<i18n dev> RFR: 8365675: Add String Unicode Case-Folding Support [v2]

[Roger Riggs]

On Tue, 7 Oct 2025 22:18:58 GMT, Roger Riggs <rriggs at openjdk.org> wrote:

>> Xueming Shen has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   minor api doc updates
>
> src/java.base/share/classes/jdk/internal/lang/CaseFolding.java.template line 230:
> 
>> 228:      private static class CaseFoldingEntry {
>> 229:         final int cp;
>> 230:         final char[] folding;
> 
> Consider storing the folding as a int or long directly to avoid the overhead of small char arrays.
> Arrange to be able to compare the whole replacement with another codePoint, etc.

I misunderstood the algorithm when comparing folded characters against non-folded sequences.
I still think a fast path for single character replacements will lower memory costs and improve performance.
The case of single-codepoint to single-codepoint dominates the case folding mappings.

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PR Review Comment: https://git.openjdk.org/jdk/pull/27628#discussion_r2413846987