[news.eclipse.platform] Re: [DataBinding] JavaBeansObservable not updati

["Masroor Ahmad" <masroor.ahmad@xxxxxxxxxxxxxxxxxxxx>]

Thanks for the reply.

I see, to solve this one has to change API code or subclass.
The original API code:

public class JavaBeanObservableList  extends ObservableList implements
  IBeanObservable {
...
    updateWrappedList(Arrays.asList(getValues()));
...
}

Regards,
Masroor

> Arrays.asList returns a list that is *backed* by the passed in array. 
> Since arrays cannot change length, neither can the list.  To make the list 
> fully modifiable, try using an ArrayList with the copy constructor:
>
> list = new ArrayList(Arrays.asList(array));
>
> Matthew
>
> Masroor Ahmad wrote:
>> Hello,
>> during development with the databinding framework I found a strange 
>> behaviour of the JavaBeansObservable (M20070822-0800):
>>
>> Suppose we run the following simple code:
>>
>> ModelBean modelBean = new ModelBean();
>> ModelBean targetBean = new ModelBean();
>>
>> IObservableList modelBeanObservableList = 
>> BeansObservables.observeList(Realm.getDefault(), modelBean, "list", 
>> String.class);
>> IObservableList targetBeanObservableList = 
>> BeansObservables.observeList(Realm.getDefault(), targetBean, "list", 
>> String.class);
>>
>> DataBindingContext bindingContext = new DataBindingContext();
>> bindingContext.bindList(targetBeanObservableList, 
>> modelBeanObservableList, null, null);
>>
>> modelBean.add("Str 1");
>> modelBean.clear();
>> targetBean.add("Str 2");
>> for(Object o : modelBean.getList()){
>>  System.out.println(o);
>> }
>>
>> ModelBean has a simple array list containing strings and clear() resets 
>> the list. Any other modification of the list can be imagined.
>> One would expect the console to output: "Str2". But surprisingly there is 
>> no output at all - the model was not updated.
>> When I debugged the code of JavaBeansObservable I found out the place, 
>> where the underlying writeableList is updated:
>>
>> public void add(int index, Object element) {
>> ...
>>  wrappedList.add(index, element);
>> ...
>> }
>>
>> But this line throws an exception (UnsupportedOperationException?) as 
>> wrappedList is not of type ArrayList but Arrays$ArrayList.
>>
>> I question myself, what did I wrong?
>>
>> Nice Greetings,
>> Masroor