find Class Annotation Declared With - Java java.lang.annotation

Java examples for java.lang.annotation:Class Annotation

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Description

find Class Annotation Declared With

Demo Code

/*/*from w  w w . j a  v a 2s  .  c om*/
 * Copyright 2011 Alibaba Group Holding Limited.
 * All rights reserved.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *    http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *
 */
//package com.java2s;
import java.lang.annotation.Annotation;

import java.util.Arrays;

public class Main {
    public static void main(String[] argv) throws Exception {
        Class clazz = String.class;
        Class annotationType = String.class;
        System.out.println(findClassAnnotationDeclaredWith(clazz,
                annotationType));
    }

    public static Class<?> findClassAnnotationDeclaredWith(Class<?> clazz,
            Class<? extends Annotation> annotationType) {
        if (clazz == null || clazz.equals(Object.class)) {
            return null;
        }
        return (isAnnotationDeclaredWith(clazz, annotationType)) ? clazz
                : findClassAnnotationDeclaredWith(clazz.getSuperclass(),
                        annotationType);
    }

    public static boolean isAnnotationDeclaredWith(Class<?> clazz,
            Class<? extends Annotation> annotationType) {
        boolean annotationDeclared = false;
        for (Annotation annotation : Arrays.asList(clazz
                .getDeclaredAnnotations())) {
            if (annotation.annotationType().equals(annotationType)) {
                annotationDeclared = true;
                break;
            }
        }
        return annotationDeclared;
    }
}

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