LinearComponentExtracter.h

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_LINEARCOMPONENTEXTRACTER_H
00017 #define GEOS_GEOM_UTIL_LINEARCOMPONENTEXTRACTER_H
00018 
00019 
00020 #include <geos/export.h>
00021 #include <vector>
00022 
00023 #include <geos/geom/GeometryComponentFilter.h>
00024 #include <geos/geom/Geometry.h> // to be removed when we have the .inl
00025 #include <geos/geom/LineString.h> // to be removed when we have the .inl
00026 //#include <geos/platform.h>
00027 
00028 namespace geos {
00029 namespace geom { // geos.geom
00030 namespace util { // geos.geom.util
00031 
00035 class GEOS_DLL LinearComponentExtracter: public GeometryComponentFilter {
00036 
00037 private:
00038 
00039         LineString::ConstVect &comps;
00040 
00041     // Declare type as noncopyable
00042     LinearComponentExtracter(const LinearComponentExtracter& other);
00043     LinearComponentExtracter& operator=(const LinearComponentExtracter& rhs);
00044 
00045 public:
00053         static void getLines(const Geometry &geom, std::vector<const LineString*> &ret)
00054         {
00055                 LinearComponentExtracter lce(ret);
00056                 geom.apply_ro(&lce);
00057         }
00058 
00063         LinearComponentExtracter(std::vector<const LineString*> &newComps)
00064                 :
00065                 comps(newComps)
00066                 {}
00067 
00068         void filter_rw(Geometry *geom)
00069         {
00070 if ( const LineString *ls=dynamic_cast<const LineString *>(geom) )
00071                 comps.push_back(ls);
00072         }
00073 
00074         void filter_ro(const Geometry *geom)
00075         {
00076 if ( const LineString *ls=dynamic_cast<const LineString *>(geom) )
00077                 comps.push_back(ls);
00078         }
00079 
00080 };
00081 
00082 } // namespace geos.geom.util
00083 } // namespace geos.geom
00084 } // namespace geos
00085 
00086 #endif

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