speedcalculator.h

//------------------------------------------------------------------------------
// speedcalculator.h
//------------------------------------------------------------------------------
//
// This library is free software; you can redistribute it and/or
// modify it under the terms of the GNU Lesser General Public
// License as published by the Free Software Foundation; either
// version 2.1 of the License, or (at your option) any later version.
//
// This library 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 GNU
// Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public
// License along with this library; if not, write to the Free Software
// Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
// 02110-1301  USA
//
//------------------------------------------------------------------------------
// Copyright (C) 2010 "Zalewa" <zalewapl@gmail.com>
//------------------------------------------------------------------------------
#ifndef __SPEEDCALCULATOR_H__
#define __SPEEDCALCULATOR_H__

#include <QTime>
#include <QVector>

class SpeedCalculator
{
public:
        SpeedCalculator();

        long double estimatedTimeUntilArrival() const;

        qint64 expectedDataSize() const { return dataSizeExpected; }

        long double getSpeed() const;

        qint64 lastRegisteredDataAmount() const;

        qint64 lastRegisterAttemptedDataAmount() const
        {
                return lastRegisterAttemptDataSize;
        }

        void registerDataAmount(qint64 totalAmountOfArrivedData);

        void setExpectedDataSize(qint64 size);

        void start();

private:
        class DataArrivalInfo
        {
        public:
                qint64 totalAmountOfArrivedData;

                qint64 timeOfArrival;

                DataArrivalInfo()
                {
                        this->totalAmountOfArrivedData = 0;
                        this->timeOfArrival = 0;
                }

                DataArrivalInfo(qint64 totalAmountOfArrivedData, qint64 timeOfArrival)
                {
                        this->totalAmountOfArrivedData = totalAmountOfArrivedData;
                        this->timeOfArrival = timeOfArrival;
                }
        };

        static const int NUM_ARRIVAL_DATA = 2;

        QVector<DataArrivalInfo> arrivalData;

        QTime clock;
        qint64 dataSizeExpected;

        qint64 lastRegisterAttemptDataSize;
};

#endif