Martijn,
here Java is not safe as a language. Yo're able to invoke overrided methods
on non-completely constructed objects.
from my perspective it is a regular case in Wicket:
class SampleComponent extends ... {
String parameter;
SampleComponent(String id, String parameter) {
super(id);
this.parameter = parameter;
}
// method is called from within superconstructor
@Override
void createAdditionalComponents(RepeatingView rv) {
useSomehow(parameter);
}
}
I know two approaches to work around:
- onBeforeRender
- a closure as a constructor formal parameter.
But the latter does not help with built-in components.
If Wicket does not help us with adding appropriate method for
second-step-initialization it should document it in wiki, javadoc and books
"dear user, when overriding methods, beware using of yet unassigned
constructor parameters". Hmm ... sounds stupid :)
Martijn Dashorst wrote:
>
> This has been discussed till death previously and we have excluded it
> from our roadmap. We will never have an init() method for components.
> Gossling gave us a Constructor to initialize your Objects.
>
> Search and read the archives if you want more information on the subject.
>
> Martijn
>
> On Fri, May 15, 2009 at 12:36 AM, Juan G. Arias <[email protected]>
> wrote:
>> It would be very nice to add a new phase for component creation, like I
>> said, an init() or createContent().
>> Is there a JIRA issue for that?
>> If yes, I will vote for it and suggest to change the name to something
>> _not_
>> related to the rendre phase.
>>
>> Thanks!
>> Juan
>>
>>
>> On Thu, May 14, 2009 at 3:31 PM, Daniel Stoch
>> <[email protected]>wrote:
>>
>>> I think you can use hasBeenRendered() method instead of custom boolean
>>> flag.
>>>
>>> --
>>> Daniel
>>>
>>> On 2009-05-14, at 20:15, Jeremy Thomerson wrote:
>>>
>>> You could probably do it in onBeforeRender - but you would need to
>>>> keep a boolean flag to check if it's the first render so that you
>>>> don't recreate them on a second render.... There was talking of
>>>> adding an onBeforeFirstRender method, but I don't think it's happened
>>>> yet - you could look for the method to see if I'm wrong.
>>>>
>>>> --
>>>> Jeremy Thomerson
>>>> http://www.wickettraining.com
>>>>
>>>
>>>
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>>
>
>
>
> --
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