Extract a wrapped JSF facade

Jsf.java

	@SuppressWarnings("unchecked")
	public static <S, T extends S> T unwrap(S source, Class<T> targetType) {
		while (source != null) {
			if (targetType.isInstance(source))
				return (T)source;
			if (!(source instanceof FacesWrapper))
				break;
			source = ((FacesWrapper<S>)source).getWrapped();
		}
		return null;
	}