77 lines
2.0 KiB
Java
77 lines
2.0 KiB
Java
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package de.mrbesen.telegram.event;
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import java.lang.reflect.Method;
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import java.util.ArrayList;
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public class EventManager {
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private ArrayList<EventListener> listeners = new ArrayList<EventListener>();
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private ArrayList<EventMethod> handler = new ArrayList<EventMethod>();
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public EventManager() {
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}
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@SuppressWarnings("unchecked")
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public void registerEvent(EventListener listener) {
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if(listener == null) {
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throw new NullPointerException();
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}
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if(listeners.contains(listener)) {
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throw new RuntimeException("Listener is allready registered.");
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}
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listeners.add(listener);
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//scanning handler
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for(Method met : listener.getClass().getMethods()) {
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EventHandler h = met.getAnnotation(EventHandler.class);
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if(h != null) {//handler annotation vorhanden
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if(met.getParameterCount() == 1) {//only one parameter required
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Class<?> parameterclass = met.getParameters()[0].getClass();
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if(Event.class.isAssignableFrom(parameterclass) && !parameterclass.equals(Event.class)) {//the needed parameter is a Event-subclass)
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handler.add(new EventMethod((Class<? extends Event>) parameterclass, met, listener));
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} else {
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//warn / error?
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}
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} else {
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//warn?
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}
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}
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}
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}
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public Event callEvent(Event e) {
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for(EventMethod met : handler) {
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try {
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e = met.callEvent(e);
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} catch(Throwable t) {
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System.err.println("Error while calling Event " + e.getClass().getSimpleName() + " at " + met.listener.getClass().getSimpleName() + ":" + met.met.getName());
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t.printStackTrace();
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}
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}
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return e;
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}
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private class EventMethod {
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private EventListener listener;
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private Method met;
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private Class<? extends Event> eventtype;
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private EventMethod(Class<? extends Event> eventtype, Method m, EventListener list) {
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this.met = m;
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this.eventtype = eventtype;
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this.listener = list;
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}
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private Event callEvent(Event e) {
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if(eventtype.equals(e.getClass())) {
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try {
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met.invoke(listener, e);
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} catch(Throwable t) {
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t.printStackTrace();
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}
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}
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return e;
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}
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}
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}
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