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https://issues.apache.org/jira/browse/LANG-922?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13800142#comment-13800142
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Benedikt Ritter commented on LANG-922:
--------------------------------------
{quote}
Thus old BooleanUtils.xor(args) would now be ArrayUtils.count(true, args) == 1.
{quote}
IMHO we should not change BooleanUtils.xor(boolean...) back the old behavior
(which was counting true values), because it was simply wrong :-) You can have
a boolean array with more than one true value and still the result of XOR can
be true:
{code}
true ^ true ^ true
= false ^ true
= true
{code}
So the first thing to do was fixing this bug. Now we need to decide if we want
to preserve the old behavior and possibly add other convenience methods like
isAnyTrue, isExactlyOneFalse and the like.
> 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, Discussion
>
>
> 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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