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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,
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   * See the License for the specific language governing permissions and
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  package org.apache.beam.runners.twister2.utils;
  
  import org.apache.beam.sdk.transforms.windowing.BoundedWindow;
  import org.apache.beam.sdk.transforms.windowing.WindowFn;
  import org.apache.beam.sdk.values.WindowedValue;
  import org.apache.beam.vendor.guava.v32_1_2_jre.com.google.common.collect.Iterables;
  import org.joda.time.Instant;
  
  /** doc. */
  @SuppressWarnings({"keyfor", "nullness"}) // TODO(https://github.com/apache/beam/issues/20497)
  public class Twister2AssignContext<T, W extends BoundedWindow>
      extends WindowFn<T, W>.AssignContext {
  
    private final WindowedValue<T> value;
  
    public Twister2AssignContext(WindowFn<T, W> fn, WindowedValue<T> value) {
      fn.super();
      this.value = value;
    }
  
    @Override
    public T element() {
      return value.getValue();
    }
  
    @Override
    public Instant timestamp() {
      return value.getTimestamp();
    }
  
    @Override
    public BoundedWindow window() {
      return Iterables.getOnlyElement(value.getWindows());
    }
  }
  