ItemManager.java

            // Construct CoolDown object.
            Optional<CoolDown> coolDown = Optional.empty();
            if (plugin.getConfig().getBoolean("items." + str + ".cooldown.enabled")) {
                coolDown = Optional.of(new CoolDown(plugin.getConfig().getDouble("items." + str + ".cooldown.duration"),
                        plugin.getConfig().getBoolean("items." + str + ".use-formatted-time"),
                        plugin.getConfig().getBoolean("items." + str + ".use-expired-message"),
                        t(plugin.getConfig().getStringList("items." + str + ".consume-message")),
                        t(plugin.getConfig().getStringList("items." + str + ".cooldown-message")),
                        t(plugin.getConfig().getStringList("items." + str + ".expired-message"))));
            }

            Optional<String> permissionNode = Optional.ofNullable(plugin.getConfig().getString("items." + str + ".permission"));

            // Construct ConsumptionControl object.
            Optional<ConsumptionControl> consumptionControl = Optional.empty();
            if (plugin.getConfig().getBoolean("items." + str + ".consumption-control.enabled")) {
                consumptionControl = Optional.of(new ConsumptionControl(plugin.getConfig().getInt("items." + str + ".consumption-control.food-level"),
                        Float.valueOf(plugin.getConfig().getString("items." + str + ".consumption-control.saturation")),
                        plugin.getConfig().getStringList("items." + str + ".consumption-control.effects")));
            }

            // Add the item to the set.
            items.add(new Item(material, confData, permissionNode.orElseGet(null), coolDown.orElseGet(null), consumptionControl.orElseGet(null)));