/*
* @(#)$Id$
*
* Copyright 2006-2008 Makoto YUI
*
* 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.
*
* Contributors:
* Makoto YUI - initial implementation
*/
package xbird.util.annotation;
import java.lang.annotation.Annotation;
import java.lang.reflect.Field;
import javax.annotation.Nonnull;
import javax.annotation.Nullable;
/**
*
* <DIV lang="en"></DIV>
* <DIV lang="ja"></DIV>
*
* @author Makoto YUI (yuin405+xbird@gmail.com)
*/
public final class AnnotationUtils {
private AnnotationUtils() {}
public static <T extends Annotation> T getAnnotation(Class<?> cls, Class<T> annCls) {
for(Class<?> c = cls; !c.equals(Object.class); c = c.getSuperclass()) {
T ann = c.getAnnotation(annCls);
if(ann != null) {
return ann;
}
}
return null;
}
public static void injectFieldResource(@Nullable Object target, @Nonnull Class<? extends Annotation> annCls, @Nonnull ResourceInjector injector)
throws IllegalArgumentException, IllegalAccessException {
if(target == null) {
return;
}
for(Class<?> cls = target.getClass(); cls.equals(Object.class) == false; cls = cls.getSuperclass()) {
for(Field f : cls.getDeclaredFields()) {
if(f.getName().startsWith("this$")) {// for anonymous class
f.setAccessible(true);
injectFieldResource(f.get(target), annCls, injector); // recursion
} else {
Annotation ann = f.getAnnotation(annCls);
if(ann != null) {
injector.inject(f, target, ann);
}
}
}
}
}
}