> This is a (preliminary) patch for javac implementation for the third preview > of pattern matching for switch (type patterns in switches). > > Draft JLS: > http://cr.openjdk.java.net/~gbierman/PatternSwitchPlusRecordPatterns/PatternSwitchPlusRecordPatterns-20220407/specs/patterns-switch-jls.html > > The changes are: > -there are no guarded patterns anymore, guards are not bound to the > CaseElement (JLS 15.28) > -a new contextual keyword `when` is used to add a guard, instead of `&&` > -`null` selector value is handled on switch level (if a switch has `case > null`, it is used, otherwise a NPE is thrown), rather than on pattern > matching level. > -total patterns are allowed in `instanceof` > -`java.lang.MatchException` is added for the case where a switch is > exhaustive (due to sealed types) at compile-time, but not at runtime. > > Feedback is welcome! > > Thanks!
Jan Lahoda has updated the pull request with a new target base due to a merge or a rebase. The pull request now contains 20 commits: - Reducing MatchException constructors. - Merge branch 'master' into type-patterns-third - Reference-type pattern is not applicable at a selector of a primitive type - fixing. - Merge branch 'master' into type-patterns-third - Cleanup, fixing tests. - Cleanup - more total -> unconditional pattern renaming. - Adjusting to review feedback. - Cleanup. - Fixing tests. - Adding a test for a NPE from guards. - ... and 10 more: https://git.openjdk.java.net/jdk/compare/4919525d...115605ae ------------- Changes: https://git.openjdk.java.net/jdk/pull/8182/files Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=8182&range=07 Stats: 860 lines in 52 files changed: 424 ins; 244 del; 192 mod Patch: https://git.openjdk.java.net/jdk/pull/8182.diff Fetch: git fetch https://git.openjdk.java.net/jdk pull/8182/head:pull/8182 PR: https://git.openjdk.java.net/jdk/pull/8182
