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.sdk.util.construction.graph;
  
  import com.google.auto.value.AutoValue;
  import org.apache.beam.model.pipeline.v1.RunnerApi;
  import org.apache.beam.model.pipeline.v1.RunnerApi.ExecutableStagePayload.SideInputId;
  import org.apache.beam.model.pipeline.v1.RunnerApi.PCollection;
  import org.apache.beam.model.pipeline.v1.RunnerApi.PTransform;
  import org.apache.beam.sdk.util.construction.graph.PipelineNode.PCollectionNode;
  import org.apache.beam.sdk.util.construction.graph.PipelineNode.PTransformNode;
  import org.apache.beam.vendor.guava.v32_1_2_jre.com.google.common.base.MoreObjects;
  
  /**
   * A reference to a side input. This includes the PTransform that references the side input as well
   * as the PCollection referenced. Both are necessary in order to fully resolve a view.
   */
  @AutoValue
  public abstract class SideInputReference {
  
    /** Create a side input reference. */
    public static SideInputReference of(
        PTransformNode transform, String localName, PCollectionNode collection) {
      return new AutoValue_SideInputReference(transform, localName, collection);
    }
  
    /** Create a side input reference from a SideInputId proto and components. */
    public static SideInputReference fromSideInputId(
        SideInputId sideInputId, RunnerApi.Components components) {
      String transformId = sideInputId.getTransformId();
      String localName = sideInputId.getLocalName();
      String collectionId = components.getTransformsOrThrow(transformId).getInputsOrThrow(localName);
      PTransform transform = components.getTransformsOrThrow(transformId);
      PCollection collection = components.getPcollectionsOrThrow(collectionId);
      return SideInputReference.of(
          PipelineNode.pTransform(transformId, transform),
          localName,
          PipelineNode.pCollection(collectionId, collection));
    }
  
    /** The PTransform that uses this side input. */
    public abstract PTransformNode transform();
    /** The local name the referencing PTransform uses to refer to this side input. */
    public abstract String localName();
    /** The PCollection that backs this side input. */
    public abstract PCollectionNode collection();
  
    @Override
    public final String toString() {
      return MoreObjects.toStringHelper(this)
          .add("Transform", transform().toString())
          .add("PCollection", collection().toString())
          .toString();
    }
  }
  