/****************************************************************************
** Copyright (C) 2001-2010 Klaralvdalens Datakonsult AB.  All rights reserved.
**
** This file is part of the KD Tools library.
**
** Licensees holding valid commercial KD Tools licenses may use this file in
** accordance with the KD Tools Commercial License Agreement provided with
** the Software.
**
**
** This file may be distributed and/or modified under the terms of the
** GNU Lesser General Public License version 2 and version 3 as published by the
** Free Software Foundation and appearing in the file LICENSE.LGPL included.
**
** This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
** WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
**
** Contact info@kdab.com if any conditions of this licensing are not
** clear to you.
**
**********************************************************************/

#ifndef __KDTOOLSCORE__KDGENERICFACTORY_H__
#define __KDTOOLSCORE__KDGENERICFACTORY_H__

#include <KDToolsCore/kdtoolsglobal.h>

#include <QtCore/QHash>

template< typename T_Product, typename T_Identifier = QString, template< typename U, typename V > class T_Map = QHash >
class KDGenericFactory
{
public:
    virtual ~KDGenericFactory()
    {
    }

    typedef T_Product* (*FactoryFunction)();

    template< typename T >
    void registerProduct( const T_Identifier& name )
    {
#ifdef Q_CC_MSVC
        FactoryFunction function = &KDGenericFactory::create<T>;
        registerProductionFunction( name, function );
#else
        registerProductionFunction( name, &create<T> );
#endif
    }

    void unregisterProduct( const T_Identifier& name )
    {
        map.remove( name );
    }

    unsigned int productCount() const
    {
        return map.size();
    }

    QList< T_Identifier > availableProducts() const
    {
        return map.keys();
    }

    T_Product* create( const T_Identifier& name ) const
    {
        const typename T_Map< T_Identifier, FactoryFunction >::const_iterator it = map.find( name );
        if( it == map.end() )
            return 0;
        return (*it)();
    }

protected:
    void registerProductionFunction( const T_Identifier& name, FactoryFunction create )
    {
        map.insert( name, create );
    }

private:
    template< typename T >
    static T_Product* create()
    {
        return new T;
    }

    T_Map< T_Identifier, FactoryFunction > map;
};

#endif