Checks the given class and all super classes for a certain class annotation and returns the first one that matches. - Android java.lang.reflect

Android examples for java.lang.reflect:Annotation

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Description

Checks the given class and all super classes for a certain class annotation and returns the first one that matches.

Demo Code

/*// ww w .java  2 s .c  o m

This file is part of Roboject

Copyright (c) 2010-2011 akquinet A.G.

Contact:  http://www.akquinet.de/en

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;

public class Main {
    /**
     * Checks the given class and all super classes for a certain class
     * annotation and returns the first one that matches. If no such annotation
     * is found, returns null.
     *
     * @param clazz           the class to check for the annotation
     * @param annotationClass the annotation type to look for
     * @return the annotation, if found, null otherwise
     */
    public static <T extends Annotation> T getAnnotation(Class<?> clazz,
            Class<T> annotationClass) {
        if (isTopMostClass(clazz)) {
            return null;
        }

        T annotation = clazz.getAnnotation(annotationClass);
        if (annotation != null) {
            return annotation;
        }
        return getAnnotation(clazz.getSuperclass(), annotationClass);
    }

    private static boolean isTopMostClass(Class<?> clazz) {
        return clazz == null || clazz.getName().startsWith("android.")
                || clazz == Object.class;
    }
}

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