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diff --git a/src/settingfilter.h b/src/settingfilter.h
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+/***************************************************************************
+                               settingfilter.h
+                             -------------------
+    begin                : Wed Nov 28 2007
+    copyright            : (C) 2007 - 2012 by Roland Riegel
+    email                : feedback@roland-riegel.de
+ ***************************************************************************/
+
+/***************************************************************************
+ *                                                                         *
+ *   This program is free software; you can redistribute it and/or modify  *
+ *   it under the terms of the GNU General Public License as published by  *
+ *   the Free Software Foundation; either version 2 of the License, or     *
+ *   (at your option) any later version.                                   *
+ *                                                                         *
+ ***************************************************************************/
+
+#ifndef SETTINGFILTER_H
+#define SETTINGFILTER_H
+
+#include <map>
+#include <string>
+
+class SettingFilter
+{
+    public:
+        virtual ~SettingFilter() {}
+
+        virtual std::string getId() const = 0;
+
+        virtual bool filterWrite(std::string& valueNew) = 0;
+        virtual void filterRead(std::string& value) = 0;
+};
+
+class SettingFilterDefault : public SettingFilter
+{
+    public:
+        SettingFilterDefault(const std::string& def);
+        ~SettingFilterDefault();
+
+        std::string getId() const;
+
+        void setDefault(const std::string& def);
+        const std::string& getDefault() const;
+
+        bool filterWrite(std::string& valueNew);
+        void filterRead(std::string& value);
+        
+    private:
+        std::string m_default;
+};
+
+class SettingFilterExclusive : public SettingFilter
+{
+    public:
+        SettingFilterExclusive(const std::string& exclusive);
+        ~SettingFilterExclusive();
+
+        std::string getId() const;
+
+        void setExclusive(const std::string& exclusive);
+        const std::string& getExclusive() const;
+
+        bool filterWrite(std::string& valueNew);
+        void filterRead(std::string& value);
+        
+    private:
+        void substituteExclusive(std::string& value);
+
+        std::string m_exclusive;
+};
+
+class SettingFilterMap : public SettingFilter
+{
+    public:
+        SettingFilterMap(const std::map<std::string, std::string>& filterMap);
+        ~SettingFilterMap();
+
+        std::string getId() const;
+
+        void setMap(const std::map<std::string, std::string>& filterMap);
+        const std::map<std::string, std::string>& getMap() const;
+
+        bool filterWrite(std::string& valueNew);
+        void filterRead(std::string& value);
+        
+    private:
+        std::map<std::string, std::string> m_filterMap;
+};
+
+class SettingFilterMin : public SettingFilter
+{
+    public:
+        SettingFilterMin(int min);
+        ~SettingFilterMin();
+
+        std::string getId() const;
+
+        void setMin(int min);
+        int getMin() const;
+
+        bool filterWrite(std::string& valueNew);
+        void filterRead(std::string& value);
+        
+    private:
+        int m_min;
+};
+
+class SettingFilterMax : public SettingFilter
+{
+    public:
+        SettingFilterMax(int max);
+        ~SettingFilterMax();
+
+        std::string getId() const;
+
+        void setMax(int max);
+        int getMax() const;
+
+        bool filterWrite(std::string& valueNew);
+        void filterRead(std::string& value);
+        
+    private:
+        int m_max;
+};
+
+#endif
+