GEOS
3.4.2
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00001 /********************************************************************** 00002 * 00003 * GEOS - Geometry Engine Open Source 00004 * http://geos.osgeo.org 00005 * 00006 * Copyright (C) 2001-2002 Vivid Solutions Inc. 00007 * Copyright (C) 2006 Refractions Research Inc. 00008 * 00009 * This is free software; you can redistribute and/or modify it under 00010 * the terms of the GNU Lesser General Public Licence as published 00011 * by the Free Software Foundation. 00012 * See the COPYING file for more information. 00013 * 00014 **********************************************************************/ 00015 00016 #ifndef GEOS_GEOM_UTIL_POLYGONEXTRACTER_H 00017 #define GEOS_GEOM_UTIL_POLYGONEXTRACTER_H 00018 00019 #include <geos/export.h> 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 GEOS_DLL PolygonExtracter: public GeometryFilter { 00033 00034 public: 00035 00043 static void getPolygons(const Geometry &geom, std::vector<const Polygon*>& ret) 00044 { 00045 PolygonExtracter pe(ret); 00046 geom.apply_ro(&pe); 00047 } 00048 00053 PolygonExtracter(std::vector<const Polygon*>& newComps) 00054 : 00055 comps(newComps) 00056 {} 00057 00058 void filter_rw(Geometry *geom) { 00059 if ( const Polygon *p=dynamic_cast<const Polygon *>(geom) ) 00060 { 00061 comps.push_back(p); 00062 } 00063 } 00064 00065 void filter_ro(const Geometry *geom) 00066 { 00067 if ( const Polygon *p=dynamic_cast<const Polygon *>(geom) ) 00068 { 00069 comps.push_back(p); 00070 } 00071 } 00072 00073 private: 00074 00076 std::vector<const Polygon*>& comps; 00077 00078 // Declare type as noncopyable 00079 PolygonExtracter(const PolygonExtracter& other); 00080 PolygonExtracter& operator=(const PolygonExtracter& rhs); 00081 }; 00082 00083 } // namespace geos.geom.util 00084 } // namespace geos.geom 00085 } // namespace geos 00086 00087 #endif