VetoableGraphEventMediator (Tensegrity API)

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com.tensegrity.graph.event
Class VetoableGraphEventMediator

java.lang.Object
  com.tensegrity.graph.event.VetoableGraphEventMediator

All Implemented Interfaces:: EventListenerTag, VetoableGraphListener

public class VetoableGraphEventMediator
extends java.lang.Object
implements VetoableGraphListener

The VetoableGraphEventMediator facilitates to gain access to all vetoable GraphEvents.
The VetoableGraphEventMediator is allways an instance variable of a Graph and hasn't to be implemented nor registered to a GraphObject instance. This is a mandatory commandment!
An implementation of a Graph allways comes with its own VetoableGraphEventMediator implementation and is a major part of the architecture.

To be informed about all occuring vetoable events an object has to implement the GraphEventMediatorListener interface and then registered at a specific Graph as VetoableGraphEventMediatorListener.

Version:: $Id: VetoableGraphEventMediator.java,v 1.7 2005/04/04 07:15:48 MichaelKegel Exp $
Author:: MichaelKegel

Constructor Summary
`VetoableGraphEventMediator()` Constructor for VetoableGraphEventMediator.

Method Summary
`void`	`addMediatorListener(VetoableGraphEventMediatorListener listener)` Adds the `VetoableGraphEventMediatorListener` given by `listener` to the `VetoableGraphEventMediator` instance such that the listener will be notified about every event that occurs.
`java.util.List`	`getListeners()` Returns a `List` of the `VetoableGraphEventMediatorListener`s currently registered.
`void`	`removeMediatorListener(VetoableGraphEventMediatorListener listener)` Removes the `VetoableGraphEventMediatorListener` given by `listener` from the `VetoableGraphEventMediator` instance such that the listener will no longer be notified about occuring events.
`void`	`vetoableEdgePreAdd(GraphEvent graphevent)` This mehtod is called when an `Edge` is about to be added to a `Graph`.
`void`	`vetoableEdgePreRemove(GraphEvent graphevent)` This method is called when an `Edge` is about to be removed from a `Graph`.
`void`	`vetoableEdgePreSplit(GraphEvent graphevent)` This method is called when an `Edge` is about to be split by a node.
`void`	`vetoableNodePreAdd(GraphEvent graphevent)` This method is called when a `Node` is about to be added to a `Graph`.
`void`	`vetoableNodePreDeleteEdgeCascade(GraphEvent graphevent)` This method is called when an `Node` is about to delete, which will is connected by two edges that will be automatically merged into a single edge.
`void`	`vetoableNodePreRemove(GraphEvent graphevent)` This method is called when a `Node` is about to be removed from a `Graph`.

Methods inherited from class java.lang.Object

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

Constructor Detail

VetoableGraphEventMediator

public VetoableGraphEventMediator()

Constructor for VetoableGraphEventMediator.

Method Detail

addMediatorListener

public void addMediatorListener(VetoableGraphEventMediatorListener listener)

Adds the VetoableGraphEventMediatorListener given by listener to the VetoableGraphEventMediator instance such that the listener will be notified about every event that occurs.

Parameters:: listener - the VetoableGraphEventMediatorListener to add

removeMediatorListener

public void removeMediatorListener(VetoableGraphEventMediatorListener listener)

Removes the VetoableGraphEventMediatorListener given by listener from the VetoableGraphEventMediator instance such that the listener will no longer be notified about occuring events.

Parameters:: listener - the VetoableGraphEventMediatorListener to remove

getListeners

public java.util.List getListeners()

Returns a List of the VetoableGraphEventMediatorListeners currently registered.

Returns:: List the list of the listeners currently registered