin is defined for the reconstructor
  TPluginHandler* pluginHandler = 
    pluginManager->FindHandler("AliReconstructor", detName);
  // if not, add a plugin for it
  if (!pluginHandler) {
    AliDebug(1, Form("defining plugin for %s", recName.Data()));
    TString libs = gSystem->GetLibraries();
    if (libs.Contains("lib" + detName + "base.so") ||
	(gSystem->Load("lib" + detName + "base.so") >= 0)) {
      pluginManager->AddHandler("AliReconstructor", detName, 
				recName, detName + "rec", recName + "()");
    } else {
      pluginManager->AddHandler("AliReconstructor", detName, 
				recName, detName, recName + "()");
    }
    pluginHandler = pluginManager->FindHandler("AliReconstructor", detName);
  }
  if (pluginHandler && (pluginHandler->LoadPlugin() == 0)) {
    reconstructor = (AliReconstructor*) pluginHandler->ExecPlugin(0);
  }
  if (reconstructor) {
    TObject* obj = fOptions.FindObject(detName.Data());
    if (obj) reconstructor->SetOption(obj->GetTitle());
    reconstructor->Init(fRunLoader);
    fReconstructor[iDet] = reconstructor;
  }

  // get or create the loader
  if (detName != "HLT") {
    fLoader[iDet] = fRunLoader->GetLoader(detName + "Loader");
    if (!fLoader[iDet]) {
      AliConfig::Instance()
	->CreateDetectorFolders(fRunLoader->GetEventFolder(), 
				detName, detName);
      // first check if a plugin is defined for the loader
      TPluginHandler* pluginHandler = 
	pluginManager->FindHandler("AliLoader", detName);
      // if not, add a plugin for it
      if (!pluginHandler) {
	TString loaderName = "Ali" + detName + "Loader";
	AliDebug(1, Form("defining plugin for %s", loaderName.Data()));
	pluginManager->AddHandler("AliLoader", detName, 
				  loaderName, detName + "base", 
				  loaderName + "(const char*, TFolder*)");
	pluginHandler = pluginManager->FindHandler("AliLoader", detName);
      }
      if (pluginHandler && (pluginHandler->LoadPlugin() == 0)) {
	fLoader[iDet] = 
	  (AliLoader*) pluginHandler->ExecPlugin(2, detName.Data(), 
						 fRunLoader->GetEventFolder());
      }
      if (!fLoader[iDet]) {   // use default loader
	fLoader[iDet] = new AliLoader(detName, fRunLoader->GetEventFolder());
      }
      if (!fLoader[iDet]) {
	AliWarning(Form("couldn't get loader for %s", detName.Data()));
	if (fStopOnError) return NULL;
      } else {
	fRunLoader->AddLoader(fLoader[iDet]);
	fRunLoader->CdGAFile();
	if (gFile && !gFile->IsWritable()) gFile->ReOpen("UPDATE");
	fRunLoader->Write(0, TObject::kOverwrite);
      }
    }
  }
      
  return reconstructor;
}

//_____________________________________________________________________________
Bool_t AliReconstruction::CreateVertexer()
{
// create the vertexer

  fVertexer = NULL;
  AliReconstructor* itsReconstructor = GetReconstructor(0);
  if (itsReconstructor) {
    fVertexer = itsReconstructor->CreateVertexer(fRunLoader);
  }
  if (!fVertexer) {
    AliWarning("couldn't create a vertexer for ITS");
    if (fStopOnError) return kFALSE;
  }

  return kTRUE;
}

//_____________________________________________________________________________
Bool_t AliReconstruction::CreateTrackers(const TString& detectors)
{
// create the trackers

  TString detStr = detectors;
  for (Int_t iDet = 0; iDet < fgkNDetectors; iDet++) {
    if (!IsSelected(fgkDetectorName[iDet], detStr)) continue;
    AliReconstructor* reconstructor = GetReconstructor(iDet);
    if (!reconstructor) continue;
    TString detName = fgkDetectorName[iDet];
    if (detName == "HLT") {
      fRunHLTTracking = kTRUE;
      continue;
    }

    fTracker[iDet] = reconstructor->CreateTracker(fRunLoader);
    if (!fTracker[iDet] && (iDet < 7)) {
      AliWarning(Form("couldn't create a tracker for %s", detName.Data()));
      if (fStopOnError) return kFALSE;
    }
  }

