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.dataflow;
  
  import static org.apache.beam.runners.dataflow.util.Structs.addBoolean;
  import static org.apache.beam.runners.dataflow.util.Structs.addDictionary;
  import static org.apache.beam.runners.dataflow.util.Structs.addLong;
  
  import com.google.api.services.dataflow.model.SourceMetadata;
  import java.util.HashMap;
  import java.util.Map;
  import org.apache.beam.runners.dataflow.internal.CustomSources;
  import org.apache.beam.runners.dataflow.util.PropertyNames;
  import org.apache.beam.sdk.io.Source;
  import org.apache.beam.sdk.transforms.PTransform;
  import org.apache.beam.sdk.util.construction.SplittableParDo;
  import org.apache.beam.sdk.values.PCollection;
  
  /** Translator for the {@code Read} {@code PTransform} for the Dataflow back-end. */
  class ReadTranslator implements TransformTranslator<SplittableParDo.PrimitiveBoundedRead<?>> {
    @Override
    public void translate(
        SplittableParDo.PrimitiveBoundedRead<?> transform, TranslationContext context) {
      translateReadHelper(transform.getSource(), transform, context);
    }
  
    public static <T> void translateReadHelper(
        Source<T> source,
        PTransform<?, ? extends PCollection<?>> transform,
        TranslationContext context) {
      try {
        StepTranslationContext stepContext = context.addStep(transform, "ParallelRead");
        stepContext.addInput(PropertyNames.FORMAT, PropertyNames.CUSTOM_SOURCE_FORMAT);
        stepContext.addInput(
            PropertyNames.SOURCE_STEP_INPUT,
            cloudSourceToDictionary(
                CustomSources.serializeToCloudSource(source, context.getPipelineOptions())));
        stepContext.addOutput(PropertyNames.OUTPUT, context.getOutput(transform));
      } catch (Exception e) {
        throw new RuntimeException(e);
      }
    }
  
    // Represents a cloud Source as a dictionary for encoding inside the {@code SOURCE_STEP_INPUT}
    // property of CloudWorkflowStep.input.
    private static Map<String, Object> cloudSourceToDictionary(
        com.google.api.services.dataflow.model.Source source) {
      // Do not translate encoding - the source's encoding is translated elsewhere
      // to the step's output info.
      Map<String, Object> res = new HashMap<>();
      addDictionary(res, PropertyNames.SOURCE_SPEC, source.getSpec());
      if (source.getMetadata() != null) {
        addDictionary(
            res,
            PropertyNames.SOURCE_METADATA,
            cloudSourceMetadataToDictionary(source.getMetadata()));
      }
      if (source.getDoesNotNeedSplitting() != null) {
        addBoolean(
            res, PropertyNames.SOURCE_DOES_NOT_NEED_SPLITTING, source.getDoesNotNeedSplitting());
      }
      return res;
    }
  
    private static Map<String, Object> cloudSourceMetadataToDictionary(SourceMetadata metadata) {
      Map<String, Object> res = new HashMap<>();
      if (metadata.getEstimatedSizeBytes() != null) {
        addLong(res, PropertyNames.SOURCE_ESTIMATED_SIZE_BYTES, metadata.getEstimatedSizeBytes());
      }
      if (metadata.getInfinite() != null) {
        addBoolean(res, PropertyNames.SOURCE_IS_INFINITE, metadata.getInfinite());
      }
      return res;
    }
  }
  