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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 | // Realisation of AliGenReader to be used with AliGenExtFile | |
19 | // It reads events from a kinematics TreeK. | |
20 | // NextEvent() is used to loop over events | |
21 | // and NextParticle() to loop over particles. | |
22 | // Author: andreas.morsch@cern.ch | |
23 | // | |
24 | #include <TFile.h> | |
25 | #include <TTree.h> | |
26 | #include <TParticle.h> | |
27 | #include <TObjString.h> | |
28 | #include <TObjArray.h> | |
29 | ||
30 | #include "AliGenReaderTreeK.h" | |
31 | #include "AliHeader.h" | |
32 | #include "AliRun.h" | |
33 | #include "AliStack.h" | |
34 | #include "AliRunLoader.h" | |
35 | ||
36 | ClassImp(AliGenReaderTreeK) | |
37 | ||
38 | const TString AliGenReaderTreeK::fgkEventFolderName("GenReaderTreeK"); | |
39 | ||
40 | AliGenReaderTreeK::AliGenReaderTreeK(): | |
41 | AliGenReader(), | |
42 | fNcurrent(0), | |
43 | fNparticle(0), | |
44 | fNp(0), | |
45 | fInRunLoader(0), | |
46 | fBaseFile(0), | |
47 | fStack(0), | |
48 | fOnlyPrimaries(kFALSE), | |
49 | fDirs(0x0), | |
50 | fCurrentDir(0) | |
51 | { | |
52 | // Default constructor | |
53 | } | |
54 | ||
55 | AliGenReaderTreeK::AliGenReaderTreeK(const AliGenReaderTreeK &reader): | |
56 | AliGenReader(reader), | |
57 | fNcurrent(0), | |
58 | fNparticle(0), | |
59 | fNp(0), | |
60 | fInRunLoader(0), | |
61 | fBaseFile(0), | |
62 | fStack(0), | |
63 | fOnlyPrimaries(kFALSE), | |
64 | fDirs(0x0), | |
65 | fCurrentDir(0) | |
66 | { | |
67 | reader.Copy(*this); | |
68 | } | |
69 | ||
70 | ||
71 | AliGenReaderTreeK::~AliGenReaderTreeK() | |
72 | { | |
73 | // Destructor | |
74 | delete fInRunLoader;//it cleans all the loaded data | |
75 | delete fDirs; | |
76 | } | |
77 | ||
78 | void AliGenReaderTreeK::Init() | |
79 | { | |
80 | // Initialization | |
81 | // Connect base file and file to read from | |
82 | ||
83 | TTree *ali = AliRunLoader::Instance()->TreeE(); | |
84 | if (ali) { | |
85 | fBaseFile = ali->GetCurrentFile(); | |
86 | } else { | |
87 | printf("\n Warning: Basefile cannot be found !\n"); | |
88 | } | |
89 | //if (!fFile) fFile = new TFile(fFileName); | |
90 | if (fInRunLoader == 0x0) | |
91 | { | |
92 | fInRunLoader = AliRunLoader::Open((GetDirName(fCurrentDir++)+"/")+fFileName,fgkEventFolderName); | |
93 | fInRunLoader->LoadHeader(); | |
94 | fInRunLoader->LoadKinematics("READ"); | |
95 | } | |
96 | } | |
97 | ||
98 | Int_t AliGenReaderTreeK::NextEvent() | |
99 | { | |
100 | // Read the next event | |
101 | // cd to file with old kine tree | |
102 | if (!fBaseFile) Init(); | |
103 | // Get next event | |
104 | ||
105 | if (fNcurrent >= fInRunLoader->GetNumberOfEvents()) | |
106 | { | |
107 | if (fCurrentDir >= fDirs->GetEntries()) | |
108 | { | |
109 | Warning("NextEvent","No more events"); | |
110 | return 0; | |
111 | } | |
112 | delete fInRunLoader; | |
113 | fInRunLoader = AliRunLoader::Open((GetDirName(fCurrentDir++)+"/")+fFileName,fgkEventFolderName); | |
114 | fInRunLoader->LoadHeader(); | |
115 | fInRunLoader->LoadKinematics("READ"); | |
116 | fNcurrent = 0; | |
117 | } | |
118 | fInRunLoader->GetEvent(fNcurrent); | |
