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From "Thomas Neidhart (JIRA)" <>
Subject [jira] [Commented] (COLLECTIONS-439) TreeBag with comparator does not store non-key duplicates.
Date Thu, 07 Feb 2013 17:33:12 GMT


Thomas Neidhart commented on COLLECTIONS-439:

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:
>             Project: Commons Collections
>          Issue Type: Bug
>          Components: Bag
>    Affects Versions: 3.2.1
>            Reporter: Claude Warren
>         Attachments:
> 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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