@Override
  public int compareTo(PropertyKey o) {
    return mName.compareTo(o.mName);
  }
@Test
  public void compare() throws Exception {
    assertTrue(PropertyKey.CONF_DIR.compareTo(PropertyKey.DEBUG) < 0);
    assertTrue(PropertyKey.DEBUG.compareTo(PropertyKey.CONF_DIR) > 0);
    assertEquals(0, PropertyKey.DEBUG.compareTo(PropertyKey.DEBUG));
  }