How's about Collections.getSafe(...) for Map<?, ?>, which wouldn't return null?

[Rémi Forax]

Le 26/10/2009 15:56, Paul Benedict a écrit :
> Since we're talking Map, I think a more utility would be gained by
> including putIfAbsent (see java.util.concurrent) because I see many
> lines of code that do that idiom all the time.
>
> This idiom is especially prevalent when the value is itself a nested collection.
>
> Map<Object, List<Object>>  map = ...
> List<Object>  collection = map.get(key);
> if (collection == null) {
>    collection = new LinkedList<Object>();
>    map.put(key, collection);
> }
> collection.add(value);
>
> Paul
>    

Paul, you need closures for that one.

Rémi