/*
* Copyright 2017 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.support.json;
import java.io.IOException;
import java.util.HashMap;
import java.util.Map;
import org.springframework.integration.support.MutableMessageHeaders;
import org.springframework.messaging.Message;
import org.springframework.util.Assert;
import com.fasterxml.jackson.annotation.JsonTypeInfo;
import com.fasterxml.jackson.databind.DeserializationContext;
import com.fasterxml.jackson.databind.JavaType;
import com.fasterxml.jackson.databind.JsonNode;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.databind.deser.std.StdNodeBasedDeserializer;
import com.fasterxml.jackson.databind.type.TypeFactory;
/**
* A Jackson {@link StdNodeBasedDeserializer} extension for {@link Message} implementations.
*
* @author Artem Bilan
*
* @since 4.3.10
*/
public abstract class MessageJacksonDeserializer<T extends Message<?>> extends StdNodeBasedDeserializer<T> {
private static final long serialVersionUID = 1L;
private JavaType payloadType = TypeFactory.defaultInstance().constructType(Object.class);
private ObjectMapper mapper = new ObjectMapper();
protected MessageJacksonDeserializer(Class<T> targetType) {
super(targetType);
this.mapper.enableDefaultTyping(ObjectMapper.DefaultTyping.NON_FINAL, JsonTypeInfo.As.PROPERTY);
}
public void setMapper(ObjectMapper mapper) {
Assert.notNull(mapper, "'mapper' must not be null");
this.mapper = mapper;
}
protected final void setPayloadType(JavaType payloadType) {
Assert.notNull(payloadType, "'payloadType' must not be null");
this.payloadType = payloadType;
}
protected ObjectMapper getMapper() {
return this.mapper;
}
@Override
public T convert(JsonNode root, DeserializationContext ctxt) throws IOException {
Map<String, Object> headers = this.mapper.readValue(root.get("headers").traverse(),
TypeFactory.defaultInstance().constructMapType(HashMap.class, String.class, Object.class));
Object payload = this.mapper.readValue(root.get("payload").traverse(), this.payloadType);
return buildMessage(new MutableMessageHeaders(headers), payload, root, ctxt);
}
protected abstract T buildMessage(MutableMessageHeaders headers, Object payload, JsonNode root,
DeserializationContext ctxt) throws IOException;
}