GEOS  3.3.3
PolygonExtracter.h
1 /**********************************************************************
2  * $Id: PolygonExtracter.h 2772 2009-12-03 19:30:54Z mloskot $
3  *
4  * GEOS - Geometry Engine Open Source
5  * http://geos.refractions.net
6  *
7  * Copyright (C) 2001-2002 Vivid Solutions Inc.
8  * Copyright (C) 2006 Refractions Research Inc.
9  *
10  * This is free software; you can redistribute and/or modify it under
11  * the terms of the GNU Lesser General Public Licence as published
12  * by the Free Software Foundation.
13  * See the COPYING file for more information.
14  *
15  **********************************************************************/
16 
17 #ifndef GEOS_GEOM_UTIL_POLYGONEXTRACTER_H
18 #define GEOS_GEOM_UTIL_POLYGONEXTRACTER_H
19 
20 #include <geos/export.h>
21 #include <geos/geom/GeometryFilter.h>
22 #include <geos/geom/Polygon.h>
23 #include <geos/platform.h>
24 #include <vector>
25 
26 namespace geos {
27 namespace geom { // geos.geom
28 namespace util { // geos.geom.util
29 
33 class GEOS_DLL PolygonExtracter: public GeometryFilter {
34 
35 public:
36 
44  static void getPolygons(const Geometry &geom, std::vector<const Polygon*>& ret)
45  {
46  PolygonExtracter pe(ret);
47  geom.apply_ro(&pe);
48  }
49 
54  PolygonExtracter(std::vector<const Polygon*>& newComps)
55  :
56  comps(newComps)
57  {}
58 
59  void filter_rw(Geometry *geom) {
60  if ( const Polygon *p=dynamic_cast<const Polygon *>(geom) )
61  {
62  comps.push_back(p);
63  }
64  }
65 
66  void filter_ro(const Geometry *geom)
67  {
68  if ( const Polygon *p=dynamic_cast<const Polygon *>(geom) )
69  {
70  comps.push_back(p);
71  }
72  }
73 
74 private:
75 
77  std::vector<const Polygon*>& comps;
78 
79  // Declare type as noncopyable
80  PolygonExtracter(const PolygonExtracter& other);
81  PolygonExtracter& operator=(const PolygonExtracter& rhs);
82 };
83 
84 } // namespace geos.geom.util
85 } // namespace geos.geom
86 } // namespace geos
87 
88 #endif
89 
90 /**********************************************************************
91  * $Log$
92  * Revision 1.1 2006/03/09 16:46:49 strk
93  * geos::geom namespace definition, first pass at headers split
94  *
95  **********************************************************************/