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.sdk.util.construction;
  
  import static org.apache.beam.vendor.guava.v32_1_2_jre.com.google.common.base.Preconditions.checkArgument;
  
  import com.google.auto.service.AutoService;
  import java.io.IOException;
  import java.util.Collections;
  import java.util.Map;
  import org.apache.beam.model.pipeline.v1.RunnerApi;
  import org.apache.beam.model.pipeline.v1.RunnerApi.FunctionSpec;
  import org.apache.beam.model.pipeline.v1.RunnerApi.WindowIntoPayload;
  import org.apache.beam.sdk.runners.AppliedPTransform;
  import org.apache.beam.sdk.transforms.PTransform;
  import org.apache.beam.sdk.transforms.windowing.Window;
  import org.apache.beam.sdk.transforms.windowing.WindowFn;
  import org.apache.beam.vendor.grpc.v1p69p0.com.google.protobuf.InvalidProtocolBufferException;
  import org.checkerframework.checker.nullness.qual.Nullable;
  
  /**
   * Utility methods for translating a {@link Window.Assign} to and from {@link RunnerApi}
   * representations.
   */
  @SuppressWarnings({
    "nullness", // TODO(https://github.com/apache/beam/issues/20497)
    "rawtypes" // TODO(https://github.com/apache/beam/issues/20447)
  })
  public class WindowIntoTranslation {
  
    static class WindowAssignTranslator
        implements PTransformTranslation.TransformPayloadTranslator<Window.Assign<?>> {
  
      @Override
      public String getUrn() {
        return PTransformTranslation.ASSIGN_WINDOWS_TRANSFORM_URN;
      }
  
      @Override
      public FunctionSpec translate(
          AppliedPTransform<?, ?, Window.Assign<?>> transform, SdkComponents components) {
        return FunctionSpec.newBuilder()
            .setUrn("beam:transform:window:v1")
            .setPayload(
                WindowIntoTranslation.toProto(transform.getTransform(), components).toByteString())
            .build();
      }
    }
  
    public static WindowIntoPayload toProto(Window.Assign<?> transform, SdkComponents components) {
      return WindowIntoPayload.newBuilder()
          .setWindowFn(WindowingStrategyTranslation.toProto(transform.getWindowFn(), components))
          .build();
    }
  
    public static WindowIntoPayload getWindowIntoPayload(AppliedPTransform<?, ?, ?> application) {
      RunnerApi.PTransform transformProto;
      try {
        SdkComponents components = SdkComponents.create(application.getPipeline().getOptions());
        transformProto =
            PTransformTranslation.toProto(application, Collections.emptyList(), components);
      } catch (IOException exc) {
        throw new RuntimeException(exc);
      }
  
      checkArgument(
          PTransformTranslation.ASSIGN_WINDOWS_TRANSFORM_URN.equals(
              transformProto.getSpec().getUrn()),
          "Illegal attempt to extract %s from transform %s with name \"%s\" and URN \"%s\"",
          Window.Assign.class.getSimpleName(),
          application.getTransform(),
          application.getFullName(),
          transformProto.getSpec().getUrn());
  
      try {
        return WindowIntoPayload.parseFrom(transformProto.getSpec().getPayload());
      } catch (InvalidProtocolBufferException exc) {
        throw new IllegalStateException(
            String.format(
                "%s translated %s with URN '%s' but payload was not a %s",
                PTransformTranslation.class.getSimpleName(),
                application,
                PTransformTranslation.ASSIGN_WINDOWS_TRANSFORM_URN,
                WindowIntoPayload.class.getSimpleName()),
            exc);
      }
    }
  
    public static @Nullable WindowFn<?, ?> getWindowFn(AppliedPTransform<?, ?, ?> application) {
      return WindowingStrategyTranslation.windowFnFromProto(
          getWindowIntoPayload(application).getWindowFn());
    }
  
    /** A {@link PTransformTranslation.TransformPayloadTranslator} for {@link Window}. */
    public static class WindowIntoPayloadTranslator
        implements PTransformTranslation.TransformPayloadTranslator<Window.Assign<?>> {
      public static PTransformTranslation.TransformPayloadTranslator create() {
        return new WindowIntoPayloadTranslator();
      }
  
      private WindowIntoPayloadTranslator() {}
  
      @Override
      public String getUrn() {
        return PTransformTranslation.ASSIGN_WINDOWS_TRANSFORM_URN;
      }
  
      @Override
      public FunctionSpec translate(
          AppliedPTransform<?, ?, Window.Assign<?>> transform, SdkComponents components) {
        WindowIntoPayload payload = toProto(transform.getTransform(), components);
        return RunnerApi.FunctionSpec.newBuilder()
            .setUrn(getUrn(transform.getTransform()))
            .setPayload(payload.toByteString())
            .build();
      }
    }
  
    /** Registers {@link WindowIntoPayloadTranslator}. */
    @AutoService(TransformPayloadTranslatorRegistrar.class)
    public static class Registrar implements TransformPayloadTranslatorRegistrar {
      @Override
      public Map<
              ? extends Class<? extends PTransform>,
              ? extends PTransformTranslation.TransformPayloadTranslator>
          getTransformPayloadTranslators() {
        return Collections.singletonMap(Window.Assign.class, new WindowIntoPayloadTranslator());
      }
    }
  }
  