GEOS 3.9.1
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#ifndef GEOS_GEOM_UTIL_GEOMETRYEXTRACTER_H
22#define GEOS_GEOM_UTIL_GEOMETRYEXTRACTER_H
23
24#include <geos/export.h>
25#include <geos/geom/GeometryFilter.h>
26#include <geos/geom/GeometryCollection.h>
27#include <vector>
28
29namespace geos {
30namespace geom { // geos.geom
31namespace util { // geos.geom.util
32
36class GEOS_DLL GeometryExtracter {
37
38public:
39
47 template <class ComponentType, class TargetContainer>
48 static void
49 extract(const Geometry& geom, TargetContainer& lst)
50 {
51 if(const ComponentType* p_c = dynamic_cast<const ComponentType*>(&geom)) {
52 lst.push_back(p_c);
53 }
54 else if(const GeometryCollection* p_c1 =
55 dynamic_cast<const GeometryCollection*>(&geom)) {
56 GeometryExtracter::Extracter<ComponentType, TargetContainer> extracter(lst);
57 p_c1->apply_ro(&extracter);
58 }
59 }
60
61private:
62
63 template <class ComponentType, class TargetContainer>
64 struct Extracter: public GeometryFilter {
65
71 Extracter(TargetContainer& comps) : comps_(comps) {}
72
73 TargetContainer& comps_;
74
75 void
76 filter_ro(const Geometry* geom) override
77 {
78 if(const ComponentType* c = dynamic_cast<const ComponentType*>(geom)) {
79 comps_.push_back(c);
80 }
81 }
82
83 // Declare type as noncopyable
84 Extracter(const Extracter& other);
85 Extracter& operator=(const Extracter& rhs);
86 };
87
88 // Declare type as noncopyable
89 GeometryExtracter(const GeometryExtracter& other) = delete;
90 GeometryExtracter& operator=(const GeometryExtracter& rhs) = delete;
91};
92
93} // namespace geos.geom.util
94} // namespace geos.geom
95} // namespace geos
96
97#endif
Represents a collection of heterogeneous Geometry objects.
Definition GeometryCollection.h:55
Geometry classes support the concept of applying a Geometry filter to the Geometry.
Definition GeometryFilter.h:47
Basic implementation of Geometry, constructed and destructed by GeometryFactory.
Definition Geometry.h:188
Definition GeometryExtracter.h:36
static void extract(const Geometry &geom, TargetContainer &lst)
Definition GeometryExtracter.h:49
Basic namespace for all GEOS functionalities.
Definition IndexedNestedRingTester.h:26