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 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Lesser General Public License version 3 for more details
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 *
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#ifndef _VOS_TIMER_HXX_
#define _VOS_TIMER_HXX_

#	include <vos/refernce.hxx>
#	include <vos/mutex.hxx>
#	include <osl/time.h>


namespace vos
{     

/////////////////////////////////////////////////////////////////////////////
//
// TTimeValue
//

/** <code> struct TTimeValue </code> : class for times. Times are seconds in UTC since 01.01.1970
 */
struct TTimeValue : public TimeValue
{
	TTimeValue()
    { Seconds = 0; Nanosec = 0; }

    TTimeValue(sal_uInt32 Seconds, sal_uInt32 Nano);

    TTimeValue(sal_uInt32 MilliSecs)
    { Seconds = MilliSecs / 1000L; Nanosec = (MilliSecs % 1000) * 1000000L; }

    TTimeValue(const TTimeValue& rTimeValue)
    { Seconds = rTimeValue.Seconds; Nanosec = rTimeValue.Nanosec; }

    TTimeValue(const TimeValue& rTimeValue)
    { Seconds = rTimeValue.Seconds; Nanosec = rTimeValue.Nanosec; }

	void		SAL_CALL normalize();

    void		SAL_CALL addTime(const TTimeValue& Delta);

	sal_Bool	SAL_CALL isEmpty() const;
};

inline void TTimeValue::normalize()
{
	if (Nanosec > 1000000000)
	{
		Seconds += Nanosec / 1000000000;
		Nanosec %= 1000000000;
	}	
}

inline TTimeValue::TTimeValue(sal_uInt32 Secs, sal_uInt32 Nano)
{
	Seconds = Secs;
	Nanosec = Nano;

    normalize();
}

inline void TTimeValue::addTime(const TTimeValue& Time)
{
	Seconds += Time.Seconds;
	Nanosec += Time.Nanosec;

	normalize();
}

inline sal_Bool TTimeValue::isEmpty() const
{
	return ((Seconds == 0) && (Nanosec == 0));
}

inline sal_Bool operator<(const TTimeValue& rTimeA, const TTimeValue& rTimeB)
{
	if (rTimeA.Seconds < rTimeB.Seconds)
		return sal_True;
	else if (rTimeA.Seconds > rTimeB.Seconds)
		return sal_False;
	else
		return (rTimeA.Nanosec < rTimeB.Nanosec);
}

inline sal_Bool operator>(const TTimeValue& rTimeA, const TTimeValue& rTimeB)
{
	if (rTimeA.Seconds > rTimeB.Seconds)
		return sal_True;
	else if (rTimeA.Seconds < rTimeB.Seconds)
		return sal_False;
	else
		return (rTimeA.Nanosec > rTimeB.Nanosec);
}

inline sal_Bool operator==(const TTimeValue& rTimeA, const TTimeValue& rTimeB)
{
	return ((rTimeA.Seconds == rTimeB.Seconds) && 
		    (rTimeA.Nanosec == rTimeB.Nanosec));
}


/////////////////////////////////////////////////////////////////////////////
//
//  Timer class
//

class OTimerManager;

/** <code> class OTimer </code> : Interface for the Timer and handling the event
*/
class OTimer : virtual public OReference , virtual public OObject
{
	VOS_DECLARE_CLASSINFO(VOS_NAMESPACE(OTimer, vos));

public:

    /// constructor
  	OTimer();
	/// constructor
  	OTimer(const TTimeValue& Time);
	/// constructor
  	OTimer(const TTimeValue& Time, const TTimeValue& RepeatTime);
  	/// start timer.
  	void SAL_CALL start();
  	/// abort timer prematurely.
  	void SAL_CALL stop();
  	/// returns <code> sal_True </code> if timer is running.
  	sal_Bool 	SAL_CALL isTicking() const; 
	/// is the timer expired?
  	sal_Bool 	SAL_CALL isExpired() const;
	/// does <code> pTimer </code> expires before us?
  	sal_Bool    SAL_CALL expiresBefore(const OTimer* pTimer) const;
	/// set the absolute time when the timer should fire
  	void		SAL_CALL setAbsoluteTime(const TTimeValue& Time);
	/// set the time to fire to 'now' + <code> Remaining </code>
  	void		SAL_CALL setRemainingTime(const TTimeValue& Remaining);
	/// set the time to fire to 'now' + <code> Remaining </code> with repeat interveal <code> Repeat </code>
  	void		SAL_CALL setRemainingTime(const TTimeValue& Remaining, const TTimeValue& Repeat);				
	/// adds <code> Time </code> to the 'fire time'
  	void		SAL_CALL addTime(const TTimeValue& Time);
	/// returns the remaining time before timer expiration relative to now
  	TTimeValue	SAL_CALL getRemainingTime() const;

protected:

    /// destructor
    virtual ~OTimer();
    /// what should be done when the 'timer fires'
    virtual void SAL_CALL onShot() = 0;

    /// holds (initial) exparation time of this timer
	TTimeValue  m_TimeOut;
    /// holds the time of exparation of this timer
	TTimeValue  m_Expired;
    /// holds the time interveal of successive exparations
	TTimeValue  m_RepeatDelta;
    /// Pointer to the next timer (to fire)
  	OTimer*	 	m_pNext;

private:

    /// copy constructor disabled
    OTimer(const OTimer& rTimer);
    /// assignment operator disabled
    void SAL_CALL operator=(const OTimer& rTimer);
    
	friend class OTimerManager;
};

}     


#endif  //_VOS_TIMER_HXX_