/*
* Copyright 2002-2015 the original author or authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.springframework.integration.config.annotation;
import java.lang.annotation.Annotation;
import java.lang.reflect.Method;
import java.util.Arrays;
import java.util.List;
import org.springframework.beans.factory.config.ConfigurableListableBeanFactory;
import org.springframework.context.annotation.Bean;
import org.springframework.core.annotation.AnnotatedElementUtils;
import org.springframework.integration.annotation.Transformer;
import org.springframework.integration.handler.AbstractReplyProducingMessageHandler;
import org.springframework.integration.transformer.MessageTransformingHandler;
import org.springframework.integration.transformer.MethodInvokingTransformer;
import org.springframework.messaging.MessageHandler;
/**
* Post-processor for Methods annotated with {@link Transformer @Transformer}.
*
* @author Mark Fisher
* @author Gary Russell
* @author Artem Bilan
*/
public class TransformerAnnotationPostProcessor extends AbstractMethodAnnotationPostProcessor<Transformer> {
public TransformerAnnotationPostProcessor(ConfigurableListableBeanFactory beanFactory) {
super(beanFactory);
this.messageHandlerAttributes.addAll(Arrays.<String>asList("outputChannel", "adviceChain"));
}
@Override
protected MessageHandler createHandler(Object bean, Method method, List<Annotation> annotations) {
org.springframework.integration.transformer.Transformer transformer;
if (AnnotatedElementUtils.isAnnotated(method, Bean.class.getName())) {
Object target = this.resolveTargetBeanFromMethodWithBeanAnnotation(method);
transformer = this.extractTypeIfPossible(target,
org.springframework.integration.transformer.Transformer.class);
if (transformer == null) {
if (this.extractTypeIfPossible(target, AbstractReplyProducingMessageHandler.class) != null) {
checkMessageHandlerAttributes(resolveTargetBeanName(method), annotations);
return (MessageHandler) target;
}
transformer = new MethodInvokingTransformer(target);
}
}
else {
transformer = new MethodInvokingTransformer(bean, method);
}
MessageTransformingHandler handler = new MessageTransformingHandler(transformer);
this.setOutputChannelIfPresent(annotations, handler);
return handler;
}
}