code: public void addPattern(String pattern, String ivalue) {
          int k = ivalues.find(ivalue);
          if (k <= 0) {
              k = packValues(ivalue);
              ivalues.insert(ivalue, (char)k);
          }
          insert(pattern, (char)k);
      }
docs: Add a pattern to the tree. Mainly, to be used by
  {@link SimplePatternParser SimplePatternParser} class as callback to
  add a pattern to the tree.
  @param pattern the hyphenation pattern
  @param ivalue interletter weight values indicating the
  desirability and priority of hyphenating at a given point
  within the pattern. It should contain only digit characters.
  (i.e. '0' to '9').