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Posted to notifications@groovy.apache.org by "Bruno Bowden (JIRA)" <ji...@apache.org> on 2015/06/30 21:38:05 UTC
[jira] [Commented] (GROOVY-3493) Cannot override methods via
metaclass that are part of an interface implementation
[ https://issues.apache.org/jira/browse/GROOVY-3493?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14608937#comment-14608937 ]
Bruno Bowden commented on GROOVY-3493:
--------------------------------------
Workaround to override interface methods via metaclass. Similar to what toddg reported back in 2009. Here's a working example that can be used to workaround this. Note that this modifies the class rather than a specific instance, which the original reporter was trying to do.
metaclass modification BEFORE construction:
{code}
interface I {
def doIt()
}
class T implements I {
def doIt() { true }
}
I.metaClass.doIt = { -> false }
T t = new T()
assert !t.doIt()
{code}
metaclass modification AFTER construction:
{code}
interface I {
def doIt()
}
class T implements I {
def doIt() { true }
}
T t = new T()
// Removing either of the following two lines breaks this
I.metaClass.doIt = { -> false }
t.metaClass.doIt = { -> false }
assert !t.doIt()
{code}
> Cannot override methods via metaclass that are part of an interface implementation
> ----------------------------------------------------------------------------------
>
> Key: GROOVY-3493
> URL: https://issues.apache.org/jira/browse/GROOVY-3493
> Project: Groovy
> Issue Type: Bug
> Components: groovy-runtime
> Affects Versions: 1.6.2
> Reporter: Luke Daley
> Priority: Critical
>
> The following works...
> {code}
> class T {
> def doIt() { true }
> }
> def t = new T()
> assert t.doIt()
> t.metaClass.doIt = { -> false }
> assert !t.doIt()
> {code}
> But this fails...
> {code}
> interface I {
> def doIt()
> }
> class T implements I {
> def doIt() { true }
> }
> def t = new T()
> assert t.doIt()
> t.metaClass.doIt = { -> false }
> assert !t.doIt()
> {code}
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