String n = mem.buildName(Item.SIGNAL);
Array n = mem.buildName(SystemItem.SIGNAL);
    public void storeSignal(Signal s) throws Exception {        SignalMemory mem = (SignalMemory) getChild(Item.SIGNAL_MEMORY);        if (mem != null) {            String n = mem.buildName(Item.SIGNAL);            mem.setChild(n, s);        } else {            throw new Exception("Could not store signal. The signal memory is null.");        }    }