private static IEnumerable <EAttributeType> EvaluateAttributeTypes(PropertyInfo pi)
{
if (pi == null)
{
throw new ArgumentNullException("pi");
}
var t = ArffUtils.GetNonNullableType(pi.PropertyType);
if (t.IsEnum || InternalHelpers.IsAtt <NominalAttribute>(pi))
{
return(new [] { EAttributeType.Nominal });
}
if (t == typeof(string))
{
return(new [] { EAttributeType.String });
}
if (t == typeof(DateTime))
{
return(new [] { EAttributeType.Date });
}
if (t == typeof(bool))
{
return(new [] { EAttributeType.Binary });
}
if (typeof(IEnumerable).IsAssignableFrom(t) &&
InternalHelpers.IsAtt <FlattenAttribute>(pi))
{
// TODO: Only numerics supported at the moment. Should recurse into something
// similar to this function to get the actual type of the attribute.
return(Enumerable.Range(0, InternalHelpers.ToAtt <FlattenAttribute>(pi).IntoHowMany).
Select(i => EAttributeType.Numeric).
ToArray());
}
var tc = Type.GetTypeCode(t);
if (tc >= TypeCode.SByte && tc <= TypeCode.Decimal)
{
return(new [] { EAttributeType.Numeric });
}
throw new NotSupportedException(t.Name + " is not a supported attribute atttype.");
}
private string[] GetAttributePossibleValues(PropertyInfo prop)
{
var type = ArffUtils.GetNonNullableType(prop.PropertyType);
var att = InternalHelpers.ToAtt <NominalAttribute>(prop);
if (att != null && !String.IsNullOrWhiteSpace(att.CommaSeparatedValues))
{
return(att.CommaSeparatedValues.Split(','));
}
if (type.IsEnum)
{
return(Enum.GetNames(type));
}
var attvals = data.Select(row => InternalHelpers.ToStringSafe(Helpers.GetValue(row, prop.Name))).ToArray();
return(att is GroupedNominalAttribute?
GetGroupedAttributePossibleValues(prop, att, attvals) :
attvals.Distinct().ToArray());
}
public void GetNonNullableTypeTest()
{
Assert.AreEqual(typeof(int), ArffUtils.GetNonNullableType(typeof(int?)));
Assert.AreEqual(typeof(DateTime), ArffUtils.GetNonNullableType(typeof(DateTime?)));
Assert.AreEqual(typeof(bool), ArffUtils.GetNonNullableType(typeof(bool?)));
}