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/* Glazed Lists (c) 2003-2006 */
/* http://publicobject.com/glazedlists/ publicobject.com,*/
/* O'Dell Engineering Ltd.*/
package ca.odell.glazedlists.impl;
import ca.odell.glazedlists.ObservableElementList;
import java.util.EventListener;
import java.util.Observable;
import java.util.Observer;
/**
* An {@link ObservableElementList.Connector} for the archaic {@link Observable}
* base class which is rarely used in applications, but apparently used within
* the <a href="http://eclipsetrader.sourceforge.net/">Eclipse Trader</a>
* framework, which some Glazed Lists users are using.
*
* @author James Lemieux
*/
public class ObservableConnector<E extends Observable> implements ObservableElementList.Connector<E>, Observer, EventListener {
/** The list which contains the elements being observed via this {@link ObservableElementList.Connector}. */
private ObservableElementList<? extends E> list;
/**
* This method is called whenever the observed object is changed. It
* responds by notifying the associated ObservableElementList that the given
* {@link Observable} has been changed.
*
* @param o the Observable that has been updated
* @param arg an argument passed to observers which is ignored here
*/
public void update(Observable o, Object arg) {
((ObservableElementList) list).elementChanged(o);
}
/**
* Start observing the specified <code>element</code>.
*
* @param element the element to be observed
* @return the listener that was installed on the <code>element</code>
* to be used as a parameter to {@link #uninstallListener(Object, EventListener)}
*/
public EventListener installListener(E element) {
element.addObserver(this);
return this;
}
/**
* Stop observing the specified <code>element</code>.
*
* @param element the observed element
* @param listener the listener that was installed on the <code>element</code>
* in {@link #installListener(Object)}
*/
public void uninstallListener(E element, EventListener listener) {
element.deleteObserver(this);
}
/** {@inheritDoc} */
public void setObservableElementList(ObservableElementList<? extends E> list) {
this.list = list;
}
}
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