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/* -*- mode: c++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */

 Copyright (C) 2000-2004 StatPro Italia srl

 This file is part of QuantLib, a free-software/open-source library
 for financial quantitative analysts and developers - http://quantlib.org/

 QuantLib is free software: you can redistribute it and/or modify it
 under the terms of the QuantLib license.  You should have received a
 copy of the license along with this program; if not, please email
 <quantlib-dev@lists.sf.net>. The license is also available online at

 This program is distributed in the hope that it will be useful, but WITHOUT
 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
 FOR A PARTICULAR PURPOSE.  See the license for more details.

/*! \file swaptionvolstructure.hpp
    \brief Swaption volatility structure

#ifndef quantlib_swaption_volatility_structure_hpp
#define quantlib_swaption_volatility_structure_hpp

#include <ql/termstructure.hpp>

namespace QuantLib {

    //! %Swaption-volatility structure
    /*! This class is purely abstract and defines the interface of concrete
        swaption volatility structures which will be derived from this one.
00035     class SwaptionVolatilityStructure : public TermStructure {
        /*! \name Constructors
            See the TermStructure documentation for issues regarding
        //! default constructor
        /*! \warning term structures initialized by means of this
                     constructor must manage their own reference date
                     by overriding the referenceDate() method.
        //! initialize with a fixed reference date
        SwaptionVolatilityStructure(const Date& referenceDate);
        //! calculate the reference date based on the global evaluation date
        SwaptionVolatilityStructure(Integer settlementDays, const Calendar&);
        virtual ~SwaptionVolatilityStructure() {}
        //! \name Volatility
        //! returns the volatility for a given starting date and length
        Volatility volatility(const Date& start, const Period& length,
                              Rate strike) const;
        //! returns the volatility for a given starting time and length
        Volatility volatility(Time start, Time length, Rate strike) const;
        //! implements the actual volatility calculation in derived classes
        virtual Volatility volatilityImpl(Time start, Time length,
                                          Rate strike) const = 0;
        //! implements the conversion between dates and times
        virtual std::pair<Time,Time> convertDates(const Date& start,
                                                  const Period& length) const;

    // inline definitions

00074     inline SwaptionVolatilityStructure::SwaptionVolatilityStructure() {}

00076     inline SwaptionVolatilityStructure::SwaptionVolatilityStructure(
                                                   const Date& referenceDate)
    : TermStructure(referenceDate) {}

00080     inline SwaptionVolatilityStructure::SwaptionVolatilityStructure(
                             Integer settlementDays, const Calendar& calendar)
    : TermStructure(settlementDays,calendar) {}

00084     inline Volatility SwaptionVolatilityStructure::volatility(
                                                        const Date& start,
                                                        const Period& length,
                                                        Rate strike) const {
        std::pair<Time,Time> times = convertDates(start,length);
        return volatilityImpl(times.first,times.second,strike);

00092     inline Volatility SwaptionVolatilityStructure::volatility(Time start,
                                                              Time length,
                                                              Rate strike)
                                                                     const {
        return volatilityImpl(start,length,strike);

    inline std::pair<Time,Time>
00100     SwaptionVolatilityStructure::convertDates(const Date& start,
                                              const Period& length) const {
        Time startTime = timeFromReference(start);
        Date end = start + length;
        Time timeLength = dayCounter().yearFraction(start,end);
        return std::make_pair(startTime,timeLength);



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