hg: lambda/lambda/jdk: initial small set of extension methods on Collection and List which provide functional-style variants of common operations.

[Rémi Forax]

On 08/19/2011 06:36 PM, Neal Gafter wrote:
> Right.  I was suggesting an organization for the code of the APIs.  That was
> only an example, and will depend on the actual syntax chosen.

However, grouping the implementation and the interface in the same
source unit makes more sense.

Rémi

>
> On Fri, Aug 19, 2011 at 9:33 AM, Brian Goetz<brian.goetz at oracle.com>  wrote:
>
>> Sorry, we don't discuss syntax here.
>>
>>
>> On 8/19/2011 12:26 PM, Neal Gafter wrote:
>>
>>> On Thu, Aug 18, 2011 at 3:47 PM, Mike Duigou<mike.duigou at oracle.com>
>>>   wrote:
>>>
>>>   Hi Paul, the real name of these classes is garbage class.
>>>>> But ListGarbage is not that cool :)
>>>>>
>>>>> As Mike says, it's just the first cut, I really hope we will not
>>>>> have any of these classes at all at the end.
>>>>>
>>>> Where do you advocate that they should go? For the collection extensions
>>>> the obvious location is Collections. Should we just create parallel
>>>> classes
>>>> for List, Set, Map, etc? ie. Lists, Sets, Maps, etc.
>>>>
>>>>
>>> They should go in the interface.  For example:
>>>
>>> public interface Collection ... {
>>>      ...
>>>
>>>      /**
>>>      * Retains all of the elements of this collection which match the
>>> provided
>>>      * predicate.
>>>      *
>>>      * @param filter a predicate which returns {@code true} for elements to
>>> be
>>>      * retained.
>>>      * @return {@code true} if any elements were retained.
>>>      */
>>>      // XXX potential source incompatibility with retainAll(null) now being
>>> ambiguous
>>>      boolean retainAll(Predicate<? super E>   filter) {
>>>          boolean retained = false;
>>>          Iterator<E>   each = this.iterator();
>>>          while(each.hasNext()) {
>>>              if(!filter.eval(each.next())) {
>>>                  each.remove();
>>>              } else {
>>>                  retained = true;
>>>              }
>>>         }
>>>
>>>          return retained;
>>>      }
>>>
>>> ...
>>> }
>>>
>>>