code: public static Long[] transformToLong(final String[] ids) {
      if (null == ids) return new Long[0];
      Long[] idsOfLong = new Long[ids.length];
      for (int i = 0; i < ids.length; i++) {
        idsOfLong[i] = new Long(ids[i]);
      }
      return idsOfLong;
    }
docs: transformToLong.
  
  @param ids an array of {@link java.lang.String} objects.
  @return an array of {@link java.lang.Long} objects. If ids is null, return Long[0]