Home » Modeling » EMF » EObjectObservableList in EMF Databinding 1.1
| EObjectObservableList in EMF Databinding 1.1 [message #493120] |
Fri, 23 October 2009 09:34  |
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Hi all,
using EObjectObservableList I stepped over the constructor:
public EObjectObservableList(Realm realm, EObject eObject,
EStructuralFeature eStructuralFeature)
{
super(realm, (EList< ? >)eObject.eGet(eStructuralFeature),
eStructuralFeature);
this.eObject = eObject;
this.eStructuralFeature = eStructuralFeature;
}
The last parameter in super call should be the element type of the
IObservableList I guess. (see JavaDoc for
org.eclipse.core.databinding.observable.list.IObservableList .getElementType())
So it looks like the ElementType of the EObjectObservableList is ever
EStructuralFeature and not the feature type. I think it should be
eStructuralFeature.getEType().
Or am I missing something?
Best Regards,
Dennis.
+Dennis Huebner
Get professional support from the Xtext committers at www.typefox.io
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| Re: EObjectObservableList in EMF Databinding 1.1 [message #493136 is a reply to message #493120] |
Fri, 23 October 2009 10:51  |
 Ed Merks
Messages: 33140
Registered: July 2009 |
Senior Member |
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Dennis,
Knowing just the type of the value isn't enough information. The
multiplicity of the feature affects whether you get a list or just a
single value and the feature includes constraints, such as the upper and
lower bound, so generally use the feature everywhere.
Dennis Hübner wrote:
> Hi all,
> using EObjectObservableList I stepped over the constructor:
> public EObjectObservableList(Realm realm, EObject eObject,
> EStructuralFeature eStructuralFeature)
> {
> super(realm, (EList< ? >)eObject.eGet(eStructuralFeature),
> eStructuralFeature);
> this.eObject = eObject;
> this.eStructuralFeature = eStructuralFeature;
> }
>
> The last parameter in super call should be the element type of the
> IObservableList I guess. (see JavaDoc for
> org.eclipse.core.databinding.observable.list.IObservableList .getElementType())
>
>
> So it looks like the ElementType of the EObjectObservableList is ever
> EStructuralFeature and not the feature type. I think it should be
> eStructuralFeature.getEType().
> Or am I missing something?
>
> Best Regards,
> Dennis.
Ed Merks
Professional Support: https://www.macromodeling.com/
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| Re: EObjectObservableList in EMF Databinding 1.1 [message #493151 is a reply to message #493136] |
Fri, 23 October 2009 12:01 |
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Hello Ed,
in my case:
I bind an upper bound EStructuralFeature, type is i.e. EString, to a
whatever swt list control. So I create an
EditingDomainEObjectObservableList(domain, someEObject,
myUpperBoundFeature). Cause it's an *ObservableList we know that it's an
upper bound Feature and the element type should be EString I suppose.
Maybe I just misunderstood the meaning of getElementType() method or the
JavaDoc is not clear enough :)
Thanks,
Dennis.
Ed Merks schrieb:
> Dennis,
>
> Knowing just the type of the value isn't enough information. The
> multiplicity of the feature affects whether you get a list or just a
> single value and the feature includes constraints, such as the upper and
> lower bound, so generally use the feature everywhere.
>
>
> Dennis Hübner wrote:
>> Hi all,
>> using EObjectObservableList I stepped over the constructor:
>> public EObjectObservableList(Realm realm, EObject eObject,
>> EStructuralFeature eStructuralFeature)
>> {
>> super(realm, (EList< ? >)eObject.eGet(eStructuralFeature),
>> eStructuralFeature);
>> this.eObject = eObject;
>> this.eStructuralFeature = eStructuralFeature;
>> }
>>
>> The last parameter in super call should be the element type of the
>> IObservableList I guess. (see JavaDoc for
>> org.eclipse.core.databinding.observable.list.IObservableList .getElementType())
>>
>>
>> So it looks like the ElementType of the EObjectObservableList is ever
>> EStructuralFeature and not the feature type. I think it should be
>> eStructuralFeature.getEType().
>> Or am I missing something?
>>
>> Best Regards,
>> Dennis.
+Dennis Huebner
Get professional support from the Xtext committers at www.typefox.io
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| Re: EObjectObservableList in EMF Databinding 1.1 [message #493176 is a reply to message #493147] |
Fri, 23 October 2009 13:11 |
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Hi Tom!
> Is this causing you any problems?
I noticed any so far, just wonder about the implementation.
Thanks,
Dennis.
Tom Schindl schrieb:
> Hi,
>
> The reason that the type in Eclipse Databinding is an Object and not an
> Class is that technologies like EMF can provide more clever conversion,
> ... .
>
> So we are using EStructuralFeature as the type where ever e.g.
> JavaBeanBindings uses Class. You should not create instance of this
> class your own BTW but go through the factories. I was on the way to
> deprecate them in the last cycle but was too late.
>
> Is this causing you any problems?
>
> Tom
>
> Dennis Hübner schrieb:
>> Hi all,
>> using EObjectObservableList I stepped over the constructor:
>> public EObjectObservableList(Realm realm, EObject eObject,
>> EStructuralFeature eStructuralFeature)
>> {
>> super(realm, (EList< ? >)eObject.eGet(eStructuralFeature),
>> eStructuralFeature);
>> this.eObject = eObject;
>> this.eStructuralFeature = eStructuralFeature;
>> }
>>
>> The last parameter in super call should be the element type of the
>> IObservableList I guess. (see JavaDoc for
>> org.eclipse.core.databinding.observable.list.IObservableList .getElementType())
>>
>>
>> So it looks like the ElementType of the EObjectObservableList is ever
>> EStructuralFeature and not the feature type. I think it should be
>> eStructuralFeature.getEType().
>> Or am I missing something?
>>
>> Best Regards,
>> Dennis.
+Dennis Huebner
Get professional support from the Xtext committers at www.typefox.io
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