Java Reflection Annotation Find findAnnotationInMethodOrInItsAnnotations(Method method, Class annotationClass)

License

Parameter

Return

Declaration

public static <A extends Annotation> A findAnnotationInMethodOrInItsAnnotations(Method method,
        Class<A> annotationClass) 

Method Source Code

//package com.java2s;
/**/*from   w  ww  . ja v a 2  s  . co  m*/
 * Copyright (c) 2000-present Liferay, Inc. All rights reserved.
 *
 * This library is free software; you can redistribute it and/or modify it under
 * the terms of the GNU Lesser General Public License as published by the Free
 * Software Foundation; either version 2.1 of the License, or (at your option)
 * any later version.
 *
 * This library is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
 * FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more
 * details.
 */

import java.lang.annotation.Annotation;
import java.lang.reflect.Method;

public class Main {
    /**
     * Tries to extract an annotation of a certain class directly annotated on
     * to the method or any of its annotations.
     *
     * @param  method the method in which to look for
     * @param  annotationClass the annotation class to search
     * @return the annotation, if found; {@code null} otherwise
     * @review
     */
    public static <A extends Annotation> A findAnnotationInMethodOrInItsAnnotations(Method method,
            Class<A> annotationClass) {

        if (method.isAnnotationPresent(annotationClass)) {
            return method.getAnnotation(annotationClass);
        }

        for (Annotation annotation : method.getAnnotations()) {
            Class<? extends Annotation> annotationType = annotation.annotationType();

            if (annotationType.isAnnotationPresent(annotationClass)) {
                return annotationType.getAnnotation(annotationClass);
            }
        }

        return null;
    }
}

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