private Comparator orderComparator()

in johnzon-jsonb/src/main/java/org/apache/johnzon/jsonb/JsonbAccessMode.java [969:1024]
56 lines of code
17 McCabe index (conditional complexity)

    private Comparator<String> orderComparator(final Class<?> clazz) {
        final Comparator<String> keyComparator;
        final JsonbPropertyOrder orderAnnotation = Meta.getAnnotation(clazz, JsonbPropertyOrder.class);
        if (orderAnnotation != null) {
            final List<String> indexed = new ArrayList<>(asList(orderAnnotation.value()));
            if (naming != null) { // JsonbPropertyOrder applies on java names
                for (int i = 0; i < indexed.size(); i++) {
                    indexed.set(i, naming.translateName(indexed.get(i)));
                }
            }
            keyComparator = (o1, o2) -> {
                if (o1 != null && o1.equals(o2)) {
                    return 0;
                }
                final int i1 = indexed.indexOf(o1);
                final int i2 = indexed.indexOf(o2);
                if (i1 < 0) {
                    if (i2 < 0) {
                        if (order != null) {
                            switch (order) {
                                case PropertyOrderStrategy.ANY:
                                case PropertyOrderStrategy.LEXICOGRAPHICAL:
                                    return o1.compareTo(o2);
                                case PropertyOrderStrategy.REVERSE:
                                    return o2.compareTo(o1);
                                default:
                                    return 1;
                            }
                        }
                    }
                    return 1;
                }
                if (i2 < 0) {
                    return -1;
                }
                return i1 - i2;
            };
        } else if (order != null) {
            switch (order) {
                case PropertyOrderStrategy.ANY:
                    keyComparator = new PerHierarchyAndLexicographicalOrderFieldComparator(clazz);
                    break;
                case PropertyOrderStrategy.LEXICOGRAPHICAL:
                    keyComparator = String::compareTo;
                    break;
                case PropertyOrderStrategy.REVERSE:
                    keyComparator = Comparator.reverseOrder();
                    break;
                default: // unlikely
                    keyComparator = null;
            }
        } else { // unlikely
            keyComparator = null;
        }
        return keyComparator;
    }