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UnaryUnionOp.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 *
9 * This is free software; you can redistribute and/or modify it under
10 * the terms of the GNU Lesser General Public Licence as published
11 * by the Free Software Foundation.
12 * See the COPYING file for more information.
13 *
14 **********************************************************************
15 *
16 * Last port: operation/union/UnaryUnionOp.java r320 (JTS-1.12)
17 *
18 **********************************************************************/
19
20 #ifndef GEOS_OP_UNION_UNARYUNION_H
21 #define GEOS_OP_UNION_UNARYUNION_H
22
23 #include <memory>
24 #include <vector>
25
26 #include <geos/export.h>
27 #include <geos/geom/GeometryFactory.h>
28 #include <geos/geom/BinaryOp.h>
29 #include <geos/geom/Point.h>
30 #include <geos/geom/LineString.h>
31 #include <geos/geom/Polygon.h>
32 #include <geos/geom/util/GeometryExtracter.h>
33 #include <geos/operation/overlay/OverlayOp.h>
34 //#include <geos/operation/overlay/snap/SnapIfNeededOverlayOp.h>
35
36 #ifdef _MSC_VER
37 #pragma warning(push)
38 #pragma warning(disable: 4251) // warning C4251: needs to have dll-interface to be used by clients of class
39 #endif
40
41 // Forward declarations
42 namespace geos {
43 namespace geom {
44 class GeometryFactory;
45 class Geometry;
46 }
47 }
48
49 namespace geos {
50 namespace operation { // geos::operation
51 namespace geounion { // geos::operation::geounion
52
86 class GEOS_DLL UnaryUnionOp
87 {
88 public:
89
90 template <typename T>
91 static std::auto_ptr<geom::Geometry> Union(const T& geoms)
92 {
93 UnaryUnionOp op(geoms);
94 return op.Union();
95 }
96
97 template <class T>
98 static std::auto_ptr<geom::Geometry> Union(const T& geoms,
99 geom::GeometryFactory& geomFact)
100 {
101 UnaryUnionOp op(geoms, geomFact);
102 return op.Union();
103 }
104
105 static std::auto_ptr<geom::Geometry> Union(const geom::Geometry& geom)
106 {
107 UnaryUnionOp op(geom);
108 return op.Union();
109 }
110
111 template <class T>
112 UnaryUnionOp(const T& geoms, geom::GeometryFactory& geomFactIn)
113 :
114 geomFact(&geomFactIn)
115 {
116 extractGeoms(geoms);
117 }
118
119 template <class T>
120 UnaryUnionOp(const T& geoms)
121 :
122 geomFact(0)
123 {
124 extractGeoms(geoms);
125 }
126
127 UnaryUnionOp(const geom::Geometry& geom)
128 :
129 geomFact(geom.getFactory())
130 {
131 extract(geom);
132 }
133
144 std::auto_ptr<geom::Geometry> Union();
145
146 private:
147
148 template <typename T>
149 void extractGeoms(const T& geoms)
150 {
151 for (typename T::const_iterator
152 i=geoms.begin(),
153 e=geoms.end();
154 i!=e;
155 ++i)
156 {
157 const geom::Geometry* geom = *i;
158 extract(*geom);
159 }
160 }
161
162 void extract(const geom::Geometry& geom)
163 {
164 using namespace geom::util;
165
166 if ( ! geomFact ) geomFact = geom.getFactory();
167
168 GeometryExtracter::extract<geom::Polygon>(geom, polygons);
169 GeometryExtracter::extract<geom::LineString>(geom, lines);
170 GeometryExtracter::extract<geom::Point>(geom, points);
171 }
172
185 std::auto_ptr<geom::Geometry> unionNoOpt(const geom::Geometry& g0)
186 {
187 using geos::operation::overlay::OverlayOp;
188 //using geos::operation::overlay::snap::SnapIfNeededOverlayOp;
189
190 if ( ! empty.get() ) {
191 empty.reset( geomFact->createEmptyGeometry() );
192 }
193 //return SnapIfNeededOverlayOp::overlayOp(g0, *empty, OverlayOp::opUNION);
194 return BinaryOp(&g0, empty.get(), overlay::overlayOp(OverlayOp::opUNION));
195 }
196
206 std::auto_ptr<geom::Geometry> unionWithNull(std::auto_ptr<geom::Geometry> g0,
207 std::auto_ptr<geom::Geometry> g1);
208
209 std::vector<const geom::Polygon*> polygons;
210 std::vector<const geom::LineString*> lines;
211 std::vector<const geom::Point*> points;
212
213 const geom::GeometryFactory* geomFact;
214
215 std::auto_ptr<geom::Geometry> empty;
216 };
217
218
219 } // namespace geos::operation::union
220 } // namespace geos::operation
221 } // namespace geos
222
223 #ifdef _MSC_VER
224 #pragma warning(pop)
225 #endif
226
227 #endif