List of usage examples for java.lang.invoke MethodHandles publicLookup
public static Lookup publicLookup()
From source file:me.rojo8399.placeholderapi.impl.utils.TypeUtils.java
@SuppressWarnings("unchecked") public static <T> Optional<T> tryCast(Object val, final Class<T> expected) { if (val == null) { return Optional.empty(); }/* w ww . java2 s. c om*/ if (expected == null) { throw new IllegalArgumentException("Must provide an expected class!"); } if (val instanceof BaseValue<?> && !BaseValue.class.isAssignableFrom(expected)) { return tryCast(((BaseValue<?>) val).get(), expected); } if (val instanceof Supplier) { Supplier<?> fun = (Supplier<?>) val; return tryCast(fun.get(), expected); } if (Text.class.isAssignableFrom(expected)) { if (val instanceof Text) { return TypeUtils.tryOptional(() -> expected.cast(val)); } else { if (val instanceof ItemStack) { return TypeUtils.tryOptional(() -> expected.cast(TextUtils.ofItem((ItemStack) val))); } if (val instanceof Instant) { return TypeUtils.tryOptional(() -> expected.cast(TextSerializers.FORMATTING_CODE .deserialize(PlaceholderAPIPlugin.getInstance().formatter() .format(LocalDateTime.ofInstant((Instant) val, ZoneId.systemDefault()))))); } if (val instanceof Duration) { String dur = formatDuration((Duration) val); return TypeUtils .tryOptional(() -> expected.cast(TextSerializers.FORMATTING_CODE.deserialize(dur))); } if (val instanceof LocalDateTime) { return TypeUtils.tryOptional(() -> expected.cast(TextSerializers.FORMATTING_CODE.deserialize( PlaceholderAPIPlugin.getInstance().formatter().format((LocalDateTime) val)))); } if (val instanceof CommandSource) { return TypeUtils.tryOptional(() -> expected.cast(TextSerializers.FORMATTING_CODE .deserialize(String.valueOf(((CommandSource) val).getName())))); } if (val.getClass().isArray()) { List<Text> l2 = unboxPrimitiveArray(val).stream() .map(o -> tryCast(o, (Class<? extends Text>) expected)).flatMap(unmapOptional()) .collect(Collectors.toList()); return TypeUtils.tryOptional(() -> expected.cast(Text.joinWith(Text.of(", "), l2))); } if (val instanceof Iterable) { Iterable<?> l = (Iterable<?>) val; // should be safe cause we already checked assignability @SuppressWarnings("serial") final List<Text> l2 = new ArrayList<Object>() { { for (Object o : l) { add(o); } } }.stream().map(o -> tryCast(o, (Class<? extends Text>) expected)).flatMap(unmapOptional()) .collect(Collectors.toList()); return TypeUtils.tryOptional(() -> expected.cast(Text.joinWith(Text.of(", "), l2))); } return TypeUtils.tryOptional( () -> expected.cast(TextSerializers.FORMATTING_CODE.deserialize(String.valueOf(val)))); } } if (val instanceof String) { if (String.class.isAssignableFrom(expected)) { return tryOptional(() -> expected.cast(val)); } if (expected.isArray() && String.class.isAssignableFrom(expected.getComponentType())) { String v = (String) val; if (v.isEmpty()) { return Optional.empty(); } if (!v.contains("_")) { return tryOptional(() -> expected.cast(new String[] { v })); } String[] x = v.split("_"); if (x.length == 0) { return Optional.empty(); } boolean ne = false; for (String s : x) { ne = ne || !s.isEmpty(); } if (!ne) { return Optional.empty(); } return tryOptional(() -> expected.cast(x)); } if (List.class.isAssignableFrom(expected) && String.class.isAssignableFrom(expected.getTypeParameters()[0].getGenericDeclaration())) { String v = (String) val; if (v.isEmpty()) { return Optional.empty(); } if (!v.contains("_")) { return tryOptional(() -> expected.cast(Collections.singletonList(v))); } String[] x = v.split("_"); if (x.length == 0) { return Optional.empty(); } boolean ne = false; for (String s : x) { ne = ne || !s.isEmpty(); } if (!ne) { return Optional.empty(); } return tryOptional(() -> expected.cast(Arrays.asList(x))); } Optional<T> opt = tryOptional(() -> convertPrimitive((String) val, expected)); if (opt.isPresent()) { return opt; } opt = deserializers.entrySet().stream() .filter(e -> e.getKey().isSubtypeOf(expected) || e.getKey().getRawType().equals(expected)) .map(Map.Entry::getValue).map(f -> tryOptional(() -> f.apply((String) val))) .flatMap(unmapOptional()).findAny().flatMap(o -> tryOptional(() -> expected.cast(o))); if (opt.isPresent()) { return opt; } try { // should theoretically match any string -> object conversions, such as deser // for now im filtering against method names as well just to avoid issues where // expected result is not obtained due to weird methods, might change in future Method method = Arrays.stream(expected.getDeclaredMethods()) .filter(m -> Modifier.isStatic(m.getModifiers()) && Modifier.isPublic(m.getModifiers())) .filter(m -> Arrays.stream(m.getParameterTypes()).anyMatch(c -> c.equals(String.class))) .filter(m -> m.getReturnType().equals(expected) || m.getReturnType().equals(Optional.class)) .filter(m -> STRING_TO_VAL_PATTERN.matcher(m.getName()).find()).findAny().get(); // error if no Object valout = method.invoke(null, (String) val); if (valout == null) { return Optional.empty(); } if (expected.isInstance(valout)) { // Register a new deserializer once we confirm it works. Should prevent // extremely long parsing from happening multiple times. final MethodHandle mh = MethodHandles.publicLookup().unreflect(method); PlaceholderServiceImpl.get().registerTypeDeserializer(TypeToken.of(expected), str -> { try { return expected.cast(mh.invokeExact((String) val)); } catch (Throwable e1) { throw new RuntimeException(e1); } }); return tryOptional(() -> expected.cast(valout)); } if (valout instanceof Optional) { Optional<?> valopt = (Optional<?>) valout; if (!valopt.isPresent()) { return Optional.empty(); } Object v = valopt.get(); if (expected.isInstance(v)) { // Register a new deserializer once we confirm it works. Should prevent // extremely long parsing from happening multiple times. final MethodHandle mh = MethodHandles.publicLookup().unreflect(method); PlaceholderServiceImpl.get().registerTypeDeserializer(TypeToken.of(expected), str -> { try { Optional<?> optx = (Optional<?>) mh.invokeExact((String) val); return expected.cast(optx.get()); } catch (Throwable e1) { throw new RuntimeException(e1); } }); return tryOptional(() -> expected.cast(v)); } else { return Optional.empty(); } } return Optional.empty(); } catch (Exception e) { // fires if no method found, if invoke throws, if something else goes wrong return Optional.empty(); } } return TypeUtils.tryOptional(() -> expected.cast(val)); }