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diff --git a/chart2/source/inc/ControllerLockGuard.hxx b/chart2/source/inc/ControllerLockGuard.hxx
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+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * This file incorporates work covered by the following license notice:
+ *
+ *   Licensed to the Apache Software Foundation (ASF) under one or more
+ *   contributor license agreements. See the NOTICE file distributed
+ *   with this work for additional information regarding copyright
+ *   ownership. The ASF licenses this file to you under the Apache
+ *   License, Version 2.0 (the "License"); you may not use this file
+ *   except in compliance with the License. You may obtain a copy of
+ *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
+ */
+#pragma once
+
+#include "charttoolsdllapi.hxx"
+#include <rtl/ref.hxx>
+
+namespace chart
+{
+class ChartModel;
+}
+namespace com::sun::star::frame
+{
+class XModel;
+}
+
+namespace chart
+{
+/** This guard calls lockControllers at the given Model in the CTOR and
+    unlockControllers in the DTOR.  Using this ensures that controllers do not
+    remain locked when leaving a function even in case an exception is thrown.
+ */
+class OOO_DLLPUBLIC_CHARTTOOLS ControllerLockGuardUNO
+{
+public:
+    explicit ControllerLockGuardUNO(const rtl::Reference<::chart::ChartModel>& xModel);
+    ~ControllerLockGuardUNO();
+
+private:
+    rtl::Reference<::chart::ChartModel> mxModel;
+};
+
+class ControllerLockGuard
+{
+public:
+    explicit ControllerLockGuard(ChartModel& rModel);
+    ~ControllerLockGuard();
+
+private:
+    ChartModel& mrModel;
+};
+
+/** This helper class can be used to pass a locking mechanism to other objects
+    without exposing the full XModel to it.
+
+    Use the ControllerLockHelperGuard to lock/unlock the model during a block of
+    instructions.
+ */
+class OOO_DLLPUBLIC_CHARTTOOLS ControllerLockHelper
+{
+public:
+    explicit ControllerLockHelper(const rtl::Reference<::chart::ChartModel>& xModel);
+    ~ControllerLockHelper();
+
+    SAL_DLLPRIVATE void lockControllers();
+    SAL_DLLPRIVATE void unlockControllers();
+
+private:
+    rtl::Reference<::chart::ChartModel> m_xModel;
+};
+
+/** This guard calls lockControllers at the given ControllerLockHelper in the
+    CTOR and unlockControllers in the DTOR.  Using this ensures that controllers
+    do not remain locked when leaving a function even in case an exception is
+    thrown.
+ */
+class OOO_DLLPUBLIC_CHARTTOOLS ControllerLockHelperGuard
+{
+public:
+    explicit ControllerLockHelperGuard(ControllerLockHelper& rHelper);
+    ~ControllerLockHelperGuard();
+
+private:
+    ControllerLockHelper& m_rHelper;
+};
+
+} //  namespace chart
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */