code: private String contextName(Annotation annotation) {
          if (annotation.annotationType().isAssignableFrom(FromContext.class)) {
              return ((FromContext) annotation).value();
          } else {
              return null;
          }
      }
docs: Returns the value of the annotation {@link FromContext}.
  
  @param annotation the Annotation
  @return The annotated value or <code>null</code> if no annotation is
  found