/**
* Copyright (C) 2013 - present by OpenGamma Inc. and the OpenGamma group of companies
*
* Please see distribution for license.
*/
package com.opengamma.analytics.financial.interestrate.payments.provider;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import com.opengamma.analytics.financial.interestrate.payments.derivative.CouponONArithmeticAverage;
import com.opengamma.analytics.financial.provider.description.interestrate.MulticurveProviderInterface;
import com.opengamma.analytics.financial.provider.sensitivity.multicurve.ForwardSensitivity;
import com.opengamma.analytics.financial.provider.sensitivity.multicurve.MulticurveSensitivity;
import com.opengamma.analytics.financial.provider.sensitivity.multicurve.MultipleCurrencyMulticurveSensitivity;
import com.opengamma.analytics.financial.provider.sensitivity.multicurve.SimplyCompoundedForwardSensitivity;
import com.opengamma.util.ArgumentChecker;
import com.opengamma.util.money.MultipleCurrencyAmount;
import com.opengamma.util.tuple.DoublesPair;
/**
* Class describing the pricing of Fed Fund swap-like floating coupon (arithmetic average on overnight rates) by estimation and discounting (no convexity adjustment is computed).
* The estimation is done through an approximation.
* <p>Reference: Overnight Indexes Related Products. OpenGamma Documentation n. 20, Version 1.0, February 2013.
*/
public final class CouponONArithmeticAverageDiscountingApproxMethod {
/**
* The method unique instance.
*/
private static final CouponONArithmeticAverageDiscountingApproxMethod INSTANCE = new CouponONArithmeticAverageDiscountingApproxMethod();
/**
* Return the unique instance of the class.
* @return The instance.
*/
public static CouponONArithmeticAverageDiscountingApproxMethod getInstance() {
return INSTANCE;
}
/**
* Private constructor.
*/
private CouponONArithmeticAverageDiscountingApproxMethod() {
}
/**
* Computes the present value.
* @param coupon The coupon.
* @param multicurve The multi-curve provider.
* @return The present value.
*/
public MultipleCurrencyAmount presentValue(final CouponONArithmeticAverage coupon, final MulticurveProviderInterface multicurve) {
ArgumentChecker.notNull(coupon, "Coupon");
ArgumentChecker.notNull(multicurve, "Multi-curve provider");
final double[] startTimes = coupon.getFixingPeriodStartTimes();
final double[] endTimes = coupon.getFixingPeriodEndTimes();
final int nbFwd = endTimes.length - 1;
final double delta = coupon.getFixingPeriodRemainingAccrualFactor();
final double rateAccruedCompounded = multicurve.getSimplyCompoundForwardRate(coupon.getIndex(), startTimes[0], endTimes[nbFwd], delta) * delta;
final double rateAccrued = coupon.getRateAccrued() + Math.log(1.0 + rateAccruedCompounded);
final double df = multicurve.getDiscountFactor(coupon.getCurrency(), coupon.getPaymentTime());
final double pv = df * rateAccrued * coupon.getNotional();
return MultipleCurrencyAmount.of(coupon.getCurrency(), pv);
}
/**
* Computes the present value curve sensitivity.
* @param coupon The coupon.
* @param multicurve The multi-curve provider.
* @return The present value curve sensitivities.
*/
public MultipleCurrencyMulticurveSensitivity presentValueCurveSensitivity(final CouponONArithmeticAverage coupon, final MulticurveProviderInterface multicurve) {
ArgumentChecker.notNull(coupon, "Coupon");
ArgumentChecker.notNull(multicurve, "Multi-curve provider");
// Forward sweep
final double[] startTimes = coupon.getFixingPeriodStartTimes();
final double[] endTimes = coupon.getFixingPeriodEndTimes();
final int nbFwd = endTimes.length - 1;
final double delta = coupon.getFixingPeriodRemainingAccrualFactor();
final double forward = multicurve.getSimplyCompoundForwardRate(coupon.getIndex(), startTimes[0], endTimes[nbFwd], delta);
final double rateAccruedCompounded = forward * delta;
final double rateAccrued = coupon.getRateAccrued() + Math.log(1.0 + rateAccruedCompounded);
final double df = multicurve.getDiscountFactor(coupon.getCurrency(), coupon.getPaymentTime());
// Backward sweep
final double pvBar = 1.0;
final double dfBar = rateAccrued * coupon.getNotional() * pvBar;
final double rateAccruedBar = df * coupon.getNotional() * pvBar;
final double rateAccruedCompoundedBar = rateAccruedBar / (1.0 + rateAccruedCompounded);
final double forwardBar = delta * rateAccruedCompoundedBar;
final Map<String, List<DoublesPair>> mapDsc = new HashMap<>();
final List<DoublesPair> listDiscounting = new ArrayList<>();
listDiscounting.add(DoublesPair.of(coupon.getPaymentTime(), -coupon.getPaymentTime() * df * dfBar));
mapDsc.put(multicurve.getName(coupon.getCurrency()), listDiscounting);
final Map<String, List<ForwardSensitivity>> mapFwd = new HashMap<>();
final List<ForwardSensitivity> listForward = new ArrayList<>();
listForward.add(new SimplyCompoundedForwardSensitivity(startTimes[0], endTimes[nbFwd], delta, forwardBar));
mapFwd.put(multicurve.getName(coupon.getIndex()), listForward);
final MultipleCurrencyMulticurveSensitivity result = MultipleCurrencyMulticurveSensitivity.of(coupon.getCurrency(), MulticurveSensitivity.of(mapDsc, mapFwd));
return result;
}
}