private void validateConverter(
     final List<PatternFormatter> formatter, final int index, final String name) {
   final PatternConverter pc = formatter.get(index).getConverter();
   assertEquals(
       "Incorrect converter " + pc.getName() + " at index " + index + " expected " + name,
       pc.getName(),
       name);
 }
 private void addToList(PatternConverter pc) {
   if (head == null) {
     head = tail = pc;
   } else {
     tail.next = pc;
     tail = pc;
   }
 }