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    }