twill-core/src/main/java/org/apache/twill/internal/json/ResourceReportAdapter.java

/*
 * 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.gson.Gson;
import com.google.gson.GsonBuilder;
import org.apache.twill.api.ResourceReport;
import org.apache.twill.api.TwillRunResources;

import java.io.Reader;
import java.io.Writer;

/**
 * This class provides utility to help encode/decode {@link ResourceReport} to/from Json.
 */
public final class ResourceReportAdapter {

  private final Gson gson;

  public static ResourceReportAdapter create() {
    return new ResourceReportAdapter();
  }

  private ResourceReportAdapter() {
    gson = new GsonBuilder()
              .serializeNulls()
              .setPrettyPrinting()
              .registerTypeAdapter(TwillRunResources.class, new TwillRunResourcesCodec())
              .registerTypeAdapter(ResourceReport.class, new ResourceReportCodec())
              .create();
  }

  public String toJson(ResourceReport report) {
    return gson.toJson(report, ResourceReport.class);
  }

  public void toJson(ResourceReport report, Writer writer) {
    gson.toJson(report, ResourceReport.class, writer);
  }

  public ResourceReport fromJson(String json) {
    return gson.fromJson(json, ResourceReport.class);
  }

  public ResourceReport fromJson(Reader reader) {
    return gson.fromJson(reader, ResourceReport.class);
  }
}