private com.google.protobuf.SingleFieldBuilderV3<
            com.google.cloud.video.stitcher.v1.MediaCdnKey,
            com.google.cloud.video.stitcher.v1.MediaCdnKey.Builder,
            com.google.cloud.video.stitcher.v1.MediaCdnKeyOrBuilder>
        getMediaCdnKeyFieldBuilder() {
      if (mediaCdnKeyBuilder_ == null) {
        if (!(cdnKeyConfigCase_ == 8)) {
          cdnKeyConfig_ = com.google.cloud.video.stitcher.v1.MediaCdnKey.getDefaultInstance();
        }
        mediaCdnKeyBuilder_ =
            new com.google.protobuf.SingleFieldBuilderV3<
                com.google.cloud.video.stitcher.v1.MediaCdnKey,
                com.google.cloud.video.stitcher.v1.MediaCdnKey.Builder,
                com.google.cloud.video.stitcher.v1.MediaCdnKeyOrBuilder>(
                (com.google.cloud.video.stitcher.v1.MediaCdnKey) cdnKeyConfig_,
                getParentForChildren(),
                isClean());
        cdnKeyConfig_ = null;
      }
      cdnKeyConfigCase_ = 8;
      onChanged();
      return mediaCdnKeyBuilder_;
    }
<pre>
The configuration for a Media CDN key.
</pre>

<code>.google.cloud.video.stitcher.v1.MediaCdnKey media_cdn_key = 8;</code>
java-video-stitcher/proto-google-cloud-video-stitcher-v1/src/main/java/com/google/cloud/video/stitcher/v1/CdnKey.java