public override double swapletRate()
{
OvernightIndex index = coupon_.index() as OvernightIndex;
List <Date> fixingDates = coupon_.fixingDates();
List <double> dt = coupon_.dt();
int n = dt.Count;
int i = 0;
double compoundFactor = 1.0;
// already fixed part
Date today = Settings.evaluationDate();
while (fixingDates[i] < today && i < n)
{
// rate must have been fixed
double?pastFixing = IndexManager.instance().getHistory(index.name()).value()[fixingDates[i]];
Utils.QL_REQUIRE(pastFixing != null, () => "Missing " + index.name() + " fixing for " + fixingDates[i].ToString());
compoundFactor *= (1.0 + pastFixing.GetValueOrDefault() * dt[i]);
++i;
}
// today is a border case
if (fixingDates[i] == today && i < n)
{
// might have been fixed
try
{
double?pastFixing = IndexManager.instance().getHistory(index.name()).value()[fixingDates[i]];
if (pastFixing != null)
{
compoundFactor *= (1.0 + pastFixing.GetValueOrDefault() * dt[i]);
++i;
}
else
{
// fall through and forecast
}
}
catch (Exception)
{
// fall through and forecast
}
}
// forward part using telescopic property in order
// to avoid the evaluation of multiple forward fixings
if (i < n)
{
Handle <YieldTermStructure> curve = index.forwardingTermStructure();
Utils.QL_REQUIRE(!curve.empty(), () => "null term structure set to this instance of" + index.name());
List <Date> dates = coupon_.valueDates();
double startDiscount = curve.link.discount(dates[i]);
double endDiscount = curve.link.discount(dates[n]);
compoundFactor *= startDiscount / endDiscount;
}
double rate = (compoundFactor - 1.0) / coupon_.accrualPeriod();
return(coupon_.gearing() * rate + coupon_.spread());
}
public override double fixing(Date fixingDate, bool forecastTodaysFixing)
{
Date today = Settings.evaluationDate();
Date todayMinusLag = today - availabilityLag_;
KeyValuePair <Date, Date> limm = Utils.inflationPeriod(todayMinusLag, frequency_);
Date lastFix = limm.Key - 1;
Date flatMustForecastOn = lastFix + 1;
Date interpMustForecastOn = lastFix + 1 - new Period(frequency_);
if (interpolated() && fixingDate >= interpMustForecastOn)
{
return(forecastFixing(fixingDate));
}
if (!interpolated() && fixingDate >= flatMustForecastOn)
{
return(forecastFixing(fixingDate));
}
// four cases with ratio() and interpolated()
if (ratio())
{
if (interpolated())
{
// IS ratio, IS interpolated
KeyValuePair <Date, Date> lim = Utils.inflationPeriod(fixingDate, frequency_);
Date fixMinus1Y = new NullCalendar().advance(fixingDate, new Period(-1, TimeUnit.Years), BusinessDayConvention.ModifiedFollowing);
KeyValuePair <Date, Date> limBef = Utils.inflationPeriod(fixMinus1Y, frequency_);
double dp = lim.Value + 1 - lim.Key;
double dpBef = limBef.Value + 1 - limBef.Key;
double dl = fixingDate - lim.Key;
// potentially does not work on 29th Feb
double dlBef = fixMinus1Y - limBef.Key;
// get the four relevant fixings
// recall that they are stored flat for every day
double?limFirstFix =
IndexManager.instance().getHistory(name()).value()[lim.Key];
if (limFirstFix == null)
{
throw new ApplicationException("Missing " + name() + " fixing for "
+ lim.Key);
}
double?limSecondFix =
IndexManager.instance().getHistory(name()).value()[lim.Value + 1];
if (limSecondFix == null)
{
throw new ApplicationException("Missing " + name() + " fixing for "
+ lim.Value + 1);
}
double?limBefFirstFix =
IndexManager.instance().getHistory(name()).value()[limBef.Key];
if (limBefFirstFix == null)
{
throw new ApplicationException("Missing " + name() + " fixing for "
+ limBef.Key);
}
double?limBefSecondFix =
IndexManager.instance().getHistory(name()).value()[limBef.Value + 1];
if (limBefSecondFix == null)
{
throw new ApplicationException("Missing " + name() + " fixing for "
+ limBef.Value + 1);
}
double linearNow = limFirstFix.Value + (limSecondFix.Value - limFirstFix.Value) * dl / dp;
double linearBef = limBefFirstFix.Value + (limBefSecondFix.Value - limBefFirstFix.Value) * dlBef / dpBef;
double wasYES = linearNow / linearBef - 1.0;
return(wasYES);
}
else
{
// IS ratio, NOT interpolated
double?pastFixing =
IndexManager.instance().getHistory(name()).value()[fixingDate];
if (pastFixing == null)
{
