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+/****************************************************************************
+**
+** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies).
+** All rights reserved.
+** Contact: Nokia Corporation (qt-info@nokia.com)
+**
+** This file is part of the Qt Designer of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** No Commercial Usage
+** This file contains pre-release code and may not be distributed.
+** You may use this file in accordance with the terms and conditions
+** contained in the Technology Preview License Agreement accompanying
+** this package.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 2.1 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU Lesser General Public License version 2.1 requirements
+** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, Nokia gives you certain additional
+** rights.  These rights are described in the Nokia Qt LGPL Exception
+** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
+**
+** If you have questions regarding the use of this file, please contact
+** Nokia at qt-info@nokia.com.
+**
+**
+**
+**
+**
+**
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+//
+//  W A R N I N G
+//  -------------
+//
+// This file is not part of the Qt API.  It exists for the convenience
+// of Qt Designer.  This header
+// file may change from version to version without notice, or even be removed.
+//
+// We mean it.
+//
+
+#ifndef SHARED_EXTENSIONFACTORY_H
+#define SHARED_EXTENSIONFACTORY_H
+
+#include <QtDesigner/default_extensionfactory.h>
+#include <QtDesigner/QExtensionManager>
+
+QT_BEGIN_NAMESPACE
+
+namespace qdesigner_internal {
+
+// Extension factory for registering an extension for an object type.
+template <class ExtensionInterface, class Object, class Extension>
+class ExtensionFactory: public QExtensionFactory
+{
+public:
+    explicit ExtensionFactory(const QString &iid, QExtensionManager *parent = 0);
+
+    // Convenience for registering the extension. Do not use for derived classes.
+    static void registerExtension(QExtensionManager *mgr, const QString &iid);
+
+protected:
+    virtual QObject *createExtension(QObject *qObject, const QString &iid, QObject *parent) const;
+
+private:
+    // Can be overwritten to perform checks on the object.
+    // Default does a qobject_cast to the desired class.
+    virtual Object *checkObject(QObject *qObject) const;
+
+    const QString m_iid;
+};
+
+template <class ExtensionInterface, class Object, class Extension>
+ExtensionFactory<ExtensionInterface, Object, Extension>::ExtensionFactory(const QString &iid, QExtensionManager *parent) :
+    QExtensionFactory(parent),
+    m_iid(iid)
+{
+}
+
+template <class ExtensionInterface, class Object, class Extension>
+Object *ExtensionFactory<ExtensionInterface, Object, Extension>::checkObject(QObject *qObject) const
+{
+    return qobject_cast<Object*>(qObject);
+}
+
+template <class ExtensionInterface, class Object, class Extension>
+QObject *ExtensionFactory<ExtensionInterface, Object, Extension>::createExtension(QObject *qObject, const QString &iid, QObject *parent) const
+{
+    if (iid != m_iid)
+        return 0;
+
+    Object *object = checkObject(qObject);
+    if (!object)
+        return 0;
+
+    return new Extension(object, parent);
+}
+
+template <class ExtensionInterface, class Object, class Extension>
+void ExtensionFactory<ExtensionInterface, Object, Extension>::registerExtension(QExtensionManager *mgr, const QString &iid)
+{
+    ExtensionFactory *factory = new ExtensionFactory(iid, mgr);
+    mgr->registerExtensions(factory, iid);
+}
+}  // namespace qdesigner_internal
+
+QT_END_NAMESPACE
+
+#endif // SHARED_EXTENSIONFACTORY_H