Line data Source code
1 :
2 : /**************************************************************************
3 : * Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
4 : * *
5 : * Author: The ALICE Off-line Project. *
6 : * Contributors are mentioned in the code where appropriate. *
7 : * *
8 : * Permission to use, copy, modify and distribute this software and its *
9 : * documentation strictly for non-commercial purposes is hereby granted *
10 : * without fee, provided that the above copyright notice appears in all *
11 : * copies and that both the copyright notice and this permission notice *
12 : * appear in the supporting documentation. The authors make no claims *
13 : * about the suitability of this software for any purpose. It is *
14 : * provided "as is" without express or implied warranty. *
15 : **************************************************************************/
16 :
17 : /* $Id$ */
18 :
19 : #include "TVectorT.h"
20 : #include "AliLog.h"
21 : #include "AliESDtrack.h"
22 : #include "AliTracker.h"
23 :
24 : #include "AliTRDtrackV1.h"
25 : #include "AliTRDcluster.h"
26 : #include "AliTRDcalibDB.h"
27 : #include "AliTRDReconstructor.h"
28 : #include "AliTRDPIDResponse.h"
29 : #include "AliTRDrecoParam.h"
30 : #include "AliTRDdEdxBaseUtils.h"
31 : #include "AliTRDdEdxCalibHistArray.h"
32 : #include "AliTRDdEdxCalibUtils.h"
33 : #include "AliTRDdEdxReconUtils.h"
34 :
35 48 : ClassImp(AliTRDtrackV1)
36 :
37 : ///////////////////////////////////////////////////////////////////////////////
38 : // //
39 : // Represents a reconstructed TRD track //
40 : // Local TRD Kalman track //
41 : // //
42 : // Authors: //
43 : // Alex Bercuci <A.Bercuci@gsi.de> //
44 : // Markus Fasel <M.Fasel@gsi.de> //
45 : // //
46 : ///////////////////////////////////////////////////////////////////////////////
47 :
48 : //_______________________________________________________________
49 16 : AliTRDtrackV1::AliTRDtrackV1() : AliKalmanTrack()
50 16 : ,fStatus(0)
51 16 : ,fESDid(0)
52 16 : ,fDE(0.)
53 16 : ,fTruncatedMean(0)
54 16 : ,fNchamberdEdx(0)
55 16 : ,fNclusterdEdx(0)
56 16 : ,fNdEdxSlices(0)
57 16 : ,fkReconstructor(NULL)
58 16 : ,fBackupTrack(NULL)
59 16 : ,fTrackLow(NULL)
60 16 : ,fTrackHigh(NULL)
61 80 : {
62 : //
63 : // Default constructor
64 : //
65 : //printf("AliTRDtrackV1::AliTRDtrackV1()\n");
66 :
67 128 : for(int i =0; i<3; i++) fBudget[i] = 0.;
68 :
69 : Float_t pid = 1./AliPID::kSPECIES;
70 192 : for(int is =0; is<AliPID::kSPECIES; is++) fPID[is] = pid;
71 :
72 224 : for(int ip=0; ip<kNplane; ip++){
73 96 : fTrackletIndex[ip] = -1;
74 96 : fTracklet[ip] = NULL;
75 : }
76 16 : SetLabel(-123456789); // reset label
77 32 : }
78 :
79 : //_______________________________________________________________
80 104 : AliTRDtrackV1::AliTRDtrackV1(const AliTRDtrackV1 &ref) : AliKalmanTrack(ref)
81 104 : ,fStatus(ref.fStatus)
82 104 : ,fESDid(ref.fESDid)
83 104 : ,fDE(ref.fDE)
84 104 : ,fTruncatedMean(ref.fTruncatedMean)
85 104 : ,fNchamberdEdx(ref.fNchamberdEdx)
86 104 : ,fNclusterdEdx(ref.fNclusterdEdx)
87 104 : ,fNdEdxSlices(ref.fNdEdxSlices)
88 104 : ,fkReconstructor(ref.fkReconstructor)
89 104 : ,fBackupTrack(NULL)
90 104 : ,fTrackLow(NULL)
91 104 : ,fTrackHigh(NULL)
92 520 : {
93 : //
94 : // Copy constructor
95 : //
96 :
97 : //printf("AliTRDtrackV1::AliTRDtrackV1(const AliTRDtrackV1 &)\n");
98 104 : SetBit(kOwner, kFALSE);
99 1456 : for(int ip=0; ip<kNplane; ip++){
100 624 : fTrackletIndex[ip] = ref.fTrackletIndex[ip];
101 624 : fTracklet[ip] = ref.fTracklet[ip];
102 : }
103 230 : if(ref.fTrackLow) fTrackLow = new AliExternalTrackParam(*ref.fTrackLow);
104 104 : if(ref.fTrackHigh) fTrackHigh = new AliExternalTrackParam(*ref.fTrackHigh);
105 :
106 832 : for (Int_t i = 0; i < 3;i++) fBudget[i] = ref.fBudget[i];
107 :
108 1248 : for(Int_t is = 0; is<AliPID::kSPECIES; is++) fPID[is] = ref.fPID[is];
109 :
110 208 : AliKalmanTrack::SetNumberOfClusters(ref.GetNumberOfClusters());
111 208 : }
112 :
113 : //_______________________________________________________________
114 286 : AliTRDtrackV1::AliTRDtrackV1(const AliESDtrack &t) : AliKalmanTrack()
115 286 : ,fStatus(0)
116 286 : ,fESDid(0)
117 286 : ,fDE(0.)
