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From "Kristian Waagan (JIRA)" <j...@apache.org>
Subject [jira] Updated: (DERBY-3936) Add CharacterStreamDescriptor
Date Wed, 19 Nov 2008 11:49:44 GMT

     [ https://issues.apache.org/jira/browse/DERBY-3936?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel

Kristian Waagan updated DERBY-3936:

    Fix Version/s:

Thanks Knut Anders.
I committed patch 1b to trunk with revision 718936.

Depending on how things play out, I might consider adding a reference to the stream in the
descriptor object.
I'll leave the issue open until I have a clearer view of how, and where,  the descriptor object
will be used.
If anyone has opinions on keeping a reference to the described stream in the descriptor, please
add a comment.

> Add CharacterStreamDescriptor
> -----------------------------
>                 Key: DERBY-3936
>                 URL: https://issues.apache.org/jira/browse/DERBY-3936
>             Project: Derby
>          Issue Type: Sub-task
>          Components: JDBC
>    Affects Versions:
>            Reporter: Kristian Waagan
>            Assignee: Kristian Waagan
>            Priority: Minor
>             Fix For:
>         Attachments: derby-3936-1a-CharacterStreamDescriptor.diff, derby-3936-1b-CharacterStreamDescriptor.diff
> A set of state information is required about byte streams representing characters to
be able to handle them properly.
> The basic pieces of information are:
>  - is bufferable
>  - is position aware
>  - data offset
>  - current byte position
>  - current char position
>  - byte length
>  - char length
> Additional info:
>  - encoding
>  - max allowed length
>  - bytes per char information
> The information is chosen with UTF8Reader in mind, and the plan is to pass a CharacterStreamDescriptor
instance to the constructor to allow the reader to configure itself appropriately. The information
is expected to be valid only at a specific point in time, as some of it will change as soon
as the reader starts working with the underlying stream.

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