* @param oldValue old property value.
* @param newValue new property value.
*/
public void propertyChanged(IArticle article, String property, Object oldValue, Object newValue)
{
IArticleListener listener = (IArticleListener)get();
if (listener == null)
{
article.removeListener(this);
} else
{
listener.propertyChanged(article, property, oldValue, newValue);
}
}