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#ifndef DBACCESS_PROGRESSMIXER_HXX
#define DBACCESS_PROGRESSMIXER_HXX

/** === begin UNO includes === **/
/** === end UNO includes === **/

#include <sal/types.h>

#include <memory>

//........................................................................
namespace dbmm
{
//........................................................................

    typedef sal_uInt32  PhaseID;
    typedef sal_uInt32  PhaseWeight;

    //====================================================================
    //= IProgressConsumer
    //====================================================================
    class SAL_NO_VTABLE IProgressConsumer
    {
    public:
        virtual void    start( sal_uInt32 _nRange ) = 0;
        virtual void    advance( sal_uInt32 _nValue ) = 0;
        virtual void    end() = 0;
    };

    //====================================================================
    //= ProgressMixer
    //====================================================================
    struct ProgressMixer_Data;
    /** a class which mixes (i.e. concatenates) progress values from different
        sources/phases, with different weight
    */
    class ProgressMixer
    {
    public:
        ProgressMixer( IProgressConsumer& _rConsumer );
        ~ProgressMixer();

        /** registers a phase of the process, which has the given weight
            in the overall process
            @precond
                the progress is not runnig, yet
        */
        void    registerPhase( const PhaseID _nID, const PhaseWeight _nWeight );

        /** enters the phase with the given ID, with the phase having
            the given overall range
        */
        void    startPhase( const PhaseID _nID, const sal_uInt32 _nPhaseRange );

        /** announces a new progress in the current phase.

            The given phase progress must be between 0 and the overall phase range
            as specified in ->startPhase.
        */
        void    advancePhase( const sal_uInt32 _nPhaseProgress );

        /** leaves the current phase, which has been started with ->startPhase previously
        */
        void    endPhase();

    private:
        ::std::auto_ptr< ProgressMixer_Data >   m_pData;
    };

//........................................................................
} // namespace dbmm
//........................................................................

#endif // DBACCESS_PROGRESSMIXER_HXX

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