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/* -*-c++-*- */
/* osgEarth - Dynamic map generation toolkit for OpenSceneGraph
 * Copyright 2008-2013 Pelican Mapping
 * http://osgearth.org
 *
 * osgEarth is free software; you can redistribute it and/or modify
 * it under the terms of the GNU Lesser 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 Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>
 */

#ifndef OSGEARTH_MAP_MODEL_CHANGE_H
#define OSGEARTH_MAP_MODEL_CHANGE_H 1

#include <osgEarth/Common>
#include <osgEarth/Revisioning>
#include <osgEarth/ImageLayer>
#include <osgEarth/ElevationLayer>
#include <osgEarth/ModelLayer>
#include <osgEarth/MaskLayer>

namespace osgEarth
{    
    /**
     * Conveys atomic change actions to the map data model.
     */
    struct MapModelChange /* no export, header-only */
    {
        enum ActionType
        {
            BEGIN_BATCH_UPDATE,               // signals the start of multiple changes
            END_BATCH_UPDATE,                 // signals the end of multiple changes
            ADD_IMAGE_LAYER,
            REMOVE_IMAGE_LAYER,
            MOVE_IMAGE_LAYER,
            ADD_ELEVATION_LAYER,
            REMOVE_ELEVATION_LAYER,
            MOVE_ELEVATION_LAYER,
            TOGGLE_ELEVATION_LAYER,     // visibilty toggle on elevation is a model change.
            ADD_MODEL_LAYER,
            REMOVE_MODEL_LAYER,
            MOVE_MODEL_LAYER,
            ADD_MASK_LAYER,
            REMOVE_MASK_LAYER,
            UNSPECIFIED
        };

        MapModelChange( ActionType action, Revision mapModeRev, Layer* layer =0L, int firstIndex =-1, int secondIndex =-1 ) 
            : _action(action), _layer(layer), _modelRevision(mapModeRev), _firstIndex(firstIndex), _secondIndex(secondIndex) { }

        const ActionType& getAction() const { return _action; }
        const Revision& getRevision() const { return _modelRevision; }
        int getFirstIndex() const { return _firstIndex; }
        int getSecondIndex() const { return _secondIndex; }
        Layer* getLayer() const { return _layer.get(); }
        ImageLayer* getImageLayer() const { return dynamic_cast<ImageLayer*>(_layer.get()); }
        ElevationLayer* getElevationLayer() const { return dynamic_cast<ElevationLayer*>(_layer.get()); }
        ModelLayer* getModelLayer() const { return dynamic_cast<ModelLayer*>(_layer.get()); }
        MaskLayer* getMaskLayer() const { return dynamic_cast<MaskLayer*>(_layer.get()); }

    private:
        ActionType          _action;
        osg::ref_ptr<Layer> _layer;
        Revision            _modelRevision;
        int                 _firstIndex, _secondIndex;
    };
}

#endif // OSGEARTH_MAP_MODEL_CHANGE_H