ColumnarToolDataArray.h

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/*
  Copyright (C) 2002-2025 CERN for the benefit of the ATLAS collaboration
*/

 
 
#ifndef COLUMNAR_CORE_COLUMNAR_TOOL_DATA_ARRAY_H
#define COLUMNAR_CORE_COLUMNAR_TOOL_DATA_ARRAY_H
 
#include <ColumnarCore/ColumnarTool.h>
#include <ColumnarInterfaces/ColumnInfo.h>
 
namespace columnar
{
  struct ColumnDataArray final
  {
    ColumnDataArray () noexcept = default;

    ColumnDataArray (ColumnDataArray&& other) noexcept;
 
    ColumnDataArray operator= (ColumnDataArray&& other) noexcept = delete;

    ~ColumnDataArray () noexcept;

    bool empty () const noexcept;

    const ColumnInfo& info () const noexcept;

    void addAccessor (const std::string& name, const ColumnInfo& val_info, ColumnAccessorDataArray* val_accessorData);

    void removeAccessor (ColumnAccessorDataArray& val_accessorData);

    void mergeData (const std::string& name, ColumnDataArray&& other);

    void setIndex (unsigned val_index) noexcept;
 
  private:

    ColumnInfo m_info;

    std::vector<ColumnAccessorDataArray*> m_accessors;
  };
 
 
 
  struct ColumnarToolDataArray final
  {
    struct StringHash {
        using is_transparent = void; // enables heterogeneous lookup
        size_t operator()(std::string_view sv) const noexcept {
            return std::hash<std::string_view>{}(sv);
        }
    };

    ColumnarTool<ColumnarModeArray>* mainTool = nullptr;

    std::vector<ColumnarTool<ColumnarModeArray>*> sharedTools;

    std::unordered_map<std::string,std::string,StringHash,std::equal_to<>> containerInternalToUserNames;
    std::unordered_map<std::string,std::vector<std::string>,StringHash,std::equal_to<>> containerUserToInternalNames;

    std::unordered_map<std::string,std::string,StringHash,std::equal_to<>> columnInternalToUserNames;
    std::unordered_map<std::string,std::vector<std::string>,StringHash,std::equal_to<>> columnUserToInternalNames;

    std::unordered_map<std::string,ColumnDataArray> columns;
 

    [[nodiscard]] std::string convertInternalToUserName (std::string_view name) const;
    [[nodiscard]] std::vector<std::string> convertUserToInternalNames (std::string_view name) const;
  };
}
 
#endif