Creating a charset provider module for IBM charsets

[Dave Hobbs]

Yes, the proposal is to create a new module outside the JDK.

I was originally responding to your suggestion of not including these 
charsets in java.base.

http://mail.openjdk.java.net/pipermail/core-libs-dev/2018-May/053316.html

"Separately, I think we should start a discussion here about moving some 
or all of the IBM charsets to their own service provider module. I 
realize the AIX port might want to include some of them in its build of 
java.base but they aren't interesting to include in java.base, or even 
jdk.charsets, on most platforms"

A service provider module appears to be the recommended approach according 
the Java api documentation. However writing charset classes is made a lot 
more difficult by not having the sun.nio.cs classes available. 

Should we propose adding our charsets in the java.base or jdk.charsets?

- Dave




From:   Alan Bateman <Alan.Bateman at oracle.com>
To:     Dave Hobbs <dave_hobbs at uk.ibm.com>, core-libs-dev at openjdk.java.net
Date:   20/06/2018 18:27
Subject:        Re: Creating a charset provider module for IBM charsets



On 20/06/2018 15:52, Dave Hobbs wrote:
> Hi Alan,
>
> My understanding is that java.base only exports sun.nio.cs to 
jdk.charsets
> i.e java.base module-info.java has:
>
> ...
> exports sun.nio.cs to
>          java.desktop,
>          jdk.charsets;
> ...
>
> and jdk.charsets has:
>
> module jdk.charsets {
>      provides java.nio.charset.spi.CharsetProvider with
>          sun.nio.cs.ext.ExtendedCharsets;
> }
>
> So jdk.charsets can use sun.nio.cs, whereas my module can not.
>
> Am I missing something?
>
Are you proposing to add your module to the JDK or will it live outside? 
If the former then just extend the qualified export to add the name of 
the module. If the latter then you are out of luck as the sun.nio.cs 
infrastructure is not meant to be used outside of the JDK.

-Alan




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