118 286 : ,fTruncatedMean(0)
119 286 : ,fNchamberdEdx(0)
120 286 : ,fNclusterdEdx(0)
121 286 : ,fNdEdxSlices(0)
122 286 : ,fkReconstructor(NULL)
123 286 : ,fBackupTrack(NULL)
124 286 : ,fTrackLow(NULL)
125 286 : ,fTrackHigh(NULL)
126 1430 : {
127 : //
128 : // Constructor from AliESDtrack
129 : //
130 :
131 572 : SetESDid(t.GetID());
132 572 : SetLabel(t.GetLabel());
133 286 : SetChi2(0.0);
134 :
135 572 : SetMass(t.GetMassForTracking());
136 572 : AliKalmanTrack::SetNumberOfClusters(t.GetTRDncls());
137 286 : Int_t ti[]={-1, -1, -1, -1, -1, -1}; t.GetTRDtracklets(&ti[0]);
138 4004 : for(int ip=0; ip<kNplane; ip++){
139 1716 : fTrackletIndex[ip] = ti[ip];
140 1716 : fTracklet[ip] = NULL;
141 : }
142 2288 : for(int i =0; i<3; i++) fBudget[i] = 0.;
143 :
144 : Float_t pid = 1./AliPID::kSPECIES;
145 3432 : for(int is =0; is<AliPID::kSPECIES; is++) fPID[is] = pid;
146 :
147 286 : const AliExternalTrackParam *par = &t;
148 : /* RS
149 : if (t.GetStatus() & AliESDtrack::kTRDbackup) {
150 : par = t.GetOuterParam();
151 : if (!par) {
152 : AliError("No backup info!");
153 : par = &t;
154 : }
155 : }
156 : */
157 572 : Set(par->GetX()
158 286 : ,par->GetAlpha()
159 286 : ,par->GetParameter()
160 286 : ,par->GetCovariance());
161 :
162 572 : if(t.GetStatus() & AliESDtrack::kTIME) {
163 286 : StartTimeIntegral();
164 286 : Double_t times[AliPID::kSPECIESC];
165 286 : t.GetIntegratedTimes(times,AliPID::kSPECIESC);
166 286 : SetIntegratedTimes(times);
167 572 : SetIntegratedLength(t.GetIntegratedLength());
168 286 : }
169 572 : }
170 :
171 : //_______________________________________________________________
172 : AliTRDtrackV1::AliTRDtrackV1(AliTRDseedV1 * const trklts, const Double_t p[5], const Double_t cov[15]
173 0 : , Double_t x, Double_t alpha) : AliKalmanTrack()
174 0 : ,fStatus(0)
175 0 : ,fESDid(0)
176 0 : ,fDE(0.)
177 0 : ,fTruncatedMean(0)
178 0 : ,fNchamberdEdx(0)
179 0 : ,fNclusterdEdx(0)
180 0 : ,fNdEdxSlices(0)
181 0 : ,fkReconstructor(NULL)
182 0 : ,fBackupTrack(NULL)
183 0 : ,fTrackLow(NULL)
184 0 : ,fTrackHigh(NULL)
185 0 : {
186 : //
187 : // The stand alone tracking constructor
188 : // TEMPORARY !!!!!!!!!!!
189 : // to check :
190 : // 1. covariance matrix
191 : // 2. dQdl calculation
192 : //
193 :
194 0 : Double_t b(GetBz());
195 0 : Double_t cnv = (TMath::Abs(b) < 1.e-5) ? 1.e5 : 1./GetBz()/kB2C;
196 :
197 0 : Double_t pp[5] = { p[0]
198 0 : , p[1]
199 0 : , p[2]
200 0 : , p[3]
201 0 : , p[4]*cnv };
202 :
203 0 : Double_t c22 = x*x*cov[14] - 2*x*cov[12] + cov[ 5];
204 0 : Double_t c32 = x*cov[13] - cov[ 8];
205 0 : Double_t c20 = x*cov[10] - cov[ 3];
206 0 : Double_t c21 = x*cov[11] - cov[ 4];
207 0 : Double_t c42 = x*cov[14] - cov[12];
208 :
209 0 : Double_t cc[15] = { cov[ 0]
210 0 : , cov[ 1], cov[ 2]
211 : , c20, c21, c22
212 0 : , cov[ 6], cov[ 7], c32, cov[ 9]
213 0 : , cov[10]*cnv, cov[11]*cnv, c42*cnv, cov[13]*cnv, cov[14]*cnv*cnv };
214 :
215 0 : Double_t mostProbablePt=AliExternalTrackParam::GetMostProbablePt();
216 0 : Double_t p0=TMath::Sign(1/mostProbablePt,pp[4]);
217 0 : Double_t w0=cc[14]/(cc[14] + p0*p0), w1=p0*p0/(cc[14] + p0*p0);
218 0 : AliDebug(3, Form("Pt mixing : w0[%4.2f] pt0[%5.3f] w1[%4.2f] pt[%5.3f]", w0, 1./p0, w1, 1./pp[4]));
219 :
220 0 : pp[4] = w0*p0 + w1*pp[4];
221 0 : cc[10]*=w1; cc[11]*=w1; cc[12]*=w1; cc[13]*=w1; cc[14]*=w1;
222 0 : Set(x,alpha,pp,cc);
223 0 : AliDebug(2, Form("Init @ x[%6.2f] pt[%5.3f]", x, 1./pp[4]));
224 : Int_t ncls = 0;
225 0 : for(int iplane=0; iplane<kNplane; iplane++){
226 0 : fTrackletIndex[iplane] = -1;
227 0 : if(!trklts[iplane].IsOK()) fTracklet[iplane] = NULL;
228 : else{
229 0 : fTracklet[iplane] = &trklts[iplane];
230 0 : ncls += fTracklet[iplane]->GetN();
231 : }
232 : }
233 0 : AliKalmanTrack::SetNumberOfClusters(ncls);
234 0 : for(int i =0; i<3; i++) fBudget[i] = 0.;
235 :
236 : Float_t pid = 1./AliPID::kSPECIES;
237 0 : for(int is =0; is<AliPID::kSPECIES; is++) fPID[is] = pid;
238 0 : SetLabel(-123456789); // reset label
239 0 : }
240 :
241 : //_______________________________________________________________
242 : AliTRDtrackV1::~AliTRDtrackV1()
243 1224 : {
244 : // Clean up all objects allocated by the track during its lifetime.
