co.cask.cdap.internal.app.MapReduceSpecificationCodec.java Source code

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Here is the source code for co.cask.cdap.internal.app.MapReduceSpecificationCodec.java

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/*
 * Copyright  2014 Cask Data, Inc.
 *
 * Licensed 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 co.cask.cdap.internal.app;

import co.cask.cdap.api.mapreduce.MapReduceSpecification;
import co.cask.cdap.internal.batch.DefaultMapReduceSpecification;
import com.google.gson.JsonDeserializationContext;
import com.google.gson.JsonElement;
import com.google.gson.JsonObject;
import com.google.gson.JsonParseException;
import com.google.gson.JsonPrimitive;
import com.google.gson.JsonSerializationContext;

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

/**
 *
 */
final class MapReduceSpecificationCodec extends AbstractSpecificationCodec<MapReduceSpecification> {

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

        jsonObj.add("className", new JsonPrimitive(src.getClassName()));
        jsonObj.add("name", new JsonPrimitive(src.getName()));
        jsonObj.add("description", new JsonPrimitive(src.getDescription()));
        jsonObj.add("mapperMemoryMB", new JsonPrimitive(src.getMapperMemoryMB()));
        jsonObj.add("reducerMemoryMB", new JsonPrimitive(src.getReducerMemoryMB()));
        if (src.getInputDataSet() != null) {
            jsonObj.add("inputDataSet", new JsonPrimitive(src.getInputDataSet()));
        }
        if (src.getOutputDataSet() != null) {
            jsonObj.add("outputDataSet", new JsonPrimitive(src.getOutputDataSet()));
        }
        jsonObj.add("datasets", serializeSet(src.getDataSets(), context, String.class));
        jsonObj.add("properties", serializeMap(src.getProperties(), context, String.class));

        return jsonObj;
    }

    @Override
    public MapReduceSpecification 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();
        String description = jsonObj.get("description").getAsString();
        int mapperMemoryMB = jsonObj.get("mapperMemoryMB").getAsInt();
        int reducerMemoryMB = jsonObj.get("reducerMemoryMB").getAsInt();
        JsonElement inputDataSetElem = jsonObj.get("inputDataSet");
        String inputDataSet = inputDataSetElem == null ? null : inputDataSetElem.getAsString();
        JsonElement outputDataSetElem = jsonObj.get("outputDataSet");
        String outputDataSet = outputDataSetElem == null ? null : outputDataSetElem.getAsString();

        Set<String> dataSets = deserializeSet(jsonObj.get("datasets"), context, String.class);
        Map<String, String> properties = deserializeMap(jsonObj.get("properties"), context, String.class);

        return new DefaultMapReduceSpecification(className, name, description, inputDataSet, outputDataSet,
                dataSets, properties, mapperMemoryMB, reducerMemoryMB);
    }
}