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refactor(events): Validate listeners #280

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10 changes: 9 additions & 1 deletion src/main/java/com/seailz/discordjar/events/EventDispatcher.java
Original file line number Diff line number Diff line change
Expand Up @@ -55,7 +55,15 @@ public void addListener(DiscordListener... listeners) {
for (DiscordListener listener : listeners) {
for (Method method : listener.getClass().getMethods()) {
if (method.isAnnotationPresent(EventMethod.class)) {
Class<? extends Event> eventType = (Class<? extends Event>) method.getParameterTypes()[0];
Class<?> maybeEventType = method.getParameterTypes()[0];

if (!Event.class.isAssignableFrom(maybeEventType))
throw new IllegalArgumentException(String.format("%s first arg is not of Event", method));
else if (method.getParameterTypes().length > 1)
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throw new IllegalArgumentException(String.format("%s#%s is an invalid listener", method.getDeclaringClass(), method.getName()));

@SuppressWarnings("unchecked")
Class<? extends Event> eventType = (Class<? extends Event>) maybeEventType;
EventMethod eventMethod = method.getAnnotation(EventMethod.class);

String customId = null;
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