salvo.jesus.graph

Class LabeledEdgeImpl

java.lang.Object

salvo.jesus.graph.LabeledGraphComponentImpl

salvo.jesus.graph.LabeledEdgeImpl

All Implemented Interfaces:

Serializable, Comparable, GraphComponent, LabeledEdge, LabeledGraphComponent

public class LabeledEdgeImpl
extends LabeledGraphComponentImpl
implements LabeledEdge

An implementation of LabeledEdge that dynamically derives the label for an Edge based on the label of the Edge's vertices.

To do:
Notification mechanism so that an Edge is informed about a Vertex's label state change, so that we do not have to recreate the label all the time.

Version:

$Id: LabeledEdgeImpl.java,v 1.4 2002/08/29 14:00:51 jmsalvo Exp $

Author:

Jesus M. Salvo Jr.

See Also:

Serialized Form

Constructor Summary

Constructors

Constructor and Description
LabeledEdgeImpl(Edge edge)

Method Summary

Modifier and Type	Method and Description
String	getLabel() If getFollowVertexLabel() returns true, each call to this method derives the label for the Edge for whic the label is for.
boolean	isFollowVertexLabel()
void	setFollowVertexLabel(boolean isFollow) Specifies if the edge should follow the labels of its vertices.
void	setLabel(String label) Set the label on this component.

Methods inherited from class salvo.jesus.graph.LabeledGraphComponentImpl

compareTo, hasLabel, toString

Methods inherited from class java.lang.Object

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

Methods inherited from interface salvo.jesus.graph.LabeledGraphComponent

hasLabel

Constructor Detail

LabeledEdgeImpl

public LabeledEdgeImpl(Edge edge)

Method Detail

isFollowVertexLabel

public boolean isFollowVertexLabel()

Specified by:

isFollowVertexLabel in interface LabeledEdge

Returns:

whether or not it follows the labels of its vertices, including any changes, to make sure the label for the edge is consistent with the label of the vertex.

setFollowVertexLabel

public void setFollowVertexLabel(boolean isFollow)

Description copied from interface: LabeledEdge

Specifies if the edge should follow the labels of its vertices.

Specified by:

setFollowVertexLabel in interface LabeledEdge

getLabel

public String getLabel()

If getFollowVertexLabel() returns true, each call to this method derives the label for the Edge for whic the label is for. Improvements can be made so that a LabeledEdge, GraphComponentLabel or the Edge itself is notified whenever the Vertexs of the Edge are changed.

For the moment, deriving it for each call will suffice.

Specified by:

getLabel in interface LabeledGraphComponent

Overrides:

getLabel in class LabeledGraphComponentImpl

Returns:

the label associated with this component; if hasLabel() returns false, the result of getLabel() is undefined

setLabel

public void setLabel(String label)

Description copied from interface: LabeledGraphComponent

Set the label on this component. In many cases, attempting to reassign a label after one has already been set will cause an assertion failure.

Specified by:

setLabel in interface LabeledGraphComponent

Overrides:

setLabel in class LabeledGraphComponentImpl

Parameters:

label - the new label to assign to the component