/*
* 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.Filter;
import org.springframework.integration.core.MessageSelector;
import org.springframework.integration.filter.MessageFilter;
import org.springframework.integration.filter.MethodInvokingSelector;
import org.springframework.integration.util.MessagingAnnotationUtils;
import org.springframework.messaging.MessageHandler;
import org.springframework.util.Assert;
import org.springframework.util.StringUtils;
/**
* Post-processor for Methods annotated with {@link Filter @Filter}.
*
* @author Mark Fisher
* @author Gary Russell
* @author Artem Bilan
* @since 2.0
*/
public class FilterAnnotationPostProcessor extends AbstractMethodAnnotationPostProcessor<Filter> {
public FilterAnnotationPostProcessor(ConfigurableListableBeanFactory beanFactory) {
super(beanFactory);
this.messageHandlerAttributes.addAll(Arrays.<String>asList("discardChannel", "throwExceptionOnRejection",
"adviceChain", "discardWithinAdvice"));
}
@Override
protected MessageHandler createHandler(Object bean, Method method, List<Annotation> annotations) {
MessageSelector selector;
if (AnnotatedElementUtils.isAnnotated(method, Bean.class.getName())) {
Object target = this.resolveTargetBeanFromMethodWithBeanAnnotation(method);
if (target instanceof MessageSelector) {
selector = (MessageSelector) target;
}
else if (this.extractTypeIfPossible(target, MessageFilter.class) != null) {
checkMessageHandlerAttributes(resolveTargetBeanName(method), annotations);
return (MessageHandler) target;
}
else {
selector = new MethodInvokingSelector(target);
}
}
else {
Assert.isTrue(boolean.class.equals(method.getReturnType()) || Boolean.class.equals(method.getReturnType()),
"The Filter annotation may only be applied to methods with a boolean return type.");
selector = new MethodInvokingSelector(bean, method);
}
MessageFilter filter = new MessageFilter(selector);
String discardWithinAdvice = MessagingAnnotationUtils.resolveAttribute(annotations, "discardWithinAdvice",
String.class);
if (StringUtils.hasText(discardWithinAdvice)) {
discardWithinAdvice = this.beanFactory.resolveEmbeddedValue(discardWithinAdvice);
if (StringUtils.hasText(discardWithinAdvice)) {
filter.setDiscardWithinAdvice(Boolean.parseBoolean(discardWithinAdvice));
}
}
String throwExceptionOnRejection = MessagingAnnotationUtils.resolveAttribute(annotations,
"throwExceptionOnRejection", String.class);
if (StringUtils.hasText(throwExceptionOnRejection)) {
String throwExceptionOnRejectionValue = this.beanFactory.resolveEmbeddedValue(throwExceptionOnRejection);
if (StringUtils.hasText(throwExceptionOnRejectionValue)) {
filter.setThrowExceptionOnRejection(Boolean.parseBoolean(throwExceptionOnRejectionValue));
}
}
String discardChannelName = MessagingAnnotationUtils.resolveAttribute(annotations, "discardChannel", String.class);
if (StringUtils.hasText(discardChannelName)) {
filter.setDiscardChannelName(discardChannelName);
}
this.setOutputChannelIfPresent(annotations, filter);
return filter;
}
}