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From Shai Erera <>
Subject Add hasFiles/isEmpty to Directory
Date Thu, 18 Feb 2010 14:04:54 GMT

Does it make sense to add a hasFiles/isEmpty method to Directory which will
return true if the Directory has any files? Today, if someone needs to know
that (like me :)), he has to call listAll().length > 0. But listAll() can be
a bit expensive for this sort of request.

If it makes sense, then in order for Directory to still be back-compat we
can implement it by calling listAll().length > 0, however provide a more
efficient implementations in sub-classes. I've checked and it looks like all
sub-classes can implement it very efficiently.

Also, Directory.listAll()'s contract is not clear - what should it return if
it's empty - null or String[0]? I think it'd be good if we specify it,
though the specification itself might break back-compat with existing
Directory implementations. None of the out-of-the-box ones (all seem to
return an empty array), but perhaps apps-specific implementations.

I can create an issue and post a patch if it makes sense (and interests


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