Bukkit

private static HashMap<Character, Flag> charMap;
private static HashMap<Class, ArrayList<Flag>> eventMap; 

static {
charMap = new HashMap<Character, Flag>();
eventMap = new HashMap<Class, Flag>();
}

public static void register(Event e, Character key, Flag default) {
if(charMap.containsKey(key))
return;
charMap.put(key, default);
eventMap.put(e.getClass(), default);
}

private HashMap<Class, Flag> townFlags;
public FlagSet() {
townFlags = new HashMap<Class, Flag>();
for(Class c : eventMap.keySet())
townFlags.put(c, eventMap.get(c).clone());
}