package org.bukkit.event;

import java.lang.reflect.Method;
import java.util.Map;
import org.bukkit.plugin.EventExecutor;

public abstract class OptimizedListener implements Listener {

    private Map<Event.Type, Method> registeredEventHandlers = null;

    public OptimizedListener(){
        this.registeredEventHandlers = this.getEventHandlers();
    }

    public EventExecutor getEventExecutor(Event event) {
        if (this.registeredEventHandlers == null || !this.registeredEventHandlers.containsKey(event.getType())) {
            return null;
        }

        final Method eventHandler = this.registeredEventHandlers.get(event.getType());
        final Listener listener = this;

        return new EventExecutor() {
            public void execute(Listener listener, Event event) {
                try {
                    eventHandler.invoke(listener, event);
                } catch (Exception e) {
                    throw new RuntimeException(e);
                }
            }
        };
    }

    protected abstract Map<Event.Type, Method> getEventHandlers();
}