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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  **********************************************************************/