@java.lang.Override
    public int getUidValue() {
      return uid_;
    }
<pre>
Specifies how each file's POSIX user ID (UID) attribute should be handled
by the transfer. By default, UID is not preserved. Only applicable to
transfers involving POSIX file systems, and ignored for other transfers.
</pre>

<code>.google.storagetransfer.v1.MetadataOptions.UID uid = 4;</code>

@return The enum numeric value on the wire for uid.
java-storage-transfer/proto-google-cloud-storage-transfer-v1/src/main/java/com/google/storagetransfer/v1/proto/TransferTypes.java