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https://issues.apache.org/jira/browse/COLLECTIONS-165?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13442202#comment-13442202
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Brent Worden commented on COLLECTIONS-165:
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There might be some licensing concerns regarding the patches attached to this
issue. The original source seems to have been taken from an academic friendly
license that is incompatible with the Apache license.
> Filtered Maps, Lists, and Sets
> ------------------------------
>
> Key: COLLECTIONS-165
> URL: https://issues.apache.org/jira/browse/COLLECTIONS-165
> Project: Commons Collections
> Issue Type: New Feature
> Components: List, Map, Set
> Affects Versions: 3.1
> Environment: Operating System: other
> Platform: Other
> Reporter: Venkatesh Prasad Ranganath
> Priority: Minor
> Fix For: 4.x
>
> Attachments: ASF.LICENSE.NOT.GRANTED--FilteredCollection.java,
> ASF.LICENSE.NOT.GRANTED--FilteredListIterator.java,
> ASF.LICENSE.NOT.GRANTED--FilteredList.java,
> ASF.LICENSE.NOT.GRANTED--FilteredMap.java,
> ASF.LICENSE.NOT.GRANTED--FilteredSet.java
>
>
> In the project I work I have found that it would be efficient (at a small cost
> of memory) to use filtered maps, lists, and sets instead of creating a new
> copy
> of the decorated entities that contains only the filtered elements.
> To begin with I have implemented a FilteredMap and plan to implement
> FilteredList and FilteredSet. I will post the code for these in a couple of
> days and it would be great if Collections library could accept these
> contributions.
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