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diff --git a/dbaccess/source/ui/inc/RelationController.hxx b/dbaccess/source/ui/inc/RelationController.hxx
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+++ b/dbaccess/source/ui/inc/RelationController.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 <memory>
+#include <string_view>
+
+#include "JoinController.hxx"
+
+namespace weld
+{
+    class WaitObject;
+}
+
+namespace dbaui
+{
+    class ORelationController : public OJoinController
+    {
+        css::uno::Reference< css::container::XNameAccess >    m_xTables;
+        std::unique_ptr<weld::WaitObject> m_xWaitObject;
+        sal_uLong       m_nThreadEvent;
+        bool            m_bRelationsPossible;
+    protected:
+        // all the features which should be handled by this class
+        virtual void            describeSupportedFeatures() override;
+        // state of a feature. 'feature' may be the handle of a css::util::URL somebody requested a dispatch interface for OR a toolbar slot.
+        virtual FeatureState    GetState(sal_uInt16 nId) const override;
+        // execute a feature
+        virtual void            Execute(sal_uInt16 nId, const css::uno::Sequence< css::beans::PropertyValue>& aArgs) override;
+
+        void loadData();
+        TTableWindowData::value_type existsTable(std::u16string_view _rComposedTableName) const;
+
+        // load the window positions out of the datasource
+        void loadLayoutInformation();
+    public:
+        ORelationController(const css::uno::Reference< css::uno::XComponentContext >& _rM);
+
+        virtual ~ORelationController() override;
+
+        void mergeData(const TTableConnectionData& _aConnectionData);
+
+        virtual bool Construct(vcl::Window* pParent) override;
+
+        // XServiceInfo
+        virtual OUString SAL_CALL getImplementationName() override;
+        virtual css::uno::Sequence< OUString> SAL_CALL getSupportedServiceNames() override;
+
+        // OJoinController overridables
+        virtual bool allowViews() const override;
+        virtual bool allowQueries() const override;
+
+    private:
+        // ask the user if the design should be saved when it is modified
+        virtual short saveModified() override;
+        virtual void reset() override;
+        virtual void impl_initialize() override;
+        virtual OUString getPrivateTitle( ) const override;
+        DECL_LINK( OnThreadFinished, void*, void );
+    };
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */