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From "Matt Benson (JIRA)" <>
Subject [jira] Commented: (LANG-588) Create a basic Pair<L, R> class
Date Sun, 07 Feb 2010 05:48:28 GMT


Matt Benson commented on LANG-588:

I'll respond to your first three comments in order:

* RE Javadoc of static methods:  What are you looking for, beyond completing the @param tags
such that checkstyle is happy?
* RE @since:  Okay.
* RE static imports:  don't know what to say; 'tis a matter of opinion.  If as a community
we turn out to fall in favor of not using static imports I will abide.

WRT MatchedPair<T> as Iterable<T>, to be honest MatchedPair exists, in my mind,
mostly because only when the L and R types of Pair are the same can we provide a typed Iterator.
 As for the tree walker concept, that never occurred to me though I suppose I can see where
you're coming from now that you mention it.  Perhaps your impression of a Pair as a LISP concept
and my lack of similar background account for the difference in perspective.  However, as
you mentioned this would only really work if we sacrifice type-safety by making Pair Iterable<Object>,
and in that case it could be argued that the whole notion of iterating over nested Iterables
in depth-first or breadth-first fashion could be extracted to a completely separate class,
and be a more versatile approach into the bargain, no?

> Create a basic Pair<L, R> class
> -------------------------------
>                 Key: LANG-588
>                 URL:
>             Project: Commons Lang
>          Issue Type: New Feature
>          Components: lang.*
>            Reporter: Matt Benson
>             Fix For: 3.0
>         Attachments:,,,
> [lang] is the perfect place to provide a basic typed Pair class.  I have written such
a class for my employer (who hasn't?) but can/will rewrite blind to avoid IP issues.  I think
it's also nice to go ahead and extend this to MatchedPair<T> extends Pair<T, T>
as well.

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