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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