gis::Geometry_visitor Class Reference

Abstract visitor class to be used on class Geometry and descendants. More...

#include <geometry_visitor.h>

Inheritance diagram for gis::Geometry_visitor:

Public Member Functions
	Geometry_visitor ()=default
virtual	~Geometry_visitor ()=default
virtual bool	visit_enter (Geometry *g)=0
	Enters a compound geometry. More...
virtual bool	visit_enter (Curve *)=0
virtual bool	visit_enter (Linestring *)=0
virtual bool	visit_enter (Linearring *)=0
virtual bool	visit_enter (Surface *)=0
virtual bool	visit_enter (Polygon *)=0
virtual bool	visit_enter (Geometrycollection *)=0
virtual bool	visit_enter (Multipoint *)=0
virtual bool	visit_enter (Multicurve *)=0
virtual bool	visit_enter (Multilinestring *)=0
virtual bool	visit_enter (Multisurface *)=0
virtual bool	visit_enter (Multipolygon *)=0
virtual bool	visit (Geometry *g)=0
	Visits a geometry. More...
virtual bool	visit (Point *)=0
virtual bool	visit (Curve *)=0
virtual bool	visit (Linestring *)=0
virtual bool	visit (Linearring *)=0
virtual bool	visit (Surface *)=0
virtual bool	visit (Polygon *)=0
virtual bool	visit (Geometrycollection *)=0
virtual bool	visit (Multipoint *)=0
virtual bool	visit (Multicurve *)=0
virtual bool	visit (Multilinestring *)=0
virtual bool	visit (Multisurface *)=0
virtual bool	visit (Multipolygon *)=0
virtual bool	visit_leave (Geometry *g)=0
	Leaves a compound geometry. More...
virtual bool	visit_leave (Curve *)=0
virtual bool	visit_leave (Linestring *)=0
virtual bool	visit_leave (Linearring *)=0
virtual bool	visit_leave (Surface *)=0
virtual bool	visit_leave (Polygon *)=0
virtual bool	visit_leave (Geometrycollection *)=0
virtual bool	visit_leave (Multipoint *)=0
virtual bool	visit_leave (Multicurve *)=0
virtual bool	visit_leave (Multilinestring *)=0
virtual bool	visit_leave (Multisurface *)=0
virtual bool	visit_leave (Multipolygon *)=0

Detailed Description

Abstract visitor class to be used on class Geometry and descendants.

A visitor will visit all elements of a compound geometry, always going down to each point unless the geometry is empty. E.g., when visiting a linestring, the visitor will descend into each point of the linestring.

The visitor can abort execution at any time. This is done by returning true from a visit() or visit_leave() function. If these functions return false, execution will continue. The accept() member function on geometries returns true if the visitor aborted execution and false otherwise.

Constructor & Destructor Documentation

Geometry_visitor()

gis::Geometry_visitor::Geometry_visitor ( )

default

~Geometry_visitor()

virtual gis::Geometry_visitor::~Geometry_visitor ( )

virtualdefault

Member Function Documentation

visit() [1/13]

virtual bool gis::Geometry_visitor::visit ( Curve *  )

pure virtual

Implemented in gis::Coordinate_range_visitor, gis::Nop_visitor, gis::Longitude_range_normalizer, gis::Wkb_size_visitor, and gis::Wkb_visitor.

visit() [2/13]

virtual bool gis::Geometry_visitor::visit ( Geometry *  g )

pure virtual

Visits a geometry.

This is called on each non-compound geometry and between visiting descendants. E.g., visit(Linestring *) will be called after visiting the first point in the linestring, then after visiting the second, etc., but not after visiting the last point.

Parameters

g	The geometry to visit.

Return values

true	Abort visitor execution.
false	Continue visitor execution.

Implemented in gis::Coordinate_range_visitor, gis::Nop_visitor, gis::Longitude_range_normalizer, gis::Wkb_size_visitor, and gis::Wkb_visitor.

visit() [3/13]

virtual bool gis::Geometry_visitor::visit ( Geometrycollection *  )

pure virtual

Implemented in gis::Coordinate_range_visitor, gis::Nop_visitor, gis::Longitude_range_normalizer, gis::Wkb_size_visitor, and gis::Wkb_visitor.

visit() [4/13]

virtual bool gis::Geometry_visitor::visit ( Linearring *  )

pure virtual

Implemented in gis::Coordinate_range_visitor, gis::Nop_visitor, gis::Longitude_range_normalizer, gis::Wkb_size_visitor, and gis::Wkb_visitor.

visit() [5/13]

virtual bool gis::Geometry_visitor::visit ( Linestring *  )

pure virtual

Implemented in gis::Coordinate_range_visitor, gis::Nop_visitor, gis::Longitude_range_normalizer, gis::Wkb_size_visitor, and gis::Wkb_visitor.

