PndSimpleNtuple.h

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// -------------------------------------------------------------------------------
// ---------                    PndSimpleNtuple                           --------
// -------------------------------------------------------------------------------
//
// Represents a simplified N-Tuple based on a ROOT TTree.
//
// Branches of type double, float or int are created on the fly with the command
//
//   'Column(TString name, double/float/int value);'
//
// At the end of each event (i.e. when the N-Tuple should be filled) either
//
//   'DumpData()'    or
//   'AcceptData()'
//
// has to be called. The method 'AcceptData()' is a conditional fill in case a
// certain precut is fulfilled, which can be set either in the constructor with
//
//   PndSimpleNtuple(TString name, TString title, TString <precut>)
//
// or with the method
//
//   SetPrecut(TString precut)
//
// which can even be changed inbetween. The precut is a TFormula directly based
// on the branches of the TTree.
//
// -------------------------------------------------------------------------------

#ifndef PndSimpleNtuple_H
#define PndSimpleNtuple_H 1

#include "TString.h"
#include "TTree.h"
#include "TTreeFormula.h"
#include <iostream>
#include <map>
#include <vector>

class PndSimpleNtuple {
 public:
  PndSimpleNtuple(TString name, TString title, TString precut = "");

  ~PndSimpleNtuple()
  {
    if (fFml != 0)
      delete fFml;
  }

  void Column(const TString &name, double value); // sets double value of a variable 'name'
  void Column(const TString &name, float value);  // sets float  value of a variable 'name'
  void Column(const TString &name, int value);    // sets integer value of a variable 'name'
  void Column(const TString &name, bool value);   // sets bool value of a variable 'name'

  void ColumnD(const TString &name, double value) { Column(name, value); } // sets double value of a variable 'name'
  void ColumnF(const TString &name, float value) { Column(name, value); }  // sets float  value of a variable 'name'
  void ColumnI(const TString &name, int value) { Column(name, value); }    // sets integer value of a variable 'name'
  void ColumnB(const TString &name, bool value) { Column(name, value); }   // sets bool value of a variable 'name'

  // void Column(TString name, Double_t *vpointer, TString idxvar);  // sets double value array of a variable 'name', index variable 'idxvar'
  // void Column(TString name, Float_t *vpointer,  TString idxvar);  // sets float value array of a variable 'name', index variable 'idxvar'
  // void Column(TString name, Int_t *vpointer,    TString idxvar);  // sets integer value array of a variable 'name', index variable 'idxvar'
  // void Column(TString name, Bool_t *vpointer,   TString idxvar);  // sets bool value of array a variable 'name', index variable 'idxvar'

  bool DumpData()
  {
    fTree->Fill();
    fTmpTree->Reset();
    return true;
  }              // writes the current event
  bool Accept(); // check whether entry fulfills cut
  bool AcceptData()
  {
    if (Accept()) {
      DumpData();
      return true;
    }
    return false;
  } // writes current event if accepted

  TTree *GetTree() { return fTree; }
  double GetCurrentValue(TString name);
  void SetPrecut(TString precut);
  bool BranchExists(TString name) { return (fBrTypes.find(name) != fBrTypes.end()); }
  int ShowBranches();

 private:
  TTree *fTree;
  TTree *fTmpTree;

  std::map<TString, double> fDValues;
  std::map<TString, float> fFValues;
  std::map<TString, int> fIValues;
  std::map<TString, char> fBValues;

  std::map<TString, int> fBrTypes;

  TString fPrecut;    // precut in TTreeFormula notation
  TTreeFormula *fFml; // the actual formula
};

#endif