kgenericfactory.h

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/* This file is part of the KDE project
 * Copyright (C) 2001 Simon Hausmann <hausmann@kde.org>
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Library General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Library General Public License for more details.
 *
 * You should have received a copy of the GNU Library General Public License
 * along with this library; see the file COPYING.LIB.  If not, write to
 * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
 * Boston, MA 02110-1301, USA.
 */
#ifndef kgenericfactory_h
#define kgenericfactory_h

#include <klibloader.h>
#include <kpluginfactory.h>
#include <kpluginloader.h>
#include <ktypelist.h>
#include <kcomponentdata.h>
#include <kgenericfactory.tcc>
#include <kglobal.h>
#include <klocale.h>
#include <kdebug.h>

#ifndef KDE_NO_DEPRECATED

/* @internal */
template <class T>
class KGenericFactoryBase : public KPluginFactory
{
public:
    explicit KGenericFactoryBase(const char *componentName, const char *catalogName)
        : KPluginFactory(componentName, catalogName)
    {
        s_self = this;
        s_createComponentDataCalled = false;
    }

    explicit KGenericFactoryBase( const KAboutData *data )
        : KPluginFactory(data)
    {
        s_self = this;
        s_createComponentDataCalled = false;
    }

    virtual ~KGenericFactoryBase()
    {
        s_self = 0;
    }

    static KComponentData componentData()
    {
        Q_ASSERT(s_self);
        if (!s_createComponentDataCalled) {
            s_createComponentDataCalled = true;

            KComponentData *kcd = s_self->createComponentData();
            Q_ASSERT(kcd);
            s_self->setComponentData(*kcd);
            delete kcd;
        }
        return static_cast<KPluginFactory *>(s_self)->componentData();
    }

protected:
    virtual KComponentData *createComponentData()
    {
        return new KComponentData(componentData());
    }

private:
    static bool s_createComponentDataCalled;
    static KGenericFactoryBase<T> *s_self;
};

/* @internal */
template <class T>
KGenericFactoryBase<T> *KGenericFactoryBase<T>::s_self = 0;

/* @internal */
template <class T>
bool KGenericFactoryBase<T>::s_createComponentDataCalled = false;

template <class Product, class ParentType = QObject>
class KDE_DEPRECATED KGenericFactory : public KGenericFactoryBase<Product>
{
public:
    explicit KGenericFactory( const char *componentName = 0, const char *catalogName = 0 )
        : KGenericFactoryBase<Product>(componentName, catalogName)
    {}

    explicit KGenericFactory( const KAboutData *data )
        : KGenericFactoryBase<Product>(data)
    {}

protected:
    virtual QObject *createObject( QObject *parent,
                                   const char *className, const QStringList &args )
    {
        return KDEPrivate::ConcreteFactory<Product, ParentType>
            ::create( 0, parent, className, args );
    }
};

template <class Product, class ProductListTail>
class KGenericFactory< KTypeList<Product, ProductListTail>, QObject >
    : public KGenericFactoryBase<KTypeList<Product, ProductListTail> >
{
public:
    explicit KGenericFactory( const char *componentName  = 0, const char *catalogName  = 0 )
        : KGenericFactoryBase<KTypeList<Product, ProductListTail> >(componentName, catalogName)
    {}

    explicit KGenericFactory( const KAboutData *data )
        : KGenericFactoryBase<KTypeList<Product, ProductListTail> >(data)
    {}


protected:
    virtual QObject *createObject( QObject *parent,
                                   const char *className, const QStringList &args )
    {
        return KDEPrivate::MultiFactory< KTypeList< Product, ProductListTail > >
            ::create( 0, parent, className, args );
    }
};

template <class Product, class ProductListTail,
          class ParentType, class ParentTypeListTail>
class KGenericFactory< KTypeList<Product, ProductListTail>,
                       KTypeList<ParentType, ParentTypeListTail> >
    : public KGenericFactoryBase<KTypeList<Product, ProductListTail> >
{
public:
    explicit KGenericFactory( const char *componentName  = 0, const char *catalogName  = 0 )
        : KGenericFactoryBase<KTypeList<Product, ProductListTail> >(componentName, catalogName)
    {}
    explicit KGenericFactory( const KAboutData *data )
        : KGenericFactoryBase<KTypeList<Product, ProductListTail> >(data)
    {}


protected:
    virtual QObject *createObject( QObject *parent,
                                   const char *className, const QStringList &args )
    {
        return KDEPrivate::MultiFactory< KTypeList< Product, ProductListTail >,
                                         KTypeList< ParentType, ParentTypeListTail > >
                                       ::create( 0, 0, parent,
                                                 className, args );
    }
};

#endif
#endif