RFR: 8343110: Add getChars(int, int, char[], int) to CharSequence and CharBuffer [v7]

[Markus KARG]

On Sun, 23 Mar 2025 10:33:42 GMT, Markus KARG <duke at openjdk.org> wrote:

>> src/java.base/share/classes/java/nio/X-Buffer.java.template line 2356:
>> 
>>> 2354: #end[streamableType]
>>> 2355: 
>>> 2356: #if[char]
>> 
>> Can we merge this with `// -- Other char stuff --` on line 1895?
>> 
>> On a side note, we can optimize a lot of Appendable operations that transfer from CharSequence on CharBuffer; don't know if you wish to have it in this RFE or another.
>
> Fixed in a3c2add9c16e4c7331c5a7c2848f27b6c0330a17.
> 
> Let's finish this PR first. After that I would be happy to author another PR with all the optimizations you tell me. 😃

> On a side note, we can optimize a lot of Appendable operations that transfer from CharSequence on CharBuffer; don't know if you wish to have it in this RFE or another.

@liach FYI, I have just startet work on an experimental impementation for `Appendable`s utilizing `CharSequence.getChars`. So far, it really looks rather primising, as it gets rid of lots of potental copies in favor of absolute bulk get. My target is to turn it into a separate RFE eventually, once 8343110 is finally merged. 😃

-------------

PR Review Comment: https://git.openjdk.org/jdk/pull/21730#discussion_r2052366020