private byte[] negotiate(ExtendedNegotiation exneg, TransferCapability tc) {
if (exneg == null) return null;
StorageOptions storageOptions = tc.getStorageOptions();
if (storageOptions != null) return storageOptions.toExtendedNegotiationInformation();
EnumSet<QueryOption> queryOptions = tc.getQueryOptions();
if (queryOptions != null) {
EnumSet<QueryOption> commonOpts = QueryOption.toOptions(exneg);
commonOpts.retainAll(queryOptions);
return QueryOption.toExtendedNegotiationInformation(commonOpts);
}
return null;
}
