Method _saveBox

src/main/java/fieldbox/io/Raft.java:255–304

(Box x, Function<Box, String> alias, Predicate<Box> save)

    }

    protected Node _saveBox(Box x, Function<Box, String> alias, Predicate<Box> save) throws IOException {

        if (insideSave.containsKey(x)) return insideSave.get(x);
        if (!save.test(x)) return null;
        if (alias.apply(x) != null)
            throw new IllegalArgumentException(" can't save a box called " + alias.apply(x) + " / " + x);

        String uid = x.properties.getOrConstruct(IO.id);

        Node at = new Node();
        insideSave.put(x, at);

        Map<Dict.Prop, Object> q = x.properties.getMap();
        for (Map.Entry<Dict.Prop, Object> e : q.entrySet()) {
            if (IO.isPeristant(e.getKey()) || e.getKey().getName().equals("code")) { // code is aliased in IO1
                at.values.put(e.getKey().getName(), toValue(e.getKey(), e.getValue(), alias, save));
            }
        }

        if (x.properties.get(IO.desiredBoxClass)!=null)
            at.values.put("__class", x.properties.get(IO.desiredBoxClass));
        else
            at.values.put("__class", x.getClass().toString());

        // disconnected?

        at.children = x.children().stream().filter(z -> save.test(z)).map(z -> {
            try {
                String name = alias.apply(z);
                if (name != null) return name;
                return _saveBox(z, alias, save);
            } catch (IOException e) {
                e.printStackTrace();
            }
            return null;
        }).filter(z -> z != null).collect(Collectors.toList());

        at.parents = x.parents().stream().filter(z -> save.test(z)).map(z -> {
            try {
                String name = alias.apply(z);
                if (name != null) return name;
                return _saveBox(z, alias, save);
            } catch (IOException e) {
                e.printStackTrace();
            }
            return null;
        }).filter(z -> z != null).collect(Collectors.toList());

        return at;
    }

    private Object toValue(Dict.Prop key, Object value, Function<Box, String> alias, Predicate<Box> save) throws IOException {