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https://issues.apache.org/jira/browse/LUCENE-871?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12521344
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Stanislaw Osinski commented on LUCENE-871:
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I've just quickly decompiled the ISOLatin1AccentFilter.class from lucene 2.2.0
distribution -- the switch statement got compiled into a tableswitch -- the
faster of the two options (but with larger code size).
Yonik: from what I understand from the JVM spec, it is the tableswitch that is
O(1) and lookupswitch should be at least O(log(N)) (binary search through N
case values).
> ISOLatin1AccentFilter a bit slow
> --------------------------------
>
> Key: LUCENE-871
> URL: https://issues.apache.org/jira/browse/LUCENE-871
> Project: Lucene - Java
> Issue Type: Bug
> Components: Analysis
> Affects Versions: 1.9, 2.0.0, 2.0.1, 2.1, 2.2
> Reporter: Ian Boston
> Assignee: Michael McCandless
> Fix For: 2.3
>
> Attachments: fasterisoremove1.patch, fasterisoremove2.patch,
> ISOLatin1AccentFilter.java.patch, LUCENE-871.take4.patch
>
>
> The ISOLatin1AccentFilter is a bit slow giving 300+ ms responses when used in
> a highligher for output responses.
> Patch to follow
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