@Target({ElementType.TYPE})
                public @interface Ann {}
            '''
        ])

        when:
        def clazz = api.classes.A
        def annotations = clazz.clazz.annotations
        def extractedClass = api.extractAndLoadApiClassFrom(clazz)
        def annClazz = api.classes.Ann
        def extractedAnn = api.extractAndLoadApiClassFrom(annClazz)

            }

            return convertObj(((String[]) value)[0], clazz);
        }

        return convertObj(value, clazz);
    }

    @SuppressWarnings("unchecked")
    private static <T> T convertObj(final Object value, final Class<T> clazz) {
        if (value == null) {
            return null;
        }

        if (clazz.isAssignableFrom(String.class)) {
            return (T) value.toString();
        }

  /**
   * Returns the package name of {@code clazz} according to the Java Language Specification (section
   * 6.7). Unlike {@link Class#getPackage}, this method only parses the class name, without
   * attempting to define the {@link Package} and hence load files.
   */
  public static String getPackageName(Class<?> clazz) {
    return getPackageName(clazz.getName());
  }

  /**

  /**
   * Returns the package name of {@code clazz} according to the Java Language Specification (section
   * 6.7). Unlike {@link Class#getPackage}, this method only parses the class name, without
   * attempting to define the {@link Package} and hence load files.
   */
  public static String getPackageName(Class<?> clazz) {
    return getPackageName(clazz.getName());
  }

  /**

        ArrayList<Class<?>> classChain = new ArrayList<Class<?>>();
        Class<?> clazz = unwrap();
        do {
            classChain.add(clazz);
            clazz = clazz.getEnclosingClass();
        } while (clazz != null);
        return classChain;
    }

    private Class<?> effectiveClassOf(Class<?> clazz) {
        Class<?> enclosingClass = clazz.getEnclosingClass();

    }

    protected <T> T create(Class<T> clazz, Describable displayName, Object... args) {
        return doCreate(generator, clazz, defaultServices(), displayName, args)
    }

    protected <T> T create(Class<T> clazz, ServiceLookup services, Object... args) {
        return doCreate(generator, clazz, services, null, args)
    }

    protected <T> T create(ClassGenerator generator, Class<T> clazz, Object... args) {

        return path.replace('.', '/') + ext;
    }

    /**
     * リソースパスを返します。
     *
     * @param clazz
     *            クラス。{@literal null}であってはいけません
     * @return リソースパス
     */
    public static String getResourcePath(final Class<?> clazz) {
        assertArgumentNotNull("clazz", clazz);

        return clazz.getName().replace('.', '/') + ".class";
    }

    /**
     * コンテキストクラスローダを返します。
     *

     *
     * @param clazz
     *            クラス。{@literal null}であってはいけません
     * @return クラス名
     */
    public static String getSimpleClassName(final Class<?> clazz) {
        assertArgumentNotNull("clazz", clazz);

        if (clazz.isArray()) {
            return getSimpleClassName(clazz.getComponentType()) + "[]";
        }
        return clazz.getName();
    }

    /**

     * upcasts every method to the nearest acccessible method.
     */
    private static Method[] getAccessibleMethods(Class<?> clazz) {
        Method[] methods = clazz.getMethods();

        // Short circuit for the (hopefully) majority of cases where the
        // clazz is public
        if (Modifier.isPublic(clazz.getModifiers())) {
            return methods;
        }

        return t;
    }

    static <T> T cast(Class<T> clazz, Object o, String name) {
        if (!clazz.isInstance(o)) {
            if (o == null) {
                throw new IllegalArgumentException(name + " is null");
            }
            throw new IllegalArgumentException(name + " is not an instance of " + clazz.getName());
        }
        return clazz.cast(o);
    }