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https://issues.apache.org/jira/browse/LUCENE-2015?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12771568#action_12771568
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Uwe Schindler commented on LUCENE-2015:
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We cannot apply the patch to ISOLatin1Filter, as it would break indexes already
using it. Because of that we migrated to ASCIIFoldingFilter and kept
ISOLatin1Filter alive. So we should leave it as it is.
To the buffer problem: For easy external use we could also provide a expert API
that works like the current public foldToASCII method, which is memory
efficient. But may also provide String/StringBuilder converters for external
use. Internal it cannot be better as it currently is :-)
> ASCIIFoldingFilter: expose folding logic + small improvements to
> ISOLatin1AccentFilter
> --------------------------------------------------------------------------------------
>
> Key: LUCENE-2015
> URL: https://issues.apache.org/jira/browse/LUCENE-2015
> Project: Lucene - Java
> Issue Type: Improvement
> Components: Analysis
> Reporter: Cédrik LIME
> Priority: Minor
> Attachments: ASCIIFoldingFilter-no_formatting.patch, Filters.patch,
> ISOLatin1AccentFilter.patch
>
>
> This patch adds a couple of non-ascii chars to ISOLatin1AccentFilter (namely:
> left & right single quotation marks, en dash, em dash) which we very
> frequently encounter in our projects. I know that this class is now
> deprecated; this improvement is for legacy code that hasn't migrated yet.
> It also enables easy access to the ascii folding technique use in
> ASCIIFoldingFilter for potential re-use in non-Lucene-related code.
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