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[u/mrichter/AliRoot.git] / ANALYSIS / AliAnalysisTaskSE.cxx
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 #include <TROOT.h>
19 #include <TSystem.h>
20 #include <TInterpreter.h>
21 #include <TChain.h>
22 #include <TFile.h>
23 #include <TList.h>
24
25 #include "AliAnalysisTaskSE.h"
26 #include "AliAnalysisManager.h"
27 #include "AliAnalysisCuts.h"
28 #include "AliAnalysisDataSlot.h"
29 #include "AliAnalysisDataContainer.h"
30
31 #include "AliESDEvent.h"
32 #include "AliESDfriend.h"
33 #include "AliESD.h"
34 #include "AliAODEvent.h"
35 #include "AliAODHeader.h"
36 #include "AliAODTracklets.h"
37 #include "AliAODCaloCells.h"
38 #include "AliAODMCParticle.h"
39 #include "AliVEvent.h"
40 #include "AliAODHandler.h"
41 #include "AliAODInputHandler.h"
42 #include "AliMCEventHandler.h"
43 #include "AliInputEventHandler.h"
44 #include "AliMultiInputEventHandler.h"
45 #include "AliESDInputHandler.h"
46 #include "AliMCEvent.h"
47 #include "AliStack.h"
48 #include "AliLog.h"
49 #include "AliAODDimuon.h"
50
51
52 ClassImp(AliAnalysisTaskSE)
53
54 ////////////////////////////////////////////////////////////////////////
55 AliAODHeader*    AliAnalysisTaskSE::fgAODHeader         = NULL;
56 TClonesArray*    AliAnalysisTaskSE::fgAODTracks         = NULL;
57 TClonesArray*    AliAnalysisTaskSE::fgAODVertices       = NULL;
58 TClonesArray*    AliAnalysisTaskSE::fgAODV0s            = NULL;
59 TClonesArray*    AliAnalysisTaskSE::fgAODPMDClusters    = NULL;
60 TClonesArray*    AliAnalysisTaskSE::fgAODJets           = NULL;
61 TClonesArray*    AliAnalysisTaskSE::fgAODFMDClusters    = NULL;
62 TClonesArray*    AliAnalysisTaskSE::fgAODCaloClusters   = NULL;
63 TClonesArray*    AliAnalysisTaskSE::fgAODMCParticles    = NULL;
64 AliAODTracklets* AliAnalysisTaskSE::fgAODTracklets      = NULL;
65 AliAODCaloCells* AliAnalysisTaskSE::fgAODEmcalCells     = NULL;
66 AliAODCaloCells* AliAnalysisTaskSE::fgAODPhosCells      = NULL;
67 TClonesArray*    AliAnalysisTaskSE::fgAODDimuons        = NULL;
68
69 AliAnalysisTaskSE::AliAnalysisTaskSE():
70     AliAnalysisTask(),
71     fDebug(0),
72     fEntry(0),
73     fInputEvent(0x0),
74     fESDfriend(0x0),
75     fInputHandler(0x0),
76     fOutputAOD(0x0),
77     fMCEvent(0x0),
78     fTreeA(0x0),
79     fCurrentRunNumber(-1),
80     fHistosQA(0x0),
81     fOfflineTriggerMask(0),
82     fMultiInputHandler(0),
83     fMCEventHandler(0)
84 {
85   // Default constructor
86 }
87
88 AliAnalysisTaskSE::AliAnalysisTaskSE(const char* name):
89     AliAnalysisTask(name, "AnalysisTaskSE"),
90     fDebug(0),
91     fEntry(0),
92     fInputEvent(0x0),
93     fESDfriend(0x0),
94     fInputHandler(0x0),
95     fOutputAOD(0x0),
96     fMCEvent(0x0),
97     fTreeA(0x0),
98     fCurrentRunNumber(-1),
99     fHistosQA(0x0),
100     fOfflineTriggerMask(0),
101     fMultiInputHandler(0),
102     fMCEventHandler(0)
103 {
104   // Default constructor
105     DefineInput (0, TChain::Class());
106     DefineOutput(0,  TTree::Class());
107 }
108
109 AliAnalysisTaskSE::AliAnalysisTaskSE(const AliAnalysisTaskSE& obj):
110     AliAnalysisTask(obj),
111     fDebug(0),
112     fEntry(0),
113     fInputEvent(0x0),
114     fESDfriend(0x0),
115     fInputHandler(0x0),
116     fOutputAOD(0x0),
117     fMCEvent(0x0),
118     fTreeA(0x0),
119     fCurrentRunNumber(-1),
120     fHistosQA(0x0),
121     fOfflineTriggerMask(0),
122     fMultiInputHandler(obj.fMultiInputHandler),
123     fMCEventHandler(obj.fMCEventHandler)
124 {
125 // Copy constructor
126     fDebug            = obj.fDebug;
127     fEntry            = obj.fEntry;
128     fInputEvent       = obj.fInputEvent;
129     fESDfriend        = obj.fESDfriend;
130     fInputHandler     = obj.fInputHandler;
131     fOutputAOD        = obj.fOutputAOD;
132     fMCEvent          = obj.fMCEvent;
133     fTreeA            = obj.fTreeA;    
134     fCurrentRunNumber = obj.fCurrentRunNumber;
135     fHistosQA         = obj.fHistosQA;
136
137 }
138
139
140 AliAnalysisTaskSE& AliAnalysisTaskSE::operator=(const AliAnalysisTaskSE& other)
141 {
142 // Assignment
143     AliAnalysisTask::operator=(other);
144     fDebug            = other.fDebug;
145     fEntry            = other.fEntry;
146     fInputEvent       = other.fInputEvent;
147     fESDfriend        = other.fESDfriend;
148     fInputHandler     = other.fInputHandler;
149     fOutputAOD        = other.fOutputAOD;
150     fMCEvent          = other.fMCEvent;
151     fTreeA            = other.fTreeA;    
152     fCurrentRunNumber = other.fCurrentRunNumber;
153     fHistosQA         = other.fHistosQA;
154     fOfflineTriggerMask = other.fOfflineTriggerMask;
155     fMultiInputHandler  = other.fMultiInputHandler;
156     fMCEventHandler     = other.fMCEventHandler;
157     return *this;
158 }
159
160 //______________________________________________________________________________
161 Bool_t AliAnalysisTaskSE::CheckPostData() const
162 {
163 // Checks if data was posted to all outputs defined by the task. If task does
164 // not have output slots this returns always kTRUE.
165    AliAnalysisDataContainer *coutput;
166    for (Int_t islot=1; islot<fNoutputs; islot++) {
167       coutput = GetOutputSlot(islot)->GetContainer();
168       if (!coutput->GetData()) return kFALSE;
169    }
170    return kTRUE;
171 }
172
173 void AliAnalysisTaskSE::ConnectInputData(Option_t* /*option*/)
174 {
175 // Connect the input data
176     if (fDebug > 1) printf("AnalysisTaskSE::ConnectInputData() \n");
177
178    // Connect input handlers (multi input handler is handled)
179    ConnectMultiHandler();
180
181     if (fInputHandler) {
182         if ((fInputHandler->GetTree())->GetBranch("ESDfriend."))
