* @param sourceValue
* @return equivalent value, may be null.
*/
private String doFindEquivalence(final String sourceNamespace,
final String destinationNamespace, final String sourceValue) {
JDBMEquivalenceLookup sourceLookup =
openEquivalences.get(sourceNamespace);
if (sourceLookup == null) {
return null;
}
final SkinnyUUID sourceUUID = sourceLookup.lookup(sourceValue);
if (sourceUUID == null) {
return null;
}
return doFindEquivalence(destinationNamespace, sourceUUID);