/**
 * 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.apex.malhar.lib.window.impl;

import org.apache.apex.malhar.lib.window.ControlTuple;
import org.apache.hadoop.classification.InterfaceStability;

/**
 * The implementation of the Watermark tuple
 *
 * @since 3.5.0
 */
@InterfaceStability.Evolving
public class WatermarkImpl implements ControlTuple.Watermark
{
  private long timestamp;

  private WatermarkImpl()
  {
    // for kryo
  }

  public WatermarkImpl(long timestamp)
  {
    this.timestamp = timestamp;
  }

  @Override
  public long getTimestamp()
  {
    return timestamp;
  }

  @Override
  public String toString()
  {
    return "[Watermark " + getTimestamp() + "]";
  }
}