183             fESDfriend = ((AliESDInputHandler*)fInputHandler)->GetESDfriend();
184
185         fInputEvent = fInputHandler->GetEvent();
186     } else if( fMCEvent ) {
187          AliWarning("No Input Event Handler connected, only MC Truth Event Handler") ; 
188     } else {
189          AliError("No Input Event Handler connected") ; 
190          return ; 
191     }
192     // Disconnect multi handler
193     DisconnectMultiHandler();
194 }
195
196 void AliAnalysisTaskSE::CreateOutputObjects()
197 {
198 // Create the output container
199 //
200 //  Default AOD
201     if (fDebug > 1) printf("AnalysisTaskSE::CreateOutPutData() \n");
202
203     AliAODHandler* handler = dynamic_cast<AliAODHandler*> 
204          ((AliAnalysisManager::GetAnalysisManager())->GetOutputEventHandler());
205     
206     Bool_t merging = kFALSE;
207     AliAODInputHandler* aodIH = static_cast<AliAODInputHandler*>((AliAnalysisManager::GetAnalysisManager())->GetInputEventHandler());
208     if (aodIH) {
209         if (aodIH->GetMergeEvents()) merging = kTRUE;
210     }
211     
212
213     // Check if AOD replication has been required
214     
215     if (handler) {
216         fOutputAOD   = handler->GetAOD();
217         fTreeA = handler->GetTree();
218         if (fOutputAOD && !(handler->IsStandard())) {
219             if ((handler->NeedsHeaderReplication()) && !(fgAODHeader)) 
220                 {
221                  if (fDebug > 1) AliInfo("Replicating header");
222                  fgAODHeader = new AliAODHeader;
223                  handler->AddBranch("AliAODHeader", &fgAODHeader);
224                 }
225             if ((handler->NeedsTracksBranchReplication() || merging) && !(fgAODTracks))      
226             {   
227                 if (fDebug > 1) AliInfo("Replicating track branch\n");
228                 fgAODTracks = new TClonesArray("AliAODTrack",500);
229                 fgAODTracks->SetName("tracks");
230                 handler->AddBranch("TClonesArray", &fgAODTracks);
231             }    
232             if ((handler->NeedsVerticesBranchReplication() || merging) && !(fgAODVertices))
233             {
234                 if (fDebug > 1) AliInfo("Replicating vertices branch\n");
235                 fgAODVertices = new TClonesArray("AliAODVertex",500);
236                 fgAODVertices->SetName("vertices");
237                 handler->AddBranch("TClonesArray", &fgAODVertices);
238             }   
239             if ((handler->NeedsV0sBranchReplication()) && !(fgAODV0s))    
240             {   
241                 if (fDebug > 1) AliInfo("Replicating V0s branch\n");
242                 fgAODV0s = new TClonesArray("AliAODv0",500);
243                 fgAODV0s->SetName("v0s");
244                 handler->AddBranch("TClonesArray", &fgAODV0s);
245             }
246             if ((handler->NeedsTrackletsBranchReplication()) && !(fgAODTracklets))        
247             {   
248                 if (fDebug > 1) AliInfo("Replicating Tracklets branch\n");
249                 fgAODTracklets = new AliAODTracklets("tracklets","tracklets");
250                 handler->AddBranch("AliAODTracklets", &fgAODTracklets);
251             }
252             if ((handler->NeedsPMDClustersBranchReplication()) && !(fgAODPMDClusters))    
253             {   
254                 if (fDebug > 1) AliInfo("Replicating PMDClusters branch\n");
255                 fgAODPMDClusters = new TClonesArray("AliAODPmdCluster",500);
256                 fgAODPMDClusters->SetName("pmdClusters");
257                 handler->AddBranch("TClonesArray", &fgAODPMDClusters);
258             }
259             if ((handler->NeedsJetsBranchReplication() || merging) && !(fgAODJets))       
260             {   
261                 if (fDebug > 1) AliInfo("Replicating Jets branch\n");
262                 fgAODJets = new TClonesArray("AliAODJet",500);
263                 fgAODJets->SetName("jets");
264                 handler->AddBranch("TClonesArray", &fgAODJets);
265             }
