Examples with TypeEnvironment org.revapi.java.spi.TypeEnvironment used on opensource projects

Example 1 with TypeEnvironment

use of org.revapi.java.spi.TypeEnvironment in project revapi by revapi.

the class SerialVersionUidChecker method computeStructuralId.

public static long computeStructuralId(TypeElement type, TypeEnvironment environment) {
    Predicate<Element> serializableFields = e -> {
        Set<Modifier> mods = e.getModifiers();
        return !mods.contains(Modifier.TRANSIENT) && !mods.contains(Modifier.STATIC);
    };
    Comparator<Element> bySimpleName = Comparator.comparing(e -> e.getSimpleName().toString());
    List<TypeMirror> fields = ElementFilter.fieldsIn(type.getEnclosedElements()).stream().filter(serializableFields).sorted(bySimpleName).map(Element::asType).collect(Collectors.toList());
    Types types = environment.getTypeUtils();
    for (TypeMirror st : Util.getAllSuperClasses(types, type.asType())) {
        Element ste = types.asElement(st);
        ElementFilter.fieldsIn(ste.getEnclosedElements()).stream().filter(serializableFields).sorted(bySimpleName).map(e -> types.asMemberOf((DeclaredType) st, e)).forEach(fields::add);
    }
    String data = fields.stream().map(Util::toUniqueString).collect(Collectors.joining());
    try {
        byte[] bytes = data.getBytes("UTF-8");
        MessageDigest md = MessageDigest.getInstance("SHA");
        byte[] hashBytes = md.digest(bytes);
        long hash = 0;
        for (int i = Math.min(hashBytes.length, 8) - 1; i >= 0; i--) {
            hash = (hash << 8) | (hashBytes[i] & 0xFF);
        }
        return hash;
    } catch (UnsupportedEncodingException | NoSuchAlgorithmException e) {
        throw new IllegalStateException("Could not compute structural ID of a type " + type.getQualifiedName().toString(), e);
    }
}