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.extensions.ml;
  
  import com.google.api.gax.longrunning.OperationFuture;
  import com.google.cloud.videointelligence.v1.AnnotateVideoProgress;
  import com.google.cloud.videointelligence.v1.AnnotateVideoRequest;
  import com.google.cloud.videointelligence.v1.AnnotateVideoResponse;
  import com.google.cloud.videointelligence.v1.Feature;
  import com.google.cloud.videointelligence.v1.VideoAnnotationResults;
  import com.google.cloud.videointelligence.v1.VideoContext;
  import com.google.cloud.videointelligence.v1.VideoIntelligenceServiceClient;
  import com.google.protobuf.ByteString;
  import java.io.IOException;
  import java.util.List;
  import java.util.Map;
  import java.util.concurrent.ExecutionException;
  import org.apache.beam.sdk.transforms.DoFn;
  import org.apache.beam.sdk.values.PCollectionView;
  
  /**
   * Base class for DoFns used in VideoIntelligence transforms.
   *
   * @param <T> Class of input data being passed in - either ByteString - video data encoded into.
   *     String or String - a GCS URI of the video to be annotated.
   */
  @SuppressWarnings({
    "nullness" // TODO(https://github.com/apache/beam/issues/20497)
  })
  abstract class AnnotateVideoFn<T> extends DoFn<T, List<VideoAnnotationResults>> {
  
    protected final PCollectionView<Map<T, VideoContext>> contextSideInput;
    protected final List<Feature> featureList;
    VideoIntelligenceServiceClient videoIntelligenceServiceClient;
  
    public AnnotateVideoFn(
        PCollectionView<Map<T, VideoContext>> contextSideInput, List<Feature> featureList) {
      this.contextSideInput = contextSideInput;
      this.featureList = featureList;
    }
  
    public AnnotateVideoFn(List<Feature> featureList) {
      contextSideInput = null;
      this.featureList = featureList;
    }
  
    @Setup
    public void setup() throws IOException {
      videoIntelligenceServiceClient = VideoIntelligenceServiceClient.create();
    }
  
    @Teardown
    public void teardown() {
      videoIntelligenceServiceClient.close();
    }
  
    /**
     * Call the Video Intelligence Cloud AI service and return annotation results.
     *
     * @param elementURI This or elementContents is required. GCS address of video to be annotated
     * @param elementContents this or elementURI is required. Hex-encoded contents of video to be
     *     annotated
     * @param videoContext Optional context for video annotation.
     * @return
     */
    List<VideoAnnotationResults> getVideoAnnotationResults(
        String elementURI, ByteString elementContents, VideoContext videoContext)
        throws InterruptedException, ExecutionException {
      AnnotateVideoRequest.Builder requestBuilder =
          AnnotateVideoRequest.newBuilder().addAllFeatures(featureList);
      if (elementURI != null) {
        requestBuilder.setInputUri(elementURI);
      } else if (elementContents != null) {
        requestBuilder.setInputContent(elementContents);
      } else {
        throw new IllegalArgumentException("Either elementURI or elementContents should be non-null");
      }
      if (videoContext != null) {
        requestBuilder.setVideoContext(videoContext);
      }
      AnnotateVideoRequest annotateVideoRequest = requestBuilder.build();
      OperationFuture<AnnotateVideoResponse, AnnotateVideoProgress> annotateVideoAsync =
          videoIntelligenceServiceClient.annotateVideoAsync(annotateVideoRequest);
      return annotateVideoAsync.get().getAnnotationResultsList();
    }
  
    /** Process element implementation required. */
    @ProcessElement
    public abstract void processElement(ProcessContext context)
        throws ExecutionException, InterruptedException;
  }
  