- Vertex using Vertex() method.

[u/mrichter/AliRoot.git] / EMCAL / AliEMCALGetter.cxx

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 * Author: The ALICE Off-line Project.                                    *
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/* $Id:  */
/* $Log:
   29.05.2001 Yuri Kharlov:
              Everywhere reading the treese TTree->GetEvent(i)
              is replaced by reading the branches TBranch->GetEntry(0)
*/

/* $Log:
   08.2002 Dmitri Peressounko:
*/

//_________________________________________________________________________
//  A singleton. This class should be used in the analysis stage to get 
//  reconstructed objects: Digits, RecPoints, TrackSegments and RecParticles,
//  instead of directly reading them from galice.root file. This container 
//  ensures, that one reads Digits, made of these particular digits, RecPoints,
//  made of these particular RecPoints, TrackSegments and RecParticles. 
//  This becomes non trivial if there are several identical branches, produced with
//  different set of parameters. 
//
//  An example of how to use (see also class AliEMCALAnalyser):
//  AliEMCALGetter * gime = AliEMCALGetter::GetInstance("galice.root","test") ;
//  for(Int_t irecp = 0; irecp < gime->NRecParticles() ; irecp++)
//     AliEMCALRecParticle * part = gime->RecParticle(1) ;
//     ................
//  please->GetEvent(event) ;    // reads new event from galice.root
//                  
//*-- Author: Yves Schutz (SUBATECH) & Dmitri Peressounko (RRC KI & SUBATECH)
//*--         Completely redesigned by Dmitri Peressounko March 2001  
//
//*-- YS June 2001 : renamed the original AliEMCALIndexToObject and make
//*--         systematic usage of TFolders without changing the interface     
//*-- YS August 2002 : clone PHOS as closely as possible and intoduction