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Date: Wed, 2 Apr 2008 12:39:24 -0700 (PDT)
From: "Rahul Akolkar (JIRA)" <jira@apache.org>
To: issues@commons.apache.org
Subject: [jira] Reopened: (COLLECTIONS-242) Add Equator interface for more
 powerful collections
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     [ https://issues.apache.org/jira/browse/COLLECTIONS-242?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Rahul Akolkar reopened COLLECTIONS-242:
---------------------------------------


Could you please fix the svn props for files added and make required changes to your svn client's config? See:

http://markmail.org/message/m65kwvj2mrr6zszf


> 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
>            Assignee: 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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