get Annotation From Method Or Class - Java java.lang.annotation

Java examples for java.lang.annotation:Method Annotation

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Description

get Annotation From Method Or Class

Demo Code

/*// w ww . j  a  va2 s .c  o m
 * Copyright (C) 2013 Matija Mazi
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy of
 * this software and associated documentation files (the "Software"), to deal in
 * the Software without restriction, including without limitation the rights to
 * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
 * of the Software, and to permit persons to whom the Software is furnished to do
 * so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */
//package com.java2s;
import java.lang.annotation.Annotation;
import java.lang.reflect.Method;

public class Main {
    static <A extends Annotation> A getFromMethodOrClass(Method method,
            Class<A> annotationClass) {

        A methodAnn = method.getAnnotation(annotationClass);
        if (methodAnn != null) {
            return methodAnn;
        }
        for (Class<?> cls = method.getDeclaringClass(); cls != null; cls = cls
                .getSuperclass()) {
            if (cls.isAnnotationPresent(annotationClass)) {
                return cls.getAnnotation(annotationClass);
            }
        }
        for (Class<?> intf : method.getDeclaringClass().getInterfaces()) {
            if (intf.isAnnotationPresent(annotationClass)) {
                return intf.getAnnotation(annotationClass);
            }
        }
        return null;
    }
}

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