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14 **************************************************************************/
16 // $Id: AliEvent.cxx,v 1.6 2002/04/26 11:23:37 nick Exp $
18 ///////////////////////////////////////////////////////////////////////////
20 // Creation and investigation of an Alice physics event.
21 // An AliEvent can be constructed by adding AliTracks, Alivertices, AliJets
22 // and/or AliCalorimeters.
24 // The basic functionality of AliEvent is identical to the one of AliVertex.
25 // So, an AliEvent may be used as the primary vertex with some additional
26 // functionality compared to AliVertex.
28 // To provide maximal flexibility to the user, the two modes of track/jet/vertex
29 // storage as described in AliJet and AliVertex can be used.
30 // In addition an identical structure is provided for the storage of AliCalorimeter
31 // objects, which can be selected by means of the memberfunction SetCalCopy().
33 // a) SetCalCopy(0) (which is the default).
34 // Only the pointers of the 'added' calorimeters are stored.
35 // This mode is typically used by making cal. studies based on a fixed set
36 // of calorimeters which stays under user control or is kept on an external
38 // In this way the AliEvent just represents a 'logical structure' for the
42 // Modifications made to the original calorimeters also affect the AliCalorimeter
43 // objects which are stored in the AliEvent.
46 // Of every 'added' calorimeter a private copy will be made of which the pointer
48 // In this way the AliEvent represents an entity on its own and modifications
49 // made to the original calorimeters do not affect the AliCalorimeter objects
50 // which are stored in the AliEvent.
51 // This mode will allow 'adding' many different AliCalorimeters into an AliEvent by
52 // creating only one AliCalorimeter instance in the main programme and using the
53 // AliCalorimeter::Reset() and AliCalorimeter parameter setting memberfunctions.
55 // See also the documentation provided for the memberfunction SetOwner().
57 // Coding example to make an event consisting of a primary vertex,
58 // 2 secondary vertices and a calorimeter.
59 // --------------------------------------------------------------
60 // vp contains the tracks 1,2,3 and 4 (primary vertex)
61 // v1 contains the tracks 5,6 and 7 (sec. vertex)
62 // v2 contains the jets 1 and 2 (sec. vertex)
66 // Specify the event object as the repository of all objects
67 // for the event building and physics analysis.
70 // evt.SetTrackCopy(1);
72 // Fill the event structure with the basic objects
74 // AliCalorimeter emcal;
76 // ... // code to fill the calorimeter data
79 // evt.AddCalorimeter(emcal);
81 // AliTrack* tx=new AliTrack();
82 // for (Int_t i=0; i<10; i++)
85 // ... // code to fill the track data
97 // Build the event structure (vertices, jets, ...) for physics analysis
98 // based on the basic objects from the event repository.
101 // for (Int_t i=0; i<evt.GetNtracks(); i++)
103 // tx=evt.GetTrack(i);
105 // ... // code to fill the jet data
110 // tx=evt.GetTrack(1);
112 // tx=evt.GetTrack(2);
114 // tx=evt.GetTrack(3);
116 // tx=evt.GetTrack(4);
119 // Float_t rp[3]={2.4,0.1,-8.5};
120 // vp.SetPosition(rp,"car");
123 // tx=evt.GetTrack(5);
125 // tx=evt.GetTrack(6);
127 // tx=evt.GetTrack(7);
130 // Float_t r1[3]={1.6,-3.2,5.7};
131 // v1.SetPosition(r1,"car");
139 // Float_t r2[3]={6.2,4.8,1.3};
140 // v2.SetPosition(r2,"car");
142 // Specify the vertices v1 and v2 as secondary vertices of the primary
144 // vp.SetVertexCopy(1);
148 // Enter the physics structures into the event
149 // evt.SetVertexCopy(1);
150 // evt.AddVertex(vp,0);
152 // The jets j1 and j2 are already available via sec. vertex v2,
153 // but can be made available also from the event itself if desired.
164 // Float_t etot=evt.GetEnergy();
165 // Ali3Vector ptot=evt.Get3Momentum();
167 // evt.GetPosition(loc,"sph");
168 // AliPosition r=v1.GetPosition();
170 // Int_t nt=v2.GetNtracks();
171 // AliTrack* tv=v2.GetTrack(1); // Access track number 1 of Vertex v2
175 // Int_t nv=evt.GetNvtx();
176 // AliVertex* vx=evt.GetVertex(1); // Access primary vertex
177 // Float_t e=vx->GetEnergy();
179 // Float_t M=evt.GetInvmass();
181 // Reconstruct the event from scratch
184 // evt.SetNvmax(25); // Increase initial no. of sec. vertices
186 // ... // code to create tracks etc...
