org.geotools.event
Class AbstractGTRoot

java.lang.Object
  org.geotools.event.AbstractGTComponent
      org.geotools.event.AbstractGTRoot

All Implemented Interfaces:

GTComponent, GTRoot

Direct Known Subclasses:

StyledLayerDescriptorImpl

public abstract class AbstractGTRoot

extends AbstractGTComponent

implements GTRoot

Provides basic StyleEvent notification, may be used in conjuction with StyleList during event handling.

This class has package scope to prevent user code mistaking it for something important. It is only used to assist in the construction of this one implementation of StyleEvents. Basically this is NOT API :-)

Since:

2.2.M3

Field Summary

Fields inherited from interface org.geotools.event.GTRoot

NO_PARENT

Constructor Summary

AbstractGTRoot()

Method Summary

void	addListener(GTListener listener) Listens to changes in the Style content.
void	changed(GTDelta childDelta) Used to pass on "We changed" notification from children.
protected java.lang.Object	clone()
protected void	fire(GTDelta delta) Issue a change event w/ POST_CHANGE
protected void	fire(GTEvent event) Provides notification of daring do (and undo) in style space.
protected void	fireChanged() Simple notification that we changed.
protected void	fireChildChanged(java.lang.String childName, java.lang.Object child, java.lang.Object oldValue) Create a child delta and send it off.
protected boolean	hasListeners()
void	removed(GTDelta childDelta) Used to pass on "something is about to change" notification from children.
void	removeListener(GTListener listener) Remove a style listener

Methods inherited from class org.geotools.event.AbstractGTComponent

getNote, getParent, setNote

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.geotools.event.GTRoot

getParent

Methods inherited from interface org.geotools.event.GTComponent

getNote, setNote

Constructor Detail

AbstractGTRoot

public AbstractGTRoot()

Method Detail

clone

protected java.lang.Object clone()
                          throws java.lang.CloneNotSupportedException

Overrides:

clone in class AbstractGTComponent

Throws:

java.lang.CloneNotSupportedException

removed

public void removed(GTDelta childDelta)

Used to pass on "something is about to change" notification from children.

Specified by:

removed in interface GTRoot

Overrides:

removed in class AbstractGTComponent

Parameters:

childDelta - object containing change information

changed

public void changed(GTDelta childDelta)

Used to pass on "We changed" notification from children.

Specified by:

changed in interface GTRoot

Overrides:

changed in class AbstractGTComponent

Parameters:

childDelta - object containing change information

fireChanged

protected void fireChanged()

Simple notification that we changed.

Change will be passed on to parent.changed( delta ).

Overrides:

fireChanged in class AbstractGTComponent

fireChildChanged

protected final void fireChildChanged(java.lang.String childName,
                                      java.lang.Object child,
                                      java.lang.Object oldValue)

Create a child delta and send it off.

Use this for changes to simple types like int and Color.

Overrides:

fireChildChanged in class AbstractGTComponent

Parameters:

childName - used to the child (often bean propertyName or map key)

child -

oldValue - DOCUMENT ME!

addListener

public void addListener(GTListener listener)

Listens to changes in the Style content.

Changes are provided:

• Before: deletion
• After: modification

Since the Style data structure can be vast and complicated a trail of breadcrumbs (a delta) is provided to help find your way to the change.

Specified by:

addListener in interface GTRoot

Parameters:

listener -

removeListener

public void removeListener(GTListener listener)

Remove a style listener

Specified by:

removeListener in interface GTRoot

Parameters:

listener - Listen to notifications

fire

protected void fire(GTEvent event)

Provides notification of daring do (and undo) in style space.

Parameters:

event - Event describing notification

fire

protected void fire(GTDelta delta)

Issue a change event w/ POST_CHANGE

Parameters:

delta - Used to quickly fire off a child delta

hasListeners

protected boolean hasListeners()