245 1270 : AliDebug(2, Form("Deleting track[%d]\n fBackupTrack[%p] fTrackLow[%p] fTrackHigh[%p] Owner[%c].", fESDid, (void*)fBackupTrack, (void*)fTrackLow, (void*)fTrackHigh, TestBit(kOwner)?'y':'n'));
246 :
247 508 : if(fBackupTrack) delete fBackupTrack; fBackupTrack = NULL;
248 :
249 676 : if(fTrackLow) delete fTrackLow; fTrackLow = NULL;
250 592 : if(fTrackHigh) delete fTrackHigh; fTrackHigh = NULL;
251 :
252 3556 : for(Int_t ip=0; ip<kNplane; ip++){
253 2560 : if(TestBit(kOwner) && fTracklet[ip]) delete fTracklet[ip];
254 1524 : fTracklet[ip] = NULL;
255 1524 : fTrackletIndex[ip] = -1;
256 : }
257 612 : }
258 :
259 : //_______________________________________________________________
260 : AliTRDtrackV1 &AliTRDtrackV1::operator=(const AliTRDtrackV1 &t)
261 : {
262 : //
263 : // Assignment operator
264 : //
265 :
266 0 : if (this != &t) {
267 0 : AliKalmanTrack::operator=(t);
268 0 : ((AliTRDtrackV1 &) t).Copy(*this);
269 0 : }
270 :
271 0 : return *this;
272 :
273 : }
274 :
275 : //_____________________________________________________________________________
276 : void AliTRDtrackV1::Copy(TObject &t) const
277 : {
278 : //
279 : // Copy function
280 : //
281 :
282 0 : ((AliTRDtrackV1 &) t).fStatus = fStatus;
283 0 : ((AliTRDtrackV1 &) t).fESDid = fESDid;
284 0 : ((AliTRDtrackV1 &) t).fDE = fDE;
285 0 : ((AliTRDtrackV1 &) t).fkReconstructor = fkReconstructor;
286 0 : ((AliTRDtrackV1 &) t).fBackupTrack = 0x0;
287 0 : ((AliTRDtrackV1 &) t).fTrackLow = 0x0;
288 0 : ((AliTRDtrackV1 &) t).fTrackHigh = 0x0;
289 :
290 0 : for(Int_t ip = 0; ip < kNplane; ip++) {
291 0 : ((AliTRDtrackV1 &) t).fTrackletIndex[ip] = fTrackletIndex[ip];
292 0 : ((AliTRDtrackV1 &) t).fTracklet[ip] = fTracklet[ip];
293 : }
294 0 : if (fTrackLow) {
295 0 : ((AliTRDtrackV1 &) t).fTrackLow = new AliExternalTrackParam(*fTrackLow);
296 0 : }
297 0 : if (fTrackHigh){
298 0 : ((AliTRDtrackV1 &) t).fTrackHigh = new AliExternalTrackParam(*fTrackHigh);
299 0 : }
300 :
301 0 : for (Int_t i = 0; i < 3; i++) {
302 0 : ((AliTRDtrackV1 &) t).fBudget[i] = fBudget[i];
303 : }
304 0 : for (Int_t is = 0; is < AliPID::kSPECIES; is++) {
305 0 : ((AliTRDtrackV1 &) t).fPID[is] = fPID[is];
306 : }
307 :
308 0 : }
309 :
310 : //_______________________________________________________________
311 : Int_t AliTRDtrackV1::CookLabel(Float_t wrong, Int_t *labs, Float_t *freq)
312 : {
313 : // Set MC label for this track
314 : // On demand i.e. if arrays "labs" and "freq" are allocated by user returns :
315 : // nlabs = the no of distinct labels
316 : // labs = array of distinct labels in decreasing order of frequency
317 : // freq = frequency of each label in decreasing order
318 :
319 : Int_t ncl(0);
320 270 : if(!(ncl = GetNumberOfClusters())) return 0;
321 :
322 42 : Int_t s[2][kMAXCLUSTERSPERTRACK];
323 17724 : for (Int_t i = 0; i < kMAXCLUSTERSPERTRACK; i++) {
324 8820 : s[0][i] = -1;
325 8820 : s[1][i] = 0;
326 : }
327 :
328 : Int_t label(-123456789), nlabels(0);
329 : AliTRDcluster *c(NULL);
330 588 : for (Int_t ip(0); ip < AliTRDgeometry::kNlayer; ip++) {
331 458 : if(fTrackletIndex[ip]<0 || !fTracklet[ip]) continue;
332 25956 : for (Int_t ic(0); ic < AliTRDseedV1::kNclusters; ic++) {
333 12772 : if(!(c = fTracklet[ip]->GetClusters(ic))) continue;
334 35840 : for (Int_t k(0); k < 3; k++) {
335 13440 : if ((label = c->GetLabel(k)) < 0) continue;
336 : Int_t j(0);
337 92569 : while(j < kMAXCLUSTERSPERTRACK){
338 233345 : if(s[0][j]!=label && s[1][j]!=0){j++; continue;}
339 9680 : if(!s[1][j]) nlabels++;
340 9007 : s[0][j] = label; s[1][j]++;
341 9007 : break;
342 : }
343 9007 : }
344 4480 : }
345 206 : }
346 : //printf(" Found %4d labels\n", nlabels);
347 : Float_t prob(1.);
348 42 : if(!nlabels){
349 0 : AliError(Form("No MC labels found for track %d.", fESDid));
350 0 : return 0;
351 42 : } else if(nlabels==1) {
352 6 : label = s[0][0];
353 6 : if(labs && freq){labs[0]=label; freq[0]=1.;}
354 : } else {
355 36 : Int_t idx[kMAXCLUSTERSPERTRACK];
356 36 : TMath::Sort(nlabels, s[1], idx);
357 36 : label = s[0][idx[0]]; prob = s[1][idx[0]]/Float_t(ncl);
358 36 : if(labs && freq){
359 0 : for (Int_t i(0); i<nlabels; i++){
360 0 : labs[i] = s[0][idx[i]];
361 0 : freq[i] = s[1][idx[i]]/Float_t(ncl);
362 : }
363 0 : }
364 36 : }
365 42 : SetLabel((1.-prob > wrong)?-label:label);
366 42 : return nlabels;
367 146 : }
368 :
369 : //_______________________________________________________________
370 : Bool_t AliTRDtrackV1::CookPID()
371 : {
372 : //
373 : // Cook the PID information for the track by delegating the omonim function of the tracklets.
374 : // Computes the number of tracklets used. The tracklet information are considered independent.
375 : // For the moment no global track measurement of PID is performed as for example to estimate
376 : // bremsstrahlung probability based on global chi2 of the track.
377 : //
378 : // The status bit AliESDtrack::kTRDpid is set during the call of AliTRDtrackV1::UpdateESDtrack().The PID performance of the
379 : //TRD for tracks with 6 tacklets is displayed below.
