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

<code>.google.storagetransfer.v1.MetadataOptions.GID gid = 3;</code>

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