content: /*
   * 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.beam.runners.dataflow.worker.util;
  
  import java.util.Collection;
  import java.util.Collections;
  import java.util.Objects;
  import org.apache.beam.sdk.transforms.windowing.BoundedWindow;
  import org.apache.beam.sdk.transforms.windowing.PaneInfo;
  import org.apache.beam.sdk.values.WindowedValue;
  import org.apache.beam.vendor.guava.v32_1_2_jre.com.google.common.base.MoreObjects;
  import org.checkerframework.checker.nullness.qual.Nullable;
  import org.joda.time.Instant;
  
  /**
   * A value in no windows.
   *
   * <p>Uses of this class can probably be replaced by alternate design patterns, and probably should
   * be.
   *
   * <p>Technically, such a value does not exist and can be dropped by a runner at any time. However,
   * the Dataflow worker uses this in places to pass a {@link WindowedValue} to a method that requires
   * one without having to provide the global window, which could alter size estimations, etc.
   */
  public class ValueInEmptyWindows<T> implements WindowedValue<T> {
    private final T value;
  
    public ValueInEmptyWindows(T value) {
      this.value = value;
    }
  
    @Override
    public PaneInfo getPaneInfo() {
      return PaneInfo.NO_FIRING;
    }
  
    @Override
    public @Nullable String getRecordId() {
      return null;
    }
  
    @Override
    public @Nullable Long getRecordOffset() {
      return null;
    }
  
    @Override
    public Iterable<WindowedValue<T>> explodeWindows() {
      return Collections.emptyList();
    }
  
    @Override
    public T getValue() {
      return value;
    }
  
    @Override
    public <NewT> WindowedValue<NewT> withValue(NewT newValue) {
      return new ValueInEmptyWindows<>(newValue);
    }
  
    @Override
    public Instant getTimestamp() {
      return BoundedWindow.TIMESTAMP_MIN_VALUE;
    }
  
    @Override
    public Collection<? extends BoundedWindow> getWindows() {
      return Collections.emptyList();
    }
  
    @Override
    public boolean equals(@Nullable Object o) {
      if (o instanceof ValueInEmptyWindows) {
        ValueInEmptyWindows<?> that = (ValueInEmptyWindows<?>) o;
        return Objects.equals(this.getValue(), that.getValue());
      } else {
        return super.equals(o);
      }
    }
  
    @Override
    public int hashCode() {
      return Objects.hash(getValue());
    }
  
    @Override
    public String toString() {
      return MoreObjects.toStringHelper(getClass())
          .add("value", getValue())
          .add("paneInfo", getPaneInfo())
          .toString();
    }
  }
  