throw new ApplicationException("Missing " + name() + " fixing for "
+ fixingDate);
}
Date previousDate = fixingDate - new Period(1, TimeUnit.Years);
double?previousFixing =
IndexManager.instance().getHistory(name()).value()[previousDate];
if (previousFixing == null)
{
throw new ApplicationException("Missing " + name() + " fixing for "
+ previousDate);
}
return(pastFixing.Value / previousFixing.Value - 1.0);
}
}
else
{
// NOT ratio
if (interpolated())
{
// NOT ratio, IS interpolated
KeyValuePair <Date, Date> lim = Utils.inflationPeriod(fixingDate, frequency_);
double dp = lim.Value + 1 - lim.Key;
double dl = fixingDate - lim.Key;
double?limFirstFix =
IndexManager.instance().getHistory(name()).value()[lim.Key];
if (limFirstFix == null)
{
throw new ApplicationException("Missing " + name() + " fixing for "
+ lim.Key);
}
double?limSecondFix =
IndexManager.instance().getHistory(name()).value()[lim.Value + 1];
if (limSecondFix == null)
{
throw new ApplicationException("Missing " + name() + " fixing for "
+ lim.Value + 1);
}
double linearNow = limFirstFix.Value + (limSecondFix.Value - limFirstFix.Value) * dl / dp;
return(linearNow);
}
else
{
// NOT ratio, NOT interpolated
// so just flat
double?pastFixing =
IndexManager.instance().getHistory(name()).value()[fixingDate];
if (pastFixing == null)
{
throw new ApplicationException("Missing " + name() + " fixing for "
+ fixingDate);
}
return(pastFixing.Value);
}
}
// QL_FAIL("YoYInflationIndex::fixing, should never get here");
}
//! clears all stored historical fixings
public void clearFixings()
{
IndexManager.instance().clearHistory(name());
}
//! returns the fixing TimeSeries
public ObservableValue <TimeSeries <double> > timeSeries()
{
return(IndexManager.instance().getHistory(name()));
}
//! Implemented in order to manage the case of par coupon
public override double indexFixing()
{
#if QL_USE_INDEXED_COUPON
return(index_.fixing(fixingDate()));
#else
if (isInArrears())
{
return(index_.fixing(fixingDate()));
}
else
{
Date today = Settings.evaluationDate();
Date fixingDate = this.fixingDate();
TimeSeries <double> fixings = IndexManager.instance().getHistory(index_.name()).value();
if (fixings.ContainsKey(fixingDate))
{
return(fixings[fixingDate]);
}
else
{
if (fixingDate < today)
{
// must have been fixed
if (IndexManager.MissingPastFixingCallBack == null)
{
throw new ArgumentException("Missing " + index_.name() + " fixing for " + fixingDate);
}
else
{
// try to load missing fixing from external source
double fixing = IndexManager.MissingPastFixingCallBack(index_, fixingDate);
// add to history
index_.addFixing(fixingDate, fixing);
return(fixing);
}
}
if (fixingDate == today)
{
// might have been fixed
// fall through and forecast
}
}
// forecast: 0) forecasting curve
Handle <YieldTermStructure> termStructure = iborIndex_.forwardingTermStructure();
if (termStructure.empty())
{
throw new ApplicationException("null term structure set to this instance of " +
index_.name());
}
// forecast: 1) startDiscount
Date fixingValueDate = index_.fixingCalendar().advance(fixingDate, index_.fixingDays(), TimeUnit.Days);
double startDiscount = termStructure.link.discount(fixingValueDate);
// forecast: 2) endDiscount
Date nextFixingDate = index_.fixingCalendar().advance(accrualEndDate_, -fixingDays, TimeUnit.Days);
Date nextFixingValueDate = index_.fixingCalendar().advance(nextFixingDate, index_.fixingDays(), TimeUnit.Days);
double endDiscount = termStructure.link.discount(nextFixingValueDate);
// forecast: 3) spanningTime
double spanningTime = index_.dayCounter().yearFraction(fixingValueDate, nextFixingValueDate);
if (!(spanningTime > 0.0))
{
throw new ApplicationException("cannot calculate forward rate between " +
fixingValueDate + " and " + nextFixingValueDate +
": non positive time using " + index_.dayCounter().name());
}
// forecast: 4) implied fixing
return((startDiscount / endDiscount - 1.0) / spanningTime);
}
#endif
}
// Clears all stored historical fixings
public void clearFixings()
{
checkNativeFixingsAllowed();
IndexManager.instance().clearHistory(name());
}
// Returns the fixing TimeSeries
public TimeSeries <double?> timeSeries()
{
return(IndexManager.instance().getHistory(name()));
}