/home/cube/sources/osgearth/src/osgEarthDrivers/feature_ogr/FeatureCursorOGR

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/* -*-c++-*- */
/* osgEarth - Dynamic map generation toolkit for OpenSceneGraph
 * Copyright 2008-2010 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 OSGEARTHFEATURES_FEATURE_CURSOR_OGR
#define OSGEARTHFEATURES_FEATURE_CURSOR_OGR 1

#include <osgEarthFeatures/Feature>
#include <osgEarthFeatures/FeatureSource>
#include <osgEarthFeatures/Filter>
#include <osgEarthSymbology/Query>
#include <ogr_api.h>
#include <queue>

using namespace osgEarth;
using namespace osgEarth::Features;

class FeatureCursorOGR : public FeatureCursor
{
public:
    FeatureCursorOGR(
        OGRLayerH dsHandle,
        OGRLayerH layerHandle,
        const FeatureProfile* profile,
        const Symbology::Query& query,
        const FeatureFilterList& filters );

public: // FeatureCursor

    bool hasMore() const;
    Feature* nextFeature();

protected:
    virtual ~FeatureCursorOGR();

private:
    OGRDataSourceH _dsHandle;
    OGRLayerH _layerHandle;
    OGRLayerH _resultSetHandle;
    OGRGeometryH _spatialFilter;
    Symbology::Query _query;
    int _chunkSize;
    OGRFeatureH _nextHandleToQueue;
    osg::ref_ptr<const FeatureProfile> _profile;
    std::queue< osg::ref_ptr<Feature> > _queue;
    osg::ref_ptr<Feature> _lastFeatureReturned;
    const FeatureFilterList& _filters;

private:
    void readChunk();    
};


#endif // OSGEARTHFEATURES_FEATURE_CURSOR_OGR