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Eclipse Platform
Release 3.5

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

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.WritableValue
All Implemented Interfaces:
IObservable, IObservableValue

public class WritableValue
extends AbstractObservableValue

Mutable (writable) implementation of IObservableValue that will maintain a value and fire change events when the value changes.

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
WritableValue ()
          Constructs a new instance with the default realm, a null value type, and a null value.
WritableValue ( Object initialValue, Object valueType)
          Constructs a new instance with the default realm.
WritableValue ( Realm realm)
          Constructs a new instance with the provided realm, a null value type, and a null initial value.
WritableValue ( Realm realm, Object initialValue, Object valueType)
          Constructs a new instance.
 
Method Summary
protected  void addListener ( Object listenerType, IObservablesListener listener)
           
protected   Object clone ()
           
  Object doGetValue ()
           
 void doSetValue ( Object value)
          Template method for setting the value of the observable.
protected  void fireEvent ( ObservableEvent event)
           
protected  void firstListenerAdded ()
           
  Realm getRealm ()
           
  Object getValueType ()
          The value type of this observable value, or null if this observable value is untyped.
protected  boolean hasListeners ()
           
protected  void lastListenerRemoved ()
           
protected  void removeListener ( Object listenerType, IObservablesListener listener)
           
static  WritableValue withValueType ( Object elementType)
           
 
Methods inherited from class org.eclipse.core.databinding.observable.value. AbstractObservableValue
addValueChangeListener, 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. IObservable
addChangeListener, addDisposeListener, addStaleListener, dispose, getRealm, isDisposed, removeChangeListener, removeDisposeListener, removeStaleListener
 

Constructor Detail

WritableValue

public WritableValue()
Constructs a new instance with the default realm, a null value type, and a null value.


WritableValue

public WritableValue(
Object initialValue,
                     
Object valueType)
Constructs a new instance with the default realm.

Parameters:
initialValue - can be null
valueType - can be null

WritableValue

public WritableValue(
Realm realm)
Constructs a new instance with the provided realm, a null value type, and a null initial value.

Parameters:
realm -

WritableValue

public WritableValue(
Realm realm,
                     
Object initialValue,
                     
Object valueType)
Constructs a new instance.

Parameters:
realm -
initialValue - can be null
valueType - can be null
Method Detail

doGetValue

public 
Object doGetValue()
Specified by:
doGetValue in class AbstractObservableValue

doSetValue

public 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
Parameters:
value - The value to set.

getValueType

public 
Object getValueType()
Description copied from interface: IObservableValue
The value type of this observable value, or null if this observable value is untyped.

Returns:
the value type, or null

withValueType

public static 
WritableValue withValueType(
Object elementType)
Parameters:
elementType - can be null
Returns:
new instance with the default realm and a value of null

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