Java 类javax.json.bind.annotation.JsonbPropertyOrder 实例源码

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) -> {
            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.LEXICOGRAPHICAL:
                                return o1.compareTo(o2);
                            case PropertyOrderStrategy.REVERSE:
                                return o2.compareTo(o1);
                            case PropertyOrderStrategy.ANY:
                            default:
                                return 1;
                        }
                    }
                }
                return 1;
            }
            return i1 - i2;
        };
    } else if (order != null) {
        switch (order) {
            case PropertyOrderStrategy.ANY:
                keyComparator = null;
                break;
            case PropertyOrderStrategy.LEXICOGRAPHICAL:
                keyComparator = String::compareTo;
                break;
            case PropertyOrderStrategy.REVERSE:
                keyComparator = Comparator.reverseOrder();
                break;
            default:
                keyComparator = null;
        }
    } else {
        keyComparator = null;
    }
    return keyComparator;
}

/**
 * Checks for {@link JsonbPropertyOrder} annotation.
 *
 * @param clazzElement class to search on
 * @return ordered properties names or null if not found
 */
public String[] getPropertyOrder(JsonbAnnotatedElement<Class<?>> clazzElement) {
    final JsonbPropertyOrder jsonbPropertyOrder = clazzElement.getElement().getAnnotation(JsonbPropertyOrder.class);
    return jsonbPropertyOrder != null ? jsonbPropertyOrder.value() : null;
}