public String convert(Object o) {
        StringBuilder buf = new StringBuilder();
        Converter<Object> p = headTokenConverter;
        while (p != null) {
            buf.append(p.convert(o));
            p = p.getNext();
        }
        return buf.toString();
    }
@Test
    public void date() {
        Calendar cal = Calendar.getInstance();
        cal.set(2003, 4, 20, 17, 55);

        FileNamePattern pp = new FileNamePattern("foo%d{yyyy.MM.dd}", context);

        assertEquals("foo2003.05.20", pp.convert(cal.getTime()));

        pp = new FileNamePattern("foo%d{yyyy.MM.dd HH:mm}", context);
        assertEquals("foo2003.05.20 17:55", pp.convert(cal.getTime()));

        pp = new FileNamePattern("%d{yyyy.MM.dd HH:mm} foo", context);
        assertEquals("2003.05.20 17:55 foo", pp.convert(cal.getTime()));

    }