有没有办法从多重映射中的值获取所有键? [英] Is there a way to get all keys from a value in a multimap?

问题描述

说我有一个番石榴多图.我有一个值"Foo"，它可能属于一个或多个键.我有什么办法可以找出哪些键包含条目"Foo"?

Say I have a guava Multimap. I have a value, "Foo", that may belong to one or more keys. Is there any way I can figure out which keys contain an entry "Foo"?

推荐答案

您可以反转Multimap.为此，您可以使用方法

You can invert the Multimap. For this you can use the method Multimaps.invertFrom.

例如，如果您的Multimap是Multimap<String, String>

For example, if your Multimap is a Multimap<String, String>

Multimap<String, String> invertedMultimap = Multimaps.invertFrom(myMultimap, ArrayListMultimap.<String, String>create());

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