Java Reflection Annotation Find findAnnotation(Class clazz, Class annotationClass, Set> set)

Description

find Annotation

License

Apache License

Declaration

private static Annotation findAnnotation(Class<?> clazz, Class<? extends Annotation> annotationClass,
            Set<Class<?>> set) 

Method Source Code

//package com.java2s;
//License from project: Apache License 

import java.lang.annotation.Annotation;

import java.util.Arrays;

import java.util.Set;

public class Main {
    private static Annotation findAnnotation(Class<?> clazz, Class<? extends Annotation> annotationClass,
            Set<Class<?>> set) {
        if (clazz == null || set.contains(clazz) || clazz.equals(Object.class)) {
            return null;
        }//  www. ja v a  2  s  .c  om

        set.add(clazz);

        Annotation result = findAnnotation(clazz.getSuperclass(), annotationClass, set);

        if (result != null) {
            return result;
        }

        Annotation findResult = Arrays.stream(clazz.getInterfaces())
                .map((Class<?> interf) -> findAnnotation(interf, annotationClass, set))
                .filter((Annotation annotation) -> annotation != null).findFirst().orElse(null);

        if (findResult != null) {
            return findResult;
        }

        Annotation interfaceAnnotation = Arrays.stream(clazz.getDeclaredAnnotations())
                .filter((Annotation annotation) -> annotation.annotationType().equals(annotationClass)).findFirst()
                .orElse(null);

        if (interfaceAnnotation != null) {
            return interfaceAnnotation;
        }

        return Arrays.stream(clazz.getDeclaredAnnotations())
                .map((Annotation annotation) -> findAnnotation(annotation.annotationType(), annotationClass, set))
                .filter((Annotation annotation) -> annotation != null).findFirst().orElse(null);
    }
}

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