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From "Tiago R. Espinha (JIRA)" <j...@apache.org>
Subject [jira] Updated: (DERBY-4746) (Server) Implement UTF8 support on DRDA
Date Sat, 17 Jul 2010 16:01:50 GMT

     [ https://issues.apache.org/jira/browse/DERBY-4746?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Tiago R. Espinha updated DERBY-4746:
------------------------------------

    Attachment: DERBY-4746.diff

This patch is a small incremental patch on what has been done for DERBY-728 to accommodate
the server implementation. It does not yet insert any switch to the UTF8 encoding. Following
is a walkthrough the changes:

- DDMWriter.java - When writing a scalar string, getting the length() off a string is no longer
correct. When using EBCDIC this worked as ASCII characters in Java Strings take just 1 byte.
However, what we require is the byte length and this differs based on the current ccsidManager
(EbcdicCcsidManager maintains the old behavior).

- CcsidManager.java - Added two constants that represent the manager level for each of the
CCSIDs. Note that our current implementation has EBCDIC at level 0, where as the specification
mentions that it should be at level 500. I'm ignoring this for now as it doesn't interfere
with the implementation (I check whether the level is 1208, if it isn't then it is EBCDIC)
but we might want to fix this in the future.

The CcsidManager also gets a new abstract method called getByteLength(String str) that takes
a String and returns the byte length of that String, using the method specified by each CCSID
manager.

- Utf8CcsidManager.java - Converting to a Java String from bytes now has a different behavior.
After experimenting with the protocol tests I've noticed that the offset and numToConvert
are given in bytes and not characters.

> (Server) Implement UTF8 support on DRDA
> ---------------------------------------
>
>                 Key: DERBY-4746
>                 URL: https://issues.apache.org/jira/browse/DERBY-4746
>             Project: Derby
>          Issue Type: Sub-task
>    Affects Versions: 10.7.0.0
>            Reporter: Tiago R. Espinha
>            Assignee: Tiago R. Espinha
>         Attachments: DERBY-4746.diff
>
>
> I'm branching out this issue into server and client changes. Since the changes are incremental
and small, DERBY-728 would soon become confusing if it had to bear the patches for both server
and client.
> For future reference, some patches have actually been applied in DERBY-728. These **ARE**
also required for the server implementation.

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