  return kTRUE;
}

//_____________________________________________________________________________
void AliReconstruction::CleanUp(TFile* file, TFile* fileOld)
{
// delete trackers and the run loader and close and delete the file

  for (Int_t iDet = 0; iDet < fgkNDetectors; iDet++) {
    delete fReconstructor[iDet];
    fReconstructor[iDet] = NULL;
    fLoader[iDet] = NULL;
    delete fTracker[iDet];
    fTracker[iDet] = NULL;
  }
  delete fVertexer;
  fVertexer = NULL;

  delete fRunLoader;
  fRunLoader = NULL;
  delete fRawReader;
  fRawReader = NULL;

  if (file) {
    file->Close();
    delete file;
  }

  if (fileOld) {
    fileOld->Close();
    delete fileOld;
    gSystem->Unlink("AliESDs.old.root");
  }
}


//_____________________________________________________________________________
Bool_t AliReconstruction::ReadESD(AliESD*& esd, const char* recStep) const
{
// read the ESD event from a file

  if (!esd) return kFALSE;
  char fileName[256];
  sprintf(fileName, "ESD_%d.%d_%s.root", 
	  esd->GetRunNumber(), esd->GetEventNumber(), recStep);
  if (gSystem->AccessPathName(fileName)) return kFALSE;

  AliInfo(Form("reading ESD from file %s", fileName));
  AliDebug(1, Form("reading ESD from file %s", fileName));
  TFile* file = TFile::Open(fileName);
  if (!file || !file->IsOpen()) {
    AliError(Form("opening %s failed", fileName));
    delete file;
    return kFALSE;
  }

  gROOT->cd();
  delete esd;
  esd = (AliESD*) file->Get("ESD");
  file->Close();
  delete file;
  return kTRUE;
}

//_____________________________________________________________________________
void AliReconstruction::WriteESD(AliESD* esd, const char* recStep) const
{
// write the ESD event to a file

  if (!esd) return;
  char fileName[256];
  sprintf(fileName, "ESD_%d.%d_%s.root", 
	  esd->GetRunNumber(), esd->GetEventNumber(), recStep);

  AliDebug(1, Form("writing ESD to file %s", fileName));
  TFile* file = TFile::Open(fileName, "recreate");
  if (!file || !file->IsOpen()) {
    AliError(Form("opening %s failed", fileName));
  } else {
    esd->Write("ESD");
    file->Close();
  }
  delete file;
}




//_____________________________________________________________________________
void AliReconstruction::CreateTag(TFile* file)
{
  /////////////
  //muon code//
  ////////////
  Double_t fMUONMASS = 0.105658369;
  //Variables
  Double_t fX,fY,fZ ;
  Double_t fThetaX, fThetaY, fPyz, fChisquare;
  Double_t fPxRec,fPyRec, fPzRec, fEnergy;
  Int_t fCharge;
  TLorentzVector fEPvector;

  Float_t fZVertexCut = 10.0; 
  Float_t fRhoVertexCut = 2.0; 

  Float_t fLowPtCut = 1.0;
  Float_t fHighPtCut = 3.0;
  Float_t fVeryHighPtCut = 10.0;
  ////////////

  Double_t partFrac[5] = {0.01, 0.01, 0.85, 0.10, 0.05};

  // Creates the tags for all the events in a given ESD file
  Int_t ntrack;
  Int_t nProtons, nKaons, nPions, nMuons, nElectrons;
  Int_t nPos, nNeg, nNeutr;
  Int_t nK0s, nNeutrons, nPi0s, nGamas;
  Int_t nCh1GeV, nCh3GeV, nCh10GeV;
  Int_t nMu1GeV, nMu3GeV, nMu10GeV;
  Int_t nEl1GeV, nEl3GeV, nEl10GeV;
  Float_t maxPt = .0, meanPt = .0, totalP = .0;
  Int_t fVertexflag;
  TString fVertexName("default");

  AliRunTag *tag = new AliRunTag();
  AliEventTag *evTag = new AliEventTag();
  TTree ttag("T","A Tree with event tags");
  TBranch * btag = ttag.Branch("AliTAG", &tag);
  btag->SetCompressionLevel(9);
  
