@Override
  public Boolean fromString(@Nullable @NonNls String s, @NotNull ConvertContext context) {
    if (s == null || s.length() == 0) {
      return DEFAULT_VALUE;
    }
    return "true".equalsIgnoreCase(s) || "yes".equalsIgnoreCase(s);
  }
@Override
  public Boolean fromString(@Nullable @NonNls String s, @NotNull ConvertContext context)