Java Reflection Annotation getAnnotation(Class ac, AnnotatedElement m, Annotation... directAnnotations)

License

Declaration

public static <A extends Annotation> A getAnnotation(Class<A> ac, AnnotatedElement m,
            Annotation... directAnnotations) 

Method Source Code

//package com.java2s;
import java.lang.annotation.Annotation;
import java.lang.reflect.AnnotatedElement;
import java.lang.reflect.Member;

public class Main {
    public static <A extends Annotation> A getAnnotation(Class<A> ac, AnnotatedElement m,
            Annotation... directAnnotations) {
        return getAnnotation(ac, false, m, directAnnotations);
    }//  w w w  .  j  ava 2 s . c  o  m

    private static <A extends Annotation> A getAnnotation(Class<A> ac, boolean inherit, AnnotatedElement m,
            Annotation... directAnnotations) {
        if (directAnnotations != null) {
            for (Annotation ann : directAnnotations) {
                if (ac.isInstance(ann)) {
                    return ac.cast(ann);
                }
            }
        }

        if (m == null) {
            return null;
        }
        A a = m.getAnnotation(ac);
        if (a != null) {
            return a;
        }

        if (inherit) {
            if (m instanceof Member) {
                return getAnnotation(ac, inherit, ((Member) m).getDeclaringClass());
            }

            if (m instanceof Class<?>) {
                Class<?> c = (Class<?>) m, dc = c.getDeclaringClass();
                Class p = c.getSuperclass();
                while (p != null) {
                    a = getAnnotation(ac, true, p);
                    if (a != null) {
                        return a;
                    }
                    p = p.getSuperclass();
                }

                if (dc != null) {
                    return getAnnotation(ac, inherit, dc);
                }
            }
        }
        return null;
    }
}

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