docs: public static Optional<AnnotationMirror> getAnnotationMirror(Element element,
        Class<? extends Annotation> annotationClass) {
      String annotationClassName = annotationClass.getCanonicalName();
      for (AnnotationMirror annotationMirror : element.getAnnotationMirrors()) {
        TypeElement annotationTypeElement = asType(annotationMirror.getAnnotationType().asElement());
        if (annotationTypeElement.getQualifiedName().contentEquals(annotationClassName)) {
          return Optional.of(annotationMirror);
        }
      }
      return Optional.absent();
    }