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diff --git a/src/qml/qml/v8/qscriptisolate_p.h b/src/qml/qml/v8/qscriptisolate_p.h
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+++ b/src/qml/qml/v8/qscriptisolate_p.h
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+/****************************************************************************
+**
+** Copyright (C) 2012 Nokia Corporation and/or its subsidiary(-ies).
+** Contact: http://www.qt-project.org/
+**
+** This file is part of the QtScript module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL-ONLY$
+** GNU Lesser General Public License Usage
+** 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.
+**
+** If you have questions regarding the use of this file, please contact
+** us via http://www.qt-project.org/.
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#ifndef APIPREAMBLE_P_H
+#define APIPREAMBLE_P_H
+
+#include <private/qv8_p.h>
+#include "qv8engine_p.h"
+
+QT_BEGIN_NAMESPACE
+
+/**
+  \internal
+  Class used to switch to the right isolate. It does the same thing as v8::Isolate::Scope but
+  it checks for a null engine.
+  \attention We decided to put context switching "up" which means that it should be as high
+  as possible on call stack. And it should be switched at most once per public API function call.
+*/
+class QScriptIsolate {
+public:
+    // OperationMode was introduced to reduce number of checking for a null engine pointer. If we
+    // know that given pointer is not null than we should pass NotNullEngine as constructor argument
+    // that would nicely remove checking on compilation time.
+    enum OperationMode {Default, NotNullEngine};
+    inline QScriptIsolate(const QV8Engine *engine, const OperationMode mode = Default)
+        : m_engine(engine)
+        , m_mode(mode)
+    {
+        if (m_mode == NotNullEngine || m_engine) {
+            Q_ASSERT(m_engine);
+            m_engine->context()->Enter();
+        }
+    }
+
+    inline ~QScriptIsolate()
+    {
+        if (m_mode == NotNullEngine || m_engine) {
+            m_engine->context()->Exit();
+        }
+    }
+
+private:
+    Q_DISABLE_COPY(QScriptIsolate);
+    const QV8Engine *m_engine;
+    const OperationMode m_mode;
+};
+
+
+QT_END_NAMESPACE
+
+#endif // APIPREAMBLE_P_H