org.apache.tajo.engine.json.EvalNodeAdapter.java Source code

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Here is the source code for org.apache.tajo.engine.json.EvalNodeAdapter.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.engine.json;

import com.google.gson.*;
import org.apache.tajo.engine.eval.EvalNode;
import org.apache.tajo.engine.eval.EvalType;
import org.apache.tajo.json.GsonSerDerAdapter;

import java.lang.reflect.Type;

public class EvalNodeAdapter implements GsonSerDerAdapter<EvalNode> {

    @Override
    public EvalNode deserialize(JsonElement json, Type type, JsonDeserializationContext ctx)
            throws JsonParseException {
        JsonObject jsonObject = json.getAsJsonObject();
        String nodeName = jsonObject.get("type").getAsString();
        Class clazz = EvalType.valueOf(nodeName).getBaseClass();
        return ctx.deserialize(jsonObject.get("body"), clazz);
    }

    @Override
    public JsonElement serialize(EvalNode evalNode, Type type, JsonSerializationContext ctx) {
        JsonObject json = new JsonObject();
        json.addProperty("type", evalNode.getType().name());
        json.add("body", ctx.serialize(evalNode));
        return json;
    }
}