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.io;
  
  import java.util.Map;
  import org.apache.beam.sdk.Pipeline;
  import org.apache.beam.sdk.transforms.PTransform;
  import org.apache.beam.sdk.values.KV;
  import org.apache.beam.sdk.values.PCollection;
  import org.apache.beam.sdk.values.PInput;
  import org.apache.beam.sdk.values.POutput;
  import org.apache.beam.sdk.values.PValue;
  import org.apache.beam.sdk.values.TupleTag;
  import org.apache.beam.vendor.guava.v32_1_2_jre.com.google.common.collect.ImmutableMap;
  
  /** The result of a {@link WriteFiles} transform. */
  public class WriteFilesResult<DestinationT> implements POutput {
    private final Pipeline pipeline;
    private final TupleTag<KV<DestinationT, String>> perDestinationOutputFilenamesTag;
    private final PCollection<KV<DestinationT, String>> perDestinationOutputFilenames;
  
    private WriteFilesResult(
        Pipeline pipeline,
        TupleTag<KV<DestinationT, String>> perDestinationOutputFilenamesTag,
        PCollection<KV<DestinationT, String>> perDestinationOutputFilenames) {
      this.pipeline = pipeline;
      this.perDestinationOutputFilenamesTag = perDestinationOutputFilenamesTag;
      this.perDestinationOutputFilenames = perDestinationOutputFilenames;
    }
  
    static <DestinationT> WriteFilesResult<DestinationT> in(
        Pipeline pipeline,
        TupleTag<KV<DestinationT, String>> perDestinationOutputFilenamesTag,
        PCollection<KV<DestinationT, String>> perDestinationOutputFilenames) {
      return new WriteFilesResult<>(
          pipeline, perDestinationOutputFilenamesTag, perDestinationOutputFilenames);
    }
  
    @Override
    public Map<TupleTag<?>, PValue> expand() {
      return ImmutableMap.of(perDestinationOutputFilenamesTag, perDestinationOutputFilenames);
    }
  
    @Override
    public Pipeline getPipeline() {
      return pipeline;
    }
  
    @Override
    public void finishSpecifyingOutput(
        String transformName, PInput input, PTransform<?, ?> transform) {}
  
    /**
     * Returns a {@link PCollection} of all output filenames generated by this {@link WriteFiles}
     * organized by user destination type.
     */
    public PCollection<KV<DestinationT, String>> getPerDestinationOutputFilenames() {
      return perDestinationOutputFilenames;
    }
  }
  