HistogramFiller2D.h

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/*
  Copyright (C) 2002-2026 CERN for the benefit of the ATLAS collaboration
*/
 
#ifndef AthenaMonitoringKernel_HistogramFiller_HistogramFiller2D_h
#define AthenaMonitoringKernel_HistogramFiller_HistogramFiller2D_h
 
#include "TH2.h"
 
#include "HistogramFiller.h"
#include "HistogramFillerUtils.h"
#include "GaudiKernel/MsgStream.h"
 
namespace Monitored {

  template<typename H>
  class HistogramFiller2DGeneric : public HistogramFiller {
  public:
    HistogramFiller2DGeneric(const HistogramDef& definition, std::shared_ptr<IHistogramProvider> provider)
      : HistogramFiller(definition, std::move(provider)) {}
 
    virtual unsigned fill( const HistogramFiller::VariablesPack& vars) const override {
      if (vars.size()!=2 or vars[0] == nullptr or vars[1] == nullptr ) [[unlikely]] return 0;
 
      const size_t size0 = vars[0]->size();
      const size_t size1 = vars[1]->size();
 
      if (size0 == 0 || size1 == 0) [[unlikely]] {
        // nothing to do
        return 0;
      }
 
      if (size0 > 1 && size1 > 1 && size0 != size1) [[unlikely]] {
        MsgStream log(Athena::getMessageSvc(), "HistogramFiller2D");
        log << MSG::ERROR << "Mismatch of provided vector sizes "
            << size0 << "," << size1 << " for " << m_histDef->alias << endmsg;
        return 0;
      }
 
      if (vars.cut) {
        const size_t maskSize = vars.cut->size();
        // Abort if no cut entries or first (and only) entry is false
        if (maskSize == 0 || (maskSize == 1 && !vars.cut->get(0))) { return 0; }
        if (size0 > 1 && size1 > 1 &&
            maskSize > 1 && size0 != maskSize) [[unlikely]] {
          MsgStream log(Athena::getMessageSvc(), "HistogramFiller2D");
          log << MSG::ERROR << "CutMask does not match the size of plotted variable: "
              << maskSize << " " << size0 << endmsg;
          return 0;
        }
      }
 
      // Accessor for cut mask in case one is defined
      auto cutMaskAccessor = [&](size_t i) { return static_cast<bool>(vars.cut->get(i)); };
 
      if (vars.weight) {
        auto weightAccessor = [&](size_t i){ return vars.weight->get(i); };
        if (size0 > 1 && size1 > 1 &&
            vars.weight->size() > 1 && size0 != vars.weight->size()) [[unlikely]]  {
          MsgStream log(Athena::getMessageSvc(), "HistogramFiller2D");
          log << MSG::ERROR << "Weight does not match the size of plotted variable: "
              << vars.weight->size() << " " << size0 << endmsg;
          return 0;
        }
        // Need to fill here while weightVector is still in scope
        if (not vars.cut) return HistogramFiller::fill<H>(weightAccessor, detail::noCut, *vars[0], *vars[1]);
        else                  return HistogramFiller::fill<H>(weightAccessor, cutMaskAccessor, *vars[0], *vars[1]);
      }
 
      if (not vars.cut) return HistogramFiller::fill<H>(detail::noWeight, detail::noCut, *vars[0], *vars[1]);
      else                  return HistogramFiller::fill<H>(detail::noWeight, cutMaskAccessor, *vars[0], *vars[1]);
    }
  };
 
  typedef HistogramFiller2DGeneric<TH2> HistogramFiller2D;
}
 
#endif /* AthenaMonitoringKernel_HistogramFiller_HistogramFiller2D_h */