Re: [collections] TransformedCollection

[Stephen Colebourne]

The problem is that the collections you pass in (dates) is supposed to 
be decorated. In order to transform the entries on construction there 
would need to be some way to alter the values already in dates, but the 
Collection interface provides no such direct mechanism.

However, it could be done indirectly:
a) Copy input collection to a list
b) Clear input collection
c) Transform each element from the list back into the original collection
If you would like to provide a patch (or just change SVN) to add a new 
static method (decorateTransform?) for doing this on 
TransformedCollection then please go ahead. (A new method is needed as 
the javadoc on the existing decorate method is explicit)

Note, that if you do do this then the new method should be added to all 
the Transformed* classes.

Stephen
Rob Oxspring wrote:
Hi,
I've just been burnt (and not for the first time) by the fact that the 
TransformedCollection doesn't transform the objects that are already in 
the wrapped collection.  For example:

Collection dates = ... // a collection with Date objects in it
Transformer toString = ... // a transformer that calls toString
Collection strings =
    CollectionUtils.transformedCollection(dates,toString);
My intuition tells me that strings should be full of String objects and 
have no Date objects in it but the opposite is true.  Is this the 
intended behaviour or is this a bug?  I'm happy to patch the 
TransformedCollection class but wanted to run it passed people first...

Thanks,
Rob
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