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/********************************************************************** | ||
* | ||
* GEOS - Geometry Engine Open Source | ||
* http://geos.osgeo.org | ||
* | ||
* Copyright (C) 2011 Sandro Santilli <[email protected]> | ||
* Copyright (C) 2001-2002 Vivid Solutions Inc. | ||
* Copyright (C) 2006 Refractions Research Inc. | ||
* | ||
* This is free software; you can redistribute and/or modify it under | ||
* the terms of the GNU Lesser General Public Licence as published | ||
* by the Free Software Foundation. | ||
* See the COPYING file for more information. | ||
* | ||
********************************************************************** | ||
* | ||
* Last port: geom/util/GeometryExtracter.java r320 (JTS-1.12) | ||
* | ||
**********************************************************************/ | ||
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#pragma once | ||
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#include <geos/export.h> | ||
#include <geos/geom/GeometryFilter.h> | ||
#include <geos/geom/GeometryCollection.h> | ||
#include <vector> | ||
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namespace geos { | ||
namespace geom { // geos.geom | ||
namespace util { // geos.geom.util | ||
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/** | ||
* Extracts all the components of a collection, or just echoes back a | ||
* pointers to singletons. | ||
*/ | ||
class GEOS_DLL GeometryLister { | ||
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public: | ||
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/** | ||
* Extracts the components from a {@link Geometry} | ||
* and adds them to the provided container. | ||
* | ||
* Useful for iterating over components of a collection. | ||
* | ||
* @param geom the geometry from which to extract | ||
* @param lst the list to add the extracted elements to | ||
*/ | ||
static void | ||
list(const Geometry* geom, std::vector<const Geometry*>& lst) | ||
{ | ||
if(geom->isCollection()) { | ||
GeometryLister::Lister lister(lst); | ||
geom->apply_ro(&lister); | ||
} | ||
else { | ||
lst.push_back(geom); | ||
} | ||
} | ||
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private: | ||
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struct Lister : public GeometryFilter { | ||
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/** | ||
* Constructs a filter with a list in which to store the elements found. | ||
* | ||
* @param comps the container to extract into (will push_back to it) | ||
*/ | ||
Lister(std::vector<const Geometry*>& p_geoms) : geoms(p_geoms) {} | ||
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std::vector<const Geometry*>& geoms; | ||
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void | ||
filter_ro(const Geometry* geom) override | ||
{ | ||
if(!geom->isCollection()) { | ||
geoms.push_back(geom); | ||
} | ||
} | ||
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// // Declare type as noncopyable | ||
// Lister(const Lister& other); | ||
// Lister& operator=(const Lister& rhs); | ||
}; | ||
}; | ||
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} // namespace geos.geom.util | ||
} // namespace geos.geom | ||
} // namespace geos | ||
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