对番石榴BiMap进行排序 [英] Sorting a Guava BiMap

问题描述

我是Guava库的新手，但发现BiMap非常适合我的需求.我的问题是我需要对BiMap中的值进行排序.通常，由于它的继承排序，我本来会使用TreeMap，但是必须反转地图以查看键，就好像它们是值一样.

I am new to the Guava library, but have found that the BiMap fits my needs nicely. My one issue is that I need to sort the values in my BiMap. Normally, I would have used a TreeMap due to its inherit sorting, but being able to invert the map to look at the keys as if they are values is a must.

因此，我一直在寻求有关此问题的专家意见.我看到的解决方案是: 1.创建一个BiMap比较器，并使用我自己的地图排序实用程序. 2.建立我自己的"BiTreeMap"数据结构.

So I was looking for advice from you experts about going about this. The solutions I see are: 1. Create a BiMap comparator and use my own map sorting utility. 2. Build my own 'BiTreeMap' data structure.

有没有考虑过的解决方案吗?有没有我错过的番石榴方式"?谢谢！

Is there a solution I haven't considered? Is there a 'Guava way' to do this that I missed? Thanks!

推荐答案

我们目前尚无排序的BiMap类型，因为它的工作方式有点模棱两可:条目会按键排序吗?通过价值观?请问正向条目是否按键排序，反向条目是否按值排序?

We don't currently have a sorted BiMap type because it's a little ambiguous how it would work: would the entries be sorted by the keys? By the values? Would the forward entries be sorted by the keys, and the inverse entries be sorted by the values?

当前，唯一真正可用的替代方法是ImmutableBiMap，它保留了您将条目放在其中的顺序-因此ImmutableBiMap.copyOf(Maps.newTreeMap(map))会为您提供按键排序的BiMap.

Currently, the only real available alternative is ImmutableBiMap, which retains the ordering that you put the entries in -- so ImmutableBiMap.copyOf(Maps.newTreeMap(map)) would give you a BiMap sorted by the keys.

(不过，如果您提出了具有使用案例更多详细信息的功能请求，我们可能会更认真地考虑提供直接排序的BiMap.)

(We might more seriously consider providing a directly sorted BiMap if you filed a feature request with more details on your use case, though.)

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