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GeometryExtracter.h

00001 /**********************************************************************
00002  * $Id$
00003  *
00004  * GEOS - Geometry Engine Open Source
00005  * http://geos.refractions.net
00006  *
00007  * Copyright (C) 2011 Sandro Santilli <strk@keybit.net>
00008  * Copyright (C) 2001-2002 Vivid Solutions Inc.
00009  * Copyright (C) 2006 Refractions Research Inc.
00010  *
00011  * This is free software; you can redistribute and/or modify it under
00012  * the terms of the GNU Lesser General Public Licence as published
00013  * by the Free Software Foundation. 
00014  * See the COPYING file for more information.
00015  *
00016  ********************************************************************** 
00017  *
00018  * Last port: geom/util/GeometryExtracter.java r320 (JTS-1.12)
00019  *
00020  **********************************************************************/
00021 
00022 #ifndef GEOS_GEOM_UTIL_POINTEXTRACTER_H
00023 #define GEOS_GEOM_UTIL_POINTEXTRACTER_H
00024 
00025 #include <geos/export.h>
00026 #include <geos/geom/GeometryFilter.h>
00027 #include <geos/geom/GeometryCollection.h>
00028 #include <geos/platform.h>
00029 #include <vector>
00030 
00031 namespace geos {
00032 namespace geom { // geos.geom
00033 namespace util { // geos.geom.util
00034 
00038 class GEOS_DLL GeometryExtracter {
00039 
00040 public:
00041 
00049   template <class ComponentType, class TargetContainer>
00050   static void extract(const Geometry& geom, TargetContainer& lst)
00051   {
00052     if ( const ComponentType* c = dynamic_cast<const ComponentType*>(&geom) )
00053     {
00054       lst.push_back(c);
00055     }
00056     else if ( const GeometryCollection* c =
00057                    dynamic_cast<const GeometryCollection*>(&geom) )
00058     {
00059       GeometryExtracter::Extracter<ComponentType, TargetContainer> extracter(lst);
00060       c->apply_ro(&extracter);
00061     }
00062   }
00063 
00064 private:
00065 
00066   template <class ComponentType, class TargetContainer>
00067   struct Extracter: public GeometryFilter {
00068 
00074     Extracter(TargetContainer& comps) : comps_(comps) {}
00075 
00076     TargetContainer& comps_;
00077 
00078     void filter_ro(const Geometry* geom)
00079     {
00080       if ( const ComponentType* c = dynamic_cast<const ComponentType*>(geom) ) {
00081         comps_.push_back(c);
00082       }
00083     }
00084 
00085     // Declare type as noncopyable
00086     Extracter(const Extracter& other);
00087     Extracter& operator=(const Extracter& rhs);
00088   };
00089 
00090   // Declare type as noncopyable
00091   GeometryExtracter(const GeometryExtracter& other);
00092   GeometryExtracter& operator=(const GeometryExtracter& rhs);
00093 };
00094 
00095 } // namespace geos.geom.util
00096 } // namespace geos.geom
00097 } // namespace geos
00098 
00099 #endif

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