public T GetAnnotation(MemberInfo type)
{
AnnotationEntry <T> entry = GetAnnotationEntry(type);
if (entry == null)
{
return(null);
}
return(entry.Annotation);
}
public AnnotationEntry <T> GetAnnotationEntry(MemberInfo annotatedElement)
{
readLock.Lock();
try
{
if (typeToCacheContextMap.ContainsKey(annotatedElement))
{
return(typeToCacheContextMap[annotatedElement]);
}
}
finally
{
readLock.Unlock();
}
Object[] attributes = annotatedElement.GetCustomAttributes(typeof(T), true);
T annotation = attributes != null && attributes.Length > 0 ? (T)attributes[0] : null;
MemberInfo declaringAnnotatedElement = null;
if (annotation == null)
{
if (annotatedElement is Type)
{
Type type = (Type)annotatedElement;
Type[] interfaces = type.GetInterfaces();
for (int a = interfaces.Length; a-- > 0;)
{
attributes = interfaces[a].GetCustomAttributes(typeof(T), true);
T interfaceAnnotation = attributes != null && attributes.Length > 0 ? (T)attributes[0] : null;
if (interfaceAnnotation == null)
{
continue;
}
if (annotation == null)
{
annotation = interfaceAnnotation;
declaringAnnotatedElement = interfaces[a];
continue;
}
if (!AnnotationEquals(annotation, interfaceAnnotation))
{
throw new Exception("Ambiguous annotation on type " + type.ToString() + " with " + typeof(T).FullName
+ " based on multiple implementing interfaces with DIFFERENT " + typeof(T).FullName + " values");
}
}
}
}
else
{
declaringAnnotatedElement = annotatedElement;
}
AnnotationEntry <T> entry = annotation != null ? new AnnotationEntry <T>(annotation, declaringAnnotatedElement) : null;
writeLock.Lock();
try
{
typeToCacheContextMap[annotatedElement] = entry;
}
finally
{
writeLock.Unlock();
}
return(entry);
}