[collections] IteratorChain(Iterator) should be meta!

[Paul Libbrecht <pa...@activemath.org>]

Hello,

only after a looong quest I realized that new IteratorChain(Iterator) 
will only iterate through the elements of the given iterator instead of 
expecting that each element is an iterator itself through which one 
iterates.

Am I blurred to expect such ?
I suppose that changing this behaviour would be a too strong API 
change... so should one do an IteratorThroughIterators?? I can offer a 
class... if wished.

paul

Re: [collections] IteratorChain(Iterator) should be meta!

[Stephen Colebourne <sc...@btopenworld.com>]

IteratorChain is the right class, but the constructor just adds the one 
iterator.

You could use the Iterator(Collection) constructor which adds a 
collection of Iterators. Perhaps use IteratorUtils.toList to create the 
list?

Alternatively, you could patch IteratorChain to add a factory method 
that takes an iterator and does what you wanted.

Stephen

Paul Libbrecht wrote:
> 
> Hello,
> 
> only after a looong quest I realized that new IteratorChain(Iterator) 
> will only iterate through the elements of the given iterator instead of 
> expecting that each element is an iterator itself through which one 
> iterates.
> 
> Am I blurred to expect such ?
> I suppose that changing this behaviour would be a too strong API 
> change... so should one do an IteratorThroughIterators?? I can offer a 
> class... if wished.
> 
> paul

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Re: [collections] IteratorChain(Iterator) should be meta!

[paul womack <pw...@papermule.co.uk>]

Paul Libbrecht wrote:
> 
> Hello,
> 
> only after a looong quest I realized that new IteratorChain(Iterator) 
> will only iterate through the elements of the given iterator instead of 
> expecting that each element is an iterator itself through which one 
> iterates.
> 
> Am I blurred to expect such ?
> I suppose that changing this behaviour would be a too strong API 
> change... so should one do an IteratorThroughIterators?? I can offer a 
> class... if wished.

I think what you want can be handled nicely by
the (remarkable) ObjectGraphIterator class.

   BugBear

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