/*
 * 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.gobblin.runtime;

import com.google.gson.Gson;

import org.apache.gobblin.configuration.State;
import org.apache.gobblin.source.extractor.CheckpointableWatermark;


/**
 * Making {@link CheckpointableWatermark} look like {@link State} so it can be
 * stored in a Gobblin state store.
 */
public class CheckpointableWatermarkState extends State {

  /**
   * Create a CheckpointableWatermarkState object from a CheckpointableWatermark
   * @param watermark: the checkpointable watermark
   * @param gson: the instance of {@link Gson} to use for serializing the {@param watermark}.
   */
  public CheckpointableWatermarkState(CheckpointableWatermark watermark, Gson gson) {
    super.setProp(watermark.getSource(), gson.toJsonTree(watermark));
    super.setId(watermark.getSource());
  }

  public String getSource() {
    return getId();
  }

  /**
   * Needed for reflection based construction.
   */
  public CheckpointableWatermarkState() {
  }

}
