PolygonExtracter.h

00001 /**********************************************************************
00002  * $Id: PolygonExtracter.h 1820 2006-09-06 16:54:23Z 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/geom/GeometryFilter.h>
00021 #include <geos/geom/Polygon.h>
00022 #include <geos/platform.h>
00023 #include <vector>
00024 
00025 namespace geos {
00026 namespace geom { // geos.geom
00027 namespace util { // geos.geom.util
00028 
00032 class PolygonExtracter: public GeometryFilter {
00033 
00034 private:
00035 
00037         std::vector<const Polygon*>& comps;
00038 
00039 public:
00040 
00048         static void getPolygons(const Geometry &geom, std::vector<const Polygon*>& ret)
00049         {
00050                 PolygonExtracter pe(ret);
00051                 geom.apply_ro(&pe);
00052         }
00053 
00058         PolygonExtracter(std::vector<const Polygon*>& newComps)
00059                 :
00060                 comps(newComps)
00061                 {}
00062 
00063         void filter_rw(Geometry *geom) {
00064                 if ( const Polygon *p=dynamic_cast<const Polygon *>(geom) )
00065                 {
00066                         comps.push_back(p);
00067                 }
00068         }
00069 
00070         void filter_ro(const Geometry *geom)
00071         {
00072                 if ( const Polygon *p=dynamic_cast<const Polygon *>(geom) )
00073                 {
00074                         comps.push_back(p);
00075                 }
00076         }
00077 
00078 };
00079 
00080 } // namespace geos.geom.util
00081 } // namespace geos.geom
00082 } // namespace geos
00083 
00084 #endif
00085 
00086 /**********************************************************************
00087  * $Log$
00088  * Revision 1.1  2006/03/09 16:46:49  strk
00089  * geos::geom namespace definition, first pass at headers split
00090  *
00091  **********************************************************************/

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