org.biojava.utils

Class ChangeListener.AlwaysVetoListener

java.lang.Object

org.biojava.utils.ChangeListener.AlwaysVetoListener

All Implemented Interfaces:

EventListener, ChangeListener

Enclosing interface:

ChangeListener

public static class ChangeListener.AlwaysVetoListener
extends Object
implements ChangeListener

An implementation that always vetoes everything.

Since:

1.1

Author:

Thomas Down, Matthew Pocock

Nested Class Summary

Nested classes/interfaces inherited from interface org.biojava.utils.ChangeListener

ChangeListener.AlwaysVetoListener, ChangeListener.ChangeEventRecorder, ChangeListener.LoggingListener

Field Summary

Fields inherited from interface org.biojava.utils.ChangeListener

ALWAYS_VETO, LOG_TO_OUT

Constructor Summary

Constructors

Modifier	Constructor and Description
protected	AlwaysVetoListener() Private constructor.

Method Summary

Modifier and Type	Method and Description
void	postChange(ChangeEvent cev) Called when a change has just taken place.
void	preChange(ChangeEvent cev) Called before a change takes place.

Methods inherited from class java.lang.Object

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

Constructor Detail

AlwaysVetoListener

protected AlwaysVetoListener()

Private constructor.

Method Detail

preChange

public void preChange(ChangeEvent cev)
               throws ChangeVetoException

Description copied from interface: ChangeListener

Called before a change takes place.

This is your chance to stop the change by throwing a ChangeVetoException. This method does not indicate that the change will definitely take place, so it is not recomended that you take any positive action within this handler.

Specified by:

preChange in interface ChangeListener

Parameters:

cev - An event encapsulating the change which is about to take place.

Throws:

ChangeVetoException - Description of Exception

postChange

public void postChange(ChangeEvent cev)

Description copied from interface: ChangeListener

Called when a change has just taken place.

This method is the place to perform any behavior in response to the change event.

Specified by:

postChange in interface ChangeListener

Parameters:

cev - An event encapsulating the change which has occured.

Throws:

AssertionFailure - if this is called, as preChange should have vetoed any change already