189 // Note : All quantities are in GeV, GeV/c or GeV/c**2
191 //--- Author: Nick van Eijndhoven 27-may-2001 UU-SAP Utrecht
192 //- Modified: NvE $Date: 2002/04/26 11:23:37 $ UU-SAP Utrecht
193 ///////////////////////////////////////////////////////////////////////////
195 #include "AliEvent.h"
197 ClassImp(AliEvent) // Class implementation to enable ROOT I/O
201 // Default constructor.
202 // All variables initialised to default values.
216 ///////////////////////////////////////////////////////////////////////////
217 AliEvent::AliEvent(Int_t n): AliVertex(n)
219 // Create an event to hold initially a maximum of n tracks
220 // All variables initialised to default values
221 cout << "AliEvent init with n = " << n << endl;
235 ///////////////////////////////////////////////////////////////////////////
236 AliEvent::~AliEvent()
238 // Default destructor
241 delete fCalorimeters;
245 ///////////////////////////////////////////////////////////////////////////
246 void AliEvent::Reset()
248 // Reset all variables to default values
249 // The max. number of tracks is set to the initial value again
250 // The max. number of vertices is set to the default value again
251 // Note : The CalCopy mode is maintained as it was set by the user before.
265 delete fCalorimeters;
271 ///////////////////////////////////////////////////////////////////////////
272 void AliEvent::SetOwner(Bool_t own)
274 // Set ownership of all added objects.
275 // The default parameter is own=kTRUE.
277 // Invokation of this memberfunction also sets all the copy modes
278 // (e.g. TrackCopy & co.) according to the value of own.
280 // This function (with own=kTRUE) is particularly useful when reading data
281 // from a tree/file, since Reset() will then actually remove all the
282 // added objects from memory irrespective of the copy mode settings
283 // during the tree/file creation process. In this way it provides a nice way
284 // of preventing possible memory leaks in the reading/analysis process.
286 // In addition this memberfunction can also be used as a shortcut to set all
287 // copy modes in one go during a tree/file creation process.
288 // However, in this case the user has to take care to only set/change the
289 // ownership (and copy mode) for empty objects (e.g. newly created objects
290 // or after invokation of the Reset() memberfunction) otherwise it will
291 // very likely result in inconsistent destructor behaviour.
295 if (fCalorimeters) fCalorimeters->SetOwner(own);
298 AliVertex::SetOwner(own);
300 ///////////////////////////////////////////////////////////////////////////
301 void AliEvent::SetDayTime(TDatime& stamp)
303 // Set the date and time stamp for this event
306 ///////////////////////////////////////////////////////////////////////////
307 void AliEvent::SetRunNumber(Int_t run)
309 // Set the run number for this event
312 ///////////////////////////////////////////////////////////////////////////
313 void AliEvent::SetEventNumber(Int_t evt)
315 // Set the event number for this event
318 ///////////////////////////////////////////////////////////////////////////
319 TDatime AliEvent::GetDayTime()
321 // Provide the date and time stamp for this event
324 ///////////////////////////////////////////////////////////////////////////
325 Int_t AliEvent::GetRunNumber()
327 // Provide the run number for this event
330 ///////////////////////////////////////////////////////////////////////////
331 Int_t AliEvent::GetEventNumber()
333 // Provide the event number for this event
336 ///////////////////////////////////////////////////////////////////////////
337 void AliEvent::SetProjectile(Int_t a,Int_t z,Double_t pnuc)
339 // Set the projectile A, Z and momentum value per nucleon.
344 ///////////////////////////////////////////////////////////////////////////
345 Int_t AliEvent::GetProjectileA()
347 // Provide the projectile A value.
350 ///////////////////////////////////////////////////////////////////////////
351 Int_t AliEvent::GetProjectileZ()
353 // Provide the projectile Z value.
356 ///////////////////////////////////////////////////////////////////////////
357 Double_t AliEvent::GetProjectilePnuc()
359 // Provide the projectile momentum value per nucleon.