380 : //Begin_Html
381 : //<img src="TRD/trackPID.gif">
382 : //End_Html
383 : //
384 208 : const AliTRDPIDResponse *pidResponse = AliTRDcalibDB::Instance()->GetPIDResponse(fkReconstructor->GetRecoParam()->GetPIDmethod());
385 104 : if(!pidResponse){
386 0 : AliError("PID Response not available");
387 0 : return kFALSE;
388 : }
389 104 : Double_t dEdx[kNplane * (Int_t)AliTRDseedV1::kNdEdxSlices] = {0.};
390 104 : Float_t trackletP[kNplane] = {0.};
391 :
392 104 : fNdEdxSlices = pidResponse->GetNumberOfSlices();
393 1456 : for(Int_t iseed = 0; iseed < kNplane; iseed++){
394 624 : if(!fTracklet[iseed]) continue;
395 206 : trackletP[iseed] = fTracklet[iseed]->GetMomentum();
396 : // if(pidResponse->GetPIDmethod() == AliTRDPIDResponse::kLQ1D){
397 206 : dEdx[iseed] = fTracklet[iseed]->GetdQdl();
398 : /* } else {
399 : fTracklet[iseed]->CookdEdx(fNdEdxSlices);
400 : const Float_t *trackletdEdx = fTracklet[iseed]->GetdEdx();
401 : for(Int_t islice = 0; islice < fNdEdxSlices; islice++){
402 : dEdx[iseed*fNdEdxSlices + islice] = trackletdEdx[islice];
403 : }
404 : }*/
405 206 : }
406 104 : pidResponse->GetResponse(fNdEdxSlices, dEdx, trackletP, fPID);
407 :
408 : static Int_t nprint = 0;
409 104 : if(!nprint){
410 2 : AliTRDdEdxBaseUtils::PrintControl();
411 2 : nprint++;
412 2 : }
413 :
414 : //do truncated mean
415 104 : AliTRDdEdxCalibUtils::SetObjArray(AliTRDcalibDB::Instance()->GetPHQ());
416 312 : const Double_t mag = AliTRDdEdxBaseUtils::IsExBOn() ? GetBz() : -1;
417 312 : const Double_t charge = AliTRDdEdxBaseUtils::IsExBOn() ? Charge() : -1;
418 104 : fTruncatedMean = CookTruncatedMean(0, mag, charge, kTRUE, fNchamberdEdx, fNclusterdEdx);
419 :
420 : return kTRUE;
421 208 : }
422 :
423 : //___________________________________________________________
424 : UChar_t AliTRDtrackV1::GetNumberOfTrackletsPID() const
425 : {
426 : // Retrieve number of tracklets used for PID calculation.
427 :
428 : UChar_t nPID = 0;
429 1560 : for(int ip=0; ip<kNplane; ip++){
430 830 : if(fTrackletIndex[ip]<0 || !fTracklet[ip]) continue;
431 206 : if(!fTracklet[ip]->IsOK()) continue;
432 :
433 206 : nPID++;
434 206 : }
435 104 : return nPID;
436 : }
437 :
438 : //_______________________________________________________________
439 : AliTRDcluster* AliTRDtrackV1::GetCluster(Int_t id)
440 : {
441 : // Get the cluster at a certain position in the track
442 : Int_t n = 0;
443 0 : for(Int_t ip=0; ip<kNplane; ip++){
444 0 : if(!fTracklet[ip]) continue;
445 0 : if(n+fTracklet[ip]->GetN() <= id){
446 0 : n+=fTracklet[ip]->GetN();
447 0 : continue;
448 : }
449 : AliTRDcluster *c = NULL;
450 0 : for(Int_t ic=AliTRDseedV1::kNclusters; ic--;){
451 0 : if(!(c = fTracklet[ip]->GetClusters(ic))) continue;
452 :
453 0 : if(n<id){n++; continue;}
454 0 : return c;
455 : }
456 0 : }
457 0 : return NULL;
458 0 : }
459 :
460 : //_______________________________________________________________
461 : Int_t AliTRDtrackV1::GetClusterIndex(Int_t id) const
462 : {
463 : // Get the cluster index at a certain position in the track
464 : Int_t n = 0;
465 0 : for(Int_t ip=0; ip<kNplane; ip++){
466 0 : if(!fTracklet[ip]) continue;
467 0 : if(n+fTracklet[ip]->GetN() <= id){
468 0 : n+=fTracklet[ip]->GetN();
469 0 : continue;
470 : }
471 0 : for(Int_t ic=AliTRDseedV1::kNclusters; ic--;){
472 0 : if(!(fTracklet[ip]->GetClusters(ic))) continue;
473 0 : if(n<id){n++; continue;}
474 0 : return fTracklet[ip]->GetIndexes(ic);
475 : }
476 : }
477 0 : return -1;
478 0 : }
479 :
480 : //_______________________________________________________________
481 : Double_t AliTRDtrackV1::GetPredictedChi2(const AliTRDseedV1 *trklt, Double_t *cov) const
482 : {
483 : // Compute chi2 between tracklet and track. The value is calculated at the radial position of the track
484 : // equal to the reference radial position of the tracklet (see AliTRDseedV1)
485 : //
486 : // The chi2 estimator is computed according to the following formula
487 : // BEGIN_LATEX
488 : // #chi^{2}=(X_{trklt}-X_{track})(C_{trklt}+C_{track})^{-1}(X_{trklt}-X_{track})^{T}
489 : // END_LATEX
490 : // where X=(y z), the position of the track/tracklet in the yz plane
491 : //
492 :
493 0 : Double_t p[2] = { trklt->GetY(), trklt->GetZ()};
494 0 : trklt->GetCovAt(trklt->GetX(), cov);
495 0 : return AliExternalTrackParam::GetPredictedChi2(p, cov);
496 0 : }
497 :
498 : //_______________________________________________________________
499 : Int_t AliTRDtrackV1::GetSector() const
500 : {
501 2402 : return Int_t(GetAlpha()/AliTRDgeometry::GetAlpha() + (GetAlpha()>0. ? 0 : AliTRDgeometry::kNsector));
502 : }
503 :
504 : //_______________________________________________________________
505 : Bool_t AliTRDtrackV1::IsEqual(const TObject *o) const
506 : {
507 : // Checks whether two tracks are equal
508 104 : if (!o) return kFALSE;