visit() [6/13]

virtual bool gis::Geometry_visitor::visit ( Multicurve *  )

pure virtual

Implemented in gis::Coordinate_range_visitor, gis::Nop_visitor, gis::Longitude_range_normalizer, gis::Wkb_size_visitor, and gis::Wkb_visitor.

visit() [7/13]

virtual bool gis::Geometry_visitor::visit ( Multilinestring *  )

pure virtual

Implemented in gis::Coordinate_range_visitor, gis::Nop_visitor, gis::Longitude_range_normalizer, gis::Wkb_size_visitor, and gis::Wkb_visitor.

visit() [8/13]

virtual bool gis::Geometry_visitor::visit ( Multipoint *  )

pure virtual

Implemented in gis::Coordinate_range_visitor, gis::Nop_visitor, gis::Longitude_range_normalizer, gis::Wkb_size_visitor, and gis::Wkb_visitor.

visit() [9/13]

virtual bool gis::Geometry_visitor::visit ( Multipolygon *  )

pure virtual

Implemented in gis::Coordinate_range_visitor, gis::Nop_visitor, gis::Longitude_range_normalizer, gis::Wkb_size_visitor, and gis::Wkb_visitor.

visit() [10/13]

virtual bool gis::Geometry_visitor::visit ( Multisurface *  )

pure virtual

Implemented in gis::Coordinate_range_visitor, gis::Nop_visitor, gis::Longitude_range_normalizer, gis::Wkb_size_visitor, and gis::Wkb_visitor.

visit() [11/13]

virtual bool gis::Geometry_visitor::visit ( Point *  )

pure virtual

Implemented in gis::Coordinate_range_visitor, gis::Coordinate_range_visitor, gis::Nop_visitor, gis::Longitude_range_normalizer, gis::Longitude_range_normalizer, gis::Wkb_size_visitor, gis::Wkb_size_visitor, gis::Wkb_visitor, and gis::Wkb_visitor.

visit() [12/13]

virtual bool gis::Geometry_visitor::visit ( Polygon *  )

pure virtual

Implemented in gis::Coordinate_range_visitor, gis::Nop_visitor, gis::Longitude_range_normalizer, gis::Wkb_size_visitor, and gis::Wkb_visitor.

visit() [13/13]

virtual bool gis::Geometry_visitor::visit ( Surface *  )

pure virtual

Implemented in gis::Coordinate_range_visitor, gis::Nop_visitor, gis::Longitude_range_normalizer, gis::Wkb_size_visitor, and gis::Wkb_visitor.

visit_enter() [1/12]

virtual bool gis::Geometry_visitor::visit_enter ( Curve *  )

pure virtual

Implemented in gis::Coordinate_range_visitor, gis::Nop_visitor, gis::Ring_flip_visitor, gis::Wkb_size_visitor, and gis::Wkb_visitor.

visit_enter() [2/12]

virtual bool gis::Geometry_visitor::visit_enter ( Geometry *  g )

pure virtual

Enters a compound geometry.

This is called on entry to a compound geometry, i.e., all geometries except points.

Parameters

g	The geometry to visit.

Return values

true	Don't descend into children.
false	Descend into children.

Implemented in gis::Coordinate_range_visitor, gis::Coordinate_range_visitor, gis::Nop_visitor, gis::Ring_flip_visitor, gis::Wkb_size_visitor, gis::Wkb_visitor, gis::Wkb_visitor, and gis::Wkb_size_visitor.

visit_enter() [3/12]

virtual bool gis::Geometry_visitor::visit_enter ( Geometrycollection *  )

pure virtual

Implemented in gis::Coordinate_range_visitor, gis::Nop_visitor, gis::Ring_flip_visitor, gis::Wkb_size_visitor, gis::Wkb_size_visitor, gis::Wkb_visitor, and gis::Wkb_visitor.

visit_enter() [4/12]

virtual bool gis::Geometry_visitor::visit_enter ( Linearring *  )

pure virtual

Implemented in gis::Coordinate_range_visitor, gis::Nop_visitor, gis::Ring_flip_visitor, gis::Wkb_size_visitor, gis::Wkb_size_visitor, and gis::Wkb_visitor.

visit_enter() [5/12]

virtual bool gis::Geometry_visitor::visit_enter ( Linestring *  )

pure virtual

Implemented in gis::Coordinate_range_visitor, gis::Nop_visitor, gis::Ring_flip_visitor, gis::Wkb_size_visitor, gis::Wkb_size_visitor, gis::Wkb_visitor, and gis::Wkb_visitor.

