[ https://issues.apache.org/jira/browse/LANG-510?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12752238#action_12752238 ]

Henri Yandell commented on LANG-510:
------------------------------------

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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