org.springframework.integration.support.json.Jackson2JsonMessageParser Maven / Gradle / Ivy
/*
* Copyright 2002-2019 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.integration.support.json;
import java.io.IOException;
import java.io.UncheckedIOException;
import java.util.LinkedHashMap;
import java.util.Map;
import org.springframework.lang.Nullable;
import org.springframework.messaging.Message;
import org.springframework.util.Assert;
import com.fasterxml.jackson.core.JsonFactory;
import com.fasterxml.jackson.core.JsonParser;
import com.fasterxml.jackson.core.JsonToken;
/**
* {@link JsonInboundMessageMapper.JsonMessageParser} implementation that parses JSON messages
* and builds a {@link Message} with the specified payload type from provided {@link JsonInboundMessageMapper}.
* Uses Jackson 2 JSON-processor (@link https://github.com/FasterXML).
*
* @author Artem Bilan
* @author Gary Russell
*
* @since 3.0
*/
public class Jackson2JsonMessageParser extends AbstractJacksonJsonMessageParser {
public Jackson2JsonMessageParser() {
this(new Jackson2JsonObjectMapper());
}
public Jackson2JsonMessageParser(Jackson2JsonObjectMapper objectMapper) {
super(objectMapper);
}
@Override
protected JsonParser createJsonParser(String jsonMessage) {
try {
return new JsonFactory().createParser(jsonMessage);
}
catch (IOException e) {
throw new UncheckedIOException(e);
}
}
@Override
protected Message parseWithHeaders(JsonParser parser, String jsonMessage,
@Nullable Map headersToAdd) {
try {
String error = AbstractJsonInboundMessageMapper.MESSAGE_FORMAT_ERROR + jsonMessage;
Assert.isTrue(JsonToken.START_OBJECT == parser.nextToken(), error);
Map headers = null;
Object payload = null;
while (JsonToken.END_OBJECT != parser.nextToken()) {
Assert.isTrue(JsonToken.FIELD_NAME == parser.getCurrentToken(), error);
boolean isHeadersToken = "headers".equals(parser.getCurrentName());
boolean isPayloadToken = "payload".equals(parser.getCurrentName());
Assert.isTrue(isHeadersToken || isPayloadToken, error);
if (isHeadersToken) {
Assert.isTrue(parser.nextToken() == JsonToken.START_OBJECT, error);
headers = readHeaders(parser, jsonMessage);
}
else if (isPayloadToken) {
parser.nextToken();
payload = this.readPayload(parser, jsonMessage);
}
}
Assert.notNull(headers, error);
return getMessageBuilderFactory()
.withPayload(payload)
.copyHeaders(headers)
.copyHeadersIfAbsent(headersToAdd)
.build();
}
catch (IOException e) {
throw new UncheckedIOException(e);
}
}
private Map readHeaders(JsonParser parser, String jsonMessage) throws IOException {
Map headers = new LinkedHashMap<>();
while (JsonToken.END_OBJECT != parser.nextToken()) {
String headerName = parser.getCurrentName();
parser.nextToken();
Object headerValue = this.readHeader(parser, headerName, jsonMessage);
headers.put(headerName, headerValue);
}
return headers;
}
}