code: @Nullable
  	public String getValueFrom(Annotation annotation) {
  
  		Assert.notNull(annotation, "Annotation must not be null!");
  		return (String) (attributeName == null ? AnnotationUtils.getValue(annotation) : AnnotationUtils.getValue(
  				annotation, attributeName));
  	}
docs: Returns the {@link Annotation} attribute's value from the given {@link Annotation}.
  
  @param annotation must not be {@literal null}.
  @return