DBCell.h

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 *       - Pierre-Henri WUILLEMIN(_at_LIP6)                                 *
 *       - Christophe GONZALES(_at_AMU)                                     *
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#ifndef GUM_LEARNING_DB_CELL_H
#define GUM_LEARNING_DB_CELL_H
 
#include <cstring>
#include <stdexcept>
#include <string>
#include <utility>
 
#include <agrum/agrum.h>
 
#include <agrum/base/core/bijection.h>
 
#include <string_view>
#include <type_traits>
 
namespace gum {
 
  namespace learning {

    class DBCell {
      public:
      enum class EltType : unsigned char { REAL, INTEGER, STRING, MISSING };
 
      // ##########################################################################
      // ##########################################################################


      DBCell();

      DBCell(const float nb);

      DBCell(const int nb);

      DBCell(const std::string& str);

      DBCell(const DBCell& from);

      DBCell(DBCell&& from);

      ~DBCell();

 
 
      // ##########################################################################
      // ##########################################################################


      DBCell& operator=(const DBCell& from);

      DBCell& operator=(DBCell&& from);

      DBCell& operator=(const float x);

      DBCell& operator=(const int x);

      DBCell& operator=(const std::string& x);

      bool operator==(const DBCell& from) const;
 

 
 
      // ##########################################################################
      // ##########################################################################


      EltType type() const noexcept;


      bool convertType(const EltType newtype);


      float real() const;

      void setReal(const float x);


      void setReal(std::string_view elt);


      int integer() const;

      void setInteger(const int x);


      void setInteger(std::string_view elt);


      const std::string& string() const;

      int stringIndex() const;

      void setString(const std::string& elt);

      void setMissingState();

      bool isMissing() const;

 
 
      // ##########################################################################
      // ##########################################################################



      static const std::string& string(const int index);


      static EltType bestType(std::string_view str, const std::vector< std::string >& missingVals);


      static DBCell bestDBCell(std::string_view str, const std::vector< std::string >& missingVals);


      std::string toString(const std::vector< std::string >& missingVals) const;

      static bool isInteger(std::string_view str);

      static bool isReal(std::string_view str);

      static bool isMissing(std::string_view str, const std::vector< std::string >& missingVals);

 
 
#ifndef DOXYGEN_SHOULD_SKIP_THIS
 
      private:
      // the real type of the last element read from the database
      EltType _type_{EltType::MISSING};
 
      // the element read from the database
      union {
        int   _val_index_;     // stores string indices. Basically, it should have
        int   _val_integer_;   // been an Idx, but int are shorter than Idx.
        float _val_real_;
      };
 
      // determine the longest type of the union. This is used for fast
      // copying/moving DBCells
      using UnionType = typename std::conditional< sizeof(int) < sizeof(float), float, int >::type;
 
      // raises an appropriate exception when encountering a type error
      std::string _typeErrorMsg_(std::string_view real_type) const;
 
 
      // a bijection assigning to each string index its corresponding string
      static Bijection< std::string, int >& _strings_();
 
      // the last index used so far
      static int _string_max_index_;
 
#endif /* DOXYGEN_SHOULD_SKIP_THIS */
    };
 
  } /* namespace learning */
 
} /* namespace gum */

#ifndef GUM_NO_INLINE
#  include <agrum/base/database/DBCell_inl.h>
#endif /* GUM_NO_INLINE */
 
#endif /* GUM_LEARNING_DB_CELL_H */