/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
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 * This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/.
 *
 * This file incorporates work covered by the following license notice:
 *
 *   Licensed to the Apache Software Foundation (ASF) under one or more
 *   contributor license agreements. See the NOTICE file distributed
 *   with this work for additional information regarding copyright
 *   ownership. The ASF licenses this file to you under the Apache
 *   License, Version 2.0 (the "License"); you may not use this file
 *   except in compliance with the License. You may obtain a copy of
 *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
 */

#ifndef INCLUDED_DBACCESS_SOURCE_EXT_MACROMIGRATION_PROGRESSMIXER_HXX
#define INCLUDED_DBACCESS_SOURCE_EXT_MACROMIGRATION_PROGRESSMIXER_HXX

#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;

    protected:
        ~IProgressConsumer() {}
    };

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

        /** registers a phase of the process, which has the given weight
            in the overall process
            @precond
                the progress is not running, 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::unique_ptr< ProgressMixer_Data >   m_pData;
    };

} // namespace dbmm

#endif // INCLUDED_DBACCESS_SOURCE_EXT_MACROMIGRATION_PROGRESSMIXER_HXX

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