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+// Copyright (C) 2009 - 2012  Mathias Froehlich - Mathias.Froehlich@web.de
+//
+// This library is free software; you can redistribute it and/or
+// modify it under the terms of the GNU Library General Public
+// License as published by the Free Software Foundation; either
+// version 2 of the License, or (at your option) any later version.
+//
+// This library 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
+// Library 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 HLAViewerFederate_hxx
+#define HLAViewerFederate_hxx
+
+#include <osg/ref_ptr>
+#include <osg/observer_ptr>
+#include <osg/Group>
+#include <osg/Node>
+#include <osgDB/Options>
+
+#include <simgear/hla/HLAFederate.hxx>
+
+#include "HLASceneObjectClass.hxx"
+#include "HLAView.hxx"
+#include "HLAViewClass.hxx"
+#include "HLAPerspectiveViewer.hxx"
+#include "HLAPerspectiveViewerClass.hxx"
+#include "HLAMPAircraftClass.hxx"
+
+namespace fgviewer {
+
+class Viewer;
+
+class HLAViewerFederate : public simgear::HLAFederate {
+public:
+    HLAViewerFederate();
+    virtual ~HLAViewerFederate();
+
+    const HLAPerspectiveViewer* getViewer() const;
+    HLAPerspectiveViewer* getViewer();
+    void setViewer(HLAPerspectiveViewer* viewer);
+
+    const HLAView* getView() const;
+    HLAView* getView();
+    void setView(HLAView* view);
+
+    virtual simgear::HLAObjectClass* createObjectClass(const std::string& name);
+
+    virtual bool init();
+    virtual bool update();
+    virtual bool shutdown();
+
+    /// The node containing all the dynamic models attached to this viewer
+    osg::Node* getDynamicModelNode();
+    void addDynamicModel(osg::Node* node);
+    void removeDynamicModel(osg::Node* node);
+
+    /// Dynamic models use this options struct for loading/paging
+    osg::ref_ptr<const osgDB::Options> getReaderWriterOptions() const;
+
+    /// Called by the viewer.
+    void attachToViewer(Viewer* viewer);
+
+    /// Temporary application management
+    void insertView(HLAView* view);
+    void eraseView(HLAView* view);
+
+private:
+    /// Explicitly known object classes
+    SGSharedPtr<HLAPerspectiveViewerClass> _perspectiveViewerClass;
+    SGSharedPtr<HLAViewClass> _viewClass;
+
+    /// The perspective viewer of this viewer federate. FIXME: also allow orthographic viewers for instruments!
+    SGSharedPtr<HLAPerspectiveViewer> _perspectiveViewer;
+
+    /// The default absolute view
+    SGSharedPtr<HLAView> _defaultView;
+
+    /// A list of all available views
+    typedef std::list<SGSharedPtr<HLAView> > ViewList;
+    ViewList _viewList;
+
+    /// The openscenegraphs side of this component
+    osg::ref_ptr<osg::Group> _group;
+
+    /// The backward reference to the viewer
+    osg::observer_ptr<Viewer> _viewer;
+};
+
+} // namespace fgviewer
+
+#endif