509 156 : const AliTRDtrackV1 *inTrack = dynamic_cast<const AliTRDtrackV1*>(o);
510 104 : if (!inTrack) return kFALSE;
511 :
512 : //if ( fPIDquality != inTrack->GetPIDquality() ) return kFALSE;
513 :
514 0 : if(memcmp(fPID, inTrack->fPID, AliPID::kSPECIES*sizeof(Double32_t))) return kFALSE;
515 0 : if(memcmp(fBudget, inTrack->fBudget, 3*sizeof(Double32_t))) return kFALSE;
516 0 : if(memcmp(&fDE, &inTrack->fDE, sizeof(Double32_t))) return kFALSE;
517 0 : if(memcmp(&fFakeRatio, &inTrack->fFakeRatio, sizeof(Double32_t))) return kFALSE;
518 0 : if(memcmp(&fChi2, &inTrack->fChi2, sizeof(Double32_t))) return kFALSE;
519 0 : if(memcmp(&fMass, &inTrack->fMass, sizeof(Double32_t))) return kFALSE;
520 0 : if( fLab != inTrack->fLab ) return kFALSE;
521 0 : if( fN != inTrack->fN ) return kFALSE;
522 0 : Double32_t l(0.), in(0.);
523 0 : l = GetIntegratedLength(); in = inTrack->GetIntegratedLength();
524 0 : if(memcmp(&l, &in, sizeof(Double32_t))) return kFALSE;
525 0 : l=GetX(); in=inTrack->GetX();
526 0 : if(memcmp(&l, &in, sizeof(Double32_t))) return kFALSE;
527 0 : l = GetAlpha(); in = inTrack->GetAlpha();
528 0 : if(memcmp(&l, &in, sizeof(Double32_t))) return kFALSE;
529 0 : if(memcmp(GetParameter(), inTrack->GetParameter(), 5*sizeof(Double32_t))) return kFALSE;
530 0 : if(memcmp(GetCovariance(), inTrack->GetCovariance(), 15*sizeof(Double32_t))) return kFALSE;
531 :
532 0 : for (Int_t iTracklet = 0; iTracklet < kNplane; iTracklet++){
533 0 : AliTRDseedV1 *curTracklet = fTracklet[iTracklet];
534 0 : AliTRDseedV1 *inTracklet = inTrack->GetTracklet(iTracklet);
535 0 : if (curTracklet && inTracklet){
536 0 : if (! curTracklet->IsEqual(inTracklet) ) {
537 0 : curTracklet->Print();
538 0 : inTracklet->Print();
539 0 : return kFALSE;
540 : }
541 : } else {
542 : // if one tracklet exists, and corresponding
543 : // in other track doesn't - return kFALSE
544 0 : if(inTracklet || curTracklet) return kFALSE;
545 : }
546 0 : }
547 :
548 0 : return kTRUE;
549 52 : }
550 :
551 : //_______________________________________________________________
552 : Bool_t AliTRDtrackV1::IsElectron() const
553 : {
554 0 : if(GetPID(0) > fkReconstructor->GetRecoParam()->GetPIDThreshold(GetP())) return kTRUE;
555 0 : return kFALSE;
556 0 : }
557 :
558 :
559 : //_____________________________________________________________________________
560 : Int_t AliTRDtrackV1::MakeBackupTrack()
561 : {
562 : //
563 : // Creates a backup track
564 : // TO DO update quality check of the track.
565 : //
566 :
567 : Float_t occupancy(0.); Int_t n(0), ncls(0);
568 2538 : for(Int_t il(AliTRDgeometry::kNlayer); il--;){
569 1236 : if(!fTracklet[il]) continue;
570 684 : n++;
571 684 : occupancy+=fTracklet[il]->GetTBoccupancy()/AliTRDseedV1::kNtb;
572 684 : ncls += fTracklet[il]->GetN();
573 : }
574 206 : if(!n) return -1;
575 206 : occupancy/=n;
576 :
577 : //Float_t ratio1 = Float_t(t.GetNumberOfClusters()+1) / Float_t(t.GetNExpected()+1);
578 :
579 : Int_t failedCutId(0);
580 217 : if(GetChi2()/n > 5.0) failedCutId=1;
581 412 : if(occupancy < 0.7) failedCutId=2;
582 : //if(ratio1 > 0.6) &&
583 : //if(ratio0+ratio1 > 1.5) &&
584 262 : if(GetNCross() != 0) failedCutId=3;
585 206 : if(TMath::Abs(GetSnp()) > 0.85) failedCutId=4;
586 217 : if(ncls < 20) failedCutId=5;
587 :
588 206 : if(failedCutId){
589 618 : AliDebug(2, Form("\n"
590 : "chi2/tracklet < 5.0 [%c] %5.2f\n"
591 : "occupancy > 0.7 [%c] %4.2f\n"
592 : "NCross == 0 [%c] %d\n"
593 : "Abs(snp) < 0.85 [%c] %4.2f\n"
594 : "NClusters > 20 [%c] %d"
595 : ,(GetChi2()/n<5.0)?'y':'n', GetChi2()/n
596 : ,(occupancy>0.7)?'y':'n', occupancy
597 : ,(GetNCross()==0)?'y':'n', GetNCross()
598 : ,(TMath::Abs(GetSnp())<0.85)?'y':'n', TMath::Abs(GetSnp())
599 : ,(ncls>20)?'y':'n', ncls
600 : ));
601 206 : return failedCutId;
602 : }
603 :
604 0 : if(fBackupTrack) {
605 0 : fBackupTrack->~AliTRDtrackV1();
606 0 : new(fBackupTrack) AliTRDtrackV1((AliTRDtrackV1&)(*this));
607 0 : return 0;
608 : }
609 0 : fBackupTrack = new AliTRDtrackV1((AliTRDtrackV1&)(*this));
610 0 : return 0;
611 206 : }
612 :
613 : //_____________________________________________________________________________
614 : Int_t AliTRDtrackV1::GetProlongation(Double_t xk, Double_t &y, Double_t &z) const
615 : {
616 : //
617 : // Find a prolongation at given x
618 : // Return -1 if it does not exist
619 : //
620 :
621 23030 : Double_t bz = GetBz();
622 11541 : if (!AliExternalTrackParam::GetYAt(xk,bz,y)) return -1;
623 11489 : if (!AliExternalTrackParam::GetZAt(xk,bz,z)) return -1;
624 :
625 11489 : return 1;
626 :
627 11515 : }
628 :
629 : //_____________________________________________________________________________
630 : Bool_t AliTRDtrackV1::PropagateTo(Double_t xk, Double_t xx0, Double_t xrho)
631 : {
632 : //
633 : // Propagates this track to a reference plane defined by "xk" [cm]
634 : // correcting for the mean crossed material.
