adding support for xml files in AliHLTSystem (Lars)
[u/mrichter/AliRoot.git] / HLT / global / AliHLTV0FinderComponent.cxx
CommitLineData
f078d002 1// $Id$
2
3//**************************************************************************
4//* This file is property of and copyright by the ALICE HLT Project *
5//* ALICE Experiment at CERN, All rights reserved. *
6//* *
7//* Primary Authors: Timur Pocheptsov <Timur.Pocheptsov@cern.ch> *
8//* for The ALICE HLT Project. *
9//* *
10//* Permission to use, copy, modify and distribute this software and its *
11//* documentation strictly for non-commercial purposes is hereby granted *
12//* without fee, provided that the above copyright notice appears in all *
13//* copies and that both the copyright notice and this permission notice *
14//* appear in the supporting documentation. The authors make no claims *
15//* about the suitability of this software for any purpose. It is *
16//* provided "as is" without express or implied warranty. *
17//**************************************************************************
18
19/// @file AliHLTV0FinderComponent.cxx
20/// @author Timur Pocheptsov
21/// @date 2010-12-26
22/// @brief V0 finder component
23///
24
25#include "TString.h"
26
27#include "AliHLTDataTypes.h"
28#include "AliHLTV0FinderComponent.h"
29
30ClassImp(AliHLTV0FinderComponent)
31
32const double AliHLTV0FinderComponent::fgDaughterPrimDeviation = 2.5;
33const double AliHLTV0FinderComponent::fgPrimDeviation = 3.5;
34const double AliHLTV0FinderComponent::fgChi = 3.5;
35const double AliHLTV0FinderComponent::fgDecayLengthInSigmas = 3.;
36
37//________________________________________________________________________
38AliHLTV0FinderComponent::AliHLTV0FinderComponent()
39 : fPrimaryVtx(),
40 fPrimaryTracks(),
41 fNPrimaryTracks(0),
42 fMinPrimID(0),
43 fMaxPrimID(0),
44 fDaughterPrimDeviation(fgDaughterPrimDeviation),
45 fPrimDeviation(fgPrimDeviation),
46 fChi(fgChi),
47 fDecayLengthInSigmas(fgDecayLengthInSigmas),
48 fPosPID(211),
49 fNegPID(211),
50 fV0s(),
51 fGammaFinder(false)
52{
53 //Default ctor.
54}
55
56//________________________________________________________________________
57const char* AliHLTV0FinderComponent::GetComponentID()
58{
59 //Component's "name".
60 return "V0Finder";
61}
62
63//________________________________________________________________________
64void AliHLTV0FinderComponent::GetInputDataTypes(AliHLTComponentDataTypeList& list)
65{
66 //Input to the primary vertex finder:
67 //a)tracks from ESD object;
68 //b)hlt tracks (ITS)
69 //c)hlt tracks (TPC)
70 //d)primary vertex (AliKFVertex)
71 //e)indices of primary tracks.
72 list.clear();
73 //Input tracks.
74 list.push_back(kAliHLTDataTypeESDObject);
75 list.push_back(kAliHLTDataTypeTrack | kAliHLTDataOriginITS);
76 list.push_back(kAliHLTDataTypeTrack | kAliHLTDataOriginTPC);
77 //Input from primary finder:
78 //Primary vertex.
79 list.push_back(kAliHLTDataTypeKFVertex | kAliHLTDataOriginOut);
80 //Primary tracks' indices.
81 list.push_back(kAliHLTDataTypePrimaryFinder | kAliHLTDataOriginOut);
82}
83
84//________________________________________________________________________
85AliHLTComponentDataType AliHLTV0FinderComponent::GetOutputDataType()
86{
87 //Data type of output.
88 return kAliHLTMultipleDataType;
89}
90
91//________________________________________________________________________
92int AliHLTV0FinderComponent::GetOutputDataTypes(AliHLTComponentDataTypeList& tgtList)
93{
94 //Output type for V0 finder.