266             if ((handler->NeedsFMDClustersBranchReplication()) && !(fgAODFMDClusters))    
267             {   
268                 AliInfo("Replicating FMDClusters branch\n");
269                 fgAODFMDClusters = new TClonesArray("AliAODFmdCluster",500);
270                 fgAODFMDClusters->SetName("fmdClusters");
271                 handler->AddBranch("TClonesArray", &fgAODFMDClusters);
272             }
273             if ((handler->NeedsCaloClustersBranchReplication() || merging) && !(fgAODCaloClusters))       
274             {   
275                 if (fDebug > 1) AliInfo("Replicating CaloClusters branch\n");
276                 fgAODCaloClusters = new TClonesArray("AliAODCaloCluster",500);
277                 fgAODCaloClusters->SetName("caloClusters");
278                 handler->AddBranch("TClonesArray", &fgAODCaloClusters);
279
280                 fgAODEmcalCells = new AliAODCaloCells();
281                 fgAODEmcalCells->SetName("emcalCells");
282                 handler->AddBranch("AliAODCaloCells", &fgAODEmcalCells);
283
284                 fgAODPhosCells = new AliAODCaloCells();
285                 fgAODPhosCells->SetName("phosCells");
286                 handler->AddBranch("AliAODCaloCells", &fgAODPhosCells);
287             }
288             if ((handler->NeedsMCParticlesBranchReplication() || merging) && !(fgAODMCParticles))         
289             {   
290                 if (fDebug > 1) AliInfo("Replicating MCParticles branch\n");
291                 fgAODMCParticles = new TClonesArray("AliAODMCParticle",500);
292                 fgAODMCParticles->SetName("mcparticles");
293                 handler->AddBranch("TClonesArray", &fgAODMCParticles);
294             }
295             if ((handler->NeedsDimuonsBranchReplication() || merging) && !(fgAODDimuons))      
296             {   
297                 if (fDebug > 1) AliInfo("Replicating dimuon branch\n");
298                 fgAODDimuons = new TClonesArray("AliAODDimuon",0);
299                 fgAODDimuons->SetName("dimuons");
300                 handler->AddBranch("TClonesArray", &fgAODDimuons);
301             }    
302
303             // cache the pointerd in the AODEvent
304             fOutputAOD->GetStdContent();
305         }
306     }
307     UserCreateOutputObjects();
308 }
309
310 void AliAnalysisTaskSE::Exec(Option_t* option)
311 {
312 //
313 // Exec analysis of one event
314
315     ConnectMultiHandler();
316
317     if ( fDebug >= 10)
318       printf("Task is active %5d\n", IsActive());
319     
320     if (fDebug > 1) AliInfo("AliAnalysisTaskSE::Exec() \n");
321 //
322     AliAODHandler* handler = dynamic_cast<AliAODHandler*> 
323         ((AliAnalysisManager::GetAnalysisManager())->GetOutputEventHandler());
324
325     AliAODInputHandler* aodH = dynamic_cast<AliAODInputHandler*>(fInputHandler);
326 //
327 // Was event selected ? If no event selection mechanism, the event SHOULD be selected (AG)
328     UInt_t isSelected = AliVEvent::kAny;
329     if( fInputHandler && fInputHandler->GetEventSelection()) {
330       // Get the actual offline trigger mask for the event and AND it with the
331       // requested mask. If no mask requested select by default the event.
332       if (fOfflineTriggerMask)
333          isSelected = fOfflineTriggerMask & fInputHandler->IsEventSelected();
334     }
335 //  Functionality below moved in the filter tasks (AG)
336 //    if (handler) handler->SetFillAOD(isSelected);
337
338     if( fInputHandler ) {
339         fEntry = fInputHandler->GetReadEntry();
340         fESDfriend = ((AliESDInputHandler*)fInputHandler)->GetESDfriend();
341     }
342     
343
344 // Notify the change of run number
345     if (InputEvent() && (InputEvent()->GetRunNumber() != fCurrentRunNumber)) {
346         fCurrentRunNumber = InputEvent()->GetRunNumber();
347         NotifyRun();
348     }    
349            
350     else if( fMCEvent )
351        fEntry = fMCEvent->Header()->GetEvent(); 
352     if ( !((Entry()-1)%100) && fDebug > 0) 
