48 lines
1.2 KiB
Java
48 lines
1.2 KiB
Java
package de.mrbesen.telegram.event;
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import java.util.ArrayList;
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import java.util.HashMap;
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import java.util.function.Consumer;
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public class EventManager {
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private HashMap<Class<? extends Event>, ArrayList<Consumer<? extends Event>>> listeners = new HashMap<>();
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public EventManager() {}
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public <T extends Event> void registerEvent(Class<T> eventtype, Consumer<T> handler) {
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if (handler == null) {
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throw new NullPointerException();
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}
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//get list
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ArrayList<Consumer<? extends Event>> list = listeners.get(eventtype);
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if (list == null) {
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//create and add list
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list = new ArrayList<>();
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listeners.put(eventtype, list);
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} else if(list.contains(handler)) {
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throw new IllegalArgumentException("listener allready registered");
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}
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list.add(handler); // ad to list
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}
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public Event callEvent(Event e) {
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if(e == null) return null;
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ArrayList<Consumer<? extends Event>> listner = listeners.get(e.getClass());
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if(listner != null) {
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for (Consumer listn : listner) {
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try {
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listn.accept(e);
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} catch (Throwable t) {
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System.err.println("Error occurred on Handling Event: " + e.getClass().getSimpleName());
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t.printStackTrace();
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}
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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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