635 : //
636 : // "xx0" - thickness/rad.length [units of the radiation length]
637 : // "xrho" - thickness*density [g/cm^2]
638 : //
639 :
640 20278 : if (TMath::Abs(xk - GetX())<AliTRDReconstructor::GetEpsilon()*0.1) return kTRUE; // 10% of the tracker precision
641 :
642 10139 : Double_t xyz0[3] = {GetX(), GetY(), GetZ()}, // track position BEFORE propagation
643 : b[3]; // magnetic field
644 10139 : GetBxByBz(b);
645 10139 : if(!AliExternalTrackParam::PropagateToBxByBz(xk,b)) return kFALSE;
646 :
647 : // local track position AFTER propagation
648 10139 : Double_t xyz1[3] = {GetX(), GetY(), GetZ()};
649 : // printf("x0[%6.2f] -> x1[%6.2f] dx[%6.2f] rho[%f]\n", xyz0[0], xyz1[0], xyz0[0]-xk, xrho/TMath::Abs(xyz0[0]-xk));
650 10139 : if(xyz0[0] < xk) {
651 7307 : xrho = -xrho;
652 7307 : if (IsStartedTimeIntegral()) {
653 14614 : Double_t l2 = TMath::Sqrt((xyz1[0]-xyz0[0])*(xyz1[0]-xyz0[0])
654 7307 : + (xyz1[1]-xyz0[1])*(xyz1[1]-xyz0[1])
655 7307 : + (xyz1[2]-xyz0[2])*(xyz1[2]-xyz0[2]));
656 7307 : Double_t crv = AliExternalTrackParam::GetC(b[2]);
657 7307 : if (TMath::Abs(l2*crv) > 0.0001) {
658 : // Make correction for curvature if neccesary
659 6933 : l2 = 0.5 * TMath::Sqrt((xyz1[0]-xyz0[0])*(xyz1[0]-xyz0[0])
660 : + (xyz1[1]-xyz0[1])*(xyz1[1]-xyz0[1]));
661 6933 : l2 = 2.0 * TMath::ASin(l2 * crv) / crv;
662 6933 : l2 = TMath::Sqrt(l2*l2 + (xyz1[2]-xyz0[2])*(xyz1[2]-xyz0[2]));
663 6933 : }
664 7307 : AddTimeStep(l2);
665 7307 : }
666 : }
667 10142 : if (!AliExternalTrackParam::CorrectForMeanMaterial(xx0, xrho, fMass)) return kFALSE;
668 :
669 :
670 : {
671 :
672 : // Energy losses
673 10136 : Double_t p2 = (1.0 + GetTgl()*GetTgl()) / (GetSigned1Pt()*GetSigned1Pt());
674 10136 : if (fMass<0) p2 *= 4; // q=2
675 10136 : Double_t beta2 = p2 / (p2 + fMass*fMass);
676 20272 : if ((beta2 < 1.0e-10) ||
677 10136 : ((5940.0 * beta2/(1.0 - beta2 + 1.0e-10) - beta2) < 0.0)) {
678 0 : return kFALSE;
679 : }
680 :
681 10136 : Double_t dE = 0.153e-3 / beta2
682 10136 : * (TMath::Log(5940.0 * beta2/(1.0 - beta2 + 1.0e-10)) - beta2)
683 10136 : * xrho;
684 10136 : if (fMass<0) dE *= 4; // q=2
685 10136 : fBudget[0] += xrho;
686 :
687 : /*
688 : // Suspicious part - think about it ?
689 : Double_t kinE = TMath::Sqrt(p2);
690 : if (dE > 0.8*kinE) dE = 0.8 * kinE; //
691 : if (dE < 0) dE = 0.0; // Not valid region for Bethe bloch
692 : */
693 :
694 10136 : fDE += dE;
695 :
696 : /*
697 : // Suspicious ! I.B.
698 : Double_t sigmade = 0.07 * TMath::Sqrt(TMath::Abs(dE)); // Energy loss fluctuation
699 : Double_t sigmac2 = sigmade*sigmade*fC*fC*(p2+fMass*fMass)/(p2*p2);
700 : fCcc += sigmac2;
701 : fCee += fX*fX * sigmac2;
702 : */
703 :
704 10136 : }
705 :
706 10136 : return kTRUE;
707 20278 : }
708 :
709 : //_____________________________________________________________________________
710 : Int_t AliTRDtrackV1::PropagateToR(Double_t r,Double_t step)
711 : {
712 : //
713 : // Propagate track to the radial position
714 : // Rotation always connected to the last track position
715 : //
716 :
717 0 : Double_t xyz0[3];
718 0 : Double_t xyz1[3];
719 0 : Double_t y;
720 0 : Double_t z;
721 :
722 0 : Double_t radius = TMath::Sqrt(GetX()*GetX() + GetY()*GetY());
723 : // Direction +-
724 0 : Double_t dir = (radius > r) ? -1.0 : 1.0;
725 :
726 0 : for (Double_t x = radius+dir*step; dir*x < dir*r; x += dir*step) {
727 :
728 0 : GetXYZ(xyz0);
729 0 : Double_t alpha = TMath::ATan2(xyz0[1],xyz0[0]);
730 0 : Rotate(alpha,kTRUE);
731 0 : GetXYZ(xyz0);
732 0 : if(GetProlongation(x,y,z)<0) return -1;
733 0 : xyz1[0] = x * TMath::Cos(alpha) + y * TMath::Sin(alpha);
734 0 : xyz1[1] = x * TMath::Sin(alpha) - y * TMath::Cos(alpha);
735 0 : xyz1[2] = z;
736 0 : Double_t param[7];
737 0 : if(AliTracker::MeanMaterialBudget(xyz0,xyz1,param)<=0.) return -1;
738 0 : if (param[1] <= 0) {
739 0 : param[1] = 100000000;
740 0 : }
741 0 : PropagateTo(x,param[1],param[0]*param[4]);
742 :
743 0 : }
744 :
745 0 : GetXYZ(xyz0);
746 0 : Double_t alpha = TMath::ATan2(xyz0[1],xyz0[0]);
747 0 : Rotate(alpha,kTRUE);
748 0 : GetXYZ(xyz0);
749 0 : if(GetProlongation(r,y,z)<0) return -1;
750 0 : xyz1[0] = r * TMath::Cos(alpha) + y * TMath::Sin(alpha);
751 0 : xyz1[1] = r * TMath::Sin(alpha) - y * TMath::Cos(alpha);
752 0 : xyz1[2] = z;
753 0 : Double_t param[7];
754 0 : if(AliTracker::MeanMaterialBudget(xyz0,xyz1,param) <= 0.) return -1;
755 :
756 0 : if (param[1] <= 0) {
757 0 : param[1] = 100000000;
758 0 : }
759 0 : PropagateTo(r,param[1],param[0]*param[4]);
760 :
761 0 : return 0;
762 :
763 0 : }
764 :
765 : //_____________________________________________________________________________
766 : void AliTRDtrackV1::Print(Option_t *o) const
767 : {
768 : // Print track status
