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.expansion.service;
  
  import com.google.auto.service.AutoService;
  import com.google.auto.value.AutoValue;
  import java.io.IOException;
  import java.util.Collections;
  import java.util.List;
  import org.apache.beam.model.pipeline.v1.RunnerApi;
  import org.apache.beam.sdk.schemas.AutoValueSchema;
  import org.apache.beam.sdk.schemas.annotations.DefaultSchema;
  import org.apache.beam.sdk.schemas.transforms.SchemaTransform;
  import org.apache.beam.sdk.schemas.transforms.SchemaTransformProvider;
  import org.apache.beam.sdk.schemas.transforms.TypedSchemaTransformProvider;
  import org.apache.beam.sdk.transforms.windowing.Window;
  import org.apache.beam.sdk.util.construction.WindowingStrategyTranslation;
  import org.apache.beam.sdk.values.PCollection;
  import org.apache.beam.sdk.values.PCollectionRowTuple;
  import org.apache.beam.sdk.values.Row;
  import org.apache.beam.sdk.values.WindowingStrategy;
  
  /**
   * An implementation of {@link TypedSchemaTransformProvider} for WindowInto.
   *
   * <p><b>Internal only:</b> This class is actively being worked on, and it will likely change. We
   * provide no backwards compatibility guarantees, and it should not be implemented outside the Beam
   * repository.
   */
  @SuppressWarnings({
    "nullness" // TODO(https://github.com/apache/beam/issues/20497)
  })
  @AutoService(SchemaTransformProvider.class)
  public class WindowIntoTransformProvider
      extends TypedSchemaTransformProvider<WindowIntoTransformProvider.Configuration> {
    private static final String INPUT_ROWS_TAG = "input";
  
    protected static final String OUTPUT_ROWS_TAG = "output";
  
    @Override
    protected Class<Configuration> configurationClass() {
      return Configuration.class;
    }
  
    @Override
    protected SchemaTransform from(Configuration configuration) {
      try {
        return new WindowIntoStrategy(
            (WindowingStrategy<Row, ?>)
                WindowingStrategyTranslation.fromProto(
                    RunnerApi.WindowingStrategy.parseFrom(
                        configuration.getSerializedWindowingStrategy()),
                    null));
      } catch (IOException exn) {
        throw new RuntimeException(exn);
      }
    }
  
    @Override
    public String identifier() {
      return "beam:schematransform:org.apache.beam:yaml:window_into_strategy:v1";
    }
  
    @Override
    public List<String> inputCollectionNames() {
      return Collections.singletonList(INPUT_ROWS_TAG);
    }
  
    @Override
    public List<String> outputCollectionNames() {
      return Collections.singletonList(OUTPUT_ROWS_TAG);
    }
  
    @DefaultSchema(AutoValueSchema.class)
    @AutoValue
    public abstract static class Configuration {
  
      @SuppressWarnings({"AutoValueMutable", "mutable"})
      public abstract byte[] getSerializedWindowingStrategy();
  
      public static Builder builder() {
        return new AutoValue_WindowIntoTransformProvider_Configuration.Builder();
      }
  
      @AutoValue.Builder
      public abstract static class Builder {
  
        public abstract Builder setSerializedWindowingStrategy(byte[] serializedWindowingStrategy);
  
        public abstract Configuration build();
      }
    }
  
    private static class WindowIntoStrategy extends SchemaTransform {
  
      private final WindowingStrategy<Row, ?> windowingStrategy;
  
      WindowIntoStrategy(WindowingStrategy<Row, ?> windowingStrategy) {
        this.windowingStrategy = windowingStrategy;
      }
  
      @Override
      public PCollectionRowTuple expand(PCollectionRowTuple inputTuple) {
        PCollection<Row> input = inputTuple.get(INPUT_ROWS_TAG);
        return PCollectionRowTuple.of(
            OUTPUT_ROWS_TAG,
            input
                .apply(Window.Assign.<Row>createInternal(windowingStrategy))
                .setCoder(input.getCoder()));
      }
    }
  }
  