AnnotationFinder.java 文件源码

/**
 * The default implementation performs a simple search for a declared annotation matching the search type.
 * Spring provides a more sophisticated annotation search utility that matches on meta-annotations as well.
 *
 * @param annotatedElement The element to search.
 * @param annotationType The annotation type class.
 * @param <A> Annotation type to search for.
 * @return
 */
@SuppressWarnings("unchecked")
default <A extends Annotation> A findAnnotation(AnnotatedElement annotatedElement, Class<A> annotationType) {
    Annotation[] anns = annotatedElement.getDeclaredAnnotations();
    for (Annotation ann : anns) {
        if (ann.annotationType() == annotationType) {
            return (A) ann;
        }
    }
    return null;
}