  AliInfo(Form("Creating the tags......."));	
  
  if (!file || !file->IsOpen()) {
    AliError(Form("opening failed"));
    delete file;
    return ;
  }  
  Int_t firstEvent = 0,lastEvent = 0;
  TTree *t = (TTree*) file->Get("esdTree");
  TBranch * b = t->GetBranch("ESD");
  AliESD *esd = 0;
  b->SetAddress(&esd);
  
  tag->SetRunId(esd->GetRunNumber());
  
  Int_t iNumberOfEvents = b->GetEntries();
  for (Int_t iEventNumber = 0; iEventNumber < iNumberOfEvents; iEventNumber++) {
    ntrack = 0;
    nPos = 0;
    nNeg = 0;
    nNeutr =0;
    nK0s = 0;
    nNeutrons = 0;
    nPi0s = 0;
    nGamas = 0;
    nProtons = 0;
    nKaons = 0;
    nPions = 0;
    nMuons = 0;
    nElectrons = 0;	  
    nCh1GeV = 0;
    nCh3GeV = 0;
    nCh10GeV = 0;
    nMu1GeV = 0;
    nMu3GeV = 0;
    nMu10GeV = 0;
    nEl1GeV = 0;
    nEl3GeV = 0;
    nEl10GeV = 0;
    maxPt = .0;
    meanPt = .0;
    totalP = .0;
    fVertexflag = 0;

    b->GetEntry(iEventNumber);
    const AliESDVertex * vertexIn = esd->GetVertex();
    if (!vertexIn) AliError("ESD has not defined vertex.");
    if (vertexIn) fVertexName = vertexIn->GetName();
    if(fVertexName != "default") fVertexflag = 1;
    for (Int_t iTrackNumber = 0; iTrackNumber < esd->GetNumberOfTracks(); iTrackNumber++) {
      AliESDtrack * esdTrack = esd->GetTrack(iTrackNumber);
      UInt_t status = esdTrack->GetStatus();
      
      //select only tracks with ITS refit
      if ((status&AliESDtrack::kITSrefit)==0) continue;
      //select only tracks with TPC refit
      if ((status&AliESDtrack::kTPCrefit)==0) continue;
      
      //select only tracks with the "combined PID"
      if ((status&AliESDtrack::kESDpid)==0) continue;
      Double_t p[3];
      esdTrack->GetPxPyPz(p);
      Double_t momentum = sqrt(pow(p[0],2) + pow(p[1],2) + pow(p[2],2));
      Double_t fPt = sqrt(pow(p[0],2) + pow(p[1],2));
      totalP += momentum;
      meanPt += fPt;
      if(fPt > maxPt) maxPt = fPt;
      
      if(esdTrack->GetSign() > 0) {
	nPos++;
	if(fPt > fLowPtCut) nCh1GeV++;
	if(fPt > fHighPtCut) nCh3GeV++;
	if(fPt > fVeryHighPtCut) nCh10GeV++;
      }
      if(esdTrack->GetSign() < 0) {
	nNeg++;
	if(fPt > fLowPtCut) nCh1GeV++;
	if(fPt > fHighPtCut) nCh3GeV++;
	if(fPt > fVeryHighPtCut) nCh10GeV++;
      }
      if(esdTrack->GetSign() == 0) nNeutr++;
      
      //PID
      Double_t prob[5];
      esdTrack->GetESDpid(prob);
      
      Double_t rcc = 0.0;
      for(Int_t i = 0; i < AliPID::kSPECIES; i++) rcc += prob[i]*partFrac[i];
      if(rcc == 0.0) continue;
      //Bayes' formula
      Double_t w[5];
      for(Int_t i = 0; i < AliPID::kSPECIES; i++) w[i] = prob[i]*partFrac[i]/rcc;
      
      //protons
      if ((w[4]>w[3])&&(w[4]>w[2])&&(w[4]>w[1])&&(w[4]>w[0])) nProtons++;
      //kaons
      if ((w[3]>w[4])&&(w[3]>w[2])&&(w[3]>w[1])&&(w[3]>w[0])) nKaons++;
      //pions
      if ((w[2]>w[4])&&(w[2]>w[3])&&(w[2]>w[1])&&(w[2]>w[0])) nPions++; 
      //electrons
      if ((w[0]>w[4])&&(w[0]>w[3])&&(w[0]>w[2])&&(w[0]>w[1])) {
	nElectrons++;
	if(fPt > fLowPtCut) nEl1GeV++;
	if(fPt > fHighPtCut) nEl3GeV++;
	if(fPt > fVeryHighPtCut) nEl10GeV++;
      }	  
      ntrack++;
    }//track loop
    
