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https://issues.apache.org/jira/browse/COLLECTIONS-439?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13655840#comment-13655840
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Claude Warren commented on COLLECTIONS-439:
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While the MultiValueMap may do the same thing.... I have not looked. This is
an implementation of Bag and operates like a non-unique index on a database
table. (In fact that is what I use it to emulate)
Asking if this is useful because it has similar functionality to MultiValueMap
is like asking if Queue should be included when LinkedList can be used.
You use Queue because it provides a clue to any developers reading your code
what you are trying to do -- what you are thinking. The same with Bag vs
MultiValueMap.
I think it is a valid and useful addition to the collection and vote to include
it. But then I contributed it so I would think that. :)
> TreeBag with comparator does not store non-key duplicates.
> ----------------------------------------------------------
>
> Key: COLLECTIONS-439
> URL: https://issues.apache.org/jira/browse/COLLECTIONS-439
> Project: Commons Collections
> Issue Type: Improvement
> Components: Bag
> Affects Versions: 3.2.1
> Reporter: Claude Warren
> Fix For: 4.x
>
> Attachments: COLLECTIONS-439.tar.gz, SortedBag.java
>
>
> When storing objects that are sorted by a Comparator, if the differences in
> the objects are not in the comparator the same version of the object is
> returned. I expected that the sorted bag would work like a DB table with a
> non-unique key -- ordered but duplicate only determined by Object.equals().
> I have implemented this type of bag using a TreeMap of List. My
> implementation uses the Jena ExtendedIterator to make building the iterator()
> and array() methods easier.
> Will attach the code.
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