如何简化一个空安全的compareTo（）实现？

使用 Java 8 ：

private static Comparator<String> nullSafeStringComparator = Comparator        .nullsFirst(String::compareToIgnoreCase);private static Comparator<metadata> metadataComparator = Comparator        .comparing(metadata::getName, nullSafeStringComparator)        .thenComparing(metadata::getValue, nullSafeStringComparator);public int compareTo(metadata that) {    return metadataComparator.compare(this, that);}