353          AliInfo(Form("%s ----> Processing event # %lld", CurrentFileName(), Entry()));
354
355     
356     
357
358     if (handler && aodH) {
359         fMCEvent = aodH->MCEvent();
360         Bool_t merging = aodH->GetMergeEvents();
361         AliAODEvent* aod = dynamic_cast<AliAODEvent*>(InputEvent());
362
363         if (aod && !(handler->IsStandard()) && !(handler->AODIsReplicated())) {
364             if ((handler->NeedsHeaderReplication()) && (fgAODHeader))
365             {
366               // copy the contents by assigment
367               *fgAODHeader =  *(aod->GetHeader());
368             }
369             if ((handler->NeedsTracksBranchReplication() || merging) && (fgAODTracks))
370             {
371                 TClonesArray* tracks = aod->GetTracks();
372                 new (fgAODTracks) TClonesArray(*tracks);
373             }
374             if ((handler->NeedsVerticesBranchReplication() || merging) && (fgAODVertices))
375             {
376                 TClonesArray* vertices = aod->GetVertices();
377                 new (fgAODVertices) TClonesArray(*vertices);
378             }
379             if ((handler->NeedsV0sBranchReplication()) && (fgAODV0s))
380             {
381                 TClonesArray* v0s = aod->GetV0s();
382                 new (fgAODV0s) TClonesArray(*v0s);
383             }
384             if ((handler->NeedsTrackletsBranchReplication()) && (fgAODTracklets))
385             {
386               *fgAODTracklets = *aod->GetTracklets();
387             }
388             if ((handler->NeedsPMDClustersBranchReplication()) && (fgAODPMDClusters))
389             {
390                 TClonesArray* pmdClusters = aod->GetPmdClusters();
391                 new (fgAODPMDClusters) TClonesArray(*pmdClusters);
392             }
393             if ((handler->NeedsJetsBranchReplication() || merging) && (fgAODJets))
394             {
395                 TClonesArray* jets = aod->GetJets();
396                 new (fgAODJets) TClonesArray(*jets);
397             }
398             if ((handler->NeedsFMDClustersBranchReplication()) && (fgAODFMDClusters))
399             {
400                 TClonesArray* fmdClusters = aod->GetFmdClusters();
401                 new (fgAODFMDClusters) TClonesArray(*fmdClusters);
402             }
403             if ((handler->NeedsCaloClustersBranchReplication() || merging) && (fgAODCaloClusters))
404             {
405                 TClonesArray* caloClusters = aod->GetCaloClusters();
406                 new (fgAODCaloClusters) TClonesArray(*caloClusters);
407             }
408
409             if ((handler->NeedsMCParticlesBranchReplication() || merging) && (fgAODMCParticles))
410             {
411                 TClonesArray* mcParticles = (TClonesArray*) (aod->FindListObject("mcparticles"));
412                 new (fgAODMCParticles) TClonesArray(*mcParticles);
413             }
414             
415             if ((handler->NeedsDimuonsBranchReplication() || merging) && (fgAODDimuons))
416             {
417                 fgAODDimuons->Clear();
418                 TClonesArray& dimuons = *fgAODDimuons;
419                 TClonesArray& tracksnew = *fgAODTracks;
420                 
421                 Int_t nMuonTrack[100]; 
422                 for(Int_t imuon = 0; imuon < 100; imuon++) nMuonTrack[imuon] = 0;
423                 Int_t nMuons=0;
424                 for(Int_t ii=0; ii < fgAODTracks->GetEntries(); ii++){
425                     AliAODTrack *track = (AliAODTrack*) fgAODTracks->At(ii);
426                     if(track->IsMuonTrack()) {
427                         nMuonTrack[nMuons]= ii;
428                         nMuons++;
429                     }  
430                 }
431                 Int_t jDimuons=0;
432                 if(nMuons >= 2){
433                     for(Int_t i = 0; i < nMuons; i++){
434                         Int_t index0 = nMuonTrack[i];
435                         for(Int_t j = i+1; j < nMuons; j++){
436                             Int_t index1 = nMuonTrack[j];
