Java Reflection Annotation getAnnotation(Class type, Class ann)

License

Declaration

public static <A extends Annotation> A getAnnotation(Class<?> type, Class<A> ann) 

Method Source Code

//package com.java2s;
/*/*from w  w  w  .  j  a  va 2  s  .  c  om*/
 * Copyright (c) 1998-2015 Caucho Technology -- all rights reserved
 *
 * This file is part of Baratine(TM)
 *
 * Each copy or derived work must preserve the copyright notice and this
 * notice unmodified.
 *
 * Baratine is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * Baratine 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, or any warranty
 * of NON-INFRINGEMENT.  See the GNU General Public License for more
 * details.
 *
 * You should have received a copy of the GNU General Public License
 * along with Baratine; if not, write to the
 *
 *   Free Software Foundation, Inc.
 *   59 Temple Place, Suite 330
 *   Boston, MA 02111-1307  USA
 *
 * @author Alex Rojkov
 */

import java.lang.annotation.Annotation;

public class Main {
    public static <A extends Annotation> A getAnnotation(Class<?> type, Class<A> ann) {
        A a;

        do {
            a = type.getAnnotation(ann);

            Class<?>[] faces = type.getInterfaces();
            for (int i = 0; a == null && i < faces.length; i++) {
                Class<?> face = faces[i];
                a = face.getAnnotation(ann);
            }
        } while (a == null && !Object.class.equals(type = type.getSuperclass()));

        return a;
    }
}

Related