visit_enter() [6/12]

virtual bool gis::Geometry_visitor::visit_enter ( Multicurve *  )

pure virtual

Implemented in gis::Coordinate_range_visitor, gis::Nop_visitor, gis::Ring_flip_visitor, gis::Wkb_size_visitor, and gis::Wkb_visitor.

visit_enter() [7/12]

virtual bool gis::Geometry_visitor::visit_enter ( Multilinestring *  )

pure virtual

Implemented in gis::Ring_flip_visitor, gis::Coordinate_range_visitor, gis::Nop_visitor, gis::Ring_flip_visitor, gis::Wkb_size_visitor, and gis::Wkb_visitor.

visit_enter() [8/12]

virtual bool gis::Geometry_visitor::visit_enter ( Multipoint *  )

pure virtual

Implemented in gis::Ring_flip_visitor, gis::Coordinate_range_visitor, gis::Nop_visitor, gis::Ring_flip_visitor, gis::Wkb_size_visitor, and gis::Wkb_visitor.

visit_enter() [9/12]

virtual bool gis::Geometry_visitor::visit_enter ( Multipolygon *  )

pure virtual

Implemented in gis::Coordinate_range_visitor, gis::Nop_visitor, gis::Ring_flip_visitor, gis::Wkb_size_visitor, gis::Wkb_visitor, and gis::Ring_flip_visitor.

visit_enter() [10/12]

virtual bool gis::Geometry_visitor::visit_enter ( Multisurface *  )

pure virtual

Implemented in gis::Coordinate_range_visitor, gis::Nop_visitor, gis::Ring_flip_visitor, gis::Wkb_size_visitor, and gis::Wkb_visitor.

visit_enter() [11/12]

virtual bool gis::Geometry_visitor::visit_enter ( Polygon *  )

pure virtual

Implemented in gis::Coordinate_range_visitor, gis::Nop_visitor, gis::Ring_flip_visitor, gis::Ring_flip_visitor, gis::Wkb_size_visitor, gis::Wkb_size_visitor, gis::Wkb_visitor, and gis::Wkb_visitor.

visit_enter() [12/12]

virtual bool gis::Geometry_visitor::visit_enter ( Surface *  )

pure virtual

Implemented in gis::Coordinate_range_visitor, gis::Nop_visitor, gis::Ring_flip_visitor, gis::Wkb_size_visitor, and gis::Wkb_visitor.

visit_leave() [1/12]

virtual bool gis::Geometry_visitor::visit_leave ( Curve *  )

pure virtual

Implemented in gis::Nop_visitor.

visit_leave() [2/12]

virtual bool gis::Geometry_visitor::visit_leave ( Geometry *  g )

pure virtual

Leaves a compound geometry.

Called after visiting the last child of a compound geometry. The return value is returned to the accept() function.

Parameters

g	The geometry to visit.

Return values

true	Abort visitor execution.
false	Continue visitor execution.

Implemented in gis::Nop_visitor.

visit_leave() [3/12]

virtual bool gis::Geometry_visitor::visit_leave ( Geometrycollection *  )

pure virtual

Implemented in gis::Nop_visitor.

visit_leave() [4/12]

virtual bool gis::Geometry_visitor::visit_leave ( Linearring *  )

pure virtual

Implemented in gis::Nop_visitor.

visit_leave() [5/12]

virtual bool gis::Geometry_visitor::visit_leave ( Linestring *  )

pure virtual

Implemented in gis::Nop_visitor.

visit_leave() [6/12]

virtual bool gis::Geometry_visitor::visit_leave ( Multicurve *  )

pure virtual

Implemented in gis::Nop_visitor.

visit_leave() [7/12]

virtual bool gis::Geometry_visitor::visit_leave ( Multilinestring *  )

pure virtual

Implemented in gis::Nop_visitor.

visit_leave() [8/12]

virtual bool gis::Geometry_visitor::visit_leave ( Multipoint *  )

pure virtual

Implemented in gis::Nop_visitor.

visit_leave() [9/12]

virtual bool gis::Geometry_visitor::visit_leave ( Multipolygon *  )

pure virtual

Implemented in gis::Nop_visitor.

visit_leave() [10/12]

virtual bool gis::Geometry_visitor::visit_leave ( Multisurface *  )

pure virtual

Implemented in gis::Nop_visitor.

visit_leave() [11/12]

virtual bool gis::Geometry_visitor::visit_leave ( Polygon *  )

pure virtual

Implemented in gis::Nop_visitor.

visit_leave() [12/12]

virtual bool gis::Geometry_visitor::visit_leave ( Surface *  )

pure virtual

Implemented in gis::Nop_visitor.

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The documentation for this class was generated from the following file:

• sql/gis/geometry_visitor.h