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.samza.util;
  
  import java.util.Set;
  import java.util.stream.Collectors;
  import org.apache.beam.sdk.util.construction.graph.ExecutableStage;
  import org.apache.beam.sdk.util.construction.graph.PipelineNode;
  import org.apache.beam.vendor.guava.v32_1_2_jre.com.google.common.base.Splitter;
  import org.apache.beam.vendor.guava.v32_1_2_jre.com.google.common.collect.Iterables;
  import org.apache.commons.collections.CollectionUtils;
  
  /** Utils for {@link org.apache.beam.runners.samza.runtime.DoFnOp}. */
  public class DoFnUtils {
  
    public static String toStepName(ExecutableStage executableStage) {
      /*
       * Look for the first/input ParDo/DoFn in this executable stage by
       * matching ParDo/DoFn's input PCollection with executable stage's
       * input PCollection
       */
      Set<PipelineNode.PTransformNode> inputs =
          executableStage.getTransforms().stream()
              .filter(
                  transform ->
                      transform
                          .getTransform()
                          .getInputsMap()
                          .containsValue(executableStage.getInputPCollection().getId()))
              .collect(Collectors.toSet());
  
      Set<String> outputIds =
          executableStage.getOutputPCollections().stream()
              .map(PipelineNode.PCollectionNode::getId)
              .collect(Collectors.toSet());
  
      /*
       * Look for the last/output ParDo/DoFn in this executable stage by
       * matching ParDo/DoFn's output PCollection(s) with executable stage's
       * out PCollection(s)
       */
      Set<PipelineNode.PTransformNode> outputs =
          executableStage.getTransforms().stream()
              .filter(
                  transform ->
                      CollectionUtils.containsAny(
                          transform.getTransform().getOutputsMap().values(), outputIds))
              .collect(Collectors.toSet());
  
      return String.format("[%s-%s]", toStepName(inputs), toStepName(outputs));
    }
  
    private static String toStepName(Set<PipelineNode.PTransformNode> nodes) {
      // TODO: format name when there are multiple input/output PTransform(s) in the ExecutableStage
      return nodes.isEmpty()
          ? ""
          : Iterables.get(
              Splitter.on('/').split(nodes.iterator().next().getTransform().getUniqueName()), 0);
    }
  }
  