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https://issues.apache.org/jira/browse/LANG-293?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12742241#action_12742241
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Henri Yandell commented on LANG-293:
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I created a LookupTranslator concept, and the performance sucked mightily :)
> StringEscapeUtils.unescape* can be faster
> -----------------------------------------
>
> Key: LANG-293
> URL: https://issues.apache.org/jira/browse/LANG-293
> Project: Commons Lang
> Issue Type: Improvement
> Affects Versions: Nightly Builds
> Reporter: Stepan Koltsov
> Fix For: 3.0
>
> Attachments:
> commons-lang-unescape-performace2-stepancheg-2006-10-31.diff,
> EntitiesPerformance2TestSecret.java
>
>
> Typical string that need to be unescaped contains almost no XML entities, so
> copying input string to output buffer char by char is slow.
> I've refactored Entities.unescape() so it works faster. Going to submitting
> patch and tests.
> Patch contains both hacked and original versions of unescape, to run tests.
> Test shows that performance remains same on short strings, and much better or
> large strings with rare entities.
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