public synchronized void unregisterListener(EventListener listener) {
Iterator<EventSender> i = eventSenders.iterator();
while (i.hasNext()) {
EventSender sender = i.next();
sender.unregisterListener(listener);
if (sender.getListeners().isEmpty()) i.remove();
}
}
public synchronized void registerListener(EventListener listener) {
Class<? extends EventListener> listenerClass = listener.getClass();
for (Method method : listenerClass.getMethods()) {
if (!method.isAnnotationPresent(EventHandler.class)) continue;
if (method.getParameterTypes().length != 1)
throw new IllegalArgumentException(
"Method "
+ method.toString()
+ " in class "
+ method.getDeclaringClass().getName()
+ " has incorrect amount of parameters");
Class<? extends Event> eventClass = method.getParameterTypes()[0].asSubclass(Event.class);
boolean senderExists = false;
for (EventSender sender : eventSenders) {
if (eventClass.isAssignableFrom(sender.getListenerEventClass()))
sender.addHandler(listener, method);
if (eventClass == sender.getListenerEventClass()) senderExists = true;
}
if (!senderExists) {
EventSender sender = new EventSender(eventClass);
eventSenders.add(sender);
sender.addHandler(listener, method);
}
}
}
public synchronized List<EventListener> getListeners(Class<? extends Event> eventClass) {
for (EventSender sender : eventSenders)
if (eventClass.isAssignableFrom(sender.getListenerEventClass())) return sender.getListeners();
return Collections.emptyList();
}
public synchronized void sendEvent(Event event) {
for (EventSender sender : new ArrayList<>(eventSenders)) {
Class<? extends Event> eventClass = sender.getListenerEventClass();
if (eventClass.isInstance(event)) sender.sendEvent(event);
}
}