org.apache.tajo.json.DatumAdapter.java Source code

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Here is the source code for org.apache.tajo.json.DatumAdapter.java

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/**
 * 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 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 = CommonGsonHelper.getOrDie(jsonObject, "type").getAsString();
        TajoDataTypes.Type type = TajoDataTypes.Type.valueOf(typeName);
        switch (type) {
        case DATE:
            return new DateDatum(CommonGsonHelper.getOrDie(jsonObject, "value").getAsInt());
        case TIME:
            return new TimeDatum(CommonGsonHelper.getOrDie(jsonObject, "value").getAsLong());
        case TIMESTAMP:
            return new TimestampDatum(CommonGsonHelper.getOrDie(jsonObject, "value").getAsLong());
        case INTERVAL:
            String[] values = CommonGsonHelper.getOrDie(jsonObject, "value").getAsString().split(",");

            return new IntervalDatum(Integer.parseInt(values[0]), Long.parseLong(values[1]));
        default:
            return context.deserialize(CommonGsonHelper.getOrDie(jsonObject, "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", src.asInt8());
            break;
        case INTERVAL:
            IntervalDatum interval = (IntervalDatum) src;
            jsonObj.addProperty("value", interval.getMonths() + "," + interval.getMilliSeconds());
            break;
        default:
            jsonObj.add("body", context.serialize(src));
        }

        return jsonObj;
    }
}