Set field value problem

Hi All,
I want to set a field value of a class. I do this in the way of modifying codes in getText() method in XXXItemProvider.java as the red frame in the following picture.
It generates the following problem
But, if I remove the codes, "(NFRSoftgoal)object.setLabel......", it becomes normal.
Can anyone help me solve the problem?
Thanks & Regards,

Comments below.
On 17/07/2015 7:19 PM, Shin-Yi Lin wrote:
> Ed Merks wrote on Fri, 17 July 2015 12:28
>> Comments below.
>>
>> On 17/07/2015 4:40 AM, Shin-Yi Lin wrote:
>>> (1) My model structure (I want to change label attribute.):
>> So the label feature is on a class that's the root of a several other
>> classes...
>> ----> Yes.
>>>
>>> (2.1) Before (Child and parent clouds are undecided. Cloud represents NFRSoftgoal class.):
>> This undecided thing is the default state...
>> -----> That's right.
>>>
>>> (2.2) After (After child cloud changes to satisfy through command, parent cloud changes to satisfy automatically.)
>> Is this via a command that directly modifies the label feature of the
>> "child"? If so, that's the place to modify the state of the parents,
>> e.g., using a compound command that modifies the child as normal, and
>> walks up the parents to modify the parent label also using commands.
>> What, if anything, prevents the "parent" label from being directly
>> changed back to undecided (which is perhaps an inconsistent state for
>> the model)?
>> -----> I change the label feature of "child" through the red frame in the following pictures (This is under run-time application and Sirius environment.):
>>
>>
>> -----> But I don't want to change the label feature of "parent" through the same way, because it should be automatically changed, not manually.
I'm asking what's preventing that from happening? I suppose it doesn't
matter if you've done something so that only a leaf/child can be
directly modified.
>> That's why I modified the code of getText( Object object) function in NFRSoftgoalItemProvide.java under bpmn.edit.
That's not a good idea.
>>
>>
>>
>> -----> What do you mean "via a command" ? I don't know how to change via a command. Could you explain or give any reference for it?
On the child, the set command is created by
org.eclipse.emf.edit.provider.ItemProviderAdapter.createSetCommand(EditingDomain,
EObject, EStructuralFeature, Object) so you can specialize this method
of the child's item provider so that it modifies not only the child's
label feature, but modifies also the parents. All that could be done
with a CompoundCommand that composes all the SetCommands.
>>
>> Thanks & Regards,
>>

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