Merger.h

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/*
  Copyright (C) 2002-2026 CERN for the benefit of the ATLAS collaboration
*/
 
#ifndef HDF5Utils_Merger_H
#define HDF5Utils_Merger_H
 
#include "H5Cpp.h"
namespace H5Utils::hist { class HistogramMerger; }
 
#include <memory>

 
namespace H5Utils {
  class Merger {
    public:
      Merger(
          hsize_t mergeAxis = 0,
          int chunkSize = -1,
          bool requireSameFormat = true,
          std::size_t bufferSize = -1,
          bool bufferInRows = false);
 
      ~Merger();

      void merge(H5::Group& target, const H5::Group& source);

      void merge(H5::DataSet& target, const H5::DataSet& source);

      void merge(auto& target, const auto& source)
      {
        H5::Group targetGroup = convert(target);
        H5::Group sourceGroup = convert(source);
        merge(targetGroup, sourceGroup);
      }

      void flush(H5::Group& dst);
 
    private:
      static H5::Group convert(const H5::Group& group);
      static H5::Group convert(const H5::H5File& file);
 
    protected:
      hsize_t m_mergeAxis;
      int m_chunkSize;
      bool m_requireSameFormat;
      std::size_t m_bufferSize;
      bool m_measureBufferInRows;
      std::unique_ptr<H5Utils::hist::HistogramMerger> m_histMerger;
  }; //> end class Merger
} //> end namespace H5Utils
 
#endif //> !HDF5Utils_Merger_H