GEOS  3.13.0dev
GeometryExtracter.h
1 /**********************************************************************
2  *
3  * GEOS - Geometry Engine Open Source
4  * http://geos.osgeo.org
5  *
6  * Copyright (C) 2011 Sandro Santilli <strk@kbt.io>
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  * Last port: geom/util/GeometryExtracter.java r320 (JTS-1.12)
18  *
19  **********************************************************************/
20 
21 #pragma once
22 
23 #include <geos/export.h>
24 #include <geos/geom/GeometryFilter.h>
25 #include <geos/geom/GeometryCollection.h>
26 #include <vector>
27 
28 namespace geos {
29 namespace geom { // geos.geom
30 namespace util { // geos.geom.util
31 
35 class GEOS_DLL GeometryExtracter {
36 
37 public:
38 
46  template <class ComponentType, class TargetContainer>
47  static void
48  extract(const Geometry& geom, TargetContainer& lst)
49  {
50  if(const ComponentType* p_c = dynamic_cast<const ComponentType*>(&geom)) {
51  lst.push_back(p_c);
52  }
53  else if(const GeometryCollection* p_c1 =
54  dynamic_cast<const GeometryCollection*>(&geom)) {
55  GeometryExtracter::Extracter<ComponentType, TargetContainer> extracter(lst);
56  p_c1->apply_ro(&extracter);
57  }
58  }
59 
60 private:
61 
62  template <class ComponentType, class TargetContainer>
63  struct Extracter: public GeometryFilter {
64 
70  Extracter(TargetContainer& comps) : comps_(comps) {}
71 
72  TargetContainer& comps_;
73 
74  void
75  filter_ro(const Geometry* geom) override
76  {
77  if(const ComponentType* c = dynamic_cast<const ComponentType*>(geom)) {
78  comps_.push_back(c);
79  }
80  }
81 
82  // Declare type as noncopyable
83  Extracter(const Extracter& other);
84  Extracter& operator=(const Extracter& rhs);
85  };
86 
87  // Declare type as noncopyable
88  GeometryExtracter(const GeometryExtracter& other) = delete;
89  GeometryExtracter& operator=(const GeometryExtracter& rhs) = delete;
90 };
91 
92 } // namespace geos.geom.util
93 } // namespace geos.geom
94 } // namespace geos
95 
Represents a collection of heterogeneous Geometry objects.
Definition: GeometryCollection.h:51
Geometry classes support the concept of applying a Geometry filter to the Geometry.
Definition: GeometryFilter.h:45
Basic implementation of Geometry, constructed and destructed by GeometryFactory.
Definition: Geometry.h:186
Definition: GeometryExtracter.h:35
static void extract(const Geometry &geom, TargetContainer &lst)
Definition: GeometryExtracter.h:48
Basic namespace for all GEOS functionalities.
Definition: Angle.h:25