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 java.util.ArrayList;
  import java.util.List;
  import org.apache.beam.sdk.Pipeline;
  import org.apache.beam.sdk.runners.TransformHierarchy;
  import org.apache.beam.sdk.transforms.PTransform;
  import org.apache.beam.sdk.values.PValue;
  
  /**
   * Provides a simple {@link org.apache.beam.sdk.Pipeline.PipelineVisitor} that records the
   * transformation tree.
   */
  class RecordingPipelineVisitor extends Pipeline.PipelineVisitor.Defaults {
  
    public final List<PTransform<?, ?>> transforms = new ArrayList<>();
    public final List<PValue> values = new ArrayList<>();
  
    @Override
    public void visitPrimitiveTransform(TransformHierarchy.Node node) {
      transforms.add(node.getTransform());
    }
  
    @Override
    public void visitValue(PValue value, TransformHierarchy.Node producer) {
      values.add(value);
    }
  }
  