//%LICENSE////////////////////////////////////////////////////////////////
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// this work for additional information regarding copyright ownership.
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#ifndef Pegasus_Stopwatch_h
#define Pegasus_Stopwatch_h

#include <Pegasus/Common/Config.h>

#include <Pegasus/Common/Linkage.h>

PEGASUS_NAMESPACE_BEGIN

/** Stopwatch - A class for measuring elapsed time
    Stopwatch is a class for measuring time intervals within the environment.
    It is intended to be a developers tool primarily.
*/
class PEGASUS_COMMON_LINKAGE Stopwatch
{
public:

    /** constructor. The constructor creates the object. Start
    must be called to start the timer.
    @example Stopwatch time;
    */
    Stopwatch();

    /** start - Starts accumulating time and continues until stop is called.
    The object can be started and stopped multiple times to measure the
    sum of several intervals, but each start must have a corresponding start.
    */
    void start();

    /** stop - Stops the accumlation of time for an interval. The object
    should only stopped if it has been started.
    */
    void stop();

    /** reset - Effectively clears the time values stored by a Stopwatch.
    */
    void reset();

    /** getElapsed - Get the elapsed time for the defined stopwatch. This
    method should only be called if it is currently stopped.
    @return Returns the elapsed time value as a double (in milliseconds).
    */
    double getElapsed() const;

    /** Get number of elapsed microseconds
    */
    Uint64 getElapsedUsec() const;

    /** printElapsed method gets the current value of the timer and
    sends it to standard out as a string with the word seconds attached
    */
    void printElapsed();

private:
    Uint64 _start;
    Uint64 _stop;
    Uint64 _total;
};

PEGASUS_NAMESPACE_END

#endif /* Pegasus_Stopwatch_h */