LinearComponentExtracter.h

00001 /**********************************************************************
00002  * $Id: LinearComponentExtracter.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_LINEARCOMPONENTEXTRACTER_H
00018 #define GEOS_GEOM_UTIL_LINEARCOMPONENTEXTRACTER_H
00019 
00020 #include <vector>
00021 
00022 #include <geos/geom/GeometryComponentFilter.h>
00023 #include <geos/geom/Geometry.h> // to be removed when we have the .inl
00024 #include <geos/geom/LineString.h> // to be removed when we have the .inl
00025 //#include <geos/platform.h>
00026 
00027 namespace geos {
00028 namespace geom { // geos.geom
00029 namespace util { // geos.geom.util
00030 
00034 class LinearComponentExtracter: public GeometryComponentFilter {
00035 
00036 private:
00037 
00038         LineString::ConstVect &comps;
00039 
00040 public:
00048         static void getLines(const Geometry &geom, std::vector<const LineString*> &ret)
00049         {
00050                 LinearComponentExtracter lce(ret);
00051                 geom.apply_ro(&lce);
00052         }
00053 
00058         LinearComponentExtracter(std::vector<const LineString*> &newComps)
00059                 :
00060                 comps(newComps)
00061                 {}
00062 
00063         void filter_rw(Geometry *geom)
00064         {
00065 if ( const LineString *ls=dynamic_cast<const LineString *>(geom) )
00066                 comps.push_back(ls);
00067         }
00068 
00069         void filter_ro(const Geometry *geom)
00070         {
00071 if ( const LineString *ls=dynamic_cast<const LineString *>(geom) )
00072                 comps.push_back(ls);
00073         }
00074 
00075 };
00076 
00077 } // namespace geos.geom.util
00078 } // namespace geos.geom
00079 } // namespace geos
00080 
00081 #endif
00082 
00083 /**********************************************************************
00084  * $Log$
00085  * Revision 1.1  2006/03/09 16:46:49  strk
00086  * geos::geom namespace definition, first pass at headers split
00087  *
00088  **********************************************************************/

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