/// <summary>
/// Scrutinizes the variable attribute and ensures it has been annotated correctly.
/// </summary>
/// <param name="attr">The attribute to scrutinize.</param>
private static void _guardBadAttribute(AlgorithmPropertyAttribute attr)
{
if (attr.CompressorType != null)
{
CompressorAttribute cattr = attr.CompressorType.GetCustomAttribute(
typeof(CompressorAttribute)) as CompressorAttribute;
if (cattr == null)
{
throw new ArgumentException("Compressor type provided not annotated.");
}
if (attr.CompressorType.GetInterfaces().Contains(typeof(ICompressor)) == false)
{
throw new ArgumentException("Compressor type does not implement ICompressor.");
}
}
if (attr.PublicType != null)
{
if (attr.PublicTypeConverter == null)
{
throw new ArgumentException("Faux type converter not provided.");
}
if (attr.PublicTypeConverter.GetInterfaces().Contains(typeof(IValueConverter)) == false)
{
throw new ArgumentException("PublicTypeConverter does not implement IValueConverter.");
}
}
}
/// <summary>
/// Constructs a set of Property objects representing the annotated properties
/// in the type
/// </summary>
/// <param name="processType">The type to gather the properties from</param>
/// <returns>A set of Property objects representing the annotated properties</returns>
private static IEnumerable <Property> _gatherAlgorithmProperties(Type processType)
{
List <Property> properties = new List <Property>();
foreach (PropertyInfo property in processType.GetProperties())
{
var varAttrs = property.GetCustomAttributes().OfType <AlgorithmPropertyAttribute>();
if (varAttrs.Any())
{
AlgorithmPropertyAttribute attr = varAttrs.First();
Property p = _createProperty(property, attr);
properties.Add(p);
}
}
return(properties);
}
/// <summary>
/// Constructs the Property definition using the CLR information and
/// the metadata provided in the attribute
/// </summary>
/// <param name="property">The reflected information about the property
/// within the class</param>
/// <param name="attr">The additional information provided by the
/// plugin</param>
/// <returns>A Property definition</returns>
private static Property _createProperty(PropertyInfo property, AlgorithmPropertyAttribute attr)
{
_guardBadAttribute(attr);
PropertyBuilder b = new PropertyBuilder();
b.Name = attr.VariableIdentifier;
b.PropertyType = property.PropertyType;
b.PublicType = attr.PublicType;
b.DefaultValue = attr.DefaultValue;
if (attr.CompressorType != null)
{
b.Compressor = Activator.CreateInstance(attr.CompressorType) as ICompressor;
}
if (attr.PublicTypeConverter != null)
{
b.Converter = Activator.CreateInstance(attr.PublicTypeConverter) as IValueConverter;
}
return(b.Build());
}
