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diff --git a/dbaccess/source/inc/apitools.hxx b/dbaccess/source/inc/apitools.hxx
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+++ b/dbaccess/source/inc/apitools.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 <sal/config.h>
+
+#include <cppuhelper/component.hxx>
+#include <osl/mutex.hxx>
+
+// OSubComponent - a component which holds a hard ref to its parent
+//                 and is been hold itself (by the parent) with a weak ref
+class OSubComponent : public ::cppu::OComponentHelper
+{
+protected:
+    // the parent must support the tunnel implementation
+    css::uno::Reference< css::uno::XInterface > m_xParent;
+    virtual ~OSubComponent() override;
+
+public:
+    OSubComponent(::osl::Mutex& _rMutex,
+                  const css::uno::Reference< css::uno::XInterface >& _xParent);
+
+// css::lang::XTypeProvider
+    virtual css::uno::Sequence< css::uno::Type > SAL_CALL getTypes() override;
+
+// css::uno::XInterface
+    virtual css::uno::Any SAL_CALL queryInterface( const css::uno::Type & rType ) override;
+    virtual void SAL_CALL release() noexcept override;
+
+    operator css::uno::Reference< css::uno::XInterface > () const
+        { return static_cast<css::uno::XWeak *>(const_cast<OSubComponent *>(this)); }
+
+};
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */