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.translation;
  
  import java.util.Collections;
  import java.util.HashMap;
  import java.util.Map;
  import org.apache.beam.sdk.Pipeline;
  import org.apache.beam.sdk.runners.TransformHierarchy;
  import org.apache.beam.sdk.util.NameUtils;
  import org.apache.beam.sdk.values.PCollectionView;
  import org.apache.beam.sdk.values.PValue;
  
  /**
   * This class generates an ID for each {@link PValue} during a topological traversal of the BEAM
   * {@link Pipeline}.
   */
  @SuppressWarnings({
    "rawtypes", // TODO(https://github.com/apache/beam/issues/20447)
    "nullness" // TODO(https://github.com/apache/beam/issues/20497)
  })
  public class PViewToIdMapper extends Pipeline.PipelineVisitor.Defaults {
    private final Map<PValue, String> idMap = new HashMap<>();
    private int nextId;
  
    public static Map<PValue, String> buildIdMap(Pipeline pipeline) {
      final PViewToIdMapper mapper = new PViewToIdMapper();
      pipeline.traverseTopologically(mapper);
      return mapper.getIdMap();
    }
  
    private PViewToIdMapper() {}
  
    @Override
    public void visitValue(PValue value, TransformHierarchy.Node producer) {
      final String valueDesc = pValueToString(value).replaceFirst(".*:([a-zA-Z#0-9]+).*", "$1");
  
      final String samzaSafeValueDesc = valueDesc.replaceAll("[^A-Za-z0-9_-]", "_");
  
      idMap.put(value, String.format("%d-%s", nextId++, samzaSafeValueDesc));
    }
  
    @Override
    public void visitPrimitiveTransform(TransformHierarchy.Node node) {
      if (node.getTransform() instanceof SamzaPublishView) {
        final PCollectionView view = ((SamzaPublishView) node.getTransform()).getView();
        visitValue(view, node);
      }
    }
  
    public Map<PValue, String> getIdMap() {
      return Collections.unmodifiableMap(idMap);
    }
  
    /**
     * This method is created to replace the {@link org.apache.beam.sdk.values.PValueBase#toString()}
     * with the old implementation that doesn't contain the hashcode.
     */
    private static String pValueToString(PValue value) {
      String name;
      try {
        name = value.getName();
      } catch (IllegalStateException e) {
        name = "<unnamed>";
      }
      return name + " [" + NameUtils.approximateSimpleName(value.getClass()) + "]";
    }
  }
  