67 lines
1.8 KiB
C
67 lines
1.8 KiB
C
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/**********************************************************************
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*
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* GEOS - Geometry Engine Open Source
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* http://geos.osgeo.org
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*
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* Copyright (C) 2001-2002 Vivid Solutions Inc.
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* Copyright (C) 2006 Refractions Research Inc.
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*
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* This is free software; you can redistribute and/or modify it under
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* the terms of the GNU Lesser General Public Licence as published
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* by the Free Software Foundation.
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* See the COPYING file for more information.
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*
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**********************************************************************/
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#pragma once
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#include <geos/export.h>
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#include <geos/geom/GeometryFilter.h>
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#include <geos/geom/Polygon.h>
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#include <vector>
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namespace geos {
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namespace geom { // geos.geom
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namespace util { // geos.geom.util
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/**
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* Extracts all the 2-dimensional (Polygon) components from a Geometry.
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*/
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class GEOS_DLL PolygonExtracter: public GeometryFilter {
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public:
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/**
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* Pushes the Polygon components from a single geometry into
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* the provided vector.
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* If more than one geometry is to be processed, it is more
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* efficient to create a single PolygonExtracterFilter instance
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* and pass it to multiple geometries.
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*/
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static void getPolygons(const Geometry& geom, std::vector<const Polygon*>& ret);
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/**
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* Constructs a PolygonExtracterFilter with a list in which
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* to store Polygons found.
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*/
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PolygonExtracter(std::vector<const Polygon*>& newComps);
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void filter_rw(Geometry* geom) override;
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void filter_ro(const Geometry* geom) override;
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private:
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/// Reference to provided vector
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std::vector<const Polygon*>& comps;
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// Declare type as noncopyable
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PolygonExtracter(const PolygonExtracter& other) = delete;
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PolygonExtracter& operator=(const PolygonExtracter& rhs) = delete;
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};
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} // namespace geos.geom.util
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} // namespace geos.geom
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} // namespace geos
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