> 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 incrementally with two additional commits since the last revision: - Updating naming to more closely follow the spec: total patterns are renamed to unconditional patterns, unrefined is now unguarded. - Case label elements cannot be unguarded if they have a guard of a type different than boolean. ------------- Changes: - all: https://git.openjdk.java.net/jdk/pull/8182/files - new: https://git.openjdk.java.net/jdk/pull/8182/files/1101ad46..b0fb8dcd Webrevs: - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=8182&range=10 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=8182&range=09-10 Stats: 247 lines in 12 files changed: 126 ins; 73 del; 48 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
