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diff --git a/reportdesign/inc/conditionalexpression.hxx b/reportdesign/inc/conditionalexpression.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 .
+ */
+
+#ifndef INCLUDED_REPORTDESIGN_INC_CONDITIONALEXPRESSION_HXX
+#define INCLUDED_REPORTDESIGN_INC_CONDITIONALEXPRESSION_HXX
+
+#include "dllapi.h"
+
+#include <rtl/ustring.hxx>
+#include <map>
+#include <memory>
+
+namespace rptui
+{
+
+
+    // = ConditionalExpression
+
+    class REPORTDESIGN_DLLPUBLIC ConditionalExpression
+    {
+    private:
+        const OUString       m_sPattern;
+
+    public:
+        ConditionalExpression( const char* _pAsciiPattern );
+
+        /** assembles an expression string from a field data source, and one or two operands
+        */
+        OUString     assembleExpression( const OUString& _rFieldDataSource, const OUString& _rLHS, const OUString& _rRHS ) const;
+
+        /** matches the given expression string to the expression pattern represented by the object
+            @param  _rExpression
+                the expression to match
+            @param  _rFieldDataSource
+                the field data source
+            @param  _out_rLHS
+                output parameter taking the left hand side operand, if successful
+            @param  _out_rRHS
+                output parameter taking the right hand side operand, if successful
+            @return
+                <TRUE/> if and only if the expression string could be successfully matched to
+                the pattern.
+        */
+        bool                matchExpression( const OUString& _rExpression, const OUString& _rFieldDataSource, OUString& _out_rLHS, OUString& _out_rRHS ) const;
+    };
+
+
+    //= ConditionType
+
+    enum ConditionType
+    {
+        eFieldValueComparison   = 0,
+        eExpression             = 1
+    };
+
+
+    //= ComparisonOperation
+
+    enum ComparisonOperation
+    {
+        eBetween        = 0,
+        eNotBetween     = 1,
+        eEqualTo        = 2,
+        eNotEqualTo     = 3,
+        eGreaterThan    = 4,
+        eLessThan       = 5,
+        eGreaterOrEqual = 6,
+        eLessOrEqual    = 7
+    };
+
+    typedef std::shared_ptr< ConditionalExpression >                PConditionalExpression;
+    typedef ::std::map< ComparisonOperation, PConditionalExpression >   ConditionalExpressions;
+
+
+    // = ConditionalExpressionFactory
+
+    class REPORTDESIGN_DLLPUBLIC ConditionalExpressionFactory
+    {
+    public:
+        /// fills the given map with all ConditionalExpressions which we know
+        static size_t  getKnownConditionalExpressions( ConditionalExpressions& _out_rCondExp );
+
+    private:
+        ConditionalExpressionFactory( const ConditionalExpressionFactory& ) = delete;
+        ConditionalExpressionFactory& operator=( const ConditionalExpressionFactory& ) = delete;
+    };
+
+} // namespace rptui
+
+
+#endif // INCLUDED_REPORTDESIGN_INC_CONDITIONALEXPRESSION_HXX
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */