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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 | // Container class for AliGenerator through recursion. | |
19 | // Container is itself an AliGenerator. | |
20 | // What is stored are not the pointers to the generators directly but to objects of type | |
21 | // AliGenCocktail entry. | |
22 | // The class provides also iterator functionality. | |
23 | // Author: andreas.morsch@cern.ch | |
24 | // | |
25 | ||
26 | #include <TList.h> | |
27 | #include <TObjArray.h> | |
28 | ||
29 | #include "AliGenCocktail.h" | |
30 | #include "AliGenCocktailEntry.h" | |
31 | #include "AliCollisionGeometry.h" | |
32 | #include "AliRun.h" | |
33 | #include "AliMC.h" | |
34 | #include "AliGenCocktailEventHeader.h" | |
35 | ||
36 | ClassImp(AliGenCocktail) | |
37 | ||
38 | AliGenCocktail::AliGenCocktail() | |
39 | :AliGenerator(), | |
40 | fNGenerators(0), | |
41 | fTotalRate(0.), | |
42 | fRandom(kFALSE), | |
43 | fUsePerEventRate(kFALSE), | |
44 | fProb(0), | |
45 | fEntries(0), | |
46 | flnk1(0), | |
47 | flnk2(0), | |
48 | fHeader(0) | |
49 | { | |
50 | // Constructor | |
51 | fName = "Cocktail"; | |
52 | fTitle= "Particle Generator using cocktail of generators"; | |
53 | } | |
54 | ||
55 | AliGenCocktail::~AliGenCocktail() | |
56 | { | |
57 | // Destructor | |
58 | delete fEntries; | |
59 | fEntries = 0; | |
60 | // delete fHeader; // It is removed in AliRunLoader | |
61 | fHeader = 0; | |
62 | } | |
63 | ||
64 | void AliGenCocktail:: | |
65 | AddGenerator(AliGenerator *Generator, const char* Name, Float_t RateExp) | |
66 | { | |
67 | // | |
68 | // Add a generator to the list | |
69 | // First check that list exists | |
70 | if (!fEntries) fEntries = new TList(); | |
71 | fTotalRate += RateExp; | |
72 | // | |
73 | // Forward parameters to the new generator | |
74 | if(TestBit(kPtRange) && !(Generator->TestBit(kPtRange)) && !(Generator->TestBit(kMomentumRange))) | |
75 | Generator->SetPtRange(fPtMin,fPtMax); | |
76 | if(TestBit(kMomentumRange) && !(Generator->TestBit(kPtRange)) && !(Generator->TestBit(kMomentumRange))) | |
77 | Generator->SetMomentumRange(fPMin,fPMax); | |
78 | ||
79 | if (!(Generator->TestBit(kYRange))) | |
80 | Generator->SetYRange(fYMin,fYMax); | |
81 | if (!(Generator->TestBit(kPhiRange))) | |
82 | Generator->SetPhiRange(fPhiMin*180/TMath::Pi(),fPhiMax*180/TMath::Pi()); | |
83 | if (!(Generator->TestBit(kThetaRange))) | |
84 | Generator->SetThetaRange(fThetaMin*180/TMath::Pi(),fThetaMax*180/TMath::Pi()); | |
85 | if (!(Generator->TestBit(kVertexRange))) { | |
86 | Generator->SetOrigin(fOrigin[0], fOrigin[1], fOrigin[2]); | |
87 | Generator->SetSigma(fOsigma[0], fOsigma[1], fOsigma[2]); | |
88 | Generator->SetVertexSmear(fVertexSmear); | |
89 | Generator->SetVertexSource(kContainer); | |
90 | } | |
91 | Generator->SetTrackingFlag(fTrackIt); | |
92 | Generator->SetContainer(this); | |
93 | ||
94 | ||
95 | // | |
96 | // Add generator to list | |
97 | char theName[256]; | |
98 | sprintf(theName, "%s_%d",Name, fNGenerators); | |
99 | Generator->SetName(theName); | |
100 | ||
101 | AliGenCocktailEntry *entry = | |
102 | new AliGenCocktailEntry(Generator, Name, RateExp); | |
103 | ||
104 | fEntries->Add(entry); | |
105 | fNGenerators++; | |
106 | flnk1 = 0; | |
107 | flnk2 = 0; | |
108 | fRandom = kFALSE; | |
109 | fHeader = 0; | |
110 | } | |
111 | ||
112 | void AliGenCocktail::Init() | |
113 | { | |
114 | // Initialisation | |
115 | TIter next(fEntries); | |
116 | AliGenCocktailEntry *entry; | |
117 | // | |
118 | // Loop over generators and initialize | |
119 | while((entry = (AliGenCocktailEntry*)next())) { | |
120 | if (fStack) entry->Generator()->SetStack(fStack); | |
121 | entry->Generator()->Init(); | |
122 | } | |
123 | ||
124 | next.Reset(); | |
125 | ||
126 | if (fRandom) { | |
127 | fProb.Set(fNGenerators); | |
128 | next.Reset(); | |
129 | Float_t sum = 0.; | |
130 | while((entry = (AliGenCocktailEntry*)next())) { | |
131 | sum += entry->Rate(); | |
132 | } | |
133 | ||
134 | next.Reset(); | |
135 | Int_t i = 0; | |
136 | Float_t psum = 0.; | |
137 | while((entry = (AliGenCocktailEntry*)next())) { | |
138 | psum += entry->Rate() / sum; | |
139 | fProb[i++] = psum; | |
140 | } | |
141 | } | |
142 | next.Reset(); | |
143 | } | |
144 | ||
145 | void AliGenCocktail::FinishRun() | |
146 | { | |
147 | // Initialisation | |
148 | TIter next(fEntries); | |
149 | AliGenCocktailEntry *entry; | |
150 | // | |
151 | // Loop over generators and initialize | |
152 | while((entry = (AliGenCocktailEntry*)next())) { | |
153 | entry->Generator()->FinishRun(); | |
154 | } | |
155 | } | |
156 | ||
157 | void AliGenCocktail::Generate() | |
158 | { | |
159 | // | |
160 | // Generate event | |
161 | TIter next(fEntries); | |
162 | AliGenCocktailEntry *entry = 0; | |
163 | AliGenCocktailEntry *preventry = 0; | |
164 | AliGenerator* gen = 0; | |
165 | if (fHeader) delete fHeader; | |
166 | ||
167 | ||
168 | fHeader = new AliGenCocktailEventHeader("Cocktail Header"); | |
169 | ||
170 | const TObjArray *partArray = gAlice->GetMCApp()->Particles(); | |
171 | ||
172 | // | |
173 | // Generate the vertex position used by all generators | |
174 | // | |
175 | if(fVertexSmear == kPerEvent) Vertex(); | |
176 | ||
177 | TArrayF eventVertex; | |
178 | eventVertex.Set(3); | |
179 | for (Int_t j=0; j < 3; j++) eventVertex[j] = fVertex[j]; | |
180 | ||
181 | if (!fRandom) { | |
182 | // | |
183 | // Loop over generators and generate events | |
184 | Int_t igen=0; | |
185 | while((entry = (AliGenCocktailEntry*)next())) { | |
186 | if (fUsePerEventRate && (gRandom->Rndm() > entry->Rate())) continue; | |
187 | ||
188 | igen++; | |
189 | if (igen ==1) { | |
190 | entry->SetFirst(0); | |
191 | } else { | |
192 | entry->SetFirst((partArray->GetEntriesFast())+1); | |
193 | } | |
194 | // | |
195 | // Handle case in which current generator needs collision geometry from previous generator | |
196 | // | |
197 | gen = entry->Generator(); | |
198 | if (gen->NeedsCollisionGeometry()) | |
199 | { | |
200 | if (preventry && preventry->Generator()->ProvidesCollisionGeometry()) | |
201 | { | |
202 | gen->SetCollisionGeometry(preventry->Generator()->CollisionGeometry()); | |
203 | } else { | |
204 | Fatal("Generate()", "No Collision Geometry Provided"); | |
205 | } | |
206 | } | |
207 | entry->Generator()->SetVertex(fVertex.At(0), fVertex.At(1), fVertex.At(2)); | |
208 | entry->Generator()->Generate(); | |
209 | entry->SetLast(partArray->GetEntriesFast()); | |
210 | preventry = entry; | |
211 | } | |
212 | } else if (fRandom) { | |
213 | // | |
214 | // Select a generator randomly | |
215 | // | |
216 | Int_t i; | |
217 | Float_t p0 = gRandom->Rndm(); | |
218 | ||
219 | for (i = 0; i < fNGenerators; i++) { | |
220 | if (p0 < fProb[i]) break; | |
221 | } | |
222 | ||
223 | entry = (AliGenCocktailEntry*) fEntries->At(i); | |
224 | entry->SetFirst(0); | |
225 | gen = entry->Generator(); | |
226 | entry->Generator()->SetVertex(fVertex.At(0), fVertex.At(1), fVertex.At(2)); | |
227 | entry->Generator()->Generate(); | |
228 | entry->SetLast(partArray->GetEntriesFast()); | |
229 | } | |
230 | ||
231 | next.Reset(); | |
232 | ||
233 | // Event Vertex | |
234 | fHeader->SetPrimaryVertex(eventVertex); | |
235 | fHeader->CalcNProduced(); | |
236 | gAlice->SetGenEventHeader(fHeader); | |
237 | } | |
238 | ||
239 | void AliGenCocktail::SetVertexSmear(VertexSmear_t smear) | |
240 | { | |
241 | // Set vertex smearing and propagate it to the generators | |
242 | ||
243 | AliGenerator::SetVertexSmear(smear); | |
244 | TIter next(fEntries); | |
245 | while (AliGenCocktailEntry* entry = (AliGenCocktailEntry*)next()) { | |
246 | entry->Generator()->SetVertexSmear(smear); | |
247 | } | |
248 | } | |
249 | ||
250 | AliGenCocktailEntry * AliGenCocktail::FirstGenerator() | |
251 | { | |
252 | // Iterator over generators: Initialisation | |
253 | flnk1 = fEntries->FirstLink(); | |
254 | if (flnk1) { | |
255 | return (AliGenCocktailEntry*) (flnk1->GetObject()); | |
256 | } else { | |
257 | return 0; | |
258 | } | |
259 | } | |
260 | ||
261 | AliGenCocktailEntry* AliGenCocktail::NextGenerator() | |
262 | { | |
263 | // Iterator over generators: Increment | |
264 | flnk1 = flnk1->Next(); | |
265 | if (flnk1) { | |
266 | return (AliGenCocktailEntry*) (flnk1->GetObject()); | |
267 | } else { | |
268 | return 0; | |
269 | } | |
270 | } | |
271 | ||
272 | void AliGenCocktail:: | |
273 | FirstGeneratorPair(AliGenCocktailEntry*& e1, AliGenCocktailEntry*& e2) | |
274 | { | |
275 | // Iterator over generator pairs: Initialisation | |
276 | flnk2 = flnk1 = fEntries->FirstLink(); | |
277 | if (flnk1) { | |
278 | e2 = e1 = (AliGenCocktailEntry*) (flnk1->GetObject()); | |
279 | } else { | |
280 | e2= e1 = 0; | |
281 | } | |
282 | } | |
283 | ||
284 | void AliGenCocktail:: | |
285 | NextGeneratorPair(AliGenCocktailEntry*& e1, AliGenCocktailEntry*& e2) | |
286 | { | |
287 | // Iterator over generators: Increment | |
288 | flnk2 = flnk2->Next(); | |
289 | if (flnk2) { | |
290 | e1 = (AliGenCocktailEntry*) (flnk1->GetObject()); | |
291 | e2 = (AliGenCocktailEntry*) (flnk2->GetObject()); | |
292 | } else { | |
293 | flnk2 = flnk1 = flnk1->Next(); | |
294 | if (flnk1) { | |
295 | e1 = (AliGenCocktailEntry*) (flnk1->GetObject()); | |
296 | e2 = (AliGenCocktailEntry*) (flnk2->GetObject()); | |
297 | } else { | |
298 | e1=0; | |
299 | e2=0; | |
300 | } | |
301 | } | |
302 | } | |
303 | ||
304 | void AliGenCocktail::AddHeader(AliGenEventHeader* header) | |
305 | { | |
306 | // Add a header to the list | |
307 | if (fHeader) fHeader->AddHeader(header); | |
308 | } | |
309 | ||
310 | ||
311 | ||
312 |