Point lambdaification of List/Set/Map (original) (raw)
Stephen Colebourne scolebourne at joda.org
Wed Jun 26 16:47:51 UTC 2013
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Sending this on to core-libs-dev to try to get a response ;-) Stephen
On 24 June 2013 16:14, Stephen Colebourne <scolebourne at joda.org> wrote:
One point lambdaification that I haven't seen mentioned is addition static factory methods for the main collection interfaces. (Strictly, this proposal is not point lambdaification as it does not involve lambdas, but it is very much in the same area).
I propose adding these static methods: Collection.empty() Collection.of(T...) List.empty() List.of(T...) Set.empty() Set.of(T...) Map.empty() Map.of(Entry...) Map.Entry.of(K, V) Each of these methods would return immutable implementations. There is a case for extending the methods to Iterator and other collection types, however these are the most important. These follow the designs of Stream static methods IIRC. This library change would remove much of the requirement for the "collection literals" change discussed in Project Coin. Implementation would ideally be via new dedicated immutable classes, however space could be saved by simply reusing the existing classes. Is this something we could fit in? (Is resourcing the problem, or the idea?) thanks Stephen
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