@Override
    public String toString() {
        return MoreObjects.toStringHelper(this)
                          .add("format", format)
                          .add("isCreatable", isCreatable)
                          .toString();
    }
Returns whether this {@link SamlNameIdPolicy} allows to create a new name ID.
saml/src/main/java/com/linecorp/armeria/server/saml/SamlNameIdPolicy.java