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From "John Hunsley (JIRA)" <j...@apache.org>
Subject [jira] Created: (COLLECTIONS-263) Extend the MultiHashMap to create an object filter by value of given field
Date Wed, 29 Aug 2007 22:06:36 GMT
Extend the MultiHashMap to create an object filter by value of given field
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                 Key: COLLECTIONS-263
                 URL: https://issues.apache.org/jira/browse/COLLECTIONS-263
             Project: Commons Collections
          Issue Type: New Feature
          Components: KeyValue, Map
    Affects Versions: 3.2, 3.1
            Reporter: John Hunsley
            Priority: Minor


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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