AnnotationUtils.java 文件源码

/**
 * Find the annotations of given <code>annotationType</code> on given element and stores them in given
 * <code>accumulator</code>.
 * @param accumulator Accumulator
 * @param element Annotated element
 * @param annotationType Annotation type to lookup
 * @param repeatableContainerType Optional repeteable annotation type
 */
private static <A extends Annotation> void findAnnotations(List<A> accumulator, AnnotatedElement element,
        Class<A> annotationType, Class<? extends Annotation> repeatableContainerType) {

    // direct lookup
    A[] as = element.getAnnotationsByType(annotationType);
    if (as.length > 0) {
        for (A a : as) {
            accumulator.add(a);
        }
    }

    // check meta-annotations
    Annotation[] all = element.getAnnotations();
    if (all.length > 0) {
        for (Annotation annotation : all) {
            if (!isInJavaLangAnnotationPackage(annotation) && !annotation.annotationType().equals(annotationType)
                    && (repeatableContainerType == null
                            || !annotation.annotationType().equals(repeatableContainerType))) {
                findAnnotations(accumulator, annotation.annotationType(), annotationType, repeatableContainerType);
            }
        }
    }

}