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https://issues.apache.org/jira/browse/LANG-510?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12752238#action_12752238
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Henri Yandell commented on LANG-510:
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Though...
Could have an indexOf method for CharSequence that IF both string and substring
are String, then it casts to String. That has a pretty minimal cost. Equally
could add optimized code for StrBuilder and StringBuffer too.
That's tempting.
> Convert StringUtils API to take CharSequence
> --------------------------------------------
>
> Key: LANG-510
> URL: https://issues.apache.org/jira/browse/LANG-510
> Project: Commons Lang
> Issue Type: Improvement
> Reporter: Henri Yandell
> Fix For: 3.0
>
>
> Wherever possible, use CharSequence and not String in the StringUtils API.
> substring can go to subSequence inside code. The general substring method can
> be replaced with a subSequence method and substring deprecated(?). One
> question is whether to implement a CharSequence.indexOf type method. Given
> that it's merely a walking method(?!?), this might be quite handy and would
> allow a bunch of StringUtils methods to move over.
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