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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,
   * 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.sdk.util.construction;
  
  import static org.apache.beam.vendor.guava.v32_1_2_jre.com.google.common.base.Preconditions.checkState;
  import static org.junit.Assert.assertEquals;
  
  import java.util.concurrent.atomic.AtomicReference;
  import org.apache.beam.model.pipeline.v1.RunnerApi.WindowIntoPayload;
  import org.apache.beam.sdk.Pipeline.PipelineVisitor;
  import org.apache.beam.sdk.coders.Coder;
  import org.apache.beam.sdk.io.GenerateSequence;
  import org.apache.beam.sdk.runners.AppliedPTransform;
  import org.apache.beam.sdk.runners.TransformHierarchy.Node;
  import org.apache.beam.sdk.testing.TestPipeline;
  import org.apache.beam.sdk.transforms.windowing.BoundedWindow;
  import org.apache.beam.sdk.transforms.windowing.FixedWindows;
  import org.apache.beam.sdk.transforms.windowing.GlobalWindow;
  import org.apache.beam.sdk.transforms.windowing.GlobalWindows;
  import org.apache.beam.sdk.transforms.windowing.PartitioningWindowFn;
  import org.apache.beam.sdk.transforms.windowing.Sessions;
  import org.apache.beam.sdk.transforms.windowing.SlidingWindows;
  import org.apache.beam.sdk.transforms.windowing.Window;
  import org.apache.beam.sdk.transforms.windowing.Window.Assign;
  import org.apache.beam.sdk.transforms.windowing.WindowFn;
  import org.apache.beam.vendor.grpc.v1p69p0.com.google.protobuf.InvalidProtocolBufferException;
  import org.apache.beam.vendor.guava.v32_1_2_jre.com.google.common.collect.ImmutableList;
  import org.checkerframework.checker.nullness.qual.Nullable;
  import org.joda.time.Duration;
  import org.joda.time.Instant;
  import org.junit.Rule;
  import org.junit.Test;
  import org.junit.runner.RunWith;
  import org.junit.runners.Parameterized;
  import org.junit.runners.Parameterized.Parameter;
  import org.junit.runners.Parameterized.Parameters;
  
  /** Tests for {@link WindowIntoTranslation}. */
  @RunWith(Parameterized.class)
  public class WindowIntoTranslationTest {
    @Parameters(name = "{index}: {0}")
    public static Iterable<WindowFn<?, ?>> data() {
      // This pipeline exists for construction, not to run any test.
      return ImmutableList.<WindowFn<?, ?>>builder()
          .add(FixedWindows.of(Duration.standardMinutes(10L)))
          .add(new GlobalWindows())
          .add(Sessions.withGapDuration(Duration.standardMinutes(15L)))
          .add(SlidingWindows.of(Duration.standardMinutes(5L)).every(Duration.standardMinutes(1L)))
          .add(new CustomWindows())
          .build();
    }
  
    @Parameter(0)
    public WindowFn<?, ?> windowFn;
  
    @Rule public TestPipeline pipeline = TestPipeline.create();
  
    @Test
    public void testToFromProto() throws InvalidProtocolBufferException {
      pipeline.apply(GenerateSequence.from(0)).apply(Window.<Long>into((WindowFn) windowFn));
  
      final AtomicReference<AppliedPTransform<?, ?, Assign<?>>> assign = new AtomicReference<>(null);
      pipeline.traverseTopologically(
          new PipelineVisitor.Defaults() {
            @Override
            public void visitPrimitiveTransform(Node node) {
              if (node.getTransform() instanceof Window.Assign) {
                checkState(assign.get() == null);
                assign.set(
                    (AppliedPTransform<?, ?, Assign<?>>) node.toAppliedPTransform(getPipeline()));
              }
            }
          });
      checkState(assign.get() != null);
  
      SdkComponents components = SdkComponents.create();
      components.registerEnvironment(Environments.createDockerEnvironment("java"));
      WindowIntoPayload payload =
          WindowIntoTranslation.toProto(assign.get().getTransform(), components);
  
      assertEquals(windowFn, WindowingStrategyTranslation.windowFnFromProto(payload.getWindowFn()));
    }
  
    private static class CustomWindows extends PartitioningWindowFn<String, BoundedWindow> {
      @Override
      public BoundedWindow assignWindow(Instant timestamp) {
        return GlobalWindow.INSTANCE;
      }
  
      @Override
      public boolean isCompatible(WindowFn<?, ?> other) {
        return getClass().equals(other.getClass());
      }
  
      @Override
      public Coder<BoundedWindow> windowCoder() {
        return (Coder) GlobalWindow.Coder.INSTANCE;
      }
  
      @Override
      public boolean equals(@Nullable Object other) {
        return other != null && other.getClass().equals(this.getClass());
      }
  
      @Override
      public int hashCode() {
        return getClass().hashCode();
      }
    }
  }
  