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https://issues.apache.org/jira/browse/COLLECTIONS-242?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12479762
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Stephen Colebourne commented on COLLECTIONS-242:
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I think such an interface is a useful extension to the collections framework.
> Add Equator interface for more powerful collections
> ---------------------------------------------------
>
> Key: COLLECTIONS-242
> URL: https://issues.apache.org/jira/browse/COLLECTIONS-242
> Project: Commons Collections
> Issue Type: Improvement
> Components: Comparator
> Reporter: Stephen Kestle
> Fix For: Generics
>
>
> Java has Comparable and Comparator to compare objects, and objects have an
> equals() method. But there is no interface for when an object has multiple
> ways of being equal.
> e.g.: an database object that has a name, code and a value. Equality could be
> based on:
> * database id
> * code
> * name and code
> * case-insensitive name
> When extended to collections, this allows us to search for specific
> values (with an EqualsPredicate that takes an Equator), and implement
> Maps and Sets that use specific equators to determine uniqueness.
> I propose that it has two methods:
> boolean equate();
> int hash();
> I shall upload some files when I next get some time.
> NB: This ticket is a summary of the email conversation begun on 5 Jan 2007:
> "equator interface"
> (http://archives.devshed.com/forums/java-118/equator-interface-2126195.html).
> Stephen C made reference there to creating a FlexiMap, but in my mind,
> that's additional to this issue (this interface still needs to be created to
> be able to stand alone).
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