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Unique flags in generated ecore model file [message #731030]

Thu, 29 September 2011 18:21

Simon Schwichtenberg

Messages: 127
Registered: September 2011

Senior Member

hi,

i am working on a integration of a xtext editor with gmf. i generate the ecore model and load it in the gmfmap file. when i try to "create generator model" an error occurs while validation:
"All references are unique in EMF due to the current code generation"

i replaced all occurences of unique="false" with unique="true". then the validation succeed and i can generate the gmf editor and run it.

is that practice okay or will that cause errors?
how can i force that the unique flags are set properly during the ecore generation?

is this error caused by inherited classes? i use some of these pattern in my xtext grammar:

SuperClass:
 ClassA
|ClassB
;

ClassA:
(operations+=Operation)*
;

ClassB:
(operations+=Operation)*
;

Operation:
...
;

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Re: Unique flags in generated ecore model file [message #731047 is a reply to message #731030]

Thu, 29 September 2011 18:52

Christian Dietrich

Messages: 14665
Registered: July 2009

Senior Member

Hi,

which is the reference that is not unique?
having a look at org.eclipse.xtext.xtext.ecoreInference.EClassifierInfo sourcecode ereferences should be unique=true

~Christian

Twitter : @chrdietrich
Blog : https://www.dietrich-it.de

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Re: Unique flags in generated ecore model file [message #731060 is a reply to message #731047]

Thu, 29 September 2011 19:58

Simon Schwichtenberg

Messages: 127
Registered: September 2011

Senior Member

first thing i should mention: the error "All references are unique in EMF due to the current code generation" is located at the gmfgen file (showed in problems view, no location given).

Quote:

which is the reference that is not unique?

whenever the unique flag is generated into the file, it has the value "false". it seems that all ereferences and eattributes with the same cross reference target are set to unique=false.

the references are multiple, are no containments and reference to an EClass. here is some portion of the ecore model and the corresponding grammar:

    <eStructuralFeatures xsi:type="ecore:EReference" name="inputs" unique="false"
        upperBound="-1" eType="ecore:EClass platform:/resource/de.upb.swt.xkaos/src-gen/de/upb/swt/xkaos/Xkaos.ecore#//Object"/>
    <eStructuralFeatures xsi:type="ecore:EReference" name="outputs" unique="false"
        upperBound="-1" eType="ecore:EClass platform:/resource/de.upb.swt.xkaos/src-gen/de/upb/swt/xkaos/Xkaos.ecore#//Object"/>

Operation:
	'Operation' name=ID '{' 
		'Input' inputs+=[Object] (',' inputs+=[Object])* ';' 
		'Output' outputs+=[Object] (',' outputs+=[Object])* ';'
[...]
	'}'
;

Object:
[...]
;

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Re: Unique flags in generated ecore model file [message #731070 is a reply to message #731060]

Thu, 29 September 2011 20:38

Christian Dietrich

Messages: 14665
Registered: July 2009

Senior Member

Hi,

it makes sense to me that those crossreferences are marked as not unique. why does GMF have a problem with this?
maybe youll get an answer in the GMF group/forum.

~Christian

Twitter : @chrdietrich
Blog : https://www.dietrich-it.de

[Updated on: Thu, 29 September 2011 20:40]

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