public static Type GetDrawable(ImportNamespaceInfo import, string localName)
{
lock (_lock)
{
if (!_loadedTypes.TryGetValue(import.AssemblyName, out var typeDict))
{
typeDict = _loadedTypes[import.AssemblyName] = Assembly
.Load(import.AssemblyName)
.GetExportedTypes()
.Where(t => t.IsClass &&
t.IsSubclassOf(typeof(Drawable)))
.ToArray();
}
var pattern = Glob.Parse(import.ImportPattern);
var matchingTypes = typeDict
.Where(t => pattern.IsMatch(t.FullName) &&
localName.Equals(t.Name))
.ToArray();
if (matchingTypes.Length == 1)
{
var matchingType = matchingTypes[0];
// Ensure type is not abstract
if (matchingType.IsAbstract)
{
throw new MarkupException($"Drawable '{matchingType}' is abstract and cannot be used.");
}
// Ensure type can be created
if (!matchingType.GetConstructors().Any(c => c.GetParameters().All(p => p.IsOptional)))
{
throw new MarkupException($"Drawable '{matchingType}' does not have a suitable constructor.");
}
return(matchingType);
}
if (matchingTypes.Length == 0)
{
throw new KeyNotFoundException($"Type '{localName}' could not be found in assembly '{import.AssemblyName}'.");
}
throw new AmbiguousMatchException(
$"Drawable '{localName}' is ambiguous between the following types: " +
string.Join(", ", matchingTypes.Select(t => t.FullName))
);
}
}
public void Load(XElement element)
{
if (string.IsNullOrEmpty(element.Name.NamespaceName))
{
throw new MarkupException($"Namespace for element '{element.Name.LocalName}' is not specified");
}
// Parse type
DrawableType = DrawableTypeStore.GetDrawable(
import: ImportNamespaceInfo.Parse(element.Name.NamespaceName),
localName: element.Name.LocalName
);
reloadProperties(element);
reloadChildren(element);
}