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javacollectionsguava

Convert Multiset to a Map

I have to convert a Guava Multiset<String> to a Map<String, Integer> (Key, Count).

I cannot find any utility function for this. Is there anything shorter than my code below for this?

private static Map<String, Integer> multisetToMap(final Multiset<String> multiset) {
    Map<String, Integer> result = new HashMap<>();
    for(String element: multiset.elementSet()) {
        result.put(element, multiset.count(element));
    }
    return ImmutableMap.copyOf(result);
}
Solution

  • Indeed, there's no hidden Guava feature for this, and you're doing basically the right thing.

    I did not spot a feature request (open or otherwise) for doing exactly this either. But if we ever implement this feature request you might have another alternative.