[jira] Updated: (DERBY-3936) Add CharacterStreamDescriptor

["Kristian Waagan (JIRA)" <ji...@apache.org>]

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

Kristian Waagan updated DERBY-3936:
-----------------------------------

    Derby Info: [Patch Available]

> Add CharacterStreamDescriptor
> -----------------------------
>
>                 Key: DERBY-3936
>                 URL: https://issues.apache.org/jira/browse/DERBY-3936
>             Project: Derby
>          Issue Type: Sub-task
>          Components: JDBC
>    Affects Versions: 10.5.0.0
>            Reporter: Kristian Waagan
>            Assignee: Kristian Waagan
>            Priority: Minor
>             Fix For: 10.5.0.0
>
>         Attachments: derby-3936-1a-CharacterStreamDescriptor.diff, derby-3936-1b-CharacterStreamDescriptor.diff, derby-3936-2a-temp_fix.diff, derby-3936-3a-javadoc-1.diff, derby-3936-4a-streamref_and_copy.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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