119 | fStack = fInRunLoader->Stack(); | |
120 | ||
121 | // cd back to base file | |
122 | fBaseFile->cd(); | |
123 | // | |
124 | fNcurrent++; | |
125 | fNparticle = 0; | |
126 | fNp = fStack->GetNtrack(); | |
127 | printf("\n Next event contains %d particles", fNp); | |
128 | // | |
129 | return fNp; | |
130 | } | |
131 | ||
132 | TParticle* AliGenReaderTreeK::NextParticle() | |
133 | { | |
134 | //Return next particle | |
135 | TParticle* part = GetParticle(fNparticle++); | |
136 | if (part == 0x0) return 0x0; | |
137 | //if only primaries are to be read, and this particle is not primary enter loop | |
138 | if (fOnlyPrimaries && ( part->GetFirstMother() > -1) ) | |
139 | for (;;) | |
140 | { //look for a primary | |
141 | part = GetParticle(fNparticle++); | |
142 | if (part == 0x0) return 0x0; | |
143 | if (part->GetFirstMother() == -1) return part; | |
144 | } | |
145 | ||
146 | return part; | |
147 | } | |
148 | ||
149 | void AliGenReaderTreeK::RewindEvent() | |
150 | { | |
151 | // Go back to the first particle of the event | |
152 | fNparticle = 0; | |
153 | } | |
154 | ||
155 | ||
156 | AliGenReaderTreeK& AliGenReaderTreeK::operator=(const AliGenReaderTreeK& rhs) | |
157 | { | |
158 | // Assignment operator | |
159 | rhs.Copy(*this); | |
160 | return *this; | |
161 | } | |
162 | ||
163 | void AliGenReaderTreeK::Copy(TObject&) const | |
164 | { | |
165 | // | |
166 | // Copy | |
167 | // | |
168 | Fatal("Copy","Not implemented!\n"); | |
169 | } | |
170 | ||
171 | ||
172 | ||
173 | TString& AliGenReaderTreeK::GetDirName(Int_t entry) | |
174 | { | |
175 | // Get the current directory name | |
176 | ||
177 | TString* retval;//return value | |
178 | if (fDirs == 0x0) | |
179 | { | |
180 | retval = new TString("."); | |
181 | return *retval; | |
182 | } | |
183 | ||
184 | if ( (entry>fDirs->GetEntries()) || (entry<0))//if out of bounds return empty string | |
185 | { //note that entry==0 is accepted even if array is empty (size=0) | |
186 | Error("GetDirName","Name out of bounds"); | |
187 | retval = new TString(); | |
188 | return *retval; | |
189 | } | |
190 | ||
191 | if (fDirs->GetEntries() == 0) | |
192 | { | |
193 | retval = new TString("."); | |
194 | return *retval; | |
195 | } | |
196 | ||
197 | TObjString *dir = dynamic_cast<TObjString*>(fDirs->At(entry)); | |
198 | if(dir == 0x0) | |
199 | { | |
200 | Error("GetDirName","Object in TObjArray is not a TObjString or its descendant"); | |
201 | retval = new TString(); | |
202 | return *retval; | |
203 | } | |
204 | if (gDebug > 0) Info("GetDirName","Returned ok %s",dir->String().Data()); | |
205 | return dir->String(); | |
206 | } | |
207 | ||
208 | void AliGenReaderTreeK::AddDir(const char* dirname) | |
209 | { | |
210 | //adds a directory to the list of directories where data are looked for | |
211 | if(fDirs == 0x0) | |
212 | { | |
213 | fDirs = new TObjArray(); | |
214 | fDirs->SetOwner(kTRUE); | |
215 | } | |
216 | TObjString *odir= new TObjString(dirname); | |
217 | fDirs->Add(odir); | |
218 | } | |
219 | ||
220 | TParticle* AliGenReaderTreeK::GetParticle(Int_t i) | |
221 | { | |
222 | if (fStack && i<fNp) return fStack->Particle(i); | |
223 | return 0x0; | |
224 | } |