96 lines
2.8 KiB
C++
96 lines
2.8 KiB
C++
/**********************************************************************
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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) 2011 Sandro Santilli <strk@kbt.io>
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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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*
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* Last port: geom/util/GeometryExtracter.java r320 (JTS-1.12)
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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/GeometryCollection.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 the components of a given type from a {@link Geometry}.
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*/
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class GEOS_DLL GeometryExtracter {
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public:
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/**
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* Extracts the components of type <tt>clz</tt> from a {@link Geometry}
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* and adds them to the provided container.
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*
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* @param geom the geometry from which to extract
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* @param lst the list to add the extracted elements to
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*/
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template <class ComponentType, class TargetContainer>
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static void
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extract(const Geometry& geom, TargetContainer& lst)
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{
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if(const ComponentType* p_c = dynamic_cast<const ComponentType*>(&geom)) {
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lst.push_back(p_c);
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}
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else if(const GeometryCollection* p_c1 =
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dynamic_cast<const GeometryCollection*>(&geom)) {
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GeometryExtracter::Extracter<ComponentType, TargetContainer> extracter(lst);
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p_c1->apply_ro(&extracter);
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}
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}
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private:
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template <class ComponentType, class TargetContainer>
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struct Extracter: public GeometryFilter {
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/**
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* Constructs a filter with a list in which to store the elements found.
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*
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* @param comps the container to extract into (will push_back to it)
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*/
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Extracter(TargetContainer& comps) : comps_(comps) {}
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TargetContainer& comps_;
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void
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filter_ro(const Geometry* geom) override
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{
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if(const ComponentType* c = dynamic_cast<const ComponentType*>(geom)) {
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comps_.push_back(c);
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}
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}
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// Declare type as noncopyable
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Extracter(const Extracter& other);
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Extracter& operator=(const Extracter& rhs);
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};
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// Declare type as noncopyable
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GeometryExtracter(const GeometryExtracter& other) = delete;
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GeometryExtracter& operator=(const GeometryExtracter& 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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