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 java.util.Map;
  import java.util.Objects;
  import org.apache.beam.model.pipeline.v1.RunnerApi.SideInput;
  import org.apache.beam.sdk.coders.Coder;
  import org.apache.beam.sdk.transforms.ViewFn;
  import org.apache.beam.sdk.transforms.windowing.WindowMappingFn;
  import org.apache.beam.sdk.values.PCollection;
  import org.apache.beam.sdk.values.PCollectionView;
  import org.apache.beam.sdk.values.PValue;
  import org.apache.beam.sdk.values.PValueBase;
  import org.apache.beam.sdk.values.TupleTag;
  import org.apache.beam.sdk.values.WindowedValue;
  import org.apache.beam.sdk.values.WindowingStrategy;
  import org.checkerframework.checker.nullness.qual.Nullable;
  
  /** A {@link PCollectionView} created from the components of a {@link SideInput}. */
  @SuppressWarnings({
    "nullness" // TODO(https://github.com/apache/beam/issues/20497)
  })
  public class RunnerPCollectionView<T> extends PValueBase implements PCollectionView<T> {
    private final TupleTag<Iterable<WindowedValue<?>>> tag;
    private final ViewFn<Iterable<WindowedValue<?>>, T> viewFn;
    private final WindowMappingFn<?> windowMappingFn;
    private final @Nullable WindowingStrategy<?, ?> windowingStrategy;
    private final @Nullable Coder<?> coder;
    private final transient @Nullable PCollection<?> pCollection;
  
    /** Create a new {@link RunnerPCollectionView} from the provided components. */
    public RunnerPCollectionView(
        @Nullable PCollection<?> pCollection,
        TupleTag<Iterable<WindowedValue<?>>> tag,
        ViewFn<Iterable<WindowedValue<?>>, T> viewFn,
        WindowMappingFn<?> windowMappingFn,
        @Nullable WindowingStrategy<?, ?> windowingStrategy,
        @Nullable Coder<?> coder) {
      this.pCollection = pCollection;
      this.tag = tag;
      this.viewFn = viewFn;
      this.windowMappingFn = windowMappingFn;
      this.windowingStrategy = windowingStrategy;
      this.coder = coder;
    }
  
    @Override
    public PCollection<?> getPCollection() {
      return pCollection;
    }
  
    @Override
    public TupleTag<Iterable<WindowedValue<?>>> getTagInternal() {
      return tag;
    }
  
    @Override
    public ViewFn<Iterable<WindowedValue<?>>, T> getViewFn() {
      return viewFn;
    }
  
    @Override
    public WindowMappingFn<?> getWindowMappingFn() {
      return windowMappingFn;
    }
  
    @Override
    public WindowingStrategy<?, ?> getWindowingStrategyInternal() {
      return windowingStrategy;
    }
  
    @Override
    public Coder<?> getCoderInternal() {
      return coder;
    }
  
    @Override
    public Map<TupleTag<?>, PValue> expand() {
      throw new UnsupportedOperationException(
          String.format("A %s cannot be expanded", RunnerPCollectionView.class.getSimpleName()));
    }
  
    @Override
    public boolean equals(@Nullable Object other) {
      if (!(other instanceof PCollectionView)) {
        return false;
      }
      @SuppressWarnings("unchecked")
      PCollectionView<?> otherView = (PCollectionView<?>) other;
      return tag.equals(otherView.getTagInternal());
    }
  
    @Override
    public int hashCode() {
      return Objects.hash(tag);
    }
  }
  