Creating a charset provider module for IBM charsets

[Dave Hobbs]

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? 

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

Regards
Dave Hobbs
Java Runtimes Development
IBM Hursley
IBM United Kingdom Ltd
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