GEOS: UnaryUnionOp.h Source File

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# UnaryUnionOp.h

    00001 /**********************************************************************
    00002  * $Id$
    00003  *
    00004  * GEOS - Geometry Engine Open Source
    00005  * http://geos.refractions.net
    00006  *
    00007  * Copyright (C) 2011 Sandro Santilli <strk@keybit.net>
    00008  *
    00009  * This is free software; you can redistribute and/or modify it under
    00010  * the terms of the GNU Lesser General Public Licence as published
    00011  * by the Free Software Foundation.
    00012  * See the COPYING file for more information.
    00013  *
    00014  **********************************************************************
    00015  *
    00016  * Last port: operation/union/UnaryUnionOp.java r320 (JTS-1.12)
    00017  *
    00018  **********************************************************************/
    00019
    00020 #ifndef GEOS_OP_UNION_UNARYUNION_H
    00021 #define GEOS_OP_UNION_UNARYUNION_H
    00022
    00023 #include <memory>
    00024 #include <vector>
    00025
    00026 #include <geos/export.h>
    00027 #include <geos/geom/GeometryFactory.h>
    00028 #include <geos/geom/BinaryOp.h>
    00029 #include <geos/geom/Point.h>
    00030 #include <geos/geom/LineString.h>
    00031 #include <geos/geom/Polygon.h>
    00032 #include <geos/geom/util/GeometryExtracter.h>
    00033 #include <geos/operation/overlay/OverlayOp.h>
    00034 //#include <geos/operation/overlay/snap/SnapIfNeededOverlayOp.h>
    00035
    00036 #ifdef _MSC_VER
    00037 #pragma warning(push)
    00038 #pragma warning(disable: 4251) // warning C4251: needs to have dll-interface to be used by clients of class
    00039 #endif
    00040
    00041 // Forward declarations
    00042 namespace geos {
    00043     namespace geom {
    00044         class GeometryFactory;
    00045         class Geometry;
    00046     }
    00047 }
    00048
    00049 namespace geos {
    00050 namespace operation { // geos::operation
    00051 namespace geounion {  // geos::operation::geounion
    00052
    00086 class GEOS_DLL UnaryUnionOp
    00087 {
    00088 public:
    00089
    00090   template <typename T>
    00091   static std::auto_ptr<geom::Geometry> Union(const T& geoms)
    00092   {
    00093     UnaryUnionOp op(geoms);
    00094     return op.Union();
    00095   }
    00096
    00097   template <class T>
    00098   static std::auto_ptr<geom::Geometry> Union(const T& geoms,
    00099       geom::GeometryFactory& geomFact)
    00100   {
    00101     UnaryUnionOp op(geoms, geomFact);
    00102     return op.Union();
    00103   }
    00104
    00105   static std::auto_ptr<geom::Geometry> Union(const geom::Geometry& geom)
    00106   {
    00107     UnaryUnionOp op(geom);
    00108     return op.Union();
    00109   }
    00110
    00111   template <class T>
    00112   UnaryUnionOp(const T& geoms, geom::GeometryFactory& geomFactIn)
    00113       :
    00114       geomFact(&geomFactIn)
    00115   {
    00116     extractGeoms(geoms);
    00117   }
    00118
    00119   template <class T>
    00120   UnaryUnionOp(const T& geoms)
    00121       :
    00122       geomFact(0)
    00123   {
    00124     extractGeoms(geoms);
    00125   }
    00126
    00127   UnaryUnionOp(const geom::Geometry& geom)
    00128       :
    00129       geomFact(geom.getFactory())
    00130   {
    00131     extract(geom);
    00132   }
    00133
    00144   std::auto_ptr<geom::Geometry> Union();
    00145
    00146 private:
    00147
    00148   template <typename T>
    00149   void extractGeoms(const T& geoms)
    00150   {
    00151       for (typename T::const_iterator
    00152               i=geoms.begin(),
    00153               e=geoms.end();
    00154               i!=e;
    00155               ++i)
    00156       {
    00157           const geom::Geometry* geom = *i;
    00158           extract(*geom);
    00159       }
    00160   }
    00161
    00162   void extract(const geom::Geometry& geom)
    00163   {
    00164       using namespace geom::util;
    00165
    00166       if ( ! geomFact ) geomFact = geom.getFactory();
    00167
    00168       GeometryExtracter::extract<geom::Polygon>(geom, polygons);
    00169       GeometryExtracter::extract<geom::LineString>(geom, lines);
    00170       GeometryExtracter::extract<geom::Point>(geom, points);
    00171   }
    00172
    00185   std::auto_ptr<geom::Geometry> unionNoOpt(const geom::Geometry& g0)
    00186   {
    00187     using geos::operation::overlay::OverlayOp;
    00188     //using geos::operation::overlay::snap::SnapIfNeededOverlayOp;
    00189
    00190     if ( ! empty.get() ) {
    00191       empty.reset( geomFact->createEmptyGeometry() );
    00192     }
    00193     //return SnapIfNeededOverlayOp::overlayOp(g0, *empty, OverlayOp::opUNION);
    00194     return BinaryOp(&g0, empty.get(), overlay::overlayOp(OverlayOp::opUNION));
    00195   }
    00196
    00206   std::auto_ptr<geom::Geometry> unionWithNull(std::auto_ptr<geom::Geometry> g0,
    00207                                               std::auto_ptr<geom::Geometry> g1);
    00208
    00209   std::vector<const geom::Polygon*> polygons;
    00210   std::vector<const geom::LineString*> lines;
    00211   std::vector<const geom::Point*> points;
    00212
    00213   const geom::GeometryFactory* geomFact;
    00214
    00215   std::auto_ptr<geom::Geometry> empty;
    00216 };
    00217
    00218
    00219 } // namespace geos::operation::union
    00220 } // namespace geos::operation
    00221 } // namespace geos
    00222
    00223 #ifdef _MSC_VER
    00224 #pragma warning(pop)
    00225 #endif
    00226
    00227 #endif