Re: 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