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! ------------- Commit messages: - Adding a test for a NPE from guards. - Cleanup - Merge branch 'master' into type-patterns-third - Guards should be a property of (pattern) case labels, not cases. - Merge branch 'master' into type-patterns-third - Adding MatchException. - Merge branch 'switch-null' into type-patterns-third - Updating null handling. - Merge branch 'case-guard' into type-patterns-third - Moving guards to cases. - ... and 1 more: https://git.openjdk.java.net/jdk/compare/d6f01e9d...da8401d4 Changes: https://git.openjdk.java.net/jdk/pull/8182/files Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=8182&range=00 Issue: https://bugs.openjdk.java.net/browse/JDK-8282274 Stats: 824 lines in 49 files changed: 392 ins; 245 del; 187 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
