Package org.locationtech.jts.operation

Class BoundaryOp

java.lang.Object

org.locationtech.jts.operation.BoundaryOp

public class BoundaryOp
extends java.lang.Object

Computes the boundary of a Geometry. Allows specifying the BoundaryNodeRule to be used. This operation will always return a Geometry of the appropriate dimension for the boundary (even if the input geometry is empty). The boundary of zero-dimensional geometries (Points) is always the empty GeometryCollection.

Version:

1.7

Author:

Martin Davis

Constructor Summary

Constructors

Constructor	Description
BoundaryOp(Geometry geom)	Creates a new instance for the given geometry.
BoundaryOp(Geometry geom, BoundaryNodeRule bnRule)	Creates a new instance for the given geometry.

Method Summary

Modifier and Type	Method	Description
Geometry	getBoundary()	Gets the computed boundary.
static Geometry	getBoundary(Geometry g)	Computes a geometry representing the boundary of a geometry.
static Geometry	getBoundary(Geometry g, BoundaryNodeRule bnRule)	Computes a geometry representing the boundary of a geometry, using an explicit BoundaryNodeRule.
static boolean	hasBoundary(Geometry geom, BoundaryNodeRule boundaryNodeRule)	Tests if a geometry has a boundary (it is non-empty).

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

BoundaryOp

public BoundaryOp(Geometry geom)

Creates a new instance for the given geometry.

Parameters:

geom - the input geometry

BoundaryOp

public BoundaryOp(Geometry geom,
                  BoundaryNodeRule bnRule)

Creates a new instance for the given geometry.

Parameters:

geom - the input geometry

bnRule - the Boundary Node Rule to use

Method Detail

getBoundary

public static Geometry getBoundary(Geometry g)

Computes a geometry representing the boundary of a geometry.

Parameters:

g - the input geometry

Returns:

the computed boundary

getBoundary

public static Geometry getBoundary(Geometry g,
                                   BoundaryNodeRule bnRule)

Computes a geometry representing the boundary of a geometry, using an explicit BoundaryNodeRule.

Parameters:

g - the input geometry

bnRule - the Boundary Node Rule to use

Returns:

the computed boundary

hasBoundary

public static boolean hasBoundary(Geometry geom,
                                  BoundaryNodeRule boundaryNodeRule)

Tests if a geometry has a boundary (it is non-empty). The semantics are:

• Empty geometries do not have boundaries.
• Points do not have boundaries.
• For linear geometries the existence of the boundary is determined by the BoundaryNodeRule.
• Non-empty polygons always have a boundary.

Parameters:

geom - the geometry providing the boundary

boundaryNodeRule - the Boundary Node Rule to use

Returns:

true if the boundary exists

getBoundary

public Geometry getBoundary()

Gets the computed boundary.

Returns:

the boundary geometry