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.values;
  
  import com.google.auto.value.AutoValue;
  import org.apache.beam.sdk.annotations.Internal;
  import org.apache.beam.vendor.guava.v32_1_2_jre.com.google.common.collect.Iterables;
  
  /**
   * <b><i>For internal use only; no backwards-compatibility guarantees.</i></b>
   *
   * <p>A (TupleTag, PValue) pair used in the expansion of a {@link PInput} or {@link POutput}.
   */
  @AutoValue
  @Internal
  public abstract class TaggedPValue {
    public static TaggedPValue of(TupleTag<?> tag, PCollection<?> value) {
      return new AutoValue_TaggedPValue(tag, value);
    }
  
    @SuppressWarnings({"keyfor", "nullness"})
    public static TaggedPValue ofExpandedValue(PCollection<?> value) {
      return of(Iterables.getOnlyElement(value.expand().keySet()), value);
    }
  
    /** Returns the local tag associated with the {@link PValue}. */
    public abstract TupleTag<?> getTag();
  
    /** Returns the {@link PCollection}. */
    public abstract PCollection<?> getValue();
  }
  