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https://issues.apache.org/jira/browse/COLLECTIONS-165?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12580242#action_12580242
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Henri Yandell commented on COLLECTIONS-165:
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Stephen was the one with those concerns though. Then again, his comment above
might predate that.
> 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: 3.4
>
> Attachments: FilteredCollection.java, FilteredList.java,
> FilteredListIterator.java, FilteredMap.java, 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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