docs: public boolean containsValue(Token value,
                                   Transaction transaction)
                      throws ObjectManagerException
      {
          try {
              for (Iterator iterator = entrySet().iterator();;) {
                  Entry entry = (Entry) iterator.next(transaction);
                  Token entryValue = entry.getValue();
                  if (value == entryValue) {
                      return true;
                  }
              }
          } catch (java.util.NoSuchElementException exception) {
              // No FFDC code needed, just exited search.
              return false;
          } // try.
  
      }