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 java.util.Map;
  import org.apache.beam.sdk.annotations.Internal;
  import org.apache.beam.sdk.transforms.PTransform;
  
  /**
   * <b><i>For internal use. No backwards compatibility guarantees.</i></b>
   *
   * <p>A primitive value within Beam.
   */
  @Internal
  public interface PValue extends POutput, PInput {
  
    /** Returns the name of this {@link PValue}. */
    String getName();
  
    /**
     * {@inheritDoc}.
     *
     * @deprecated A {@link PValue} always expands into itself. Calling {@link #expand()} on a PValue
     *     is almost never appropriate.
     */
    @Deprecated
    @Override
    Map<TupleTag<?>, PValue> expand();
  
    /**
     * After building, finalizes this {@code PValue} to make it ready for being used as an input to a
     * {@link org.apache.beam.sdk.transforms.PTransform}.
     *
     * <p>Automatically invoked whenever {@code apply()} is invoked on this {@code PValue}. Users
     * should not normally call this explicitly.
     *
     * @param upstreamInput the {@link PInput} the {@link PTransform} was applied to to produce this
     *     output
     * @param upstreamTransform the {@link PTransform} that produced this {@link PValue}
     */
    @Internal
    void finishSpecifying(PInput upstreamInput, PTransform<?, ?> upstreamTransform);
  }
  