> This PR corrects the special case handling in `Locale.Builder.setLocale`. The
> current handling always assumes a `Locale` matching the `ja/JP/JP` and
> `th/TH/TH` special cases will contain the correct compatibility extensions. A
> user can remove the extension or create a Locale in the form of the special
> case without the correct compatibility extension.
>
> For example, the current implementation does the following,
>
>> jshell> loc = new Builder().setLocale(Locale.of("ja", "JP",
>> "JP").stripExtensions()).build()
>> loc ==> ja_JP
>>
>> jshell> loc = new
>> Builder().setLocale(Locale.forLanguageTag("ja-JP-u-ca-foobar-x-lvariant-JP")).build()
>> loc ==> ja_JP_#u-ca-foobar
>
> That is, it silently discards the ill-formed JP variant.
>
> With assertions on, this instead becomes a `NullPointerException` when the
> extensions are not present, or an `AssertionError` when the extension has the
> wrong value.
>
> For the example above, one would expect an `IllFormedLocaleException` to be
> thrown, since without a correct compatibility extension, JP is merely an
> invalid variant and `setLocale(Locale)` throws on ill-formed fields.
>
> The changes in this PR ensure that these cases throw as expected.
>
> ---------
> - [x] I confirm that I make this contribution in accordance with the [OpenJDK
> Interim AI Policy](https://openjdk.org/legal/ai).
Justin Lu has updated the pull request incrementally with one additional commit
since the last revision:
Review - make empty script required for legacy locles
-------------
Changes:
- all: https://git.openjdk.org/jdk/pull/31728/files
- new: https://git.openjdk.org/jdk/pull/31728/files/280eb852..0f4c9fa8
Webrevs:
- full: https://webrevs.openjdk.org/?repo=jdk&pr=31728&range=01
- incr: https://webrevs.openjdk.org/?repo=jdk&pr=31728&range=00-01
Stats: 10 lines in 2 files changed: 8 ins; 0 del; 2 mod
Patch: https://git.openjdk.org/jdk/pull/31728.diff
Fetch: git fetch https://git.openjdk.org/jdk.git pull/31728/head:pull/31728
PR: https://git.openjdk.org/jdk/pull/31728
