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Eclipse Platform
Release 3.5

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

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.DuplexingObservableValue
All Implemented Interfaces:
IObservable, IObservableValue

public abstract class DuplexingObservableValue
extends AbstractObservableValue

Since:
1.2

Constructor Summary
DuplexingObservableValue ( IObservableList target)
           
DuplexingObservableValue ( IObservableList target, Object valueType)
           
 
Method Summary
 void addChangeListener ( IChangeListener listener)
          Adds the given change listener to the list of change listeners.
protected  void addListener ( Object listenerType, IObservablesListener listener)
           
 void addValueChangeListener ( IValueChangeListener listener)
           
protected   Object clone ()
           
protected abstract   Object coalesceElements ( Collection elements)
           
 void dispose ()
          Disposes of this observable object, removing all listeners registered with this object, and all listeners this object might have registered on other objects.
protected   Object doGetValue ()
           
protected  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 ()
           
 boolean isStale ()
          Returns whether the state of this observable is stale and is expected to change soon.
protected  void lastListenerRemoved ()
           
protected  void makeDirty ()
           
protected  void removeListener ( Object listenerType, IObservablesListener listener)
           
static  DuplexingObservableValue withDefaults ( IObservableList target, Object emptyValue, Object multiValue)
          Returns a DuplexingObservableValue implementation with predefined values to use if the list is empty or contains multiple different values.
 
Methods inherited from class org.eclipse.core.databinding.observable.value. AbstractObservableValue
fireChange, fireValueChange, getValue, removeValueChangeListener, setValue
 
Methods inherited from class org.eclipse.core.databinding.observable. AbstractObservable
addDisposeListener, addStaleListener, checkRealm, 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
addDisposeListener, addStaleListener, getRealm, isDisposed, removeChangeListener, removeDisposeListener, removeStaleListener
 

Constructor Detail

DuplexingObservableValue

public DuplexingObservableValue(
IObservableList target)
Parameters:
target -

DuplexingObservableValue

public DuplexingObservableValue(
IObservableList target,
                                
Object valueType)
Parameters:
target -
valueType -
Method Detail

withDefaults

public static 
DuplexingObservableValue withDefaults(
IObservableList target,
                                                    
Object emptyValue,
                                                    
Object multiValue)
Returns a DuplexingObservableValue implementation with predefined values to use if the list is empty or contains multiple different values.

Parameters:
target - the observable list
emptyValue - the value to use when the target list is empty
multiValue - the value to use when the target list contains multiple values that are not equivalent to eachother.
Returns:
a DuplexingObservableValue implementation with predefined values to use if the list is empty or contains multiple different values.

firstListenerAdded

protected void firstListenerAdded()

lastListenerRemoved

protected void lastListenerRemoved()

makeDirty

protected final void makeDirty()

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
Overrides:
isStale in class AbstractObservableValue
Returns:
true if this observable's state is stale and will change soon.

doGetValue

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

coalesceElements

protected abstract 
Object coalesceElements(
Collection elements)

doSetValue

protected 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

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

addChangeListener

public void addChangeListener(
IChangeListener listener)
Description copied from interface: IObservable
Adds the given change listener to the list of change listeners. Change listeners are notified about changes of the state of this observable in a generic way, without specifying the change that happened. To get the changed state, a change listener needs to query for the current state of this observable.

Specified by:
addChangeListener in interface IObservable
Overrides:
addChangeListener in class AbstractObservable

addValueChangeListener

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

dispose

public void dispose()
Description copied from interface: IObservable
Disposes of this observable object, removing all listeners registered with this object, and all listeners this object might have registered on other objects.

Specified by:
dispose in interface IObservable
Overrides:
dispose 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)

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