"mutable" fields

Item.java

@AutoValue
public abstract class Item
{

    public static Item create(String sku, String barcode, boolean backup, boolean removed, 
            int external_srr, int external_rb) {
        return new AutoValue_Item(sku, barcode, backup, removed, external_srr, external_rb);
    }

    public abstract String sku();

    public abstract String barcode();
    
    public Item withBarcode(String newBarcode) {
        return new AutoValue_Item(sku(), newBarcode, backup(), removed(), external_srr_reservation_id(), external_rb_reservation_id());
    }

    public abstract boolean backup();

    public abstract boolean removed();

    public abstract int external_srr_reservation_id();

    public abstract int external_rb_reservation_id();
}