95 tgtList.clear();
96 //Indices of tracks, participating in V0s.
97 tgtList.push_back(kAliHLTDataTypeV0Finder | kAliHLTDataOriginOut);
98
99 return tgtList.size();
100}
101
102//________________________________________________________________________
103void AliHLTV0FinderComponent::GetOutputDataSize(unsigned long& constBase, double& inputMultiplier)
104{
105 //These numbers are complete crap.
106 constBase = 80000;
107 inputMultiplier = 2.;
108}
109
110//________________________________________________________________________
111AliHLTComponent* AliHLTV0FinderComponent::Spawn()
112{
113 //Create primary vertex finder componet.
114 return new AliHLTV0FinderComponent;
115}
116
117//________________________________________________________________________
118int AliHLTV0FinderComponent::DoInit(int /*argc*/, const char** /*argv*/)
119{
120 //1. Default parameters.
121 fDaughterPrimDeviation = fgDaughterPrimDeviation;
122 fPrimDeviation = fgPrimDeviation;
123 fChi = fgChi;
124 fDecayLengthInSigmas = fgDecayLengthInSigmas;
125 fPosPID = 211;
126 fNegPID = 211;
127 fGammaFinder = false;
128
129 //Part with OCDB and command line arguments is commented
130 //until OCDB is updated.
131/*
132 //2. Parameters from OCDB.
133 TString cdbPath("HLT/ConfigHLT/");
134 cdbPath += GetComponentID();
135
136 int res = ConfigureFromCDBTObjString(cdbPath);
137 if (res < 0)
138 return res;
139
140 //3. "Command line" parameters.
141 if (argc)
142 res = ConfigureFromArgumentString(argc, argv);
143
144 return res;*/
145 return 0;
146}
147
148//________________________________________________________________________
149int AliHLTV0FinderComponent::ScanConfigurationArgument(int argc, const char** argv)
150{
151 //Scan one argument and its parameters from the list
152 //Return number of processed entries.
153 //Possible arguments:
154 //-daughterPrimDeviation num
155 //-primDeviation num
156 //-chi num
157 //-decayLengthInSigmas num
158 //-posPID int_num
159 //-negPid int_num
160 //-gammaFinder 0/1
161
162 AliHLTUtility::CmdLineParser parser;
163 parser.Add("-daughterPrimDeviation", &fDaughterPrimDeviation);
164 parser.Add("-primDeviation", &fPrimDeviation);
165 parser.Add("-chi", &fChi);
166 parser.Add("-decayLengthInSigmas", &fDecayLengthInSigmas);
167 parser.Add("-posPID", &fPosPID);
168 parser.Add("-negPID", &fNegPID);
169 parser.Add("-gammaFinder", &fGammaFinder);
170
171 const int nParsed = parser.Parse(argc, argv, 0);
172 if (nParsed < 0) {
173 HLTError(parser.GetError().Data());
174 return -EPROTO;
175 }
176
177 return nParsed;
178}
179
180//________________________________________________________________________
181int AliHLTV0FinderComponent::DoDeinit()
182{
183 //Reset parameters to default.
184 fDaughterPrimDeviation = fgDaughterPrimDeviation;
185 fPrimDeviation = fgPrimDeviation;
186 fChi = fgChi;
187 fDecayLengthInSigmas = fgDecayLengthInSigmas;
188 fPosPID = 211;
189 fNegPID = 211;
190 fGammaFinder = false;
191
192 return 0;
193}
194
195//________________________________________________________________________
196int AliHLTV0FinderComponent::DoEvent(const AliHLTComponentEventData& /*evtData*/,
197 AliHLTComponentTriggerData& /*trigData*/)
198{
199 //Find primary vertex.
200 if (GetFirstInputBlock(kAliHLTDataTypeSOR) || GetFirstInputBlock(kAliHLTDataTypeEOR))
201 return 0;
202
203 //Clean all previous track infos.
204 fTrackInfos.clear();
205 fPrimaryTracks.clear();
206
207 //Initialize KF package.
208 AliKFParticle::SetField(GetBz());
209
210 if (!ReadPrimaryVertex())
211 return 0;
212
213 if (!ReadTracks())
214 return 0;
215
216 FindV0s();
217
218 return DoOutput();
219}
220
221//________________________________________________________________________
222bool AliHLTV0FinderComponent::ReadPrimaryVertex()
223{
224 //Primary finder produces primary vertex (AliKFVertex) and
225 //indices for primary tracks.
226 //1. Try to extract primary vertex.
227 const TObject* obj = GetFirstInputObject(kAliHLTDataTypeKFVertex | kAliHLTDataOriginOut);
228 const AliKFVertex* kfVtx = dynamic_cast<const AliKFVertex*>(obj);
229
230 if (!kfVtx) {
231 HLTError("V0 finder requires KF vertex (primary vertex) as input");
232 return false;
233 }
234
235 //2. Try to read primary track indices.
236 const AliHLTComponentBlockData* p = GetFirstInputBlock(kAliHLTDataTypePrimaryFinder
237 | kAliHLTDataOriginOut);
238 if (!p || !p->fSize || !p->fPtr) {
239 HLTError("Array of primary track indices expected");
240 return false;
241 }
242
243 //Data block from primary finder
244 const PrimaryFinderBlock* blk = static_cast<PrimaryFinderBlock*>(p->fPtr);
245 //Track ids must be positive integers.
246 if (blk->fMinPrimID < 0 || blk->fMaxPrimID < 0) {
247 HLTError("Got negative track ID from primary finder, internal HLT error");
248 return false;
249 }
250
251 //3. Got correct data, modify the component's state.
252 //KF vertex.
253 fPrimaryVtx = *kfVtx;
254 //Primary tracks.
255 fNPrimaryTracks = blk->fNPrimaryTracks;
256 fMinPrimID = blk->fMinPrimID;
257 fMaxPrimID = blk->fMaxPrimID;
258
259 fPrimaryTracks.assign(fMaxPrimID + 1, 0);
260 for (int i = 0; i < fNPrimaryTracks; ++i)
261 fPrimaryTracks[blk->fPrimTrackIds[i]] = 1;
262
263 return true;
264}
265
266//________________________________________________________________________
267bool AliHLTV0FinderComponent::ReadTracks()
268{
269 //The logic, how vertex finder reads input tracks,
270 //is taken from the original global vertexer.
271 //First, try to read tracks from ESD event.
272 ReadESDTracks();
273 if (fTrackInfos.size()) {
274 FindPrimaryDeviations();
275 return true;
276 }
277
278 //No good esd tracks, try:
279 ReadHLTTracks(kAliHLTDataTypeTrack | kAliHLTDataOriginITS);
280 if (fTrackInfos.size()) {
281 FindPrimaryDeviations();
282 return true;
283 }
284
285 //If no good its tracks, try:
286 ReadHLTTracks(kAliHLTDataTypeTrack | kAliHLTDataOriginTPC);
287 if (fTrackInfos.size()) {
288 FindPrimaryDeviations();
289 return true;
290 }
291
292 HLTError("No input tracks found for V0 finder");
293
294 return false;
295}
296
297//________________________________________________________________________
298void AliHLTV0FinderComponent::FindPrimaryDeviations()
299{
300 //Quite a tricky part.
