Serialization/deserialization of entire inventories

InvSerialize.java

// Usage:

    inv.setContents(deserializeAll(config.getMapList("xyz")));
    config.set("xyz", serializeAll(inv.getContents()));

// Methods:
    private ArrayList<Map<String, Object>> serializeAll(ItemStack[] contents) {
        ArrayList<Map<String, Object>> items = new ArrayList<Map<String, Object>>();
        if (contents == null) return items;

        for (ItemStack item : contents) {
            if (item == null) {
                items.add(new HashMap<String, Object>());
            } else {
                items.add(item.serialize());
            }
        }
        return items;
    }

    private ItemStack[] deserializeAll(List<Map<?, ?>> data) {
        if (data == null) return new ItemStack[0];
        ItemStack items[] = new ItemStack[data.size()];

        for (int i = 0; i < data.size(); ++i) {
            Map<String, Object> map = stringObject(data.get(i));
            if (map.size() > 0) {
                items[i] = ItemStack.deserialize(map);
            }
        }
        return items;
    }

    private Map<String, Object> stringObject(Map<?, ?> map) {
        Map<String, Object> result = new HashMap<String, Object>();
        for (Map.Entry<?, ?> entry : map.entrySet()) {
            result.put(entry.getKey().toString(), entry.getValue());
        }
        return result;
    }