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Setting several primitive values for structural feature [message #1742938]

Thu, 08 September 2016 16:50

Peter Johnsen

Messages: 60
Registered: January 2012

Member

Hi,

Anyone that can help me with this?

I have a list of java.lang.Integer that I want to set as values for a structural feature using reflection. The problem is that the oSet Method in the EObject class only accepts an EList, i.e.

object.eSet( structuraFeature, "integers" );

I hope this makes sense.

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Re: Setting several primitive values for structural feature [message #1742955 is a reply to message #1742938]

Thu, 08 September 2016 20:46

Ed Merks

Messages: 33136
Registered: July 2009

Senior Member

Is it a multi-valued feature? In that case you should use eGet(feature) to fetch the list, and then modify the list as you see fit.

Ed Merks
Professional Support: https://www.macromodeling.com/

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Re: Setting several primitive values for structural feature [message #1742957 is a reply to message #1742938]

Thu, 08 September 2016 21:02

Ed Merks

Messages: 33136
Registered: July 2009

Senior Member

Is it a multi-valued feature? In that case you should use eGet(feature) to fetch the list, and then modify the list as you see fit.

Ed Merks
Professional Support: https://www.macromodeling.com/

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Re: Setting several primitive values for structural feature [message #1743010 is a reply to message #1742957]

Fri, 09 September 2016 13:01

Peter Johnsen

Messages: 60
Registered: January 2012

Member

Ah, thanks a bunch!

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Re: Setting several primitive values for structural feature [message #1743018 is a reply to message #1742957]

Fri, 09 September 2016 13:49

Peter Johnsen

Messages: 60
Registered: January 2012

Member

Doesn't seem to work? The types are correct.

EList<EObject> list = (EList<EObject>)ooo.eGet( structuralFeature );

SimpleAnyType wrapper = XMLTypeFactory.eINSTANCE.createSimpleAnyType();
wrapper.setInstanceType( dataType );
wrapper.setValue( new Integer( 1 ) );
list.add( wrapper );

Exception in thread "main" java.lang.ArrayStoreException: org.eclipse.emf.ecore.xml.type.impl.SimpleAnyTypeImpl
at org.eclipse.emf.common.util.BasicEList.assign(BasicEList.java:124)
at org.eclipse.emf.common.util.BasicEList.addUnique(BasicEList.java:424)

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Re: Setting several primitive values for structural feature [message #1743044 is a reply to message #1743018]

Fri, 09 September 2016 20:22

Ed Merks

Messages: 33136
Registered: July 2009

Senior Member

Peter,

I can't guess what type of list this is. Of course the (EList<EObject>) cast is unchecked as the compiler warns you, so if it's not an EObject list you'll get ArrayStoreExcetions when you try to add the wrong type of object to it. You originally asserted it was a list of Integer, so I'm not sure why you aren't casting to EList<Integer> and adding the Integers to that...

Ed Merks
Professional Support: https://www.macromodeling.com/

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Re: Setting several primitive values for structural feature [message #1743459 is a reply to message #1743044]

Thu, 15 September 2016 14:58

Peter Johnsen

Messages: 60
Registered: January 2012

Member

Thanks for your reply!

Well, I guess I'm confused regarding the wrapper. What I'd like to do is to add a
value to a multi-valued integer list. So, from the code I have the structural feature that has a multi-valued Integer type. So this compiles and executes:

EList<EInteger> list = (EList<EInteger>)o.eGet( structuralFeature );
list.add( 1 );
o.eSet( sf, list );

However, when I inspect the model in the graphical editor, the list is still empty?
Therefore I thought I'd had to use a wrapper? Not sure how.

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Re: Setting several primitive values for structural feature [message #1743464 is a reply to message #1743459]

Thu, 15 September 2016 16:10

Ed Merks

Messages: 33136
Registered: July 2009

Senior Member

Of course if you used the debugger (he's your best friend, don't neglect him) you'd see that the o.eSet is not needed and in fact is bad. The generated eSet is like this:

        getEAnnotations().clear();
        getEAnnotations().addAll((Collection<? extends EAnnotation>)newValue);

So you're adding to the list, clearing the list, and then adding all the things in the list (which is now empty), to the list.

So you can use eSet on a multi-valued feature to replace the contents of the list with new contents, but you don't need to do it that way, you can just get the list, add to it, and you're done.

Ed Merks
Professional Support: https://www.macromodeling.com/

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