1 files changed, 121 insertions, 0 deletions
diff --git a/dbaccess/source/core/inc/composertools.hxx b/dbaccess/source/core/inc/composertools.hxx
new file mode 100644
index 000000000..337064757
--- /dev/null
+++ b/dbaccess/source/core/inc/composertools.hxx
@@ -0,0 +1,121 @@
+/* -*- 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 <rtl/ustrbuf.hxx>
+#include <osl/diagnose.h>
+
+namespace dbaccess
+{
+
+    // TokenComposer
+    struct TokenComposer
+    {
+    private:
+        #ifdef DBG_UTIL
+        bool                    m_bUsed;
+        #endif
+
+    protected:
+        OUStringBuffer   m_aBuffer;
+
+    public:
+        OUString getComposedAndClear()
+        {
+            #ifdef DBG_UTIL
+            m_bUsed = true;
+            #endif
+            return m_aBuffer.makeStringAndClear();
+        }
+
+        void clear()
+        {
+            #ifdef DBG_UTIL
+            m_bUsed = false;
+            #endif
+            m_aBuffer.setLength(0);
+        }
+
+    public:
+        TokenComposer()
+        #ifdef DBG_UTIL
+            :m_bUsed( false )
+        #endif
+        {
+        }
+
+        virtual ~TokenComposer()
+        {
+        }
+
+        TokenComposer(TokenComposer const &) = default;
+        TokenComposer(TokenComposer &&) = default;
+        TokenComposer & operator =(TokenComposer const &) = default;
+        TokenComposer & operator =(TokenComposer &&) = default;
+
+        void operator() (const OUString& lhs)
+        {
+            append(lhs);
+        }
+
+        void append( const OUString& lhs )
+        {
+            #ifdef DBG_UTIL
+            OSL_ENSURE( !m_bUsed, "FilterCreator::append: already used up!" );
+            #endif
+            if ( !lhs.isEmpty() )
+            {
+                if ( !m_aBuffer.isEmpty() )
+                    appendNonEmptyToNonEmpty( lhs );
+                else
+                    m_aBuffer.append( lhs );
+            }
+        }
+
+        /// append the given part. Only to be called when both the part and our buffer so far are not empty
+        virtual void appendNonEmptyToNonEmpty( const OUString& lhs ) = 0;
+    };
+
+    // FilterCreator
+    struct FilterCreator : public TokenComposer
+    {
+        virtual void appendNonEmptyToNonEmpty( const OUString& lhs ) override
+        {
+            m_aBuffer.insert( 0, ' ' );
+            m_aBuffer.insert( 0, '(' );
+            m_aBuffer.append( " ) AND ( " );
+            m_aBuffer.append( lhs );
+            m_aBuffer.append( " )" );
+        }
+    };
+
+    // FilterCreator
+    struct OrderCreator : public TokenComposer
+    {
+        virtual void appendNonEmptyToNonEmpty( const OUString& lhs ) override
+        {
+            m_aBuffer.append( ", " );
+            m_aBuffer.append( lhs );
+        }
+    };
+
+} // namespace dbaccess
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */