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.direct;
  
  import java.util.Collection;
  import org.apache.beam.sdk.io.Read;
  import org.apache.beam.sdk.options.PipelineOptions;
  import org.apache.beam.sdk.runners.AppliedPTransform;
  import org.apache.beam.sdk.transforms.PTransform;
  import org.apache.beam.sdk.util.construction.ReadTranslation;
  import org.apache.beam.sdk.values.PBegin;
  import org.apache.beam.sdk.values.PCollection;
  import org.checkerframework.checker.nullness.qual.Nullable;
  
  /**
   * A {@link TransformEvaluatorFactory} that produces {@link TransformEvaluator TransformEvaluators}
   * for the {@link Read Read} primitives, whether bounded or unbounded.
   */
  final class ReadEvaluatorFactory implements TransformEvaluatorFactory {
  
    final BoundedReadEvaluatorFactory boundedFactory;
    final UnboundedReadEvaluatorFactory unboundedFactory;
  
    public ReadEvaluatorFactory(EvaluationContext context, PipelineOptions options) {
      boundedFactory = new BoundedReadEvaluatorFactory(context, options);
      unboundedFactory = new UnboundedReadEvaluatorFactory(context, options);
    }
  
    @Override
    public <InputT> @Nullable TransformEvaluator<InputT> forApplication(
        AppliedPTransform<?, ?, ?> application, CommittedBundle<?> inputBundle) throws Exception {
      switch (ReadTranslation.sourceIsBounded(application)) {
        case BOUNDED:
          return boundedFactory.forApplication(application, inputBundle);
        case UNBOUNDED:
          return unboundedFactory.forApplication(application, inputBundle);
        default:
          throw new IllegalArgumentException("PCollection is neither bounded nor unbounded?!?");
      }
    }
  
    @Override
    public void cleanup() throws Exception {
      boundedFactory.cleanup();
      unboundedFactory.cleanup();
    }
  
    static <T> InputProvider<T> inputProvider(EvaluationContext context, PipelineOptions options) {
      return new InputProvider<>(context, options);
    }
  
    private static class InputProvider<T> implements RootInputProvider<T, SourceShard<T>, PBegin> {
  
      private final UnboundedReadEvaluatorFactory.InputProvider<T> unboundedInputProvider;
      private final BoundedReadEvaluatorFactory.InputProvider<T> boundedInputProvider;
  
      InputProvider(EvaluationContext context, PipelineOptions options) {
        this.unboundedInputProvider =
            new UnboundedReadEvaluatorFactory.InputProvider<>(context, options);
        this.boundedInputProvider = new BoundedReadEvaluatorFactory.InputProvider<>(context, options);
      }
  
      @Override
      public Collection<CommittedBundle<SourceShard<T>>> getInitialInputs(
          AppliedPTransform<PBegin, PCollection<T>, PTransform<PBegin, PCollection<T>>>
              appliedTransform,
          int targetParallelism)
          throws Exception {
        switch (ReadTranslation.sourceIsBounded(appliedTransform)) {
          case BOUNDED:
            // This cast could be made unnecessary, but too much bounded polymorphism
            return (Collection)
                boundedInputProvider.getInitialInputs(appliedTransform, targetParallelism);
          case UNBOUNDED:
            // This cast could be made unnecessary, but too much bounded polymorphism
            return (Collection)
                unboundedInputProvider.getInitialInputs(appliedTransform, targetParallelism);
          default:
            throw new IllegalArgumentException("PCollection is neither bounded nor unbounded?!?");
        }
      }
    }
  }
  