@java.lang.Override
      public com.google.storagetransfer.v1.proto.TransferTypes.GcsDataOrBuilder
          getGcsDataSinkOrBuilder() {
        if ((dataSinkCase_ == 4) && (gcsDataSinkBuilder_ != null)) {
          return gcsDataSinkBuilder_.getMessageOrBuilder();
        } else {
          if (dataSinkCase_ == 4) {
            return (com.google.storagetransfer.v1.proto.TransferTypes.GcsData) dataSink_;
          }
          return com.google.storagetransfer.v1.proto.TransferTypes.GcsData.getDefaultInstance();
        }
      }
<pre>
A Cloud Storage data sink.
</pre>

<code>.google.storagetransfer.v1.GcsData gcs_data_sink = 4;</code>
java-storage-transfer/proto-google-cloud-storage-transfer-v1/src/main/java/com/google/storagetransfer/v1/proto/TransferTypes.java