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https://issues.apache.org/jira/browse/LUCENE-1799?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Uwe Schindler updated LUCENE-1799:
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Attachment: LUCENE-1799.patch
Here is a 100% legally valid implementation:
- Linking to icu4j-charsets is done dynamically by reflection. If you don't
have ICU4J charsets in your classpath, the attribute throws explaining exception
- We dont need to ship the rather large JAR file with Lucene just for this class
- We dont have legal patent problems as we neither ship the API nor use it
directly
- The backside is that the Test simple prints a warning but passes, so the
class is not tested until you install icu4j-charsets.jar. We can put the JAR
file on hudson, so it can be used during nightly builds. Or we download it
dynamically on build.
I added further improvements to the encoder ittself:
- less variables
- correct error handling for encoding errors
- remove floating point from main loop
> 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, LUCENE-1799.patch, LUCENE-1799.patch,
> LUCENE-1799.patch, 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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