GEOS  3.3.3
GeometryExtracter.h
1 /**********************************************************************
2  * $Id$
3  *
4  * GEOS - Geometry Engine Open Source
5  * http://geos.refractions.net
6  *
7  * Copyright (C) 2011 Sandro Santilli <strk@keybit.net>
8  * Copyright (C) 2001-2002 Vivid Solutions Inc.
9  * Copyright (C) 2006 Refractions Research Inc.
10  *
11  * This is free software; you can redistribute and/or modify it under
12  * the terms of the GNU Lesser General Public Licence as published
13  * by the Free Software Foundation.
14  * See the COPYING file for more information.
15  *
16  **********************************************************************
17  *
18  * Last port: geom/util/GeometryExtracter.java r320 (JTS-1.12)
19  *
20  **********************************************************************/
21 
22 #ifndef GEOS_GEOM_UTIL_POINTEXTRACTER_H
23 #define GEOS_GEOM_UTIL_POINTEXTRACTER_H
24 
25 #include <geos/export.h>
26 #include <geos/geom/GeometryFilter.h>
27 #include <geos/geom/GeometryCollection.h>
28 #include <geos/platform.h>
29 #include <vector>
30 
31 namespace geos {
32 namespace geom { // geos.geom
33 namespace util { // geos.geom.util
34 
38 class GEOS_DLL GeometryExtracter {
39 
40 public:
41 
49  template <class ComponentType, class TargetContainer>
50  static void extract(const Geometry& geom, TargetContainer& lst)
51  {
52  if ( const ComponentType* c = dynamic_cast<const ComponentType*>(&geom) )
53  {
54  lst.push_back(c);
55  }
56  else if ( const GeometryCollection* c =
57  dynamic_cast<const GeometryCollection*>(&geom) )
58  {
59  GeometryExtracter::Extracter<ComponentType, TargetContainer> extracter(lst);
60  c->apply_ro(&extracter);
61  }
62  }
63 
64 private:
65 
66  template <class ComponentType, class TargetContainer>
67  struct Extracter: public GeometryFilter {
68 
74  Extracter(TargetContainer& comps) : comps_(comps) {}
75 
76  TargetContainer& comps_;
77 
78  void filter_ro(const Geometry* geom)
79  {
80  if ( const ComponentType* c = dynamic_cast<const ComponentType*>(geom) ) {
81  comps_.push_back(c);
82  }
83  }
84 
85  // Declare type as noncopyable
86  Extracter(const Extracter& other);
87  Extracter& operator=(const Extracter& rhs);
88  };
89 
90  // Declare type as noncopyable
91  GeometryExtracter(const GeometryExtracter& other);
92  GeometryExtracter& operator=(const GeometryExtracter& rhs);
93 };
94 
95 } // namespace geos.geom.util
96 } // namespace geos.geom
97 } // namespace geos
98 
99 #endif