salvo.jesus.graph.listener

Class PathListener

java.lang.Object

salvo.jesus.graph.listener.NullGraphListener

salvo.jesus.graph.listener.PathListener

All Implemented Interfaces:

Serializable, EventListener, GraphListener, AbstractPathListener

public class PathListener
extends NullGraphListener
implements AbstractPathListener

PathListener imposes a path structure on a Graph. It can be used as a delegate by any class which wants to implement the Path interface.

Version:

$Id: PathListener.java,v 1.2 2002/08/24 08:05:24 jmsalvo Exp $

Author:

John V. Sichi

See Also:

Serialized Form

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
class	PathListener.PathTraversal

Constructor Summary

Constructors

Constructor and Description
PathListener(Path path) Creates a new PathListener for the given graph.

Method Summary

Modifier and Type	Method and Description
void	afterEdgeAdded(GraphAddEdgeEvent event) Called when an edge is being added to a graph, just after the graph structure has actually been changed.
void	afterVertexAdded(GraphAddVertexEvent event) Called when a vertex is being added to a graph, just after the graph structure has actually been changed.
void	afterVertexRemoved(GraphRemoveVertexEvent event) Called when a vertex is being removed from a graph, just after the graph structure has actually been changed.
void	beforeEdgeAdded(GraphAddEdgeEvent event) Called when an edge is being added to a graph, just before the graph structure is actually changed.
void	beforeEdgeRemoved(GraphRemoveEdgeEvent event) Called when an edge is being removed from a graph, just before the graph structure is actually changed.
Vertex	getFirstVertex() Returns the first Vertex in the Path.
Vertex	getLastVertex() Returns the last Vertex in the Path.
GraphTraversal	getTraversal()

Methods inherited from class salvo.jesus.graph.listener.NullGraphListener

afterEdgeRemoved, beforeVertexAdded, beforeVertexRemoved

Methods inherited from class java.lang.Object

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

Methods inherited from interface salvo.jesus.graph.GraphListener

afterEdgeRemoved, beforeVertexAdded, beforeVertexRemoved

Constructor Detail

PathListener

public PathListener(Path path)

Creates a new PathListener for the given graph.

Parameters:

graph - the graph to which this listener is to be attached; this constructor will automatically register the listener to receive all events

Method Detail

getFirstVertex

public Vertex getFirstVertex()

Returns the first Vertex in the Path.

Specified by:

getFirstVertex in interface AbstractPathListener

getLastVertex

public Vertex getLastVertex()

Returns the last Vertex in the Path.

Specified by:

getLastVertex in interface AbstractPathListener

afterVertexAdded

public void afterVertexAdded(GraphAddVertexEvent event)

Description copied from interface: GraphListener

Called when a vertex is being added to a graph, just after the graph structure has actually been changed.

Specified by:

afterVertexAdded in interface GraphListener

Overrides:

afterVertexAdded in class NullGraphListener

Parameters:

event - the event describing the vertex addition

afterVertexRemoved

public void afterVertexRemoved(GraphRemoveVertexEvent event)

Description copied from interface: GraphListener

Called when a vertex is being removed from a graph, just after the graph structure has actually been changed.

Specified by:

afterVertexRemoved in interface GraphListener

Overrides:

afterVertexRemoved in class NullGraphListener

Parameters:

event - the event describing the vertex removal

beforeEdgeAdded

public void beforeEdgeAdded(GraphAddEdgeEvent event)
                     throws Exception

Description copied from interface: GraphListener

Called when an edge is being added to a graph, just before the graph structure is actually changed.

Specified by:

beforeEdgeAdded in interface GraphListener

Overrides:

beforeEdgeAdded in class NullGraphListener

Parameters:

event - the event describing the edge addition

Throws:

Exception

afterEdgeAdded

public void afterEdgeAdded(GraphAddEdgeEvent event)

Description copied from interface: GraphListener

Called when an edge is being added to a graph, just after the graph structure has actually been changed.

Specified by:

afterEdgeAdded in interface GraphListener

Overrides:

afterEdgeAdded in class NullGraphListener

Parameters:

event - the event describing the edge addition

beforeEdgeRemoved

public void beforeEdgeRemoved(GraphRemoveEdgeEvent event)
                       throws Exception

Description copied from interface: GraphListener

Called when an edge is being removed from a graph, just before the graph structure is actually changed.

Specified by:

beforeEdgeRemoved in interface GraphListener

Overrides:

beforeEdgeRemoved in class NullGraphListener

Parameters:

event - the event describing the edge removal

Throws:

Exception

getTraversal

public GraphTraversal getTraversal()