stop_watch.h

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/** @file
 *  @author Bram de Greve (bramz@users.sourceforge.net)
 *  @author Tom De Muer (tomdemuer@users.sourceforge.net)
 *
 *  *** BEGIN LICENSE INFORMATION ***
 *  
 *  The contents of this file are subject to the Common Public Attribution License 
 *  Version 1.0 (the "License"); you may not use this file except in compliance with 
 *  the License. You may obtain a copy of the License at 
 *  http://lass.sourceforge.net/cpal-license. The License is based on the 
 *  Mozilla Public License Version 1.1 but Sections 14 and 15 have been added to cover 
 *  use of software over a computer network and provide for limited attribution for 
 *  the Original Developer. In addition, Exhibit A has been modified to be consistent 
 *  with Exhibit B.
 *  
 *  Software distributed under the License is distributed on an "AS IS" basis, WITHOUT 
 *  WARRANTY OF ANY KIND, either express or implied. See the License for the specific 
 *  language governing rights and limitations under the License.
 *  
 *  The Original Code is LASS - Library of Assembled Shared Sources.
 *  
 *  The Initial Developer of the Original Code is Bram de Greve and Tom De Muer.
 *  The Original Developer is the Initial Developer.
 *  
 *  All portions of the code written by the Initial Developer are:
 *  Copyright (C) 2004-2007 the Initial Developer.
 *  All Rights Reserved.
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 *  Contributor(s):
 *
 *  Alternatively, the contents of this file may be used under the terms of the 
 *  GNU General Public License Version 2 or later (the GPL), in which case the 
 *  provisions of GPL are applicable instead of those above.  If you wish to allow use
 *  of your version of this file only under the terms of the GPL and not to allow 
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 *  deleting the provisions above and replace them with the notice and other 
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 *  a recipient may use your version of this file under either the CPAL or the GPL.
 *  
 *  *** END LICENSE INFORMATION ***
 */



#ifndef LASS_GUARDIAN_OF_INCLUSION_UTIL_STOP_WATCH_H
#define LASS_GUARDIAN_OF_INCLUSION_UTIL_STOP_WATCH_H

#include "util_common.h"
#include "clock.h"

namespace lass
{
namespace util
{

class StopWatch
{
public:

    typedef Clock::TTime TTime;

    StopWatch(Clock& iClock, TTime iInitialTime = 0):
        clock_(&iClock)
    {
        reset(iInitialTime);
    }

    void reset(TTime iInitialTime = 0)
    {
        timeBuffer_ = iInitialTime;
        isRunning_ = false;
    }

    void start()
    {
        startTime_ = clock_->time();
        isRunning_ = true;
    }

    void restart(TTime iInitialTime = 0)
    {
        reset(iInitialTime);
        start();
    }

    const TTime stop()
    {
        const TTime stopTime = clock_->time();
        if (isRunning_)
        {
            timeBuffer_ += stopTime - startTime_;
            isRunning_ = false;
        }
        return timeBuffer_;
    }

    const TTime time() const
    {
        const TTime t = clock_->time();
        return isRunning_ ? (timeBuffer_ + t - startTime_) : timeBuffer_;
    }

private:

    TTime timeBuffer_;
    TTime startTime_;
    Clock* clock_;
    bool isRunning_;
};

}

}

#endif

// EOF