tajo.engine.json.EvalNodeAdapter.java Source code

Introduction

Here is the source code for tajo.engine.json.EvalNodeAdapter.java

Source

/*
 * Copyright 2012 Database Lab., Korea Univ.
 *
 * 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 tajo.engine.json;

import com.google.gson.*;
import tajo.engine.eval.EvalNode;

import java.lang.reflect.Type;

/**
 * @author jihoon
 *
 */
public class EvalNodeAdapter implements JsonSerializer<EvalNode>, JsonDeserializer<EvalNode> {

    @Override
    public EvalNode deserialize(JsonElement json, Type type, JsonDeserializationContext ctx)
            throws JsonParseException {
        JsonObject jsonObj = json.getAsJsonObject();
        String className = jsonObj.get("type").getAsString();
        JsonElement elem = jsonObj.get("properties");

        try {
            return ctx.deserialize(elem, Class.forName(className));
        } catch (ClassNotFoundException e) {
            e.printStackTrace();
        }
        return null;
    }

    @Override
    public JsonElement serialize(EvalNode evalNode, Type type, JsonSerializationContext ctx) {
        JsonObject json = new JsonObject();
        json.add("type", new JsonPrimitive(evalNode.getClass().getName()));
        json.add("properties", ctx.serialize(evalNode, evalNode.getClass()));
        return json;
    }

}