func (sc *StorageClass) MarshalText() ([]byte, error) {
	if sc.Parity != 0 {
		return []byte(fmt.Sprintf("%s:%d", schemePrefix, sc.Parity)), nil
	}
	return []byte{}, nil
}

func (sc *StorageClass) String() string {
	if sc.Parity != 0 {
		return fmt.Sprintf("%s:%d", schemePrefix, sc.Parity)
	}
	return ""
}

// Parses given storageClassEnv and returns a storageClass structure.