public IExtensionMetadata GetExtensionMetadata([Required] string id)
{
IExtensionMetadata result = null;
var type = GetType();
var fields = type.GetFields(BindingFlags.Instance | BindingFlags.NonPublic)
.Where(x => x.GetCustomAttribute(typeof(ImportManyAttribute)) != null).ToArray();
if (fields.Any())
{
foreach (var field in fields)
{
var variable = field.GetValue(this) as IEnumerable <object>;
IExtensionMetadata metadata = variable?
.Select(x => (IExtensionMetadata)x.GetType().GetProperty("Metadata")?.GetValue(x))
.FirstOrDefault(x => string.CompareOrdinal(x.Id, id) == 0);
if (metadata != null)
{
result = metadata;
break;
}
}
}
return(result);
}
/// <summary>
/// Tests a given extension metadata set against the given object.
/// </summary>
/// <param name="obj"></param>
/// <param name="metadata"></param>
/// <returns></returns>
internal static bool Predicate(XObject obj, IExtensionMetadata metadata)
{
Contract.Requires <ArgumentNullException>(obj != null);
Contract.Requires <ArgumentNullException>(metadata != null);
if (!metadata.ObjectType.HasFlag(GetObjectType(obj)))
{
return(false);
}
if (obj is XElement)
{
if (!IsMatch((XElement)obj, metadata.NamespaceName, metadata.LocalName))
{
return(false);
}
}
if (obj is XAttribute)
{
if (!IsMatch((XAttribute)obj, metadata.NamespaceName, metadata.LocalName))
{
return(false);
}
}
// test against specified predicate type
var predicate = metadata.PredicateType != null?predicates.GetOrAdd(metadata.PredicateType, _ => (IExtensionPredicate)Activator.CreateInstance(_)) : null;
if (predicate != null)
{
if (!predicate.IsMatch(obj))
{
return(false);
}
}
return(true);
}
/// <summary>
/// Return the string used for the "scope".
/// </summary>
/// <param name="extensionMetadata_"></param>
/// <returns>The scope, equal to assembly name, given by Assembly.GetName().Name</returns>
public static string GetScope(this IExtensionMetadata extensionMetadata_)
{
return(extensionMetadata_.GetType().Assembly.GetName().Name);
}
public void Construct(CompositionContainer container, IExtensionMetadata metadata)
{
if (Constructed)
throw new ExtensionAlreadyContructedException(this);
Metadata = metadata;
container.SatisfyImportsOnce(this);
ResolveBaseDependencies();
Construction();
Constructed = true;
}
/// <summary>
/// Tests a given extension metadata set against the given object.
/// </summary>
/// <param name="obj"></param>
/// <param name="metadata"></param>
/// <returns></returns>
internal static bool Predicate(XObject obj, IExtensionMetadata metadata)
{
Contract.Requires<ArgumentNullException>(obj != null);
Contract.Requires<ArgumentNullException>(metadata != null);
if (!metadata.ObjectType.HasFlag(GetObjectType(obj)))
return false;
if (obj is XElement)
if (!IsMatch((XElement)obj, metadata.NamespaceName, metadata.LocalName))
return false;
if (obj is XAttribute)
if (!IsMatch((XAttribute)obj, metadata.NamespaceName, metadata.LocalName))
return false;
// test against specified predicate type
var predicate = metadata.PredicateType != null ? predicates.GetOrAdd(metadata.PredicateType, _ => (IExtensionPredicate)Activator.CreateInstance(_)) : null;
if (predicate != null)
if (!predicate.IsMatch(obj))
return false;
return true;
}
