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https://issues.apache.org/jira/browse/LANG-922?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13799319#comment-13799319
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Sebb commented on LANG-922:
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bq. To implement the idea of isExactlyOneTrue() you would have to scan the
entire array.
Not true; the scan can be aborted as soon as a second true entry is found.
And again, in the majority case it would be possible to terminate the scan
early for almost all cases (would only need to scan the whole array if all the
true values were at the end and there was only just a majority)
> Add isOneTrue(booleans...) to BooleanUtils to preserve old behavior of
> BooleanUtils.xor(booleans...)
> ----------------------------------------------------------------------------------------------------
>
> Key: LANG-922
> URL: https://issues.apache.org/jira/browse/LANG-922
> Project: Commons Lang
> Issue Type: Bug
> Components: lang.*
> Reporter: Benedikt Ritter
> Assignee: Benedikt Ritter
> Fix For: 3.2
>
>
> The old implementation (prior to r1532476) of BooleanUtils.xor(boolean...)
> checked if the provided array contained exactly one boolean with value true.
> This was changed because it is not the correct behavior for an XOR operation.
> To preserve the behavior we should add BooleanUtils.isOneTrue(boolean...) and
> BooleanUtils.isOneTrue(Boolean...) (and possibly the equivalents for
> isOneFalse).
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