Java Reflection Annotation Find findAnnotation(Class clazz, Class annotationClass)

Here you can find the source of findAnnotation(Class clazz, Class annotationClass)

Description

find Annotation

License

Open Source License

Declaration

public static <T extends Annotation> T findAnnotation(Class<?> clazz, Class<T> annotationClass) 

Method Source Code

//package com.java2s;
/*******************************************************************************************
 *   Copyright (c) 2016, zzg.zhou(11039850@qq.com)
 * //from   w ww .  j av a  2 s  . com
 *  Monalisa 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 3 of the License, or
 *   (at your option) any later version.
    
 *   This program 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.
    
 *   You should have received a copy of the GNU Lesser General Public License
 *   along with this program.  If not, see <http://www.gnu.org/licenses/>.
 *******************************************************************************************/

import java.lang.annotation.Annotation;

public class Main {
    public static <T extends Annotation> T findAnnotation(Class<?> clazz, Class<T> annotationClass) {
        T a = null;

        Class<?> c = findClassWithAnnotation(clazz, annotationClass);
        if (c != null) {
            a = c.getAnnotation(annotationClass);
        }

        return a;
    }

    public static <T extends Annotation> Class<?> findClassWithAnnotation(Class<?> clazz,
            Class<T> annotationClass) {
        T a = null;

        while (a == null && clazz != null) {
            a = clazz.getAnnotation(annotationClass);
            if (a == null) {
                Class<?>[] interfaces = clazz.getInterfaces();
                if (interfaces != null) {
                    for (Class<?> c : interfaces) {
                        a = c.getAnnotation(annotationClass);
                        if (a != null) {
                            return c;
                        }
                    }
                }
                clazz = clazz.getSuperclass();
            } else {
                return clazz;
            }
        }
        return null;
    }
}

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