/*
* $Id$
*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF 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.
*/
package org.apache.struts2.convention.annotation;
import java.lang.annotation.Annotation;
/**
* <p>
* This class provides helper methods for dealing with annotations.
* </p>
*/
public class AnnotationTools {
/**
* Returns the annotation on the given class or the package of the class. This searchs up the
* class hierarchy and the package hierarchy for the closest match.
*
* @param klass The class to search for the annotation.
* @param annotationClass The Class of the annotation.
* @return The annotation or null.
*/
public static <T extends Annotation> T findAnnotation(Class<?> klass, Class<T> annotationClass) {
T ann = klass.getAnnotation(annotationClass);
while (ann == null && klass != null) {
ann = klass.getAnnotation(annotationClass);
if (ann == null)
ann = klass.getPackage().getAnnotation(annotationClass);
if (ann == null) {
klass = klass.getSuperclass();
if (klass != null ) {
ann = klass.getAnnotation(annotationClass);
}
}
}
return ann;
}
}