docs: @Override
  	public SortedSet<String> getAttributeSortedStringSet(String name) {
  		try {
  			TreeSet<String> attrSet = new TreeSet<String>();
  			LdapUtils.collectAttributeValues(originalAttrs, name, attrSet, String.class);
  			return attrSet;
  		}
  		catch (NoSuchAttributeException e) {
  			// The attribute does not exist - contract says to return null.
  			return null;
  		}
  	}