/// <summary>
 /// Not required for this implementation.
 /// </summary>
 /// <param name="translationUnits"></param>
 /// <param name="previousTranslationHashes"></param>
 /// <param name="settings"></param>
 /// <param name="mask"></param>
 /// <returns></returns>
 public ImportResult[] AddOrUpdateTranslationUnitsMasked(TranslationUnit[] translationUnits, int[] previousTranslationHashes, ImportSettings settings, bool[] mask)
 {
     ImportResult[] result = { AddTranslationUnit(translationUnits[translationUnits.GetLength(0) - 1], settings) };
     return result;
 }