Extract the set of java interfaces from the class hierarchy of the bean provided that match the annotation provided. - Java java.lang.annotation

Java examples for java.lang.annotation:Class Annotation

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Description

Extract the set of java interfaces from the class hierarchy of the bean provided that match the annotation provided.

Demo Code

/*/* w ww .j  a v a 2  s . c o m*/
 * Copyright 2012 The Kuali Foundation
 *
 * Licensed under the the Educational Community License, Version 1.0
 * (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.opensource.org/licenses/ecl1.php
 *
 * 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.HashSet;
import java.util.Set;

public class Main {
    public static void main(String[] argv) throws Exception {
        Object bean = "java2s.com";
        Class annotation = String.class;
        System.out.println(extractInterfaceContainingAnnotation(bean,
                annotation));
    }

    /**
     * Extract the set of java interfaces from the class hierarchy of the bean provided that match the annotation provided.
     * 
     * @param bean
     * @param annotation
     * @return the set of java interfaces that match the annotation.
     */
    public static Set<Class<?>> extractInterfaceContainingAnnotation(
            Object bean, Class<? extends Annotation> annotation) {

        Class<? extends Object> beanClass = bean.getClass();

        Class<?>[] interfaces = beanClass.getInterfaces();

        Set<Class<?>> matchingInterfaces = new HashSet<Class<?>>();

        for (Class<?> candidateInterface : interfaces) {

            Annotation ws = candidateInterface.getAnnotation(annotation);

            if (ws != null)
                matchingInterfaces.add(candidateInterface);
        }

        return matchingInterfaces;
    }
}

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