PolygonExtracter.h

/**********************************************************************
 * $Id: PolygonExtracter.h 2556 2009-06-06 22:22:28Z strk $
 *
 * GEOS - Geometry Engine Open Source
 * http://geos.refractions.net
 *
 * Copyright (C) 2001-2002 Vivid Solutions Inc.
 * Copyright (C) 2006 Refractions Research Inc.
 *
 * This is free software; you can redistribute and/or modify it under
 * the terms of the GNU Lesser General Public Licence as published
 * by the Free Software Foundation. 
 * See the COPYING file for more information.
 *
 **********************************************************************/

#ifndef GEOS_GEOM_UTIL_POLYGONEXTRACTER_H
#define GEOS_GEOM_UTIL_POLYGONEXTRACTER_H

#include <geos/export.h>
#include <geos/geom/GeometryFilter.h>
#include <geos/geom/Polygon.h>
#include <geos/platform.h>
#include <vector>

namespace geos {
namespace geom { // geos.geom
namespace util { // geos.geom.util

class GEOS_DLL PolygonExtracter: public GeometryFilter {

private:

        std::vector<const Polygon*>& comps;

public:

        static void getPolygons(const Geometry &geom, std::vector<const Polygon*>& ret)
        {
                PolygonExtracter pe(ret);
                geom.apply_ro(&pe);
        }

        PolygonExtracter(std::vector<const Polygon*>& newComps)
                :
                comps(newComps)
                {}

        void filter_rw(Geometry *geom) {
                if ( const Polygon *p=dynamic_cast<const Polygon *>(geom) )
                {
                        comps.push_back(p);
                }
        }

        void filter_ro(const Geometry *geom)
        {
                if ( const Polygon *p=dynamic_cast<const Polygon *>(geom) )
                {
                        comps.push_back(p);
                }
        }

};

} // namespace geos.geom.util
} // namespace geos.geom
} // namespace geos

#endif

/**********************************************************************
 * $Log$
 * Revision 1.1  2006/03/09 16:46:49  strk
 * geos::geom namespace definition, first pass at headers split
 *
 **********************************************************************/

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