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<p>The idea of EnumSet implementing SortedSet or NavigableSet has
been around for a long time; see</p>
<p> <a class="moz-txt-link-freetext" href="https://bugs.openjdk.org/browse/JDK-6278287">https://bugs.openjdk.org/browse/JDK-6278287</a></p>
<p>But yes, EnumSet could also implement SequencedSet. Similarly,
EnumMap could implement SequencedMap, SortedMap, or NavigableMap.</p>
<p>Implementing NavigableSet/Map is somewhat onerous, given that
there's no AbstractNavigableSet/Map, and there are a lot of
methods and variations of views to be implemented.<br>
</p>
<p>I'm a bit skeptical about the usefulness of retrofitting
EnumSet/Map this way, though. My hunch is that EnumSet is usually
treated as a bag of named booleans used as a set of boolean
options. The EnumSet is passed around as an aggregate, with
individual enum instances tested at specific points in the code to
adjust the logic. It doesn't seem like the members of an EnumSet
would be iterated frequently, or that it would be useful to have
specific subsets of an EnumSet (which is what NavigableSet would
provide). Maybe similar analysis applies to EnumMap. <br>
</p>
<p>I could be convinced otherwise with use cases, though.<br>
</p>
<p>s'marks</p>
<p><br>
</p>
<div class="moz-cite-prefix">On 5/23/23 2:57 AM, Tagir Valeev wrote:<br>
</div>
<blockquote type="cite" cite="mid:CAE+3fjZagX91ME_cspP0a7i0b-Wr7PGnohZrxF1DUwNz3jq0zA@mail.gmail.com">
<div dir="auto">Hello!
<div dir="auto"><br>
</div>
<div dir="auto">Looks like this was overlooked. On the other
hand, it could even implement SortedSet or Navigable set, as
it's essentially not just ordered but sorted, according to the
enum natural order. Same for EnumMap.</div>
<div dir="auto"><br>
</div>
<div dir="auto">With best regards,</div>
<div dir="auto">Tagir Valeev </div>
</div>
<br>
<div class="gmail_quote">
<div dir="ltr" class="gmail_attr">On Tue, May 23, 2023, 11:46
Andrey Turbanov <<a href="mailto:turbanoff@gmail.com" moz-do-not-send="true" class="moz-txt-link-freetext">turbanoff@gmail.com</a>>
wrote:<br>
</div>
<blockquote class="gmail_quote" style="margin:0 0 0
.8ex;border-left:1px #ccc solid;padding-left:1ex">Hello.<br>
I've noticed that EnumSet unfortunately doesn't implement the
newly<br>
introduced interface SequencedSet.<br>
From the first look it fits into it.<br>
Is there a reason for that? Sorry if it was already discussed.<br>
<br>
Andrey Turbanov<br>
</blockquote>
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