MyInventoryDataBuilder

public class MyInventoryDataBuilder extends AbstractDataBuilder<MyInventoryData> implements DataManipulatorBuilder<MyInventoryData, MyImmutableInventoryData> {
    public MyInventoryDataBuilder() {
        super(MyInventoryData.class, 1);
    }

    @Override
    public MyInventoryData create() {
        HashMap<Integer, ItemStack> inventory = new HashMap<Integer, ItemStack>();
        return new MyInventoryData(inventory);
    }

    @Override
    public Optional<MyInventoryData> createFrom(DataHolder dataHolder) {
        return create().fill(dataHolder);
    }

    @Override
    protected Optional<MyInventoryData> buildContent(DataView container) throws InvalidDataException {
        return create().from(container);
    }
}