class BloombergCommodityFutureOptionVolatilitySurfaceInstrumentProvider extends BloombergFutureOptionVolatilitySurfaceInstrumentProvider {

  @Override
  public ExternalId getInstrument(final Number futureOptionNumber, final Double strike, final LocalDate surfaceDate) {
    ArgumentChecker.notNull(futureOptionNumber, "futureOptionNumber");
    ArgumentChecker.notNull(strike, "strike");
    ArgumentChecker.notNull(surfaceDate, "surface date");
    final String prefix = getFutureOptionPrefix();
    final StringBuffer ticker = new StringBuffer();
    ticker.append(prefix);
    final ExchangeTradedInstrumentExpiryCalculator expiryRule = getExpiryRuleCalculator();
    final LocalDate expiryDate = expiryRule.getExpiryMonth(futureOptionNumber.intValue(), surfaceDate);
    final String expiryCode = BloombergFutureUtils.getShortExpiryCode(expiryDate);
    ticker.append(expiryCode);
    ticker.append(strike > useCallAboveStrike() ? "C" : "P");
    ticker.append(" ");
    // temp workaround for BZA which has 2 decimal places - need to find the proper rule.
    //if (prefix.equals("BZA")) {
    //  ticker.append(withTwoDigits.format(strike));
    //} else {
      ticker.append(strike);
    //}
    ticker.append(" ");
    ticker.append(getPostfix());
    return ExternalId.of(getScheme(), ticker.toString());
  }

  public  BloombergCommodityFutureOptionVolatilitySurfaceInstrumentProvider(final String futureOptionPrefix, final String postfix, final String dataFieldName, final Double useCallAboveStrike,
      final String exchangeIdName);
  public  BloombergCommodityFutureOptionVolatilitySurfaceInstrumentProvider(final String futureOptionPrefix, final String postfix, final String dataFieldName, final Double useCallAboveStrike,
      final String exchangeIdName, final String schemeName);

}