cashrebate.cpp

/* -*- mode: c++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
 
/*
 Copyright (C) 2006 Mark Joshi
 
 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
 <http://quantlib.org/license.shtml>.
 
 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.
*/
 
#include <ql/models/marketmodels/products/multistep/cashrebate.hpp>
#include <ql/models/marketmodels/utilities.hpp>
#include <utility>
 
namespace QuantLib {
 
    MarketModelCashRebate::MarketModelCashRebate(EvolutionDescription evolution,
                                                 const std::vector<Time>& paymentTimes,
                                                 Matrix amounts,
                                                 Size numberOfProducts)
    : evolution_(std::move(evolution)), paymentTimes_(paymentTimes), amounts_(std::move(amounts)),
      numberOfProducts_(numberOfProducts) {
 
        checkIncreasingTimes(paymentTimes);
 
        QL_REQUIRE(amounts_.rows() == numberOfProducts_,
                   "the number of rows in the matrix must equal "
                   "the number of products");
        QL_REQUIRE(amounts_.columns() == paymentTimes_.size(),
                   "the number of columns in the matrix must equal "
                   "the number of payment times");
        QL_REQUIRE(evolution_.evolutionTimes().size() == paymentTimes_.size(),
                   "the number of evolution times must equal "
                   "the number of payment times");
    }
 
 
    std::vector<Time>
    MarketModelCashRebate::possibleCashFlowTimes() const 
    {
        return paymentTimes_;
    }
 
    Size MarketModelCashRebate::numberOfProducts() const 
    {
        return numberOfProducts_;
    }
 
    Size MarketModelCashRebate::maxNumberOfCashFlowsPerProductPerStep() const 
    {
        return 1;
    }
 
    void MarketModelCashRebate::reset() 
    {
       currentIndex_=0;
    }
 
    std::vector<Size>
    MarketModelCashRebate::suggestedNumeraires() const 
    {
        QL_FAIL("not implemented (yet?)");
    }
 
    const EvolutionDescription& MarketModelCashRebate::evolution() const
    {
        return evolution_;
    }
 
 
    bool MarketModelCashRebate::nextTimeStep(
            const CurveState&,
            std::vector<Size>& numberCashFlowsThisStep,
            std::vector<std::vector<MarketModelMultiProduct::CashFlow> >&
                                                               genCashFlows)
    {
        for (Size i=0; i<numberOfProducts_; ++i) 
        {
            numberCashFlowsThisStep[i] = 1;
            genCashFlows[i][0].timeIndex = currentIndex_;
            genCashFlows[i][0].amount = amounts_[i][currentIndex_];
        }
        ++currentIndex_;
        return true;
    }
 
    std::unique_ptr<MarketModelMultiProduct>
    MarketModelCashRebate::clone() const 
    {
        return std::unique_ptr<MarketModelMultiProduct>(new MarketModelCashRebate(*this));
    }
 
}