    /////////////
    //muon code//
    ////////////
    Int_t nMuonTracks = esd->GetNumberOfMuonTracks();
    // loop over all reconstructed tracks (also first track of combination)
    for (Int_t iTrack = 0; iTrack <  nMuonTracks;  iTrack++) {
      AliESDMuonTrack* muonTrack = esd->GetMuonTrack(iTrack);
      if (muonTrack == 0x0) continue;
      
      // Coordinates at vertex
      fZ = muonTrack->GetZ(); 
      fY = muonTrack->GetBendingCoor();
      fX = muonTrack->GetNonBendingCoor(); 
      
      fThetaX = muonTrack->GetThetaX();
      fThetaY = muonTrack->GetThetaY();
      
      fPyz = 1./TMath::Abs(muonTrack->GetInverseBendingMomentum());
      fPzRec = - fPyz / TMath::Sqrt(1.0 + TMath::Tan(fThetaY)*TMath::Tan(fThetaY));
      fPxRec = fPzRec * TMath::Tan(fThetaX);
      fPyRec = fPzRec * TMath::Tan(fThetaY);
      fCharge = Int_t(TMath::Sign(1.,muonTrack->GetInverseBendingMomentum()));
      
      //ChiSquare of the track if needed
      fChisquare = muonTrack->GetChi2()/(2.0 * muonTrack->GetNHit() - 5);
      fEnergy = TMath::Sqrt(fMUONMASS * fMUONMASS + fPxRec * fPxRec + fPyRec * fPyRec + fPzRec * fPzRec);
      fEPvector.SetPxPyPzE(fPxRec, fPyRec, fPzRec, fEnergy);
      
      // total number of muons inside a vertex cut 
      if((TMath::Abs(fZ)<fZVertexCut) && (TMath::Sqrt(fY*fY+fX*fX)<fRhoVertexCut)) {
	nMuons++;
	if(fEPvector.Pt() > fLowPtCut) {
	  nMu1GeV++; 
	  if(fEPvector.Pt() > fHighPtCut) {
	    nMu3GeV++; 
	    if (fEPvector.Pt() > fVeryHighPtCut) {
	      nMu10GeV++;
	    }
	  }
	}
      }
    }//muon track loop
    
    // Fill the event tags 
    if(ntrack != 0)
      meanPt = meanPt/ntrack;
    
    evTag->SetEventId(iEventNumber+1);
    if (vertexIn) {
      evTag->SetVertexX(vertexIn->GetXv());
      evTag->SetVertexY(vertexIn->GetYv());
      evTag->SetVertexZ(vertexIn->GetZv());
      evTag->SetVertexZError(vertexIn->GetZRes());
    }  
    evTag->SetVertexFlag(fVertexflag);

    evTag->SetT0VertexZ(esd->GetT0zVertex());
    
    evTag->SetTriggerMask(esd->GetTriggerMask());
    evTag->SetTriggerCluster(esd->GetTriggerCluster());
    
    evTag->SetZDCNeutron1Energy(esd->GetZDCN1Energy());
    evTag->SetZDCProton1Energy(esd->GetZDCP1Energy());
    evTag->SetZDCNeutron2Energy(esd->GetZDCN2Energy());
    evTag->SetZDCProton2Energy(esd->GetZDCP2Energy());
    evTag->SetZDCEMEnergy(esd->GetZDCEMEnergy());
    evTag->SetNumOfParticipants(esd->GetZDCParticipants());
    
    
    evTag->SetNumOfTracks(esd->GetNumberOfTracks());
    evTag->SetNumOfPosTracks(nPos);
    evTag->SetNumOfNegTracks(nNeg);
    evTag->SetNumOfNeutrTracks(nNeutr);
    
    evTag->SetNumOfV0s(esd->GetNumberOfV0s());
    evTag->SetNumOfCascades(esd->GetNumberOfCascades());
    evTag->SetNumOfKinks(esd->GetNumberOfKinks());
    evTag->SetNumOfPMDTracks(esd->GetNumberOfPmdTracks());
    
