code: public static boolean hasAnnotation(final ClassNode classNode, final Class<? extends Annotation> annotationClass) {
          return !classNode.getAnnotations(new ClassNode(annotationClass)).isEmpty();
      }
docs: Returns true if classNode is marked with annotationClass
  @param classNode A ClassNode to inspect
  @param annotationClass an annotation to look for
  @return true if classNode is marked with annotationClass, otherwise false