GeometryExtracter.h

00001 /**********************************************************************
00002  *
00003  * GEOS - Geometry Engine Open Source
00004  * http://geos.osgeo.org
00005  *
00006  * Copyright (C) 2011 Sandro Santilli <strk@keybit.net>
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  * Last port: geom/util/GeometryExtracter.java r320 (JTS-1.12)
00018  *
00019  **********************************************************************/
00020 
00021 #ifndef GEOS_GEOM_UTIL_GEOMETRYEXTRACTER_H
00022 #define GEOS_GEOM_UTIL_GEOMETRYEXTRACTER_H
00023 
00024 #include <geos/export.h>
00025 #include <geos/geom/GeometryFilter.h>
00026 #include <geos/geom/GeometryCollection.h>
00027 #include <geos/platform.h>
00028 #include <vector>
00029 
00030 namespace geos {
00031 namespace geom { // geos.geom
00032 namespace util { // geos.geom.util
00033 
00037 class GEOS_DLL GeometryExtracter {
00038 
00039 public:
00040 
00048   template <class ComponentType, class TargetContainer>
00049   static void extract(const Geometry& geom, TargetContainer& lst)
00050   {
00051     if ( const ComponentType* c = dynamic_cast<const ComponentType*>(&geom) )
00052     {
00053       lst.push_back(c);
00054     }
00055     else if ( const GeometryCollection* c =
00056                    dynamic_cast<const GeometryCollection*>(&geom) )
00057     {
00058       GeometryExtracter::Extracter<ComponentType, TargetContainer> extracter(lst);
00059       c->apply_ro(&extracter);
00060     }
00061   }
00062 
00063 private:
00064 
00065   template <class ComponentType, class TargetContainer>
00066   struct Extracter: public GeometryFilter {
00067 
00073     Extracter(TargetContainer& comps) : comps_(comps) {}
00074 
00075     TargetContainer& comps_;
00076 
00077     void filter_ro(const Geometry* geom)
00078     {
00079       if ( const ComponentType* c = dynamic_cast<const ComponentType*>(geom) ) {
00080         comps_.push_back(c);
00081       }
00082     }
00083 
00084     // Declare type as noncopyable
00085     Extracter(const Extracter& other);
00086     Extracter& operator=(const Extracter& rhs);
00087   };
00088 
00089   // Declare type as noncopyable
00090   GeometryExtracter(const GeometryExtracter& other);
00091   GeometryExtracter& operator=(const GeometryExtracter& rhs);
00092 };
00093 
00094 } // namespace geos.geom.util
00095 } // namespace geos.geom
00096 } // namespace geos
00097 
00098 #endif

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