769 0 : AliInfo(Form("PID [%4.1f %4.1f %4.1f %4.1f %4.1f]", 1.E2*fPID[0], 1.E2*fPID[1], 1.E2*fPID[2], 1.E2*fPID[3], 1.E2*fPID[4]));
770 0 : AliInfo(Form("Material[%5.2f %5.2f %5.2f]", fBudget[0], fBudget[1], fBudget[2]));
771 :
772 0 : AliInfo(Form("x[%7.2f] t[%7.4f] alpha[%f] mass[%f]", GetX(), GetIntegratedLength(), GetAlpha(), fMass));
773 0 : AliInfo(Form("Ntr[%1d] NtrPID[%1d] Ncl[%3d] lab[%3d]", GetNumberOfTracklets(), GetNumberOfTrackletsPID(), fN, fLab));
774 :
775 0 : printf("|X| = (");
776 0 : const Double_t *curP = GetParameter();
777 0 : for (Int_t i = 0; i < 5; i++) printf("%7.2f ", curP[i]);
778 0 : printf(")\n");
779 :
780 0 : printf("|V| = \n");
781 0 : const Double_t *curC = GetCovariance();
782 0 : for (Int_t i = 0, j=4, k=0; i<15; i++, k++){
783 0 : printf("%7.2f ", curC[i]);
784 0 : if(k==j){
785 0 : printf("\n");
786 0 : k=-1; j--;
787 0 : }
788 : }
789 0 : if(strcmp(o, "a")!=0) return;
790 :
791 0 : for(Int_t ip=0; ip<kNplane; ip++){
792 0 : if(!fTracklet[ip]) continue;
793 0 : fTracklet[ip]->Print(o);
794 0 : }
795 0 : }
796 :
797 :
798 : //_____________________________________________________________________________
799 : Bool_t AliTRDtrackV1::Rotate(Double_t alpha, Bool_t absolute)
800 : {
801 : //
802 : // Rotates track parameters in R*phi plane
803 : // if absolute rotation alpha is in global system
804 : // otherwise alpha rotation is relative to the current rotation angle
805 : //
806 :
807 46 : if (absolute) alpha -= GetAlpha();
808 : //else fNRotate++;
809 :
810 46 : return AliExternalTrackParam::Rotate(GetAlpha()+alpha);
811 : }
812 :
813 : //___________________________________________________________
814 : void AliTRDtrackV1::SetNumberOfClusters()
815 : {
816 : // Calculate the number of clusters attached to this track
817 :
818 : Int_t ncls = 0;
819 6180 : for(int ip=0; ip<kNplane; ip++){
820 5208 : if(fTracklet[ip] && fTrackletIndex[ip] >= 0) ncls += fTracklet[ip]->GetN();
821 : }
822 412 : AliKalmanTrack::SetNumberOfClusters(ncls);
823 412 : }
824 :
825 :
826 : //_______________________________________________________________
827 : void AliTRDtrackV1::SetOwner()
828 : {
829 : //
830 : // Toggle ownership of tracklets
831 : //
832 :
833 208 : if(TestBit(kOwner)) return;
834 1456 : for (Int_t ip = 0; ip < kNplane; ip++) {
835 830 : if(fTrackletIndex[ip]<0 || !fTracklet[ip]) continue;
836 412 : fTracklet[ip] = new AliTRDseedV1(*fTracklet[ip]);
837 206 : fTracklet[ip]->SetOwner();
838 206 : }
839 104 : SetBit(kOwner);
840 208 : }
841 :
842 : //_______________________________________________________________
843 : void AliTRDtrackV1::SetTracklet(AliTRDseedV1 *const trklt, Int_t index)
844 : {
845 : //
846 : // Set the tracklets
847 : //
848 824 : Int_t plane = trklt->GetPlane();
849 :
850 412 : fTracklet[plane] = trklt;
851 412 : fTrackletIndex[plane] = index;
852 412 : }
853 :
854 : //_______________________________________________________________
855 : void AliTRDtrackV1::SetTrackIn()
856 : {
857 : // Save location of birth for the TRD track
858 : // If the pointer is not valid allocate memory
859 : //
860 84 : const AliExternalTrackParam *op = dynamic_cast<const AliExternalTrackParam*>(this);
861 :
862 : //printf("SetTrackIn() : fTrackLow[%p]\n", (void*)fTrackLow);
863 42 : if(fTrackLow){
864 0 : fTrackLow->~AliExternalTrackParam();
865 0 : new(fTrackLow) AliExternalTrackParam(*op);
866 84 : } else fTrackLow = new AliExternalTrackParam(*op);
867 42 : }
868 :
869 : //_______________________________________________________________
870 : void AliTRDtrackV1::SetTrackOut(const AliExternalTrackParam *op)
871 : {
872 : // Save location of death for the TRD track
873 : // If the pointer is not valid allocate memory
874 : //
875 84 : if(!op) op = dynamic_cast<const AliExternalTrackParam*>(this);
876 42 : if(fTrackHigh){
877 0 : fTrackHigh->~AliExternalTrackParam();
878 0 : new(fTrackHigh) AliExternalTrackParam(*op);
879 84 : } else fTrackHigh = new AliExternalTrackParam(*op);
880 42 : }
881 :
882 : //_______________________________________________________________
883 : void AliTRDtrackV1::UnsetTracklet(Int_t plane)
884 : {
885 0 : if(plane<0) return;
886 0 : fTrackletIndex[plane] = -1;
887 0 : fTracklet[plane] = NULL;
888 0 : }
889 :
890 :
891 : //_______________________________________________________________
892 : void AliTRDtrackV1::UpdateChi2(Float_t chi2)
893 : {
894 : // Update chi2/track with one tracklet contribution
895 824 : SetChi2(GetChi2() + chi2);
896 412 : }
897 :
898 : //_______________________________________________________________
899 : void AliTRDtrackV1::UpdateESDtrack(AliESDtrack *track)
900 : {
901 : //
902 : // Update the TRD PID information in the ESD track
903 : //
904 :
