Method is

src/main/java/com/volmit/adapt/util/Items.java:40–42

Is the item an item (not null or air) @param is the item @return true if it is

(ItemStack is)

     * @return true if it is
     */
    public static boolean is(ItemStack is) {
        return is != null && !is.getType().equals(Material.AIR);
    }

    /**
     * Is the item a certain material