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                        }
033                        catch (IllegalArgumentException ex) {
034                            throw new IllegalStateException("Failure to invoke " + method + " on "
035                                    + bean.getClass() + ": args=[]", ex);
036                        }
037                        catch (IllegalAccessException ex) {
038                            throw new UnsupportedOperationException(ex.toString());
039                        }
040                        catch (InvocationTargetException ex) {
041                            throw new UnsupportedOperationException("PostConstruct method on bean threw exception",
042                                    ex.getTargetException());
043                        }
044                    }
045                }
046            });
047        }
048    
049        public static void setField(Field f, Object instance, Object value) {
050            try {
051                boolean oldAccessible = f.isAccessible();
052                boolean shouldSetAccessible = !Modifier.isPublic(f.getModifiers()) && !oldAccessible;
053                if (shouldSetAccessible) {
054                    f.setAccessible(true);
055                }
056                f.set(instance, value);
057                if (shouldSetAccessible) {
058                    f.setAccessible(oldAccessible);
059                }
060            }
061            catch (IllegalArgumentException ex) {
062                throw new UnsupportedOperationException("Cannot inject value of class '"
063                        + value.getClass() + "' into " + f);
064            }
065            catch (IllegalAccessException ex) {
066                ReflectionUtils.handleReflectionException(ex);
067            }
068        }
069    }