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    public class ReflectionUtils extends org.springframework.util.ReflectionUtils {
026        public static <T extends Annotation> void callLifecycleMethod(final Object bean, final Class<T> annotation) {
027            ReflectionUtils.doWithMethods(bean.getClass(), new ReflectionUtils.MethodCallback() {
028                public void doWith(Method method) throws IllegalArgumentException, IllegalAccessException {
029                    if (method.getAnnotation(annotation) != null) {
030                        try {
031                            method.invoke(bean, (Object[])null);
032                        } catch (IllegalArgumentException ex) {
033                            throw new IllegalStateException("Failure to invoke " + method + " on " + bean.getClass() + ": args=[]", ex);
034                        } catch (IllegalAccessException ex) {
035                            throw new UnsupportedOperationException(ex.toString());
036                        } catch (InvocationTargetException ex) {
037                            throw new UnsupportedOperationException("PostConstruct method on bean threw exception", ex.getTargetException());
038                        }
039                    }
040                }
041            });
042        }
043    
044        public static void setField(Field f, Object instance, Object value) {
045            try {
046                boolean oldAccessible = f.isAccessible();
047                boolean shouldSetAccessible = !Modifier.isPublic(f.getModifiers()) && !oldAccessible;
048                if (shouldSetAccessible) {
049                    f.setAccessible(true);
050                }
051                f.set(instance, value);
052                if (shouldSetAccessible) {
053                    f.setAccessible(oldAccessible);
054                }
055            } catch (IllegalArgumentException ex) {
056                throw new UnsupportedOperationException("Cannot inject value of class '" + value.getClass() + "' into " + f);
057            } catch (IllegalAccessException ex) {
058                ReflectionUtils.handleReflectionException(ex);
059            }
060        }
061    }