com.sun.javafx.beans.event

Class AbstractNotifyListener

java.lang.Object

com.sun.javafx.beans.event.AbstractNotifyListener

All Implemented Interfaces:

InvalidationListener

public abstract class AbstractNotifyListener
extends Object
implements InvalidationListener

A helper base class for notify listeners. It holds reference to its WeakListener wrapper.

Without this class, an observer which uses weak listeners would need to hold two references. The first to the original ChangeListener to prevent it from being garbage collected. The second to the WeakListener wrapper so it can unregister once registered listener. The second reference is eliminated by using this class.

Example:

public class Observer {
    private AbstractNotifyListener listener = new AbstractNotifyListener() {
        public void handle(Bean bean, PropertyReference property) {
            // do something
        }
    };

    public void start() {
        subject.addChangeListener(property, listener.getWeakListener());
    }

    public void stop() {
        subject.removeChangeListener(property, listener.getWeakListener());
    }
}

Constructor Summary

Constructors

Constructor and Description
AbstractNotifyListener()

Method Summary

Modifier and Type	Method and Description
InvalidationListener	getWeakListener()

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Methods inherited from interface javafx.beans.InvalidationListener

invalidated

Constructor Detail

AbstractNotifyListener

public AbstractNotifyListener()

Method Detail

getWeakListener

public InvalidationListener getWeakListener()