301 for (VectorSize_t i = 0; i < fTrackInfos.size(); ++i) {
302 AliHLTTrackInfo& info = fTrackInfos[i];
303 if (IsPrimaryTrack(info.fID)) {
304 info.fPrimUsed = true;
305 //The way primary deviation is computed in primary finder:
306 if (fNPrimaryTracks <= 20) {
307 AliKFVertex tmp(fPrimaryVtx - info.fParticle);
308 info.fPrimDeviation = info.fParticle.GetDeviationFromVertex(tmp);
309 } else
310 info.fPrimDeviation = info.fParticle.GetDeviationFromVertex(fPrimaryVtx);
311 } else {
312 info.fPrimUsed = false;
313 info.fPrimDeviation = info.fParticle.GetDeviationFromVertex(fPrimaryVtx);
314 }
315 }
316}
317
318//________________________________________________________________________
319bool AliHLTV0FinderComponent::IsPrimaryTrack(int id)const
320{
321 if (id < fMinPrimID || id > fMaxPrimID)
322 return false;
323
324 return fPrimaryTracks[id];
325}
326
327//________________________________________________________________________
328void AliHLTV0FinderComponent::FindV0s()
329{
330 //Here's the core.
331 if (fPrimaryVtx.GetNContributors() < 3)
332 return;
333
334 fV0s.clear();
335 fV0s.push_back(0); //Number of v0s.
336
337 for (int iTr = 0, ei = fTrackInfos.size(); iTr < ei; ++iTr) {
338 AliHLTTrackInfo& info = fTrackInfos[iTr];
339 if (info.fParticle.GetQ() > 0)
340 continue;
341 if (info.fPrimDeviation < fDaughterPrimDeviation)
342 continue;
343
344 for (int jTr = 0; jTr < ei; ++jTr) {
345 AliHLTTrackInfo& jnfo = fTrackInfos[jTr];
346 if (jnfo.fParticle.GetQ() < 0)
347 continue;
348 if (jnfo.fPrimDeviation < fDaughterPrimDeviation)
349 continue;
350
351 //Check if the particles fit
352 if (info.fParticle.GetDeviationFromParticle(jnfo.fParticle) > fChi)
353 continue;
354
355 //Construct V0 mother
356 AliKFParticle v0(info.fParticle, jnfo.fParticle /*, bGammaFinder*/);
357 //Check V0 Chi^2
358 if (v0.GetChi2() < 0. || v0.GetChi2() > fChi * fChi * v0.GetNDF())
359 continue;
360
361 //Subtruct daughters from primary vertex
362 AliKFVertex primVtxCopy(fPrimaryVtx);
363
364 if (info.fPrimUsed) {
365 if (primVtxCopy.GetNContributors() <= 2)
366 continue;
367 primVtxCopy -= info.fParticle;
368 }
369
370 if (jnfo.fPrimUsed) {
371 if (primVtxCopy.GetNContributors() <= 2)
372 continue;
373 primVtxCopy -= jnfo.fParticle;
374 }
375
376 //Check v0 Chi^2 deviation from primary vertex
377 if (v0.GetDeviationFromVertex(primVtxCopy) > fPrimDeviation)
378 continue;
379 //Add V0 to primary vertex to improve the primary vertex resolution
380 primVtxCopy += v0;
381 //Set production vertex for V0
382 v0.SetProductionVertex(primVtxCopy);
383 //Get V0 decay length with estimated error
384 double length = 0., sigmaLength = 0.;
385 if (v0.GetDecayLength(length, sigmaLength))
386 continue;
387 //Reject V0 if it decays too close[sigma] to the primary vertex
388 if (length < fDecayLengthInSigmas * sigmaLength)
389 continue;
390 //Keep v0
130ddc9e 391 fV0s.push_back(info.fID);
392 fV0s.push_back(jnfo.fID);
f078d002 393
394 fV0s[0] += 1;
395 }
396 }
397}
398
399//________________________________________________________________________
400int AliHLTV0FinderComponent::DoOutput()
401{
402 //Save V0s' track pairs' indices.
403 if (!fV0s.size() || !fV0s[0]) {
404 HLTInfo("No v0s were found");
405 return 0;
406 }
407
408 //Indices of primary tracks.
409 return PushBack(&fV0s[0], fV0s.size() * sizeof(int),
410 kAliHLTDataTypeV0Finder | kAliHLTDataOriginOut);
411}