362 ///////////////////////////////////////////////////////////////////////////
363 void AliEvent::SetTarget(Int_t a,Int_t z,Double_t pnuc)
365 // Set the target A, Z and momentum value per nucleon.
370 ///////////////////////////////////////////////////////////////////////////
371 Int_t AliEvent::GetTargetA()
373 // Provide the target A value.
376 ///////////////////////////////////////////////////////////////////////////
377 Int_t AliEvent::GetTargetZ()
379 // Provide the target Z value.
382 ///////////////////////////////////////////////////////////////////////////
383 Double_t AliEvent::GetTargetPnuc()
385 // Provide the target momentum value per nucleon.
388 ///////////////////////////////////////////////////////////////////////////
389 void AliEvent::HeaderInfo()
391 // Provide event header information
392 Int_t date=fDaytime.GetDate();
393 Int_t time=fDaytime.GetTime();
395 Int_t year=date/10000;
396 Int_t month=(date%10000)/100;
399 Int_t mm=(time%10000)/100;
402 char* c[12]={"jan","feb","mar","apr","may","jun",
403 "jul","aug","sep","oct","nov","dec"};
405 cout << " *AliEvent::Info* Run : " << fRun << " Event : " << fEvent;
407 cout << " Date : " << setw(2) << day << "-" << c[month-1] << "-" << year
408 << " Time : " << setw(2) << hh << ":" << setw(2) << mm << ":" << setw(2) << ss;
410 cout << " Ncalorimeters : " << fNcals << endl;
412 ///////////////////////////////////////////////////////////////////////////
413 void AliEvent::Info(TString f)
415 // Provide event information within the coordinate frame f
419 ///////////////////////////////////////////////////////////////////////////
420 Int_t AliEvent::GetNcalorimeters()
422 // Provide the number of stored calorimeter systems
425 ///////////////////////////////////////////////////////////////////////////
426 void AliEvent::AddCalorimeter(AliCalorimeter& c)
428 // Add a calorimeter system to the event
431 fCalorimeters=new TObjArray();
432 if (fCalCopy) fCalorimeters->SetOwner();
435 // Add the calorimeter system to this event
439 fCalorimeters->AddLast((AliCalorimeter*)c.Clone());
443 fCalorimeters->AddLast(&c);
446 ///////////////////////////////////////////////////////////////////////////
447 void AliEvent::SetCalCopy(Int_t j)
449 // (De)activate the creation of private copies of the added calorimeters.
450 // j=0 ==> No private copies are made; pointers of original cals. are stored.
451 // j=1 ==> Private copies of the cals. are made and these pointers are stored.
453 // Note : Once the storage contains pointer(s) to AliCalorimeter(s) one cannot
454 // change the CalCopy mode anymore.
455 // To change the CalCopy mode for an existing AliEvent containing
456 // calorimeters one first has to invoke Reset().
465 cout << "*AliEvent::SetCalCopy* Invalid argument : " << j << endl;
470 cout << "*AliEvent::SetCalCopy* Storage already contained calorimeters."
471 << " ==> CalCopy mode not changed." << endl;
474 ///////////////////////////////////////////////////////////////////////////
475 Int_t AliEvent::GetCalCopy()
477 // Provide value of the CalCopy mode.
478 // 0 ==> No private copies are made; pointers of original cals. are stored.
479 // 1 ==> Private copies of the cals. are made and these pointers are stored.
482 ///////////////////////////////////////////////////////////////////////////
483 AliCalorimeter* AliEvent::GetCalorimeter(Int_t i)
485 // Return the i-th calorimeter of this event
488 cout << " *AliEvent::GetCalorimeter* No calorimeters present." << endl;
493 if (i<=0 || i>fNcals)
495 cout << " *AliEvent::GetCalorimeter* Invalid argument i : " << i
496 << " Ncals = " << fNcals << endl;
501 return (AliCalorimeter*)fCalorimeters->At(i-1);
505 ///////////////////////////////////////////////////////////////////////////
506 AliCalorimeter* AliEvent::GetCalorimeter(TString name)
508 // Return the calorimeter with name tag "name"
511 cout << " *AliEvent::GetCalorimeter* No calorimeters present." << endl;
518 for (Int_t i=0; i<fNcals; i++)
520 cx=(AliCalorimeter*)fCalorimeters->At(i);
524 if (s == name) return cx;
528 return 0; // No matching name found
531 ///////////////////////////////////////////////////////////////////////////