Creating a charset provider module for IBM charsets

[Dave Hobbs]

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?

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 14:26
Subject:        Re: Creating a charset provider module for IBM charsets



On 20/06/2018 14:22, Dave Hobbs wrote:
> Hi
>
> We would like to migrate a number of the IBM charsets (which don't need 
to
> be in java.base) to a modular charset provider.
>
> However, as written today our charset classes rely on sun.nio.cs classes
> and definitions, which are no longer visible. For example:
>
> sun.nio.cs.HistoricallyNamedCharset;
>
> sun.nio.cs.CharsetMapping.UNMAPPABLE_DECODING;
> sun.nio.cs.CharsetMapping.UNMAPPABLE_ENCODING;
>
> sun.nio.cs.ArrayDecoder;
> sun.nio.cs.ArrayEncoder;
>
> sun.nio.cs.Surrogate.Parser;
>
> sun.nio.cs.SingleByte.Decoder;
> sun.nio.cs.ext.DoubleByte.Decoder;
>
> sun.nio.cs.SingleByteDecoder;
> sun.nio.cs.SingleByteEncoder;
>
> Are there any alternatives to these classes in the new module system or 
an
> alternative approach to creating charsets?
Can you use jdk.charsets as an example? You'll see that java.base 
exports these packages to the service provider module.

-Alan




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