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Eclipse Platform
Release 3.5

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

java.lang.Object
  extended by 

org.eclipse.core.databinding.observable.AbstractObservable
      extended by 
org.eclipse.core.databinding.observable.value.AbstractObservableValue
All Implemented Interfaces:
IObservable, IObservableValue
Direct Known Subclasses:
AbstractVetoableValue, ComputedValue, DateAndTimeObservableValue, DuplexingObservableValue, SelectObservableValue, WritableValue

public abstract class AbstractObservableValue
extends AbstractObservable
implements IObservableValue

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
AbstractObservableValue ()
          Constructs a new instance with the default realm.
AbstractObservableValue ( Realm realm)
           
 
Method Summary
protected  void addListener ( Object listenerType, IObservablesListener listener)
           
 void addValueChangeListener ( IValueChangeListener listener)
           
protected   Object clone ()
           
protected abstract   Object doGetValue ()
           
protected  void doSetValue ( Object value)
          Template method for setting the value of the observable.
protected  void fireChange ()
           
protected  void fireEvent ( ObservableEvent event)
           
protected  void fireValueChange ( ValueDiff diff)
           
protected  void firstListenerAdded ()
           
  Realm getRealm ()
           
  Object getValue ()
          Returns the value.
protected  boolean hasListeners ()
           
 boolean isStale ()
          Returns whether the state of this observable is stale and is expected to change soon.
protected  void lastListenerRemoved ()
           
protected  void removeListener ( Object listenerType, IObservablesListener listener)
           
 void removeValueChangeListener ( IValueChangeListener listener)
           
 void setValue ( Object value)
          Sets the value.
 
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
getValueType
 
Methods inherited from interface org.eclipse.core.databinding.observable. IObservable
addChangeListener, addDisposeListener, addStaleListener, dispose, getRealm, isDisposed, removeChangeListener, removeDisposeListener, removeStaleListener
 

Constructor Detail

AbstractObservableValue

public AbstractObservableValue()
Constructs a new instance with the default realm.


AbstractObservableValue

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

addValueChangeListener

public void addValueChangeListener(
IValueChangeListener listener)
Specified by:
addValueChangeListener in interface IObservableValue

removeValueChangeListener

public void removeValueChangeListener(
IValueChangeListener listener)
Specified by:
removeValueChangeListener in interface IObservableValue

setValue

public final void setValue(
Object value)
Description copied from interface: IObservableValue
Sets the value. Must be invoked in the Realm of the observable.

Specified by:
setValue in interface IObservableValue
Parameters:
value - the value to set

doSetValue

protected void doSetValue(
Object value)
Template method for setting the value of the observable. By default the method throws an UnsupportedOperationException .

Parameters:
value -

fireValueChange

protected void fireValueChange(
ValueDiff diff)

getValue

public final 
Object getValue()
Description copied from interface: IObservableValue
Returns the value. Must be invoked in the Realm of the observable.

Specified by:
getValue in interface IObservableValue
Returns:
the current value

doGetValue

protected abstract 
Object doGetValue()

isStale

public boolean isStale()
Description copied from interface: IObservable
Returns whether the state of this observable is stale and is expected to change soon. A non-stale observable that becomes stale will notify its stale listeners. A stale object that becomes non-stale does so by changing its state and notifying its change listeners, it does not notify its stale listeners about becoming non-stale. Clients that do not expect asynchronous changes may ignore staleness of observable objects.

Specified by:
isStale in interface IObservable
Returns:
true if this observable's state is stale and will change soon.

fireChange

protected void fireChange()
Overrides:
fireChange in class AbstractObservable

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