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.impl;
018    
019    import org.apache.camel.CamelContext;
020    import org.apache.camel.RuntimeCamelException;
021    import org.apache.camel.spi.Injector;
022    import org.apache.camel.util.ReflectionInjector;
023    
024    /**
025     * A default implementation of {@link Injector} which just uses reflection to
026     * instantiate new objects using their zero argument constructor,
027     * and then performing bean post processing using {@link DefaultCamelBeanPostProcessor}.
028     * <p/>
029     * For more complex implementations try the Spring or Guice implementations.
030     *
031     * @see ReflectionInjector
032     */
033    public class DefaultInjector implements Injector  {
034    
035        // use the reflection injector
036        private final Injector delegate = new ReflectionInjector();
037        private final DefaultCamelBeanPostProcessor postProcessor;
038    
039        public DefaultInjector(CamelContext context) {
040            postProcessor = new DefaultCamelBeanPostProcessor(context);
041        }
042    
043        @Override
044        public <T> T newInstance(Class<T> type) {
045            T answer = delegate.newInstance(type);
046            if (answer != null) {
047                try {
048                    postProcessor.postProcessBeforeInitialization(answer, answer.getClass().getName());
049                    postProcessor.postProcessAfterInitialization(answer, answer.getClass().getName());
050                } catch (Exception e) {
051                    throw new RuntimeCamelException("Error during post processing of bean " + answer, e);
052                }
053            }
054            return answer;
055        }
056    
057        @Override
058        public <T> T newInstance(Class<T> type, Object instance) {
059            T answer = delegate.newInstance(type, instance);
060            if (answer != null) {
061                try {
062                    postProcessor.postProcessBeforeInitialization(answer, answer.getClass().getName());
063                    postProcessor.postProcessAfterInitialization(answer, answer.getClass().getName());
064                } catch (Exception e) {
065                    throw new RuntimeCamelException("Error during post processing of bean " + answer, e);
066                }
067            }
068            return answer;
069        }
070    }