spring SimpleMessageConverter 源码
spring SimpleMessageConverter 代码
文件路径：/spring-messaging/src/main/java/org/springframework/messaging/converter/SimpleMessageConverter.java
/*
* Copyright 2002-2014 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
*
* https://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.messaging.converter;
import org.springframework.lang.Nullable;
import org.springframework.messaging.Message;
import org.springframework.messaging.MessageHeaders;
import org.springframework.messaging.support.MessageBuilder;
import org.springframework.messaging.support.MessageHeaderAccessor;
import org.springframework.util.ClassUtils;
/**
* A simple converter that simply unwraps the message payload as long as it matches the
* expected target class. Or reversely, simply wraps the payload in a message.
*
* <p>Note that this converter ignores any content type information that may be present in
* message headers and should not be used if payload conversion is actually required.
*
* @author Rossen Stoyanchev
* @since 4.0
*/
public class SimpleMessageConverter implements MessageConverter {
@Override
@Nullable
public Object fromMessage(Message<?> message, Class<?> targetClass) {
Object payload = message.getPayload();
return (ClassUtils.isAssignableValue(targetClass, payload) ? payload : null);
}
@Override
public Message<?> toMessage(Object payload, @Nullable MessageHeaders headers) {
if (headers != null) {
MessageHeaderAccessor accessor = MessageHeaderAccessor.getAccessor(headers, MessageHeaderAccessor.class);
if (accessor != null && accessor.isMutable()) {
return MessageBuilder.createMessage(payload, accessor.getMessageHeaders());
}
}
return MessageBuilder.withPayload(payload).copyHeaders(headers).build();
}
}
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