Adding the CreateXML.C macro that creates a collection of esds by querying the tags.

diff --git a/STEER/CreateXML.C b/STEER/CreateXML.C
new file mode 100644 (file)
index 0000000..3d74636
--- /dev/null
+++ b/STEER/CreateXML.C
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+//_________________________________________________________________________
+// Macro that creates esd xml collections by querying the tags.
+// It addresses the following use cases:
+// o) The tag files are stored locally.
+//   - One queries the tags by using simple string statements.
+//   - One queries the tags by using the corresponding aliroot classes.
+// o) The tag files are stored in the file catalog. 
+//    In this case the first thing we do is to query the f.c.
+//    and extract a collection (xml) of tag files. 
+//   - One queries the tags by using simple string statements.
+//   - One queries the tags by using the corresponding aliroot classes.
+//                                             
+// In all cases you create the xml file by using the CreateXMLCollection
+// of the AliTagAnalysisClass. The first argument of this method is the
+// name of the output xml collection which is stored locally.
+//_________________________________________________________________________
+Bool_t CreateXML() {
+  TStopwatch timer;
+  timer.Start();
+  
+  //needed in the case of the string statements
+  gSystem->Load("libTreePlayer.so");
+
+  // Create A tag analysis object and impose some selection criteria
+  AliTagAnalysis *TagAna = new AliTagAnalysis(); 
+
+  //Case where the tag files are stored locally
+  //TagAna->ChainLocalTags(".");
+
+  //Case where the tag files are stored in the file catalog
+  //pp.xml is the xml collection of tag files that was produced 
+  //by querying the file catalog.
+  TGrid::Connect("alien://pcapiserv01.cern.ch:10000","pchrist");  
+  //TGrid::Connect("alien://"); 
+  TAlienCollection* coll = TAlienCollection::Open("pp.xml");
+  TGridResult* TagResult = coll->GetGridResult("");
+  TagAna->ChainGridTags(TagResult);
+
+  //__________________________//
+  //Usage of string statements//
+  //__________________________//
+  /*const char* fRunCuts = "fAliceRunId == 340";
+  const char* fEventCuts = "(fEventTag.fMaxPt >= 1.0)&&(fEventTag.fNumberOfTracks >= 11)&&(fEventTag.fNumberOfTracks <= 12)";
+  TagAna->CreateXMLCollection("global",fRunCuts,fEventCuts);*/
+
+  //________________________________________________//
+  //Usage of AliRunTagCuts & AliEventTagCuts classes//
+  //________________________________________________//
+  // create a RunTagCut object
+  AliRunTagCuts *RunCuts = new AliRunTagCuts();
+  RunCuts->SetRunId(340);
+  // create an EventTagCut object
+  AliEventTagCuts *EvCuts = new AliEventTagCuts();
+  EvCuts->SetMultiplicityRange(11,12);
+  EvCuts->SetMaxPt(1.0);
+  TagAna->CreateXMLCollection("global2",RunCuts,EvCuts);
+
+  timer.Stop();
+  timer.Print();
+
+  return kTRUE;
+}