[jira] Issue Comment Edited: (LUCENE-1799) Unicode compression

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[jira] Issue Comment Edited: (LUCENE-1799) Unicode compression

JIRA jira@apache.org

    [ https://issues.apache.org/jira/browse/LUCENE-1799?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12890411#action_12890411 ]

Uwe Schindler edited comment on LUCENE-1799 at 7/20/10 3:49 PM:
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For correctness of code: target.offset = buffer.arrayOffset() + buffer.position();
But for most cases position() will be 0, but this is quite often an error. If you use limit() you have to use position(), else its inconsistent. arrayOffset() gives the offset corresponding to position=0.

And the default factory could be a singleton...

      was (Author: thetaphi):
    For correctness of code: target.offset = buffer.arrayOffset() + buffer.position();
But for most cases position() will be 0, but this is quite often an error. If you use limit() you have to use position(), else its inconsistent. arrayOffset() gives the offset corresponding to position=0.
 

> Unicode compression
> -------------------
>
>                 Key: LUCENE-1799
>                 URL: https://issues.apache.org/jira/browse/LUCENE-1799
>             Project: Lucene - Java
>          Issue Type: New Feature
>          Components: Store
>    Affects Versions: 2.4.1
>            Reporter: DM Smith
>            Priority: Minor
>         Attachments: LUCENE-1799.patch
>
>
> In lucene-1793, there is the off-topic suggestion to provide compression of Unicode data. The motivation was a custom encoding in a Russian analyzer. The original supposition was that it provided a more compact index.
> This led to the comment that a different or compressed encoding would be a generally useful feature.
> BOCU-1 was suggested as a possibility. This is a patented algorithm by IBM with an implementation in ICU. If Lucene provide it's own implementation a freely avIlable, royalty-free license would need to be obtained.
> SCSU is another Unicode compression algorithm that could be used.
> An advantage of these methods is that they work on the whole of Unicode. If that is not needed an encoding such as iso8859-1 (or whatever covers the input) could be used.    

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