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+// Copyright (C) 2009 - 2012  Mathias Froehlich
+//
+// 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.
+//
+// This program is distributed in the hope that it will be useful, but
+// WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+// General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program; if not, write to the Free Software
+// Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
+
+#ifndef AISubsystem_hxx
+#define AISubsystem_hxx
+
+#include <list>
+#include <simgear/structure/SGWeakReferenced.hxx>
+#include <simgear/timing/timestamp.hxx>
+
+namespace fgai {
+
+class AIObject;
+
+class AISubsystem : public SGWeakReferenced {
+public:
+    AISubsystem()
+    { }
+    virtual ~AISubsystem()
+    { }
+    
+    virtual void update(AIObject& object, const SGTimeStamp& dt) = 0;
+};
+
+class AISubsystemGroup : public AISubsystem {
+public:
+    AISubsystemGroup()
+    { }
+    virtual ~AISubsystemGroup()
+    { }
+    
+    virtual void update(AIObject& object, const SGTimeStamp& dt)
+    {
+        for (SubsystemList::iterator i = _subsystemList.begin();
+             i != _subsystemList.end(); ++i) {
+            (*i)->update(object, dt);
+        }
+    }
+
+private:
+    typedef std::list<SGSharedPtr<AISubsystem> > SubsystemList;
+    SubsystemList _subsystemList;
+};
+
+} // namespace fgai
+
+#endif