/**
  * Calculates the price sensitivity of the bond future product.
  *
  * <p>The price sensitivity of the product is the sensitivity of the price to the underlying
  * curves.
  *
  * <p>Note that the price sensitivity should be no currency.
  *
  * @param future the future to price
  * @param provider the rates provider
  * @return the price curve sensitivity of the product
  */
 public PointSensitivities priceSensitivity(
     BondFuture future, LegalEntityDiscountingProvider provider) {
   ImmutableList<Security<FixedCouponBond>> bondSecurity = future.getBondSecurityBasket();
   int size = bondSecurity.size();
   double[] priceBonds = new double[size];
   int indexCTD = 0;
   double priceMin = 2d;
   for (int i = 0; i < size; i++) {
     Security<FixedCouponBond> bond = bondSecurity.get(i);
     double dirtyPrice =
         bondPricer.dirtyPriceFromCurves(bond, provider, future.getLastDeliveryDate());
     priceBonds[i] =
         bondPricer.cleanPriceFromDirtyPrice(
                 bond.getProduct(), future.getLastDeliveryDate(), dirtyPrice)
             / future.getConversionFactor().get(i);
     if (priceBonds[i] < priceMin) {
       priceMin = priceBonds[i];
       indexCTD = i;
     }
   }
   PointSensitivityBuilder pointSensi =
       bondPricer.dirtyPriceSensitivity(
           bondSecurity.get(indexCTD), provider, future.getLastDeliveryDate());
   return pointSensi.multipliedBy(1d / future.getConversionFactor().get(indexCTD)).build();
 }
  /**
   * Calculates the price of the bond future product with z-spread.
   *
   * <p>The price of the product is the price on the valuation date.
   *
   * <p>The z-spread is a parallel shift applied to continuously compounded rates or periodic
   * compounded rates of the issuer discounting curve.
   *
   * @param future the future to price
   * @param provider the rates provider
   * @param zSpread the z-spread
   * @param compoundedRateType the compounded rate type
   * @param periodPerYear the number of periods per year
   * @return the price of the product, in decimal form
   */
  public double priceWithZSpread(
      BondFuture future,
      LegalEntityDiscountingProvider provider,
      double zSpread,
      CompoundedRateType compoundedRateType,
      int periodPerYear) {

    ImmutableList<Security<FixedCouponBond>> bondSecurity = future.getBondSecurityBasket();
    int size = bondSecurity.size();
    double[] priceBonds = new double[size];
    for (int i = 0; i < size; ++i) {
      Security<FixedCouponBond> bond = bondSecurity.get(i);
      double dirtyPrice =
          bondPricer.dirtyPriceFromCurvesWithZSpread(
              bond,
              provider,
              zSpread,
              compoundedRateType,
              periodPerYear,
              future.getLastDeliveryDate());
      priceBonds[i] =
          bondPricer.cleanPriceFromDirtyPrice(
                  bond.getProduct(), future.getLastDeliveryDate(), dirtyPrice)
              / future.getConversionFactor().get(i);
    }
    return Doubles.min(priceBonds);
  }