21 #ifndef GEOS_GEOM_UTIL_GEOMETRYEXTRACTER_H
22 #define GEOS_GEOM_UTIL_GEOMETRYEXTRACTER_H
24 #include <geos/export.h>
25 #include <geos/geom/GeometryFilter.h>
26 #include <geos/geom/GeometryCollection.h>
27 #include <geos/platform.h>
37 class GEOS_DLL GeometryExtracter {
48 template <
class ComponentType,
class TargetContainer>
49 static void extract(
const Geometry& geom, TargetContainer& lst)
51 if (
const ComponentType* c =
dynamic_cast<const ComponentType*
>(&geom) )
55 else if (
const GeometryCollection* c =
56 dynamic_cast<const GeometryCollection*
>(&geom) )
58 GeometryExtracter::Extracter<ComponentType, TargetContainer> extracter(lst);
59 c->apply_ro(&extracter);
65 template <
class ComponentType,
class TargetContainer>
66 struct Extracter:
public GeometryFilter {
73 Extracter(TargetContainer& comps) : comps_(comps) {}
75 TargetContainer& comps_;
77 void filter_ro(
const Geometry* geom)
override
79 if (
const ComponentType* c =
dynamic_cast<const ComponentType*
>(geom) ) {
85 Extracter(
const Extracter& other);
86 Extracter& operator=(
const Extracter& rhs);
90 GeometryExtracter(
const GeometryExtracter& other) =
delete;