public static string GetSymbol(IIfcUnit unit)
{
if (unit is IIfcDerivedUnit du)
{
return(GetSymbol(du));
}
else if (unit is IIfcContextDependentUnit cdu)
{
return(cdu.Name);
}
else if (unit is IIfcConversionBasedUnit cbu)
{
return(cbu.Name);
}
else if (unit is IIfcSIUnit si)
{
return(GetSymbol(si));
}
else if (unit is IIfcMonetaryUnit mu)
{
return(mu.Currency);
}
throw new ArgumentOutOfRangeException(nameof(unit), "Unexpected unit type " + unit.GetType().Name);
}
