/*
* @(#)FigureChangeEventMulticaster.java 5.1
*
*/
package CH.ifa.draw.standard;
import java.awt.AWTEventMulticaster;
import java.util.EventListener;
import CH.ifa.draw.framework.FigureChangeEvent;
import CH.ifa.draw.framework.FigureChangeListener;
/**
* Manages a list of FigureChangeListeners to be notified of
* specific FigureChangeEvents.
*/
public class FigureChangeEventMulticaster extends
AWTEventMulticaster implements FigureChangeListener {
public FigureChangeEventMulticaster(EventListener a, EventListener b) {
super(a, b);
}
public void figureInvalidated(FigureChangeEvent e) {
((FigureChangeListener)a).figureInvalidated(e);
((FigureChangeListener)b).figureInvalidated(e);
}
public void figureRequestRemove(FigureChangeEvent e) {
((FigureChangeListener)a).figureRequestRemove(e);
((FigureChangeListener)b).figureRequestRemove(e);
}
public void figureRequestUpdate(FigureChangeEvent e) {
((FigureChangeListener)a).figureRequestUpdate(e);
((FigureChangeListener)b).figureRequestUpdate(e);
}
public void figureChanged(FigureChangeEvent e) {
((FigureChangeListener)a).figureChanged(e);
((FigureChangeListener)b).figureChanged(e);
}
public void figureRemoved(FigureChangeEvent e) {
((FigureChangeListener)a).figureRemoved(e);
((FigureChangeListener)b).figureRemoved(e);
}
public static FigureChangeListener add(FigureChangeListener a, FigureChangeListener b) {
return (FigureChangeListener)addInternal(a, b);
}
public static FigureChangeListener remove(FigureChangeListener l, FigureChangeListener oldl) {
return (FigureChangeListener) removeInternal(l, oldl);
}
protected EventListener remove(EventListener oldl)
{
if (oldl == a)
return b;
if (oldl == b)
return a;
EventListener a2 = removeInternal((FigureChangeListener)a, oldl);
EventListener b2 = removeInternal((FigureChangeListener)b, oldl);
if (a2 == a && b2 == b)
return this;
else
return addInternal((FigureChangeListener)a2, (FigureChangeListener)b2);
}
protected static EventListener addInternal(FigureChangeListener a, FigureChangeListener b) {
if (a == null) return b;
if (b == null) return a;
return new FigureChangeEventMulticaster(a, b);
}
protected static EventListener removeInternal(EventListener l, EventListener oldl) {
if (l == oldl || l == null) {
return null;
} else if (l instanceof FigureChangeEventMulticaster) {
return ((FigureChangeEventMulticaster)l).remove(oldl);
} else {
return l; // it's not here
}
}
}