Java Reflection Annotation getAnnotation(final Object object, final Class annotationClass)

License

Declaration

public static <A extends Annotation> A getAnnotation(final Object object, final Class<A> annotationClass) 

Method Source Code

//package com.java2s;
/*//from  w ww  . ja va2 s  .c o  m
 *
 *  * Copyright (c) 2014- MHISoft LLC and/or its affiliates. All rights reserved.
 *  * Licensed to MHISoft LLC under one or more contributor
 *  * license agreements. See the NOTICE file distributed with
 *  * this work for additional information regarding copyright
 *  * ownership. MHISoft LLC licenses this file to you 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.
 *  
 *
 */

import java.lang.annotation.Annotation;

public class Main {
    /**
     * Get the first annotation of the declared type from this object.
     */

    public static <A extends Annotation> A getAnnotation(final Object object, final Class<A> annotationClass) {
        if (object == null)
            throw new IllegalArgumentException("object cannot be null in getAnnotation()");
        if (annotationClass == null)
            throw new IllegalArgumentException("annotationClass cannot be null in getAnnotation()");
        final Class<? extends Object> clazz = object.getClass();
        A result = null;
        for (Class<?> c = clazz; c != null; c = c.getSuperclass()) {
            result = c.getAnnotation(annotationClass);
            if (result != null)
                break;
        }
        return result;
    }
}

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