fallbackiborindex.hpp

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/*
 Copyright (C) 2021 Quaternion Risk Management Ltd
 All rights reserved.
 
 This file is part of ORE, a free-software/open-source library
 for transparent pricing and risk analysis - http://opensourcerisk.org
 
 ORE is free software: you can redistribute it and/or modify it
 under the terms of the Modified BSD License.  You should have received a
 copy of the license along with this program.
 The license is also available online at <http://opensourcerisk.org>
 
 This program is distributed on the basis that it will form a useful
 contribution to risk analytics and model standardisation, but WITHOUT
 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 FITNESS FOR A PARTICULAR PURPOSE. See the license for more details.
*/
 
/*! \file qle/indexes/fallbackiborindex.hpp
    \brief wrapper class for ibor index managing the fallback rules
    \ingroup indexes
*/
 
#pragma once
 
#include <qle/cashflows/overnightindexedcoupon.hpp>
 
#include <ql/indexes/iborindex.hpp>
 
#include <vector>
 
namespace QuantExt {
using namespace QuantLib;
 
class FallbackIborIndex : public QuantLib::IborIndex {
public:
    FallbackIborIndex(const QuantLib::ext::shared_ptr<IborIndex> originalIndex,
                      const QuantLib::ext::shared_ptr<OvernightIndex> rfrIndex, const Real spread, const Date& switchDate,
                      const bool useRfrCurve);
    FallbackIborIndex(const QuantLib::ext::shared_ptr<IborIndex> originalIndex,
                      const QuantLib::ext::shared_ptr<OvernightIndex> rfrIndex, const Real spread, const Date& switchDate,
                      const Handle<YieldTermStructure>& forwardingCurve);
 
    void addFixing(const Date& fixingDate, Real fixing, bool forceOverwrite = false) override;
    Real fixing(const Date& fixingDate, bool forecastTodaysFixing = false) const override;
    Rate pastFixing(const Date& fixingDate) const override;
    QuantLib::ext::shared_ptr<IborIndex> clone(const Handle<YieldTermStructure>& forwarding) const override;
 
    QuantLib::ext::shared_ptr<IborIndex> originalIndex() const;
    QuantLib::ext::shared_ptr<OvernightIndex> rfrIndex() const;
    Real spread() const;
    const Date& switchDate() const;
 
    QuantLib::ext::shared_ptr<OvernightIndexedCoupon> onCoupon(const Date& iborFixingDate,
                                                       const bool telescopicValueDates = false) const;
 
private:
    Rate forecastFixing(const Date& valueDate, const Date& endDate, Time t) const override;
    QuantLib::ext::shared_ptr<IborIndex> originalIndex_;
    QuantLib::ext::shared_ptr<OvernightIndex> rfrIndex_;
    Real spread_;
    Date switchDate_;
};
 
} // namespace QuantExt