/**
* Returns an observable value that tracks changes to the value of an observable map's entry
* specified by its key.
*
* <p>The state where the key does not exist in the map is equivalent to the state where the key
* exists and its value is <code>null</code>. The transition between these two states is not
* considered a value change and no event is fired.
*
* @param map the observable map whose entry will be tracked.
* @param key the key identifying the map entry to track.
* @param valueType the type of the value. May be <code>null</code>, meaning the value is untyped.
* @return an observable value that tracks the value associated with the specified key in the
* given map
* @since 1.1
*/
public static IObservableValue observeMapEntry(IObservableMap map, Object key, Object valueType) {
if (valueType == null) valueType = map.getValueType();
return new MapEntryObservableValue(map, key, valueType);
}
/**
* Listen to changes in observable <code>source</code> and fire a {@link PropertyChangeEvent} with
* supplied property name(s) on supplied <code>target</code> whenever the observed instance
* changes.
*
* @param source
* @param target
* @param propertyNames
*/
public static void replicate(IObservableMap source, Observable target, String... propertyNames) {
source.addMapChangeListener(new ChangeReplicator(target, propertyNames));
}
/**
* Returns an observable value that tracks changes to the value of an observable map's entry
* specified by its key.
*
* <p>The state where the key does not exist in the map is equivalent to the state where the key
* exists and its value is <code>null</code>. The transition between these two states is not
* considered a value change and no event is fired.
*
* @param map the observable map whose entry will be tracked.
* @param key the key identifying the map entry to track.
* @return an observable value that tracks the value associated with the specified key in the
* given map
* @since 1.2
*/
public static IObservableValue observeMapEntry(IObservableMap map, Object key) {
return observeMapEntry(map, key, map.getValueType());
}
