NcVarMetaCF.h

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#ifndef INC_netcdf_NcVarMetaCF_h
#define INC_netcdf_NcVarMetaCF_h

#include "NcVar.h"

namespace netcdf {


class NcVarMetaCF
{
  public:

    enum MetaItem               // items match elements of array attNames
    {
        Meta_longName,          
        Meta_standardName,      
        Meta_units,             
        Meta_validMin,          
        Meta_validMax,          
        Meta_FillValue,         
        Meta_Encoding,          
        Meta_Unknown            // last item always
    };

    NcVarMetaCF ( netcdf::NcVar & useNcVar )
      : var (useNcVar)
      {
      }

    template< class data_type > void Set (
      MetaItem const which,
      data_type const & data)
      {
        if ( which == Meta_validMin ||
             which == Meta_validMax ||
             which == Meta_FillValue )
        {
          var.PutAtt ( std::string(attNames[which]), var.GetType(), data );
        }
      }

    void Set (
      MetaItem const which,
      std::string const & data)
      {
        if ( which != Meta_Unknown )
            var.PutAtt( std::string(attNames[which]), data );
      }

    void Set (
      MetaItem const which,
      char const * const data)
      {
        if ( which != Meta_Unknown )
            var.PutAtt( std::string(attNames[which]), std::string(data) );
      }

    template< class data_type > void Get (
      MetaItem const which,
      data_type & data)
      {
        if ( which != Meta_Unknown && Exists(which) )
        {
            netcdf::NcVarAtt const att = var.GetAtt( attNames[which] );
            att.Get(data);
        }
      }

    static char const * const GetAttName (MetaItem const which)
      { return attNames[which]; /* no checks */ }

    bool Exists (MetaItem const which) const;

  private:

    static char const * const attNames[];
    netcdf::NcVar var;

    // not used
    NcVarMetaCF (NcVarMetaCF const & rhs);
    NcVarMetaCF & operator= (NcVarMetaCF const & rhs);
};


inline bool NcVarMetaCF::Exists (MetaItem const which) const
{
    return var.HaveAttribute( GetAttName(which) );
}



} // namespace netcdf

#endif // INC_netcdf_NcVarMetaCF_h