RFieldProvider.hxx

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/*************************************************************************
 * Copyright (C) 1995-2021, Rene Brun and Fons Rademakers.               *
 * All rights reserved.                                                  *
 *                                                                       *
 * For the licensing terms see $ROOTSYS/LICENSE.                         *
 * For the list of contributors see $ROOTSYS/README/CREDITS.             *
 *************************************************************************/
 
#ifndef ROOT_Browsable_RFieldProvider
#define ROOT_Browsable_RFieldProvider
 
#include "TH1.h"
#include "TMath.h"
#include <map>
#include <memory>
#include <string>
#include <utility>
 
#include <ROOT/Browsable/RProvider.hxx>
 
#include <ROOT/RFieldVisitor.hxx>
#include <ROOT/RPageStorage.hxx>
#include <ROOT/RNTupleDrawVisitor.hxx>
#include <ROOT/RNTupleView.hxx>
 
#include "RFieldHolder.hxx"
 
using namespace ROOT::Browsable;
 
using namespace std::string_literals;
 
// ==============================================================================================
 
/** \class RFieldProvider
\ingroup rbrowser
\brief Base class for provider of RNTuple drawing
\author Sergey Linev <S.Linev@gsi.de>
\date 2021-03-09
\warning This is part of the ROOT 7 prototype! It will change without notice. It might trigger earthquakes. Feedback is welcome!
*/
 
class RFieldProvider : public RProvider {
public:
   // virtual ~RFieldProvider() = default;
 
   TH1 *DrawField(RFieldHolder *holder)
   {
      if (!holder) return nullptr;
 
      auto ntplReader = holder->GetNtplReader();
 
      const auto qualifiedFieldName = ntplReader->GetDescriptor().GetQualifiedFieldName(holder->GetId());
      auto view = ntplReader->GetView<void>(qualifiedFieldName);
 
      ROOT::Internal::RNTupleDrawVisitor drawVisitor(ntplReader, holder->GetDisplayName());
      view.GetField().AcceptVisitor(drawVisitor);
      return drawVisitor.MoveHist();
   }
};
 
#endif