Class Java9Util

src/main/java/me/coley/recaf/util/Java9Util.java:17–87

Package-private util to deal with modules. @author xxDark

 * @author xxDark
 */
final class Java9Util {

    private static final MethodHandle CLASS_MODULE;
    private static final MethodHandle CLASS_LOADER_MODULE;
    private static final MethodHandle METHOD_MODIFIERS;

    /**
     * Deny all constructions.
     */
    private Java9Util() {
    }

    /**
     * @param klass {@link Class} to get module from.
     * @return {@link Module} of the class.
     */
    static Module getClassModule(Class<?> klass) {
        try {
            return (Module) CLASS_MODULE.invokeExact(klass);
        } catch (Throwable t) {
            // That should never happen.
            throw new AssertionError(t);
        }
    }

    /**
     * @param loader {@link ClassLoader} to get module from.
     * @return {@link Module} of the class.
     */
    static Module getLoaderModule(ClassLoader loader) {
        try {
            return (Module) CLASS_LOADER_MODULE.invokeExact(loader);
        } catch (Throwable t) {
            // That should never happen.
            throw new AssertionError(t);
        }
    }


    /**
     * @param method {@link Method} to change modifiers for.
     * @param modifiers new modifiers.
     */
    static void setMethodModifiers(Method method, int modifiers) {
        try {
            METHOD_MODIFIERS.invokeExact(method, modifiers);
        } catch (Throwable t) {
            // That should never happen.
            throw new AssertionError(t);
        }
    }


    static {
        try {
            Field field = Unsafe.class.getDeclaredField("theUnsafe");
            field.setAccessible(true);
            Unsafe unsafe = (Unsafe) field.get(null);