/*
* Copyright 2014-2015 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.List;
import org.springframework.beans.factory.config.ConfigurableListableBeanFactory;
import org.springframework.context.annotation.Bean;
import org.springframework.core.annotation.AnnotatedElementUtils;
import org.springframework.core.annotation.AnnotationUtils;
import org.springframework.integration.annotation.BridgeFrom;
import org.springframework.integration.annotation.BridgeTo;
import org.springframework.integration.handler.BridgeHandler;
import org.springframework.integration.util.MessagingAnnotationUtils;
import org.springframework.messaging.MessageChannel;
import org.springframework.messaging.MessageHandler;
import org.springframework.util.Assert;
import org.springframework.util.StringUtils;
/**
* Post-processor for the {@link BridgeFrom @BridgeFrom} annotation.
*
* @author Artem Bilan
* @since 4.0
*/
public class BridgeFromAnnotationPostProcessor extends AbstractMethodAnnotationPostProcessor<BridgeFrom> {
public BridgeFromAnnotationPostProcessor(ConfigurableListableBeanFactory beanFactory) {
super(beanFactory);
}
@Override
public boolean shouldCreateEndpoint(Method method, List<Annotation> annotations) {
boolean isBean = AnnotatedElementUtils.isAnnotated(method, Bean.class.getName());
Assert.isTrue(isBean, "'@BridgeFrom' is eligible only for '@Bean' methods");
boolean isMessageChannelBean = MessageChannel.class.isAssignableFrom(method.getReturnType());
Assert.isTrue(isMessageChannelBean, "'@BridgeFrom' is eligible only for 'MessageChannel' '@Bean' methods");
String channel = MessagingAnnotationUtils.resolveAttribute(annotations, "value", String.class);
Assert.isTrue(StringUtils.hasText(channel), "'@BridgeFrom.value()' (inputChannelName) must not be empty");
boolean hasBridgeTo = AnnotatedElementUtils.isAnnotated(method, BridgeTo.class.getName());
Assert.isTrue(!hasBridgeTo, "'@BridgeFrom' and '@BridgeTo' are mutually exclusive 'MessageChannel' " +
"'@Bean' method annotations");
return true;
}
@Override
protected String getInputChannelAttribute() {
return AnnotationUtils.VALUE;
}
@Override
protected MessageHandler createHandler(Object bean, Method method, List<Annotation> annotations) {
BridgeHandler handler = new BridgeHandler();
Object outputChannel = resolveTargetBeanFromMethodWithBeanAnnotation(method);
Assert.isInstanceOf(MessageChannel.class, outputChannel);
handler.setOutputChannel((MessageChannel) outputChannel);
return handler;
}
}