dynamiccpivolatilitystructure.hpp

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/*
Copyright (C) 2019 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/termstructures/dynamiccpivolatilitystructure.hpp
\brief dynamic zero inflation volatility structure
\ingroup termstructures
*/
 
#pragma once
 
#include <boost/make_shared.hpp>
#include <ql/termstructures/volatility/inflation/cpivolatilitystructure.hpp>
#include <ql/termstructures/volatility/smilesection.hpp>
#include <qle/termstructures/dynamicstype.hpp>
#include <qle/termstructures/interpolatedcpivolatilitysurface.hpp>
 
namespace QuantExt {
using namespace QuantLib;
 
//! Converts a CPIVolatilityStructure with fixed reference date into a floating reference date term structure.
/*! Different ways of reacting to time decay can be specified.
 
\ingroup termstructures
*/
 
class DynamicCPIVolatilitySurface : public CPIVolatilitySurface {
public:
    DynamicCPIVolatilitySurface(const QuantLib::ext::shared_ptr<CPIVolatilitySurface>& source,
                                ReactionToTimeDecay decayMode = ConstantVariance);
 
protected:
    //! \name CPIVolatilitySurface interface
    //@{
    Volatility volatilityImpl(Time length, Rate strike) const override;
    //@}
 
    //! \name VolatilityTermStructure interface
    //@{
    Rate minStrike() const override;
    Rate maxStrike() const override;
    //@}
 
    //! \name VolatilityTermStructure interface
    //@{
    Date maxDate() const override;
    //@}
 
    //! \name Observer interface
    //@{
    void update() override;
    //@}
 
private:
    const QuantLib::ext::shared_ptr<CPIVolatilitySurface> source_;
    ReactionToTimeDecay decayMode_;
    const Date originalReferenceDate_;
};
 
} // namespace QuantExt