001 /**
002 * Licensed to the Apache Software Foundation (ASF) under one or more
003 * contributor license agreements. See the NOTICE file distributed with
004 * this work for additional information regarding copyright ownership.
005 * The ASF licenses this file to You under the Apache License, Version 2.0
006 * (the "License"); you may not use this file except in compliance with
007 * the License. You may obtain a copy of the License at
008 *
009 * http://www.apache.org/licenses/LICENSE-2.0
010 *
011 * Unless required by applicable law or agreed to in writing, software
012 * distributed under the License is distributed on an "AS IS" BASIS,
013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014 * See the License for the specific language governing permissions and
015 * limitations under the License.
016 */
017 package org.apache.camel.spring.util;
018
019 import java.lang.annotation.Annotation;
020 import java.lang.reflect.Field;
021 import java.lang.reflect.InvocationTargetException;
022 import java.lang.reflect.Method;
023 import java.lang.reflect.Modifier;
024
025 /**
026 * Reflection utilities, extending Spring ReflectionUtils.
027 */
028 public class ReflectionUtils extends org.springframework.util.ReflectionUtils {
029
030 public static <T extends Annotation> void callLifecycleMethod(final Object bean, final Class<T> annotation) {
031 ReflectionUtils.doWithMethods(bean.getClass(), new ReflectionUtils.MethodCallback() {
032 public void doWith(Method method) throws IllegalArgumentException, IllegalAccessException {
033 if (method.getAnnotation(annotation) != null) {
034 try {
035 method.invoke(bean, (Object[])null);
036 } catch (IllegalArgumentException ex) {
037 throw new IllegalStateException("Failure to invoke " + method + " on " + bean.getClass() + ": args=[]", ex);
038 } catch (IllegalAccessException ex) {
039 throw new UnsupportedOperationException(ex.toString());
040 } catch (InvocationTargetException ex) {
041 throw new UnsupportedOperationException("PostConstruct method on bean threw exception", ex.getTargetException());
042 }
043 }
044 }
045 });
046 }
047
048 public static void setField(Field f, Object instance, Object value) {
049 try {
050 boolean oldAccessible = f.isAccessible();
051 boolean shouldSetAccessible = !Modifier.isPublic(f.getModifiers()) && !oldAccessible;
052 if (shouldSetAccessible) {
053 f.setAccessible(true);
054 }
055 f.set(instance, value);
056 if (shouldSetAccessible) {
057 f.setAccessible(oldAccessible);
058 }
059 } catch (IllegalArgumentException ex) {
060 throw new UnsupportedOperationException("Cannot inject value of class: " + value.getClass() + " into: " + f);
061 } catch (IllegalAccessException ex) {
062 ReflectionUtils.handleReflectionException(ex);
063 }
064 }
065
066 }