com.revolsys.jts.geomgraph

Class TopologyLocation

java.lang.Object

com.revolsys.jts.geomgraph.TopologyLocation

public class TopologyLocation
extends Object

A TopologyLocation is the labelling of a GraphComponent's topological relationship to a single Geometry.

If the parent component is an area edge, each side and the edge itself have a topological location. These locations are named

• ON: on the edge
• LEFT: left-hand side of the edge
• RIGHT: right-hand side

If the parent component is a line edge or node, there is a single topological relationship attribute, ON.

The possible values of a topological location are {Location.NONE, Location.EXTERIOR, Location.BOUNDARY, Location.INTERIOR}

The labelling is stored in an array location[j] where where j has the values ON, LEFT, RIGHT

Version:

1.7

Constructor Summary

Constructors

Constructor and Description
TopologyLocation(Location on)
TopologyLocation(Location[] location)
TopologyLocation(Location on, Location left, Location right) Constructs a TopologyLocation specifying how points on, to the left of, and to the right of some GraphComponent relate to some Geometry.
TopologyLocation(TopologyLocation gl)

Method Summary

Methods

Modifier and Type	Method and Description
boolean	allPositionsEqual(Location loc)
void	flip()
Location	get(int posIndex)
Location[]	getLocations()
boolean	isAnyNull()
boolean	isArea()
boolean	isEqualOnSide(TopologyLocation le, int locIndex)
boolean	isLine()
boolean	isNull()
void	merge(TopologyLocation gl) merge updates only the NULL attributes of this object with the attributes of another.
void	setAllLocations(Location locValue)
void	setAllLocationsIfNull(Location locValue)
void	setLocation(int locIndex, Location locValue)
void	setLocation(Location locValue)
void	setLocations(Location on, Location left, Location right)
String	toString()

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Constructor Detail

TopologyLocation

public TopologyLocation(Location on)

TopologyLocation

public TopologyLocation(Location on,
                Location left,
                Location right)

Constructs a TopologyLocation specifying how points on, to the left of, and to the right of some GraphComponent relate to some Geometry. Possible values for the parameters are Location.NULL, Location.EXTERIOR, Location.BOUNDARY, and Location.INTERIOR.

See Also:

Location

TopologyLocation

public TopologyLocation(Location[] location)

TopologyLocation

public TopologyLocation(TopologyLocation gl)

Method Detail

allPositionsEqual

public boolean allPositionsEqual(Location loc)

flip

public void flip()

get

public Location get(int posIndex)

getLocations

public Location[] getLocations()

isAnyNull

public boolean isAnyNull()

Returns:

true if any locations are NULL

isArea

public boolean isArea()

isEqualOnSide

public boolean isEqualOnSide(TopologyLocation le,
                    int locIndex)

isLine

public boolean isLine()

isNull

public boolean isNull()

Returns:

true if all locations are NULL

merge

public void merge(TopologyLocation gl)

merge updates only the NULL attributes of this object with the attributes of another.

setAllLocations

public void setAllLocations(Location locValue)

setAllLocationsIfNull

public void setAllLocationsIfNull(Location locValue)

setLocation

public void setLocation(int locIndex,
               Location locValue)

setLocation

public void setLocation(Location locValue)

setLocations

public void setLocations(Location on,
                Location left,
                Location right)

toString

public String toString()

Overrides:

toString in class Object