> Currently, the two subclasses of `java.util.EnumSet` optimize bulk operations
> when the argument is also a `EnumSet`, but there is no such optimization for
> wrapper sets (returned by `Collections.unmodifiableSet`,
> `Collections.synchronizedSet`, etc.) and immutable sets (returned by `Set.of`
> methods) of `Enum`s.
>
> This PR introduces optimization classes for these situations. No public APIs
> are changed.
Tingjun Yuan has updated the pull request incrementally with one additional
commit since the last revision:
Delete compatible interfaces and introduce some methods
I have deleted `{Regular,Jumbo}EnumSetCompatible` interfaces and introduced
some package-private methods in `AbstractCollection`. This avoids rarely-used
checks from static factories in `Collections` and does not reduce much
performance compared against the previous implementation.
-------------
Changes:
- all: https://git.openjdk.org/jdk/pull/12498/files
- new: https://git.openjdk.org/jdk/pull/12498/files/0e0b2bf1..c02ca488
Webrevs:
- full: https://webrevs.openjdk.org/?repo=jdk&pr=12498&range=05
- incr: https://webrevs.openjdk.org/?repo=jdk&pr=12498&range=04-05
Stats: 392 lines in 9 files changed: 65 ins; 218 del; 109 mod
Patch: https://git.openjdk.org/jdk/pull/12498.diff
Fetch: git fetch https://git.openjdk.org/jdk.git pull/12498/head:pull/12498
PR: https://git.openjdk.org/jdk/pull/12498
