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diff --git a/dbaccess/source/core/api/querydescriptor.hxx b/dbaccess/source/core/api/querydescriptor.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 <cppuhelper/implbase3.hxx>
+#include <comphelper/proparrhlp.hxx>
+#include <osl/mutex.hxx>
+
+#include <com/sun/star/sdbcx/XColumnsSupplier.hpp>
+#include <com/sun/star/lang/XServiceInfo.hpp>
+#include <com/sun/star/lang/XUnoTunnel.hpp>
+
+#include <apitools.hxx>
+#include <column.hxx>
+#include <datasettings.hxx>
+#include <commandbase.hxx>
+#include <comphelper/broadcasthelper.hxx>
+#include <comphelper/uno3.hxx>
+
+namespace dbaccess
+{
+
+// OQueryDescriptor_Base - a query descriptor (as the name suggests :)
+typedef ::cppu::ImplHelper3<
+        css::sdbcx::XColumnsSupplier,
+        css::lang::XUnoTunnel,
+        css::lang::XServiceInfo >  OQueryDescriptor_BASE;
+
+class OQueryDescriptor_Base
+        :public OQueryDescriptor_BASE
+        ,public OCommandBase
+        ,public IColumnFactory
+        ,public ::connectivity::sdbcx::IRefreshableColumns
+{
+private:
+    bool        m_bColumnsOutOfDate : 1;    // the columns have to be rebuild on the next getColumns ?
+    ::osl::Mutex&   m_rMutex;
+
+protected:
+    std::unique_ptr<OColumns> m_pColumns;                 // our column descriptions
+    OUString m_sElementName;
+    virtual ~OQueryDescriptor_Base();
+
+    void        setColumnsOutOfDate( bool _bOutOfDate = true );
+
+    sal_Int32   getColumnCount() const { return m_pColumns ? m_pColumns->getCount() : 0; }
+    void        clearColumns( );
+
+    void        implAppendColumn( const OUString& _rName, OColumn* _pColumn );
+
+public:
+    OQueryDescriptor_Base(::osl::Mutex& _rMutex,::cppu::OWeakObject& _rMySelf);
+    /** constructs the object with a UNO QueryDescriptor. If you use this ctor, the resulting object
+        won't have any column information (the column container will be empty)
+    */
+    OQueryDescriptor_Base(const OQueryDescriptor_Base& _rSource,::cppu::OWeakObject& _rMySelf);
+
+// css::sdbcx::XColumnsSupplier
+    virtual css::uno::Reference< css::container::XNameAccess > SAL_CALL getColumns(  ) override;
+
+// css::lang::XUnoTunnel
+    virtual sal_Int64 SAL_CALL getSomething( const css::uno::Sequence< sal_Int8 >& aIdentifier ) override;
+    virtual css::uno::Sequence<sal_Int8> SAL_CALL getImplementationId(  ) override;
+    static const css::uno::Sequence< sal_Int8 > & getUnoTunnelId();
+
+
+// css::lang::XServiceInfo
+    virtual OUString SAL_CALL getImplementationName(  ) override;
+    virtual sal_Bool SAL_CALL supportsService( const OUString& ServiceName ) override;
+    virtual css::uno::Sequence< OUString > SAL_CALL getSupportedServiceNames(  ) override;
+
+protected:
+
+// IColumnFactory
+    virtual rtl::Reference<OColumn> createColumn(const OUString& _rName) const override;
+    virtual css::uno::Reference< css::beans::XPropertySet > createColumnDescriptor() override;
+    virtual void columnAppended( const css::uno::Reference< css::beans::XPropertySet >& _rxSourceDescriptor ) override;
+    virtual void columnDropped(const OUString& _sName) override;
+
+    /** rebuild our columns set
+
+        clearColumns has already been called before, do <em>NOT</em> call it, again
+    */
+    virtual void rebuildColumns( );
+
+    void disposeColumns();
+
+    // IRefreshableColumns overridables
+    virtual void refreshColumns() override;
+};
+
+class OQueryDescriptor : public comphelper::OMutexAndBroadcastHelper
+                        ,public ::cppu::OWeakObject
+                        ,public OQueryDescriptor_Base
+                        ,public ::comphelper::OPropertyArrayUsageHelper< OQueryDescriptor_Base >
+                        ,public ODataSettings
+{
+    OQueryDescriptor(const OQueryDescriptor&) = delete;
+    void operator =(const OQueryDescriptor&) = delete;
+    // helper
+    void registerProperties();
+protected:
+    // OPropertyArrayUsageHelper
+    virtual ::cppu::IPropertyArrayHelper* createArrayHelper( ) const override;
+
+    // OPropertySetHelper
+    virtual ::cppu::IPropertyArrayHelper& SAL_CALL getInfoHelper() override;
+
+    virtual ~OQueryDescriptor() override;
+public:
+    OQueryDescriptor();
+    explicit OQueryDescriptor(const OQueryDescriptor_Base& _rSource);
+
+    virtual css::uno::Sequence<css::uno::Type> SAL_CALL getTypes() override;
+    virtual css::uno::Sequence<sal_Int8> SAL_CALL getImplementationId() override;
+
+// css::uno::XInterface
+    DECLARE_XINTERFACE( )
+
+    // css::beans::XPropertySet
+    virtual css::uno::Reference< css::beans::XPropertySetInfo > SAL_CALL getPropertySetInfo(  ) override;
+
+};
+}   // namespace dbaccess
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */