/**
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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.apache.tajo.json;
import com.google.gson.*;
import org.apache.tajo.common.TajoDataTypes;
import org.apache.tajo.datum.*;
import org.joda.time.DateTime;
import java.lang.reflect.Type;
public class DatumAdapter implements GsonSerDerAdapter<Datum> {
@Override
public Datum deserialize(JsonElement json, Type typeOfT,
JsonDeserializationContext context) throws JsonParseException {
JsonObject jsonObject = json.getAsJsonObject();
String typeName = jsonObject.get("type").getAsString();
TajoDataTypes.Type type = TajoDataTypes.Type.valueOf(jsonObject.get("type").getAsString());
switch (type) {
case DATE:
return new DateDatum(jsonObject.get("value").getAsInt());
case TIME:
return new TimeDatum(jsonObject.get("value").getAsLong());
case TIMESTAMP:
return new TimestampDatum(new DateTime(jsonObject.get("value").getAsLong()));
default:
return context.deserialize(jsonObject.get("body"),
DatumFactory.getDatumClass(TajoDataTypes.Type.valueOf(typeName)));
}
}
@Override
public JsonElement serialize(Datum src, Type typeOfSrc, JsonSerializationContext context) {
JsonObject jsonObj = new JsonObject();
jsonObj.addProperty("type", src.type().name());
switch (src.type()) {
case DATE:
jsonObj.addProperty("value", src.asInt4());
break;
case TIME:
jsonObj.addProperty("value", src.asInt8());
break;
case TIMESTAMP:
jsonObj.addProperty("value", ((TimestampDatum)src).getMillis());
break;
default:
jsonObj.add("body", context.serialize(src));
}
return jsonObj;
}
}