code: private static boolean isDelimiter(final char ch, final char[] delimiters) {
          if (delimiters == null) {
              return CharUtils.isWhitespace(ch);
          }
          for (final char delimiter : delimiters) {
              if (ch == delimiter) {
                  return true;
              }
          }
          return false;
      }
docs: Is the character a delimiter.
  
  @param ch  the character to check
  @param delimiters  the delimiters
  @return true if it is a delimiter