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Posted to notifications@groovy.apache.org by "Paul King (JIRA)" <ji...@apache.org> on 2016/10/05 11:09:20 UTC
[jira] [Commented] (GROOVY-7954) Equal Operator for Classes
implementing Comparable not Working on Interfaces
[ https://issues.apache.org/jira/browse/GROOVY-7954?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15548410#comment-15548410 ]
Paul King commented on GROOVY-7954:
-----------------------------------
Do you have a self-contained example illustrating something close to your situation?
> 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
>
> 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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