437                             tracksnew.At(index0)->ResetBit(kIsReferenced);
438                             tracksnew.At(index0)->SetUniqueID(0); 
439                             tracksnew.At(index1)->ResetBit(kIsReferenced);
440                             tracksnew.At(index1)->SetUniqueID(0);
441                             new(dimuons[jDimuons++]) AliAODDimuon(tracksnew.At(index0),tracksnew.At(index1));
442                         }
443                     }    
444                 }
445             }
446             
447             // Additional merging if needed
448             if (merging) {
449                 // mcParticles
450                 TClonesArray* mcparticles = (TClonesArray*) ((aodH->GetEventToMerge())->FindListObject("mcparticles"));
451                 Int_t npart = mcparticles->GetEntries();
452                 Int_t nc = fgAODMCParticles->GetEntries();
453                 Int_t nc0 = nc;
454                 
455                 for (Int_t i = 0; i < npart; i++) {
456                     AliAODMCParticle* particle = (AliAODMCParticle*) mcparticles->At(i);
457                     new((*fgAODMCParticles)[nc++]) AliAODMCParticle(*particle);
458                 }
459                 
460                 // tracks
461                 TClonesArray* tracks = aodH->GetEventToMerge()->GetTracks();
462                 Int_t ntr = tracks->GetEntries();
463                 nc  = fgAODTracks->GetEntries();        
464                 for (Int_t i = 0; i < ntr; i++) {
465                     AliAODTrack*    track = (AliAODTrack*) tracks->At(i);
466                     AliAODTrack* newtrack = new((*fgAODTracks)[nc++]) AliAODTrack(*track);
467                     newtrack->SetLabel(newtrack->GetLabel() + nc0);
468                 }
469
470                 for (Int_t i = 0; i < nc; i++) 
471                 {
472                     AliAODTrack* track = (AliAODTrack*) fgAODTracks->At(i);
473                     track->ResetBit(kIsReferenced);
474                     track->SetUniqueID(0);
475                 }
476                 
477                 
478                 // clusters
479                 TClonesArray* clusters = aodH->GetEventToMerge()->GetCaloClusters();
480                 Int_t ncl  = clusters->GetEntries();
481                 nc         =  fgAODCaloClusters->GetEntries();
482                 for (Int_t i = 0; i < ncl; i++) {
483                     AliAODCaloCluster*    cluster = (AliAODCaloCluster*) clusters->At(i);
484                     new((*fgAODCaloClusters)[nc++]) AliAODCaloCluster(*cluster);
485                 }
486                 // cells
487                 AliAODCaloCells* cellsA = aodH->GetEventToMerge()->GetEMCALCells();
488                 Int_t ncells  = cellsA->GetNumberOfCells();
489                 nc = fgAODEmcalCells->GetNumberOfCells();
490                 
491                 for (Int_t i  = 0; i < ncells; i++) {
492                     Int_t cn  = cellsA->GetCellNumber(i);
493                     Int_t pos = fgAODEmcalCells->GetCellPosition(cn);
494                     if (pos >= 0) {
495                         Double_t amp = cellsA->GetAmplitude(i) + fgAODEmcalCells->GetAmplitude(pos);
496                         fgAODEmcalCells->SetCell(pos, cn, amp);
497                     } else {
498                         Double_t amp = cellsA->GetAmplitude(i);
499                         fgAODEmcalCells->SetCell(nc++, cn, amp);
500                         fgAODEmcalCells->Sort();
501                     }
502                 }
503                 
504                 
505             } // merging
506             
507             handler->SetAODIsReplicated();
508         }
509     }
510
511 // Call the user analysis    
512     if (!fMCEventHandler) {
513         if (isSelected) 
514             UserExec(option);
515     } else {
516         if (isSelected && (fMCEventHandler->InitOk())) 
517             UserExec(option);
518     }
519     
520 // Added protection in case the derived task is not an AOD producer.