    evTag->SetNumOfProtons(nProtons);
    evTag->SetNumOfKaons(nKaons);
    evTag->SetNumOfPions(nPions);
    evTag->SetNumOfMuons(nMuons);
    evTag->SetNumOfElectrons(nElectrons);
    evTag->SetNumOfPhotons(nGamas);
    evTag->SetNumOfPi0s(nPi0s);
    evTag->SetNumOfNeutrons(nNeutrons);
    evTag->SetNumOfKaon0s(nK0s);
    
    evTag->SetNumOfChargedAbove1GeV(nCh1GeV);
    evTag->SetNumOfChargedAbove3GeV(nCh3GeV);
    evTag->SetNumOfChargedAbove10GeV(nCh10GeV);
    evTag->SetNumOfMuonsAbove1GeV(nMu1GeV);
    evTag->SetNumOfMuonsAbove3GeV(nMu3GeV);
    evTag->SetNumOfMuonsAbove10GeV(nMu10GeV);
    evTag->SetNumOfElectronsAbove1GeV(nEl1GeV);
    evTag->SetNumOfElectronsAbove3GeV(nEl3GeV);
    evTag->SetNumOfElectronsAbove10GeV(nEl10GeV);
    
    evTag->SetNumOfPHOSClusters(esd->GetNumberOfPHOSClusters());
    evTag->SetNumOfEMCALClusters(esd->GetNumberOfEMCALClusters());
    
    evTag->SetTotalMomentum(totalP);
    evTag->SetMeanPt(meanPt);
    evTag->SetMaxPt(maxPt);
    
    tag->AddEventTag(*evTag);
  }
  lastEvent = iNumberOfEvents;
	
  ttag.Fill();
  tag->Clear();

  char fileName[256];
  sprintf(fileName, "Run%d.Event%d_%d.ESD.tag.root", 
	  tag->GetRunId(),firstEvent,lastEvent );
  AliInfo(Form("writing tags to file %s", fileName));
  AliDebug(1, Form("writing tags to file %s", fileName));
 
  TFile* ftag = TFile::Open(fileName, "recreate");
  ftag->cd();
  ttag.Write();
  ftag->Close();
  file->cd();
  delete tag;
  delete evTag;
}

void AliReconstruction::WriteAlignmentData(AliESD* esd)
{
  // Write space-points which are then used in the alignment procedures
  // For the moment only ITS, TRD and TPC

  // Load TOF clusters
  if (fTracker[3]){
    fLoader[3]->LoadRecPoints("read");
    TTree* tree = fLoader[3]->TreeR();
    if (!tree) {
      AliError(Form("Can't get the %s cluster tree", fgkDetectorName[3]));
      return;
    }
    fTracker[3]->LoadClusters(tree);
  }
  Int_t ntracks = esd->GetNumberOfTracks();
  for (Int_t itrack = 0; itrack < ntracks; itrack++)
    {
      AliESDtrack *track = esd->GetTrack(itrack);
      Int_t nsp = 0;
      Int_t idx[200];
      for (Int_t iDet = 3; iDet >= 0; iDet--)
	nsp += track->GetNcls(iDet);
      if (nsp) {
	AliTrackPointArray *sp = new AliTrackPointArray(nsp);
	track->SetTrackPointArray(sp);
	Int_t isptrack = 0;
	for (Int_t iDet = 3; iDet >= 0; iDet--) {
	  AliTracker *tracker = fTracker[iDet];
	  if (!tracker) continue;
	  Int_t nspdet = track->GetNcls(iDet);
	  if (nspdet <= 0) continue;
	  track->GetClusters(iDet,idx);
	  AliTrackPoint p;
	  Int_t isp = 0;
	  Int_t isp2 = 0;
	  while (isp < nspdet) {
	    Bool_t isvalid = tracker->GetTrackPoint(idx[isp2],p); isp2++;
	    const Int_t kNTPCmax = 159;
	    if (iDet==1 && isp2>kNTPCmax) break;   // to be fixed
	    if (!isvalid) continue;
	    sp->AddPoint(isptrack,&p); isptrack++; isp++;
	  }
	}	
      }
    }
  if (fTracker[3]){
    fTracker[3]->UnloadClusters();
    fLoader[3]->UnloadRecPoints();
  }
}