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https://issues.apache.org/jira/browse/COLLECTIONS-439?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13573689#comment-13573689
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Thomas Neidhart commented on COLLECTIONS-439:
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The TreeBag uses internally also a TreeMap, which requires that the used
comparator must be consistent with equals, i.e. (compare(x,y) == 0) ==
x.equals(y).
>From your description I understand that your comparator violates this
>requirement, so this is not a bug, but could be an improvement.
The attached bug has a few problems:
* we can not add external dependencies to e.g. jena
* missing test case
> 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: Bug
> Components: Bag
> Affects Versions: 3.2.1
> Reporter: Claude Warren
> Attachments: 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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