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[xtend] bidrectional references not set with two ecore models [message #625843]

Wed, 22 September 2010 10:36

Richard Wood

Messages: 29
Registered: January 2010

Junior Member

Hello

I have two ecore models where one extends from the other.

I am trying to set a bidirectional reference between two elements with xtend, which works fine if I would be using only one ecore model.

PPP and AAA are elements of model Base
PPP references AAA
BBB is an element of model Extended
BBB extends from AAA

In xtend the following code

let bbb = new BBB :
bbb.setPpp(new PPP)

creates an error message

The value of type 'org.eclipse.emf.ecore.impl.EClassImpl@48edb5 (name: PPP) (instanceClassName: null) (abstract: false, interface: false)' must be of type 'org.eclipse.emf.ecore.impl.EClassImpl@1049d3 (name: PPP) (instanceClassName: null) (abstract: false, interface: false)'

Any help would be appreciated
Thanks
Richard

Ecore models attached

<?xml version="1.0" encoding="UTF-8"?>
<ecore:EPackage xmi:version="2.0"
    xmlns:xmi="http://www.omg.org/XMI" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xmlns:ecore="http://www.eclipse.org/emf/2002/Ecore" name="Base"
    nsURI="http:///Base.ecore" nsPrefix="Base">
  <eClassifiers xsi:type="ecore:EClass" name="AAA">
    <eStructuralFeatures xsi:type="ecore:EReference" name="ppp" ordered="false" unique="false"
        eType="#//PPP" eOpposite="#//PPP/aaa"/>
    <eStructuralFeatures xsi:type="ecore:EAttribute" name="name" ordered="false" lowerBound="1"
        eType="ecore:EDataType http://www.eclipse.org/emf/2002/Ecore#//EString"/>
  </eClassifiers>
  <eClassifiers xsi:type="ecore:EClass" name="PPP">
    <eStructuralFeatures xsi:type="ecore:EReference" name="aaa" ordered="false" unique="false"
        upperBound="-1" eType="#//AAA" containment="true" eOpposite="#//AAA/ppp"/>
    <eStructuralFeatures xsi:type="ecore:EAttribute" name="name" ordered="false" lowerBound="1"
        eType="ecore:EDataType http://www.eclipse.org/emf/2002/Ecore#//EString"/>
  </eClassifiers>
</ecore:EPackage>

<?xml version="1.0" encoding="UTF-8"?>
<ecore:EPackage xmi:version="2.0"
    xmlns:xmi="http://www.omg.org/XMI" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xmlns:ecore="http://www.eclipse.org/emf/2002/Ecore" name="Extended"
    nsURI="http:///Extended.ecore" nsPrefix="Extended">
  <eClassifiers xsi:type="ecore:EClass" name="BBB" eSuperTypes="Base.ecore#//AAA"/>
</ecore:EPackage>

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Re: [xtend] bidrectional references not set with two ecore models [message #626001 is a reply to message #625843]

Wed, 22 September 2010 11:21

Christian Dietrich

Messages: 14729
Registered: July 2009

Senior Member

Hello Richard,

i cannot reproduce this using this workflow and extension:

<workflow>

	<bean class="org.eclipse.emf.mwe.utils.StandaloneSetup">
		<registerEcoreFile value="src/metamodel/base.ecore" />
		<registerEcoreFile value="src/metamodel/extended.ecore" />
	</bean>
	
	<component class="org.eclipse.xtend.XtendComponent">
		<metaModel class="org.eclipse.xtend.typesystem.emf.EmfRegistryMetaModel" />
		<invoke value="template::test::getThePPP()" />
		<outputSlot value="model" /> 
	</component>
	
	<component class="org.eclipse.emf.mwe.utils.Writer">
		<uri value="test.xmi" />
		<modelSlot value="model" />
	</component>

</workflow>

import Extended;

Base::PPP getThePPP() :
let bbb = new BBB :
bbb.setPpp(new Base::PPP) ->
bbb.ppp;

~Christian

Twitter : @chrdietrich
Blog : https://www.dietrich-it.de
Day Job: https://www.everest-systems.com

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Re: [xtend] bidrectional references not set with two ecore models [message #626213 is a reply to message #625843]

Wed, 22 September 2010 12:48

Richard Wood

Messages: 29
Registered: January 2010

Junior Member

Thanks a lot Christian

It was the workflow definition. The registering of ecore files did the trick.

I thought it was also possible to achieve the same result with multiple beans.

<bean id="mmExtended" 
	class="org.eclipse.xtend.typesystem.emf.EmfMetaModel">
	<metaModelFile value="Extended.ecore"/>
</bean>
<bean id="mmBase" 
	class="org.eclipse.xtend.typesystem.emf.EmfMetaModel">
	<metaModelFile value="Base.ecore"/>
</bean>

<component class="org.eclipse.xtend.XtendComponent">
	<metaModel idRef="mmExtended"/>
	<metaModel idRef="mmBase"/>
	<invoke value="template::test::getThePPP()" />
	<outputSlot value="model" /> 
</component>

Is there a possible solution with this kind of setup?

[Updated on: Wed, 22 September 2010 12:48]

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