905 : // Int_t nslices = AliTRDcalibDB::Instance()->GetPIDResponse(fkReconstructor->GetRecoParam()->GetPIDmethod())->GetNumberOfSlices();
906 : // number of tracklets used for PID calculation
907 208 : UChar_t nPID = GetNumberOfTrackletsPID();
908 : // number of tracklets attached to the track
909 104 : UChar_t nTrk = GetNumberOfTracklets();
910 : // pack the two numbers together and store them in the ESD
911 104 : track->SetTRDntracklets(nPID | (nTrk<<3));
912 : // allocate space to store raw PID signals dEdx & momentum
913 : // independent of the method used to calculate PID (see below AliTRDPIDResponse)
914 104 : track->SetNumberOfTRDslices((AliTRDseedV1::kNdEdxSlices+2)*AliTRDgeometry::kNlayer);
915 : // store raw signals
916 104 : Float_t p, sp; Double_t spd;
917 1456 : for (Int_t ip = 0; ip < kNplane; ip++) {
918 830 : if(fTrackletIndex[ip]<0 || !fTracklet[ip]) continue;
919 : // Fill TRD dEdx info into ESD track
920 : // a. Set Summed dEdx into the first slice
921 206 : track->SetTRDslice(fTracklet[ip]->GetdQdl(), ip, 0);
922 : // b. Set NN dEdx slices
923 206 : fTracklet[ip]->CookdEdx(AliTRDPIDResponse::kNslicesNN);
924 206 : const Float_t *dedx = fTracklet[ip]->GetdEdx();
925 3502 : for (Int_t js(0), ks(1); js < AliTRDPIDResponse::kNslicesNN; js++, ks++, dedx++){
926 1442 : if(ks>=AliTRDseedV1::kNdEdxSlices){
927 0 : AliError(Form("Exceed allocated space for dEdx slices."));
928 0 : break;
929 : }
930 1442 : track->SetTRDslice(*dedx, ip, ks);
931 : }
932 : // fill TRD momentum info into ESD track
933 206 : p = fTracklet[ip]->GetMomentum(&sp); spd = sp;
934 206 : track->SetTRDmomentum(p, ip, &spd);
935 : // store global quality per tracklet instead of momentum error
936 : // 26.09.11 A.Bercuci
937 : // first implementation store no. of time bins filled in tracklet (5bits see "y" bits) and
938 : // no. of double clusters in case of pad row cross (4bits see "x" bits)
939 : // bit map for tracklet quality xxxxyyyyy
940 : // 27.10.11 A.Bercuci
941 : // add chamber status bit "z" bit
942 : // bit map for tracklet quality zxxxxyyyyy
943 : // 12.11.11 A.Bercuci
944 : // fit tracklet quality into the field fTRDTimeBin [Char_t]
945 : // bit map for tracklet quality zxxyyyyy
946 : // The information should be retrieved by the following functions of AliESDtrack for each TRD layer
947 : // GetTRDtrkltOccupancy(layer) -> no of TB filled in tracklet
948 : // GetTRDtrkltClCross(layer) -> no of TB filled in crossing pad rows
949 : // IsTRDtrkltChmbGood(layer) -> status of the chamber from which the tracklet is found
950 426 : Int_t nCross(fTracklet[ip]->IsRowCross()?fTracklet[ip]->GetTBcross():0); if(nCross>3) nCross = 3;
951 206 : Char_t trackletQ = Char_t(fTracklet[ip]->GetTBoccupancy() | (nCross<<5) | (fTracklet[ip]->IsChmbGood()<<7));
952 206 : track->SetTRDTimBin(trackletQ, ip);
953 206 : }
954 : // store PID probabilities
955 104 : track->SetTRDpid(fPID);
956 :
957 : //store truncated mean
958 104 : track->SetTRDsignal(fTruncatedMean);
959 104 : track->SetTRDNchamberdEdx(fNchamberdEdx);
960 104 : track->SetTRDNclusterdEdx(fNclusterdEdx);
961 104 : }
962 :
963 : //_______________________________________________________________
964 : Double_t AliTRDtrackV1::CookTruncatedMean(const Bool_t kinvq, const Double_t mag, const Int_t charge, const Int_t kcalib, Int_t &nch, Int_t &ncls, TVectorD *Qs, TVectorD *Xs, Int_t timeBin0, Int_t timeBin1, Int_t tstep) const
965 : {
966 : //
967 : //Origin: Xianguo Lu <xianguo.lu@cern.ch>, Marian Ivanov <marian.ivanov@cern.ch>
968 : //
969 :
970 104 : TVectorD arrayQ(200), arrayX(200);
971 208 : ncls = AliTRDdEdxReconUtils::GetArrayClusterQ(kinvq, &arrayQ, &arrayX, this, timeBin0, timeBin1, tstep);
972 :
973 312 : const TObjArray *cobj = kcalib ? AliTRDdEdxCalibUtils::GetObj(kinvq, mag, charge) : NULL;
974 :
975 104 : const Double_t tmean = AliTRDdEdxReconUtils::ToyCook(kinvq, ncls, &arrayQ, &arrayX, cobj);
976 :
977 208 : nch = AliTRDdEdxReconUtils::UpdateArrayX(ncls, &arrayX);
978 :
979 104 : if(Qs && Xs){
980 0 : (*Qs)=arrayQ;
981 0 : (*Xs)=arrayX;
982 : }
983 :
984 : //printf("\ntest %.10f %d %d\n", tmean, nch, ncls);
985 :
986 : return tmean;
987 104 : }
988 :
989 : //_______________________________________________________________
990 : TObject* AliTRDtrackV1::Clone(const char* newname) const
991 : {
992 : // temporary override TObject::Clone to avoid crashes in reco
993 : AliTRDtrackV1* src = (AliTRDtrackV1*)this;
994 0 : Bool_t isown = src->IsOwner();
995 : //AliInfo(Form("src_owner %d",isown));
996 0 : AliTRDtrackV1* dst = new AliTRDtrackV1(*src);
997 0 : if (isown) {
998 0 : src->SetBit(kOwner);
999 0 : dst->SetOwner();
1000 0 : }
1001 0 : return dst;
1002 0 : }
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