com.phoenixst.plexus.util
Class FilteredGraphListener

java.lang.Object
  com.phoenixst.plexus.util.ForwardingGraphListener
      com.phoenixst.plexus.util.FilteredGraphListener

All Implemented Interfaces:

GraphListener, EventListener

public class FilteredGraphListener
extends ForwardingGraphListener

A GraphListener which filters events to be forwarded to an ObservableGraphDelegate. Instances of this class only keep a WeakReference to their delegates. If that Reference has been cleared when an event is received, this listener will remove itself as a listener of the Graph which sent the event. Because of this, it is necessary for the Graph which is using this listener to maintain a strong reference to the ObservableGraphDelegate.

Since:

1.0

Version:

$Revision: 1.3 $

Author:

Ray A. Conner

Constructor Summary

FilteredGraphListener(org.apache.commons.collections.Predicate nodePredicate, org.apache.commons.collections.Predicate edgePredicate, ObservableGraphDelegate observableDelegate)

Method Summary

void	edgeAdded(GraphEvent event) Invoked when an edge has been added to the Graph.
void	edgeRemoved(GraphEvent event) Invoked when an edge has been removed from the Graph.
void	nodeAdded(GraphEvent event) Invoked when a node has been added to the Graph.
void	nodeRemoved(GraphEvent event) Invoked when a node has been removed from the Graph.

Methods inherited from class com.phoenixst.plexus.util.ForwardingGraphListener

checkDelegate, fireEdgeAdded, fireEdgeRemoved, fireNodeAdded, fireNodeRemoved

Methods inherited from class java.lang.Object

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

Constructor Detail

FilteredGraphListener

public FilteredGraphListener(org.apache.commons.collections.Predicate nodePredicate,
                             org.apache.commons.collections.Predicate edgePredicate,
                             ObservableGraphDelegate observableDelegate)

Method Detail

nodeAdded

public void nodeAdded(GraphEvent event)

Description copied from interface: GraphListener

Invoked when a node has been added to the Graph.

Specified by:

nodeAdded in interface GraphListener

Overrides:

nodeAdded in class ForwardingGraphListener

nodeRemoved

public void nodeRemoved(GraphEvent event)

Description copied from interface: GraphListener

Invoked when a node has been removed from the Graph.

Specified by:

nodeRemoved in interface GraphListener

Overrides:

nodeRemoved in class ForwardingGraphListener

edgeAdded

public void edgeAdded(GraphEvent event)

Description copied from interface: GraphListener

Invoked when an edge has been added to the Graph.

Specified by:

edgeAdded in interface GraphListener

Overrides:

edgeAdded in class ForwardingGraphListener

edgeRemoved

public void edgeRemoved(GraphEvent event)

Description copied from interface: GraphListener

Invoked when an edge has been removed from the Graph.

Specified by:

edgeRemoved in interface GraphListener

Overrides:

edgeRemoved in class ForwardingGraphListener