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PolygonExtracter.h

00001 /**********************************************************************
00002  * $Id: PolygonExtracter.h 2772 2009-12-03 19:30:54Z mloskot $
00003  *
00004  * GEOS - Geometry Engine Open Source
00005  * http://geos.refractions.net
00006  *
00007  * Copyright (C) 2001-2002 Vivid Solutions Inc.
00008  * Copyright (C) 2006 Refractions Research Inc.
00009  *
00010  * This is free software; you can redistribute and/or modify it under
00011  * the terms of the GNU Lesser General Public Licence as published
00012  * by the Free Software Foundation. 
00013  * See the COPYING file for more information.
00014  *
00015  **********************************************************************/
00016 
00017 #ifndef GEOS_GEOM_UTIL_POLYGONEXTRACTER_H
00018 #define GEOS_GEOM_UTIL_POLYGONEXTRACTER_H
00019 
00020 #include <geos/export.h>
00021 #include <geos/geom/GeometryFilter.h>
00022 #include <geos/geom/Polygon.h>
00023 #include <geos/platform.h>
00024 #include <vector>
00025 
00026 namespace geos {
00027 namespace geom { // geos.geom
00028 namespace util { // geos.geom.util
00029 
00033 class GEOS_DLL PolygonExtracter: public GeometryFilter {
00034 
00035 public:
00036 
00044         static void getPolygons(const Geometry &geom, std::vector<const Polygon*>& ret)
00045         {
00046                 PolygonExtracter pe(ret);
00047                 geom.apply_ro(&pe);
00048         }
00049 
00054         PolygonExtracter(std::vector<const Polygon*>& newComps)
00055                 :
00056                 comps(newComps)
00057                 {}
00058 
00059         void filter_rw(Geometry *geom) {
00060                 if ( const Polygon *p=dynamic_cast<const Polygon *>(geom) )
00061                 {
00062                         comps.push_back(p);
00063                 }
00064         }
00065 
00066         void filter_ro(const Geometry *geom)
00067         {
00068                 if ( const Polygon *p=dynamic_cast<const Polygon *>(geom) )
00069                 {
00070                         comps.push_back(p);
00071                 }
00072         }
00073 
00074 private:
00075 
00077     std::vector<const Polygon*>& comps;
00078 
00079     // Declare type as noncopyable
00080     PolygonExtracter(const PolygonExtracter& other);
00081     PolygonExtracter& operator=(const PolygonExtracter& rhs);
00082 };
00083 
00084 } // namespace geos.geom.util
00085 } // namespace geos.geom
00086 } // namespace geos
00087 
00088 #endif
00089 
00090 /**********************************************************************
00091  * $Log$
00092  * Revision 1.1  2006/03/09 16:46:49  strk
00093  * geos::geom namespace definition, first pass at headers split
00094  *
00095  **********************************************************************/

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