org.apache.twill.internal.json.TwillRunnableSpecificationCodec.java Source code

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Here is the source code for org.apache.twill.internal.json.TwillRunnableSpecificationCodec.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.twill.internal.json;

import com.google.common.reflect.TypeToken;
import com.google.gson.JsonDeserializationContext;
import com.google.gson.JsonDeserializer;
import com.google.gson.JsonElement;
import com.google.gson.JsonObject;
import com.google.gson.JsonParseException;
import com.google.gson.JsonSerializationContext;
import com.google.gson.JsonSerializer;
import org.apache.twill.api.TwillRunnableSpecification;
import org.apache.twill.internal.DefaultTwillRunnableSpecification;

import java.lang.reflect.Type;
import java.util.Map;

/**
 * Gson codec for {@link TwillRunnableSpecification}.
 */
final class TwillRunnableSpecificationCodec
        implements JsonSerializer<TwillRunnableSpecification>, JsonDeserializer<TwillRunnableSpecification> {

    @Override
    public JsonElement serialize(TwillRunnableSpecification src, Type typeOfSrc, JsonSerializationContext context) {
        JsonObject json = new JsonObject();

        json.addProperty("classname", src.getClassName());
        json.addProperty("name", src.getName());
        json.add("arguments", context.serialize(src.getConfigs(), new TypeToken<Map<String, String>>() {
        }.getType()));

        return json;
    }

    @Override
    public TwillRunnableSpecification deserialize(JsonElement json, Type typeOfT,
            JsonDeserializationContext context) throws JsonParseException {
        JsonObject jsonObj = json.getAsJsonObject();

        String className = jsonObj.get("classname").getAsString();
        String name = jsonObj.get("name").getAsString();
        Map<String, String> arguments = context.deserialize(jsonObj.get("arguments"),
                new TypeToken<Map<String, String>>() {
                }.getType());

        return new DefaultTwillRunnableSpecification(className, name, arguments);
    }
}