X-Git-Url: http://git.uio.no/git/?a=blobdiff_plain;f=EVGEN%2FAliGenReaderTreeK.cxx;h=62614be4b2f845d85cef2d29c906e060fbef4c0e;hb=e56016a002d38069843e4a32174ba6404f0883e9;hp=241139fa81cbd03ed239c6e3ab651c8c50b088b3;hpb=198bb1c7ab5437cd36dc37692d7ad850220b43fd;p=u%2Fmrichter%2FAliRoot.git

diff --git a/EVGEN/AliGenReaderTreeK.cxx b/EVGEN/AliGenReaderTreeK.cxx
index 241139fa81c..62614be4b2f 100644
--- a/EVGEN/AliGenReaderTreeK.cxx
+++ b/EVGEN/AliGenReaderTreeK.cxx
@@ -14,7 +14,13 @@
  **************************************************************************/
 
 /* $Id$ */
-
+//
+// Realisation of AliGenReader to be used with AliGenExtFile
+// It reads events from a kinematics TreeK.
+// NextEvent() is used to loop over events 
+// and NextParticle() to loop over particles.  
+// Author: andreas.morsch@cern.ch
+//
 #include <TFile.h>
 #include <TTree.h>
 #include <TParticle.h>
@@ -24,9 +30,10 @@
 #include "AliGenReaderTreeK.h"
 #include "AliHeader.h"
 #include "AliRun.h"
+#include "AliStack.h"
 #include "AliRunLoader.h"
 
-ClassImp(AliGenReaderTreeK);
+ClassImp(AliGenReaderTreeK)
 
 const TString AliGenReaderTreeK::fgkEventFolderName("GenReaderTreeK");
 
@@ -73,7 +80,7 @@ void AliGenReaderTreeK::Init()
 // Initialization
 // Connect base file and file to read from
 
-    TTree *ali = gAlice->TreeE();
+    TTree *ali = AliRunLoader::Instance()->TreeE();
     if (ali) {
       fBaseFile = ali->GetCurrentFile();
     } else {
@@ -153,7 +160,7 @@ AliGenReaderTreeK& AliGenReaderTreeK::operator=(const  AliGenReaderTreeK& rhs)
     return *this;
 }
 
-void AliGenReaderTreeK::Copy(AliGenReaderTreeK&) const
+void AliGenReaderTreeK::Copy(TObject&) const
 {
     //
     // Copy 
@@ -165,6 +172,8 @@ void AliGenReaderTreeK::Copy(AliGenReaderTreeK&) const
 
 TString& AliGenReaderTreeK::GetDirName(Int_t entry)
  {
+// Get the current directory name
+
    TString* retval;//return value
    if (fDirs ==  0x0)
     {
@@ -207,3 +216,9 @@ void AliGenReaderTreeK::AddDir(const char* dirname)
   TObjString *odir= new TObjString(dirname);
   fDirs->Add(odir);
 }
+
+TParticle* AliGenReaderTreeK::GetParticle(Int_t i)
+ {
+  if (fStack && i<fNp) return fStack->Particle(i);
+  return 0x0;
+ }