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#ifndef EXTENSION_H

#define EXTENSION_H

#include <QtCore/QString>

#include <QtCore/QObject>

QT_BEGIN_HEADER

QT_BEGIN_NAMESPACE

#define Q_TYPEID(IFace) QLatin1String(IFace##_iid)

class QAbstractExtensionFactory

{

public:

    virtual ~QAbstractExtensionFactory() {}

    virtual QObject *extension(QObject *object, const QString &iid) const = 0;

};

Q_DECLARE_INTERFACE(QAbstractExtensionFactory, "com.trolltech.Qt.QAbstractExtensionFactory")

class QAbstractExtensionManager

{

public:

    virtual ~QAbstractExtensionManager() {}

    virtual void registerExtensions(QAbstractExtensionFactory *factory, const QString &iid) = 0;

    virtual void unregisterExtensions(QAbstractExtensionFactory *factory, const QString &iid) = 0;

    virtual QObject *extension(QObject *object, const QString &iid) const = 0;

};

Q_DECLARE_INTERFACE(QAbstractExtensionManager, "com.trolltech.Qt.QAbstractExtensionManager")

#if defined(Q_CC_MSVC) && (_MSC_VER < 1300)

template <class T>

inline T qt_extension_helper(QAbstractExtensionManager *, QObject *, T)

{ return 0; }

template <class T>

inline T qt_extension(QAbstractExtensionManager* manager, QObject *object)

{ return qt_extension_helper(manager, object, T(0)); }

#define Q_DECLARE_EXTENSION_INTERFACE(IFace, IId) \

const char * const IFace##_iid = IId; \

Q_DECLARE_INTERFACE(IFace, IId) \

template <> inline IFace *qt_extension_helper<IFace *>(QAbstractExtensionManager *manager, QObject *object, IFace *) \

{ QObject *extension = manager->extension(object, Q_TYPEID(IFace)); return (IFace *)(extension ? extension->qt_metacast(IFace##_iid) : 0); }

#else

template <class T>

inline T qt_extension(QAbstractExtensionManager* manager, QObject *object)

{ return 0; }

#define Q_DECLARE_EXTENSION_INTERFACE(IFace, IId) \

const char * const IFace##_iid = IId; \

Q_DECLARE_INTERFACE(IFace, IId) \

template <> inline IFace *qt_extension<IFace *>(QAbstractExtensionManager *manager, QObject *object) \

{ QObject *extension = manager->extension(object, Q_TYPEID(IFace)); return extension ? static_cast<IFace *>(extension->qt_metacast(IFace##_iid)) : static_cast<IFace *>(0); }

#endif

QT_END_NAMESPACE

QT_END_HEADER

#endif // EXTENSION_H