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https://issues.apache.org/jira/browse/LUCENE-1166?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Thomas Peuss updated LUCENE-1166:
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    Attachment: CompoundTokenFilter.patch

* Minor bugfix in DictionaryCompoundWordFilter: it was not using the 
_maxSubwordSize_ parameter
* Major performance improvement for the DictionaryCompoundWordTokenFilter: we 
now convert all dictionary strings to lower case before adding them to the 
CharArraySet and set the _ignoreCase_ parameter of CharArraySet to false. The 
filter makes a lower case copy of the token before it starts working on it. 
This avoids many _toLowerCase()_ calls in CharArraySet.
* Minor performance improvement for the HyphenationCompoundWordTokenFilter: see 
above

> A tokenfilter to decompose compound words
> -----------------------------------------
>
>                 Key: LUCENE-1166
>                 URL: https://issues.apache.org/jira/browse/LUCENE-1166
>             Project: Lucene - Java
>          Issue Type: New Feature
>          Components: Analysis
>            Reporter: Thomas Peuss
>            Assignee: Grant Ingersoll
>            Priority: Minor
>         Attachments: CompoundTokenFilter.patch, CompoundTokenFilter.patch, 
> CompoundTokenFilter.patch, CompoundTokenFilter.patch, 
> CompoundTokenFilter.patch, CompoundTokenFilter.patch, 
> CompoundTokenFilter.patch, CompoundTokenFilter.patch, 
> CompoundTokenFilter.patch, CompoundTokenFilter.patch, de.xml, hyphenation.dtd
>
>
> A tokenfilter to decompose compound words you find in many germanic languages 
> (like German, Swedish, ...) into single tokens.
> An example: Donaudampfschiff would be decomposed to Donau, dampf, schiff so 
> that you can find the word even when you only enter "Schiff".
> I use the hyphenation code from the Apache XML project FOP 
> (http://xmlgraphics.apache.org/fop/) to do the first step of decomposition. 
> Currently I use the FOP jars directly. I only use a handful of classes from 
> the FOP project.
> My question now:
> Would it be OK to copy this classes over to the Lucene project (renaming the 
> packages of course) or should I stick with the dependency to the FOP jars? 
> The FOP code uses the ASF V2 license as well.
> What do you think?

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