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Eclipse Platform
Release 3.5

org.eclipse.core.databinding.observable.value
Class AbstractVetoableValue

java.lang.Object
  extended by 

org.eclipse.core.databinding.observable.AbstractObservable
      extended by 

org.eclipse.core.databinding.observable.value.AbstractObservableValue
          extended by 
org.eclipse.core.databinding.observable.value.AbstractVetoableValue
All Implemented Interfaces:
IObservable, IObservableValue, IVetoableValue

public abstract class AbstractVetoableValue
extends AbstractObservableValue
implements IVetoableValue

This class is thread safe. All state accessing methods must be invoked from the current realm. Methods for adding and removing listeners may be invoked from any thread.

Since:
1.0

Constructor Summary
AbstractVetoableValue ()
          Creates a new vetoable value.
AbstractVetoableValue ( Realm realm)
           
 
Method Summary
protected  void addListener ( Object listenerType, IObservablesListener listener)
           
 void addValueChangingListener ( IValueChangingListener listener)
           
protected   Object clone ()
           
protected abstract  void doSetApprovedValue ( Object value)
          Sets the value.
protected  void doSetValue ( Object value)
          Template method for setting the value of the observable.
protected  void fireEvent ( ObservableEvent event)
           
protected  boolean fireValueChanging ( ValueDiff diff)
          Notifies listeners about a pending change, and returns true if no listener vetoed the change.
protected  void firstListenerAdded ()
           
  Realm getRealm ()
           
protected  boolean hasListeners ()
           
protected  void lastListenerRemoved ()
           
protected  void removeListener ( Object listenerType, IObservablesListener listener)
           
 void removeValueChangingListener ( IValueChangingListener listener)
           
 
Methods inherited from class org.eclipse.core.databinding.observable.value. AbstractObservableValue
addValueChangeListener, doGetValue, fireChange, fireValueChange, getValue, isStale, removeValueChangeListener, setValue
 
Methods inherited from class org.eclipse.core.databinding.observable. AbstractObservable
addChangeListener, addDisposeListener, addStaleListener, checkRealm, dispose, fireStale, isDisposed, removeChangeListener, removeDisposeListener, removeStaleListener
 
Methods inherited from class java.lang. Object
equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 
Methods inherited from interface org.eclipse.core.databinding.observable.value. IObservableValue
addValueChangeListener, getValue, getValueType, removeValueChangeListener, setValue
 
Methods inherited from interface org.eclipse.core.databinding.observable. IObservable
addChangeListener, addDisposeListener, addStaleListener, dispose, getRealm, isDisposed, isStale, removeChangeListener, removeDisposeListener, removeStaleListener
 

Constructor Detail

AbstractVetoableValue

public AbstractVetoableValue()
Creates a new vetoable value.


AbstractVetoableValue

public AbstractVetoableValue(
Realm realm)
Parameters:
realm -
Method Detail

doSetValue

protected final void doSetValue(
Object value)
Description copied from class: AbstractObservableValue
Template method for setting the value of the observable. By default the method throws an UnsupportedOperationException .

Overrides:
doSetValue in class AbstractObservableValue

doSetApprovedValue

protected abstract void doSetApprovedValue(
Object value)
Sets the value. Invoked after performing veto checks. Should not fire change events.

Parameters:
value -

addValueChangingListener

public void addValueChangingListener(
IValueChangingListener listener)
Specified by:
addValueChangingListener in interface IVetoableValue

removeValueChangingListener

public void removeValueChangingListener(
IValueChangingListener listener)
Specified by:
removeValueChangingListener in interface IVetoableValue

fireValueChanging

protected boolean fireValueChanging(
ValueDiff diff)
Notifies listeners about a pending change, and returns true if no listener vetoed the change.

Parameters:
diff -
Returns:
false if the change was vetoed, true otherwise

addListener

protected void addListener(
Object listenerType,
                           
IObservablesListener listener)
Parameters:
listenerType -
listener -

removeListener

protected void removeListener(
Object listenerType,
                              
IObservablesListener listener)
Parameters:
listenerType -
listener -

hasListeners

protected boolean hasListeners()

fireEvent

protected void fireEvent(
ObservableEvent event)

firstListenerAdded

protected void firstListenerAdded()

lastListenerRemoved

protected void lastListenerRemoved()

getRealm

public 
Realm getRealm()
Returns:
Returns the realm.

clone

protected 
Object clone()
                throws 
CloneNotSupportedException
Overrides:
clone in class Object
Throws:
CloneNotSupportedException

Eclipse Platform
Release 3.5

Guidelines for using Eclipse APIs.

Copyright (c) Eclipse contributors and others 2000, 2008. All rights reserved.


 
 
  Published under the terms of the Eclipse Public License Version 1.0 ("EPL") Design by Interspire