/*

 *

 *  Copyright (C) 1999-2012, OFFIS e.V.

 *  All rights reserved.  See COPYRIGHT file for details.

 *

 *  This software and supporting documentation were developed by

 *

 *    OFFIS e.V.

 *    R&D Division Health

 *    Escherweg 2

 *    D-26121 Oldenburg, Germany

 *

 *

 *  Module:  ofstd

 *

 *  Author:  Joerg Riesmeier

 *

 *  Purpose: Class for measurement of time (Source)

 *

 */

#include "dcmtk/config/osconfig.h"

#include "dcmtk/ofstd/oftimer.h"

#include "dcmtk/ofstd/ofcast.h"

#ifdef HAVE_WINDOWS_H

#define WIN32_LEAN_AND_MEAN

#include <windows.h>

#else /* UNIX */

#include <sys/time.h>

#endif

/*------------------*

 *  implementation  *

 *------------------*/

OFTimer::OFTimer()

  : Start(getTime())

{

}

void OFTimer::reset()

{

    Start = getTime();

}

double OFTimer::getDiff() const

{

    return getTime() - Start;

}

double OFTimer::getDiff(double start)

{

    return getTime() - start;

}

double OFTimer::getTime()

{

#ifdef HAVE_WINDOWS_H

    // according to MSDN: "The resolution of the GetTickCount function is limited to the resolution

    // of the system timer, which is typically in the range of 10 milliseconds to 16 milliseconds."

    return OFstatic_cast(double, GetTickCount()) / 1000;

#else

    timeval c_time;

    gettimeofday(&c_time, NULL);

    return OFstatic_cast(double, c_time.tv_sec) + OFstatic_cast(double, c_time.tv_usec) / 1000000;

#endif

}

STD_NAMESPACE ostream &operator<<(STD_NAMESPACE ostream &stream, const OFTimer &timer)

{

    const double timeDiff = timer.getDiff();

    // output time difference in units depending on the value range

    if ((timeDiff < 1) && (timeDiff > -1))

        stream << (timeDiff * 1000) << " ms";

    else if ((timeDiff < 60) && (timeDiff > -60))

        stream << timeDiff << " s";

    else if ((timeDiff < 3600) && (timeDiff > -3600))

        stream << (timeDiff / 60) << " min";

    else

        stream << (timeDiff / 3600) << " h";

    return stream;

}