521     AliAnalysisDataSlot *out0 = GetOutputSlot(0);
522     if (out0 && out0->IsConnected()) PostData(0, fTreeA);    
523     
524     DisconnectMultiHandler();
525 }
526
527 const char* AliAnalysisTaskSE::CurrentFileName()
528 {
529 // Returns the current file name    
530     if( fInputHandler )
531       return fInputHandler->GetTree()->GetCurrentFile()->GetName();
532     else if( fMCEvent )
533       return ((AliMCEventHandler*) ((AliAnalysisManager::GetAnalysisManager())->GetMCtruthEventHandler()))->TreeK()->GetCurrentFile()->GetName();
534     else return "";
535 }
536
537 void AliAnalysisTaskSE::AddAODBranch(const char* cname, void* addobj, const char *fname)
538 {
539     // Add a new branch to the aod tree
540     AliAODHandler* handler = dynamic_cast<AliAODHandler*> 
541         ((AliAnalysisManager::GetAnalysisManager())->GetOutputEventHandler());
542     if (handler) {
543         handler->AddBranch(cname, addobj, fname);
544     }
545 }
546
547 Bool_t AliAnalysisTaskSE::IsStandardAOD() const
548 {
549 // Check if the output AOD handler is configured for standard or delta AOD.
550 // Users should first check that AODEvent() returns non-null.
551     AliAODHandler* handler = dynamic_cast<AliAODHandler*> 
552          ((AliAnalysisManager::GetAnalysisManager())->GetOutputEventHandler());
553     if (!handler) {
554        Error("IsStandardAOD", "No AOD handler. Please use AODEvent() to check this first");
555        return kTRUE;
556     }
557     return handler->IsStandard();   
558 }
559
560 Bool_t AliAnalysisTaskSE::Notify()
561 {
562     return (UserNotify());
563 }
564
565 const AliEventTag *AliAnalysisTaskSE::EventTag() const
566 {
567 // Returns tag for the current event, if any. The return value should always be checked by the user.
568    if (!fInputHandler) {
569       Error("EventTag", "Input handler not yet available. Call this in UserExec");
570       return NULL;
571    }
572    return fInputHandler->GetEventTag();
573 }
574
575 void AliAnalysisTaskSE::LoadBranches() const
576 {
577 // Load all branches declared in fBranchNames data member of the parent class.
578 // Should be called in UserExec.
579   if (!fInputHandler) {
580      Error("LoadBranches", "Input handler not available yet. Call this in UserExec");
581      return;
582   }
583   AliAnalysisManager *mgr = AliAnalysisManager::GetAnalysisManager();
584   if (mgr->GetAutoBranchLoading()) return;
585   TString taskbranches;
586   GetBranches(fInputHandler->GetDataType(), taskbranches);
587   if (taskbranches.IsNull()) return;
588   TObjArray *arr = taskbranches.Tokenize(",");
589   TIter next(arr);
590   TObject *obj;
591   while ((obj=next())) mgr->LoadBranch(obj->GetName());
592 }
593
594
595 //_________________________________________________________________________________________________
596 void AliAnalysisTaskSE::ConnectMultiHandler()
597 {
598    //
599    // Connect MultiHandler
600    //
601    fInputHandler = (AliInputEventHandler *)((AliAnalysisManager::GetAnalysisManager())->GetInputEventHandler());
602    fMultiInputHandler = dynamic_cast<AliMultiInputEventHandler *>(fInputHandler);
603    if (fMultiInputHandler) {
604       fInputHandler = dynamic_cast<AliInputEventHandler *>(fMultiInputHandler->GetFirstInputEventHandler());
605       fMCEventHandler = dynamic_cast<AliMCEventHandler *>(fMultiInputHandler->GetFirstMCEventHandler());
606    } else { 
607       fMCEventHandler = dynamic_cast<AliMCEventHandler *>((AliAnalysisManager::GetAnalysisManager())->GetMCtruthEventHandler());
608    }
609    if (fMCEventHandler) fMCEvent = fMCEventHandler->MCEvent();
610 }
611
612 //_________________________________________________________________________________________________
613 void AliAnalysisTaskSE::DisconnectMultiHandler()
614 {
615    //
616    // Disconnect MultiHandler
617    //
618    if (fMultiInputHandler) fInputHandler = fMultiInputHandler;
619 }