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Inferred enum issue [message #1097874]

Fri, 30 August 2013 05:18

Eclipse User

Hi when I use this code to infer a java enumeration

 	acceptor.accept(element.toEnumerationType(qualifiedName,null)).initializeLater [
     		println("ENUM "+element.fullyQualifiedName);
      		documentation = element.documentation
      		
      		for (ec : element.enumBody.constant) {
 				literals +=	ec.toEnumerationLiteral(ec.name)
      		}
      		members += literals
  	]

I get this error :

!ENTRY org.eclipse.core.jobs 4 2 2013-08-30 11:13:24.571
!MESSAGE An internal error occurred during: "calculating highlighting".
!STACK 0
java.lang.UnsupportedOperationException
	at org.eclipse.emf.common.util.DelegatingEList$UnmodifiableEList.add(DelegatingEList.java:855)
	at org.eclipse.xtext.xbase.jvmmodel.JvmTypesBuilder.operator_add(JvmTypesBuilder.java:145)
	at com.ibm.jrules.xtext.iros.jvmmodel.IROSJvmModelInferrer$1.apply(IROSJvmModelInferrer.java:154)
	at com.ibm.jrules.xtext.iros.jvmmodel.IROSJvmModelInferrer$1.apply(IROSJvmModelInferrer.java:1)
	at org.eclipse.xtext.xbase.jvmmodel.JvmModelAssociator.installDerivedState(JvmModelAssociator.java:296)
	at org.eclipse.xtext.resource.DerivedStateAwareResource.installDerivedState(DerivedStateAwareResource.java:145)
	at org.eclipse.xtext.xbase.resource.BatchLinkableResource.getContents(BatchLinkableResource.java:124)
	at org.eclipse.emf.ecore.resource.impl.ResourceImpl$4.getChildren(ResourceImpl.java:519)
	at org.eclipse.emf.common.util.AbstractTreeIterator.hasAnyChildren(AbstractTreeIterator.java:97)
	at org.eclipse.emf.common.util.AbstractTreeIterator.hasNext(AbstractTreeIterator.java:85)
	at org.eclipse.xtext.xbase.ui.highlighting.XbaseHighlightingCalculator.searchAndHighlightElements(XbaseHighlightingCalculator.java:126)
	at org.eclipse.xtext.xbase.ui.highlighting.XbaseHighlightingCalculator.doProvideHighlightingFor(XbaseHighlightingCalculator.java:121)
	at org.eclipse.xtext.xbase.ui.highlighting.XbaseHighlightingCalculator.provideHighlightingFor(XbaseHighlightingCalculator.java:98)
	at org.eclipse.xtext.ui.editor.syntaxcoloring.MergingHighlightedPositionAcceptor.provideHighlightingFor(MergingHighlightedPositionAcceptor.java:51)
	at org.eclipse.xtext.ui.editor.syntaxcoloring.HighlightingReconciler.reconcilePositions(HighlightingReconciler.java:92)
	at org.eclipse.xtext.ui.editor.syntaxcoloring.HighlightingReconciler.modelChanged(HighlightingReconciler.java:292)
	at org.eclipse.xtext.ui.editor.syntaxcoloring.HighlightingReconciler$1$1.process(HighlightingReconciler.java:259)
	at org.eclipse.xtext.ui.editor.syntaxcoloring.HighlightingReconciler$1$1.process(HighlightingReconciler.java:1)
	at org.eclipse.xtext.util.concurrent.IUnitOfWork$Void.exec(IUnitOfWork.java:36)
	at org.eclipse.xtext.util.concurrent.AbstractReadWriteAcces.readOnly(AbstractReadWriteAcces.java:32)
	at org.eclipse.xtext.ui.editor.model.XtextDocument$XtextDocumentLocker.readOnly(XtextDocument.java:218)
	at org.eclipse.xtext.ui.editor.model.XtextDocument.readOnly(XtextDocument.java:79)
	at org.eclipse.xtext.ui.editor.syntaxcoloring.HighlightingReconciler$1.run(HighlightingReconciler.java:256)
	at org.eclipse.core.internal.jobs.Worker.run(Worker.java:53)

I use an ArrayList of JvmEnumerationLiteral instead of literals as shown below everything works fine and the java corresponding file of the enumeration id generated : do I incorrectly use literals ?

 	acceptor.accept(element.toEnumerationType(qualifiedName,null)).initializeLater [
     		println("ENUM "+element.fullyQualifiedName);
      		documentation = element.documentation
      		var test = new ArrayList<JvmEnumerationLiteral>
      		for (ec : element.enumBody.constant) {
 				test +=	ec.toEnumerationLiteral(ec.name)
      		}
      		members += test
  	]

Re: Inferred enum issue [message #1098014 is a reply to message #1097874]

Fri, 30 August 2013 09:25

Eclipse User

Adding the literals to members looks odd as they are both lists in the JvmDeclaredType so I'd expect only one or other should be used.

It works if you only add them to members instead of literals.

for (ec : element.enumBody.constant) {
      members += ec.toEnumerationLiteral(ec.name)
}

From the error it appears literals is read-only in this context.

Re: Inferred enum issue [message #1098166 is a reply to message #1098014]

Fri, 30 August 2013 14:16

Eclipse User

Thank you Ian very good point ! Do you have an idea why we have literals as they are read only ? We really lack documentation on inferring it is sometimes a real pain !

Re: Inferred enum issue [message #1098311 is a reply to message #1098166]

Fri, 30 August 2013 19:24

Eclipse User

No idea. A guess is literals is a filtered view of members rather than its own list.
You can have members in enums which aren't literals (for example methods) so literals may be a useful subset.

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