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.worker.graph;
  
  import static org.apache.beam.vendor.guava.v32_1_2_jre.com.google.common.base.Preconditions.checkNotNull;
  
  import com.google.api.services.dataflow.model.MultiOutputInfo;
  import com.google.auto.value.AutoValue;
  
  /** Container class for different types of graph edges. All edges only have reference equality. */
  @SuppressWarnings({
    "nullness" // TODO(https://github.com/apache/beam/issues/20497)
  })
  public class Edges {
    /** Base class for graph edges. All edges only have reference equality. */
    public abstract static class Edge implements Cloneable {
      @Override
      public final boolean equals(Object obj) {
        return this == obj;
      }
  
      @Override
      public final int hashCode() {
        return super.hashCode();
      }
  
      @Override
      public Edge clone() {
        try {
          return (Edge) super.clone();
        } catch (CloneNotSupportedException e) {
          throw new IllegalStateException(e);
        }
      }
    }
  
    /** An edge with no parameters. */
    @AutoValue
    public abstract static class DefaultEdge extends Edge {
      public static DefaultEdge create() {
        return new AutoValue_Edges_DefaultEdge();
      }
  
      @Override
      public DefaultEdge clone() {
        return (DefaultEdge) super.clone();
      }
    }
  
    /** An edge that stores a {@link MultiOutputInfo}. */
    @AutoValue
    public abstract static class MultiOutputInfoEdge extends Edge {
      public static MultiOutputInfoEdge create(MultiOutputInfo multiOutputInfo) {
        checkNotNull(multiOutputInfo);
        return new AutoValue_Edges_MultiOutputInfoEdge(multiOutputInfo);
      }
  
      public abstract MultiOutputInfo getMultiOutputInfo();
  
      @Override
      public MultiOutputInfoEdge clone() {
        return (MultiOutputInfoEdge) super.clone();
      }
    }
  
    /**
     * An edge which represents an ordering relationship where the predecessor must occur before the
     * successor.
     */
    @AutoValue
    public abstract static class HappensBeforeEdge extends Edge {
      public static HappensBeforeEdge create() {
        return new AutoValue_Edges_HappensBeforeEdge();
      }
  
      @Override
      public HappensBeforeEdge clone() {
        return (HappensBeforeEdge) super.clone();
      }
    }
  
    // Hide visibility to prevent instantiation
    private Edges() {}
  }
  