io.trino.client.QueryDataClientJacksonModule Maven / Gradle / Ivy
/*
* 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 io.trino.client;
import com.fasterxml.jackson.core.JsonParser;
import com.fasterxml.jackson.core.JsonToken;
import com.fasterxml.jackson.core.Version;
import com.fasterxml.jackson.core.type.TypeReference;
import com.fasterxml.jackson.databind.DeserializationContext;
import com.fasterxml.jackson.databind.deser.std.StdDeserializer;
import com.fasterxml.jackson.databind.module.SimpleModule;
import io.trino.client.spooling.EncodedQueryData;
import java.io.IOException;
import java.util.List;
/**
* Decodes the direct and encoded protocols.
*
* If the "data" fields starts with an array - this is the direct protocol which requires reading values and wrapping them with a class.
*
* Otherwise, this is an encoded protocol.
*/
public class QueryDataClientJacksonModule
extends SimpleModule
{
private static final TypeReference>> DIRECT_FORMAT = new TypeReference>>(){};
private static final TypeReference ENCODED_FORMAT = new TypeReference(){};
public QueryDataClientJacksonModule()
{
super(QueryDataClientJacksonModule.class.getSimpleName(), Version.unknownVersion());
addDeserializer(QueryData.class, new Deserializer());
}
private static class Deserializer
extends StdDeserializer
{
public Deserializer()
{
super(QueryData.class);
}
@Override
public QueryData deserialize(JsonParser jsonParser, DeserializationContext deserializationContext)
throws IOException
{
// If this is not JSON_ARRAY we are dealing with direct data encoding
if (jsonParser.currentToken().equals(JsonToken.START_ARRAY)) {
return RawQueryData.of(jsonParser.readValueAs(DIRECT_FORMAT));
}
return jsonParser.readValueAs(ENCODED_FORMAT);
}
}
}