Review

class QueryParser {
  /** Parses a query string, returning a {@link org.apache.lucene.search.Query}.
   *  @param query  the query string to be parsed.
   *  @throws ParseException if the parsing fails
   */
  public Query parse(String query) throws ParseException {
    ReInit(new FastCharStream(new StringReader(query)));
    try {
          // TopLevelQuery is a Query followed by the end-of-input (EOF)
      Query res = TopLevelQuery(field);
      return res!=null ? res : new BooleanQuery();
    }
    catch (ParseException tme) {
      // rethrow to include the original query:
      throw new ParseException("Cannot parse '" +query+ "': " + tme.getMessage());
    }
    catch (TokenMgrError tme) {
      throw new ParseException("Cannot parse '" +query+ "': " + tme.getMessage());
    }
    catch (BooleanQuery.TooManyClauses tmc) {
      throw new ParseException("Cannot parse '" +query+ "': too many boolean clauses");
    }
  }

}