public Builder setPosixDataSink(
          com.google.storagetransfer.v1.proto.TransferTypes.PosixFilesystem.Builder
              builderForValue) {
        if (posixDataSinkBuilder_ == null) {
          dataSink_ = builderForValue.build();
          onChanged();
        } else {
          posixDataSinkBuilder_.setMessage(builderForValue.build());
        }
        dataSinkCase_ = 13;
        return this;
      }
<pre>
A POSIX Filesystem data sink.
</pre>

<code>.google.storagetransfer.v1.PosixFilesystem posix_data_sink = 13;</code>
java-storage-transfer/proto-google-cloud-storage-transfer-v1/src/main/java/com/google/storagetransfer/v1/proto/TransferTypes.java