[jira] [Closed] (GROOVY-7954) Equal Operator for Classes implementing Comparable not Working on Interfaces

["Paul King (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/GROOVY-7954?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Paul King closed GROOVY-7954.
-----------------------------

> Equal Operator for Classes implementing Comparable not Working on Interfaces
> ----------------------------------------------------------------------------
>
>                 Key: GROOVY-7954
>                 URL: https://issues.apache.org/jira/browse/GROOVY-7954
>             Project: Groovy
>          Issue Type: Bug
>          Components: groovy-runtime
>    Affects Versions: 2.4.7
>         Environment: Windows 10, Java 7
>            Reporter: Josef
>            Assignee: Paul King
>            Priority: Major
>             Fix For: 3.0.0-beta-1, 2.5.7
>
>         Attachments: Example.zip
>
>          Time Spent: 1h 10m
>  Remaining Estimate: 0h
>
> Using the equal operator "==" on two instances A and B does not work correctly, when
> 1) A and B implement the same interface I1 but are not the same class and
> 2) interface I1 extends the "Comparable" interface.
> The checking in DefaultTypeTransformation.compareToWithEqualityCheck(...) checks for assignable classes, and uses compareTo when assignable on class level (which is not the case for instance A and B). But it does not check on interface level.
> That way, calling the compareTo(..) method is not performed.
> In my use case, class A and B are actually considered equal, even so their concrete implementation is different. And the compareTo(...) method would actually return 0. 
> How about doing real equality checking instead of returning -1 close to the end of method DefaultTypeTransformation.compareToWithEqualityCheck(...):
> ...
> if (equalityCheckOnly) {
>     return left.equals(right) ? 0 : -1;
> }
> throw new GroovyRuntimeException("Cannot compare " + left.getClass().getName() + " with value '" +
>                 left + "' and " + right.getClass().getName() + " with value '" + right + "'");
> Thanks for your effort.



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