@EventHandler public static void onTransaction(TransactionEvent event) { String template = (event.getTransactionType() == BUY ? BUY_MESSAGE : SELL_MESSAGE); StringBuilder items = new StringBuilder(50); for (ItemStack item : event.getStock()) { items.append(item.getAmount()).append(' ').append(getSignName(item)); } String message = String.format( template, event.getClient().getName(), items.toString(), event.getPrice(), event.getOwner().getName(), locationToString(event.getSign().getLocation())); ChestShop.getBukkitLogger().info(message); }