[jira] [Resolved] (COLLECTIONS-830) Add isEmpty() method to Hasher

["Claude Warren (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/COLLECTIONS-830?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Claude Warren resolved COLLECTIONS-830.
---------------------------------------
    Resolution: Won't Fix

HasherCollection to be removed from code base.

> Add isEmpty() method to Hasher
> ------------------------------
>
>                 Key: COLLECTIONS-830
>                 URL: https://issues.apache.org/jira/browse/COLLECTIONS-830
>             Project: Commons Collections
>          Issue Type: Improvement
>          Components: Collection
>    Affects Versions: 4.5
>            Reporter: Claude Warren
>            Assignee: Claude Warren
>            Priority: Minor
>              Labels: bloom-filter
>          Time Spent: 20m
>  Remaining Estimate: 0h
>
> The Hasher interface in the {{bloomfilter}} package does not have a way to determine if the hasher is empty.  For the {{SimpleHasher}} implementation that is not an issue, however, the {{HasherCollection}} can be empty, and there is no guarantee that any other implementation of Hasher may have an empty state.
> I have a use case where a {{Hasher}} is passed to a search method in a multidimensional Bloom filter.  If the hasher is empty then we are doing the equivalent of a table scan in a database.
> It is possible to determine if the hasher is not empty by something like
> {quote}{{boolean[] notEmpty = boolean[1];}}
> hasher.indices( shape ).forEachIndex( i ->\{notEmpty[0]=true;return false;});
> {quote}
> And then checking notEmpty[0].



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