private String doFindEquivalence(final String destinationNamespace,
final SkinnyUUID sourceUUID) {
JDBMEquivalenceLookup destinationLookup = openEquivalences
.get(destinationNamespace);
return destinationLookup.reverseLookup(sourceUUID);
}
private void openEquivalence(final String namespaceResourceLocation)
throws ResourceDownloadError, IndexingFailure, IOException {
// if we've opened an equivalence for this namespace, do nothing.