Java Reflection Annotation getAnnotation(Object obj, Class acl)

License

Declaration

public static <A extends Annotation> A getAnnotation(Object obj, Class<A> acl) 

Method Source Code

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

public class Main {

    public static <A extends Annotation> A getAnnotation(Object obj, Class<A> acl) {
        return getAnnotation(obj.getClass(), acl);
    }//  w w w. j a va 2  s. c o  m

    @SuppressWarnings("unchecked")
    public static <A extends Annotation> A getAnnotation(Class cl, Class<A> acl) {
        A ret = (A) cl.getAnnotation(acl);
        while (ret == null && cl.getSuperclass() != null) {
            cl = cl.getSuperclass();
            ret = (A) cl.getAnnotation(acl);
        }
        return ret;
    }

    @SuppressWarnings("unchecked")
    public static <A extends Annotation> A getAnnotation(Class cl, Method m, Class<A> acl) {
        A ret = (A) m.getAnnotation(acl);
        while (ret == null && cl.getSuperclass() != null) {
            cl = cl.getSuperclass();
            try {
                m = cl.getMethod(m.getName(), m.getParameterTypes());
                ret = m.getAnnotation(acl);
            } catch (NoSuchMethodException e) {
                break;
            }
        }
        return ret;
    }
}

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