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Posted to issues@commons.apache.org by "Thomas Neidhart (JIRA)" <ji...@apache.org> on 2013/04/18 23:20:16 UTC
[jira] [Updated] (COLLECTIONS-263) Extend the MultiHashMap to
create an object filter by value of given field
[ https://issues.apache.org/jira/browse/COLLECTIONS-263?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Thomas Neidhart updated COLLECTIONS-263:
----------------------------------------
Fix Version/s: 4.0
> Extend the MultiHashMap to create an object filter by value of given field
> --------------------------------------------------------------------------
>
> Key: COLLECTIONS-263
> URL: https://issues.apache.org/jira/browse/COLLECTIONS-263
> Project: Commons Collections
> Issue Type: New Feature
> Components: KeyValue, Map
> Affects Versions: 3.1, 3.2
> Reporter: John Hunsley
> Priority: Minor
> Fix For: 4.0
>
> Attachments: CollectionFilter.java, CollectionFilterTest.java
>
>
> I purpose extending the MultiHashMap to create an object filter which will filter a given collection of objects by a given field value.
> For example:
> I have a collection of 5 objects of class X. X has an int field i as shown below:
> x1 i = 1
> x2 i = 2
> x3 i = 2
> x4 i = 5
> x5 i = 5
> The extended MultiHashMap will filter those objects by the field i and store each sorted object into the map using the value of the field, i, as the key, such that the resulting MultiHashMap looks as follows:
> key | values
> 1 | x1
> 2 | x2, x3
> 5 | x4, x5
> I have a class which does this and I find it invaluable in my day to day work. I don't Collections has a similar one.
> Kind regards,
> John.
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