@Override
 public Optional<Currency> defaultReportingCurrency(FxSwapTrade target) {
   Currency base = target.getProduct().getNearLeg().getBaseCurrencyAmount().getCurrency();
   Currency counter = target.getProduct().getNearLeg().getCounterCurrencyAmount().getCurrency();
   CurrencyPair marketConventionPair = CurrencyPair.of(base, counter).toConventional();
   return Optional.of(marketConventionPair.getBase());
 }
  private void calibration_market_quote_sensitivity_check(
      Function<MarketData, ImmutableRatesProvider> calibrator, double shift) {

    double notional = 100_000_000.0;
    double fx = 1.1111;
    double fxPts = 0.0012;
    FxSwapTrade trade =
        EUR_USD.toTrade(
            VAL_DATE, Period.ofWeeks(6), Period.ofMonths(5), BuySell.BUY, notional, fx, fxPts);
    ImmutableRatesProvider result =
        CALIBRATOR.calibrate(CURVE_GROUP_CONFIG, VAL_DATE, ALL_QUOTES, TS);
    PointSensitivities pts = FX_PRICER.presentValueSensitivity(trade.getProduct(), result);
    CurveCurrencyParameterSensitivities ps = result.curveParameterSensitivity(pts);
    CurveCurrencyParameterSensitivities mqs = MQC.sensitivity(ps, result);
    double pvUsd = FX_PRICER.presentValue(trade.getProduct(), result).getAmount(USD).getAmount();
    double pvEur = FX_PRICER.presentValue(trade.getProduct(), result).getAmount(EUR).getAmount();
    double[] mqsUsd1Computed =
        mqs.getSensitivity(USD_DSCON_CURVE_NAME, USD).getSensitivity().toArray();
    for (int i = 0; i < USD_DSC_NB_NODES; i++) {
      Map<MarketDataKey<?>, Object> map = new HashMap<>(ALL_QUOTES.getValues());
      map.put(
          QuoteKey.of(StandardId.of(SCHEME, USD_DSC_ID_VALUE[i])),
          USD_DSC_MARKET_QUOTES[i] + shift);
      ImmutableMarketData marketData = ImmutableMarketData.of(map);
      ImmutableRatesProvider rpShifted = calibrator.apply(marketData);
      double pvS = FX_PRICER.presentValue(trade.getProduct(), rpShifted).getAmount(USD).getAmount();
      assertEquals(mqsUsd1Computed[i], (pvS - pvUsd) / shift, TOLERANCE_PV_DELTA);
    }
    double[] mqsUsd2Computed =
        mqs.getSensitivity(USD_DSCON_CURVE_NAME, EUR).getSensitivity().toArray();
    for (int i = 0; i < USD_DSC_NB_NODES; i++) {
      Map<MarketDataKey<?>, Object> map = new HashMap<>(ALL_QUOTES.getValues());
      map.put(
          QuoteKey.of(StandardId.of(SCHEME, USD_DSC_ID_VALUE[i])),
          USD_DSC_MARKET_QUOTES[i] + shift);
      ImmutableMarketData ov = ImmutableMarketData.of(map);
      ImmutableRatesProvider rpShifted = calibrator.apply(ov);
      double pvS = FX_PRICER.presentValue(trade.getProduct(), rpShifted).getAmount(EUR).getAmount();
      assertEquals(mqsUsd2Computed[i], (pvS - pvEur) / shift, TOLERANCE_PV_DELTA);
    }
    double[] mqsEur1Computed =
        mqs.getSensitivity(EUR_DSC_CURVE_NAME, USD).getSensitivity().toArray();
    for (int i = 0; i < EUR_DSC_NB_NODES; i++) {
      assertEquals(mqsEur1Computed[i], 0.0, TOLERANCE_PV_DELTA);
    }
    double[] mqsEur2Computed =
        mqs.getSensitivity(EUR_DSC_CURVE_NAME, EUR).getSensitivity().toArray();
    for (int i = 0; i < EUR_DSC_NB_NODES; i++) {
      Map<MarketDataKey<?>, Object> map = new HashMap<>(ALL_QUOTES.getValues());
      map.put(
          QuoteKey.of(StandardId.of(SCHEME, EUR_DSC_ID_VALUE[i])),
          EUR_DSC_MARKET_QUOTES[i] + shift);
      ImmutableMarketData marketData = ImmutableMarketData.of(map);
      ImmutableRatesProvider rpShifted = calibrator.apply(marketData);
      double pvS = FX_PRICER.presentValue(trade.getProduct(), rpShifted).getAmount(EUR).getAmount();
      assertEquals(mqsEur2Computed[i], (pvS - pvEur) / shift, TOLERANCE_PV_DELTA, "Node " + i);
    }
  }
 @Override
 public ScenarioResult<T> execute(FxSwapTrade trade, CalculationMarketData marketData) {
   ExpandedFxSwap product = trade.getProduct().expand();
   return IntStream.range(0, marketData.getScenarioCount())
       .mapToObj(index -> new SingleCalculationMarketData(marketData, index))
       .map(MarketDataRatesProvider::new)
       .map(provider -> execute(product, provider))
       .collect(toScenarioResult(isConvertCurrencies()));
 }
  @Override
  public FunctionRequirements requirements(FxSwapTrade trade) {
    FxSwap fx = trade.getProduct();
    Currency baseCurrency = fx.getNearLeg().getBaseCurrencyAmount().getCurrency();
    Currency counterCurrency = fx.getNearLeg().getCounterCurrencyAmount().getCurrency();

    Set<DiscountFactorsKey> discountCurveKeys =
        ImmutableSet.of(
            DiscountFactorsKey.of(baseCurrency), DiscountFactorsKey.of(counterCurrency));

    return FunctionRequirements.builder()
        .singleValueRequirements(discountCurveKeys)
        .timeSeriesRequirements()
        .outputCurrencies(baseCurrency, counterCurrency)
        .build();
  }