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UnsupportedOperationException on XExpression compiling [message #996612]

Wed, 02 January 2013 09:22

Eclipse User

I've got these simple rules:

Expression:
	expression=XExpression
;

IfStatement:
	'IF''('condition=Expression')''{'
		statements+=Statement*
	'}'
;

Now, if I try (in my inferrer) to do something like this:

it.newLine.append('''if(«ifStat.condition.expression.toJavaExpression(it)») {''')

it causes following exception:

!STACK 0
java.lang.UnsupportedOperationException
	at org.eclipse.xtext.common.types.impl.JvmIdentifiableElementImpl.getSimpleName(JvmIdentifiableElementImpl.java:68)
	at org.eclipse.xtext.xbase.featurecalls.IdentifiableSimpleNameProvider.getSimpleName(IdentifiableSimpleNameProvider.java:48)
	at org.eclipse.xtext.xbase.compiler.AbstractXbaseCompiler.getFavoriteVariableName(AbstractXbaseCompiler.java:382)
	at org.eclipse.xtext.xbase.compiler.AbstractXbaseCompiler.declareFreshLocalVariable(AbstractXbaseCompiler.java:432)
	at org.eclipse.xtext.xbase.compiler.FeatureCallCompiler._toJavaStatement(FeatureCallCompiler.java:146)
	at org.eclipse.xtext.xbase.compiler.FeatureCallCompiler._toJavaStatement(FeatureCallCompiler.java:158)
	at org.eclipse.xtext.xbase.compiler.FeatureCallCompiler.doInternalToJavaStatement(FeatureCallCompiler.java:111)
	at org.eclipse.xtext.xbase.compiler.XbaseCompiler.doInternalToJavaStatement(XbaseCompiler.java:127)
	at org.eclipse.xtext.xbase.compiler.AbstractXbaseCompiler.internalToJavaStatement(AbstractXbaseCompiler.java:289)
	at org.eclipse.xtext.xbase.compiler.FeatureCallCompiler.prepareExpression(FeatureCallCompiler.java:237)
	at org.eclipse.xtext.xbase.compiler.FeatureCallCompiler._toJavaStatement(FeatureCallCompiler.java:128)
	at org.eclipse.xtext.xbase.compiler.FeatureCallCompiler.doInternalToJavaStatement(FeatureCallCompiler.java:113)
	at org.eclipse.xtext.xbase.compiler.XbaseCompiler.doInternalToJavaStatement(XbaseCompiler.java:127)
	at org.eclipse.xtext.xbase.compiler.AbstractXbaseCompiler.internalToJavaStatement(AbstractXbaseCompiler.java:289)
	at org.eclipse.xtext.xbase.compiler.AbstractXbaseCompiler.toJavaStatement(AbstractXbaseCompiler.java:301)
	at it.rcpvision.ats.suitetest.jvmmodel.LanguageJvmModelInferrer.compileStatement(LanguageJvmModelInferrer.java:190)
	at it.rcpvision.ats.suitetest.jvmmodel.LanguageJvmModelInferrer$1$2$1.apply(LanguageJvmModelInferrer.java:124)
	at it.rcpvision.ats.suitetest.jvmmodel.LanguageJvmModelInferrer$1$2$1.apply(LanguageJvmModelInferrer.java:1)
	at org.eclipse.xtext.xbase.compiler.JvmModelGenerator.generateExecutableBody(JvmModelGenerator.java:784)
	at org.eclipse.xtext.xbase.compiler.JvmModelGenerator._generateMember(JvmModelGenerator.java:574)
	at org.eclipse.xtext.xbase.compiler.JvmModelGenerator.generateMember(JvmModelGenerator.java:1529)
	at org.eclipse.xtext.xbase.compiler.JvmModelGenerator$2.apply(JvmModelGenerator.java:220)
	at org.eclipse.xtext.xbase.compiler.JvmModelGenerator$2.apply(JvmModelGenerator.java:1)
	at org.eclipse.xtext.xbase.lib.IterableExtensions.forEach(IterableExtensions.java:395)
	at org.eclipse.xtext.xbase.compiler.JvmModelGenerator._generateBody(JvmModelGenerator.java:225)
	at org.eclipse.xtext.xbase.compiler.JvmModelGenerator.generateBody(JvmModelGenerator.java:1501)
	at org.eclipse.xtext.xbase.compiler.JvmModelGenerator.generateType(JvmModelGenerator.java:160)
	at org.eclipse.xtext.xbase.compiler.JvmModelGenerator._internalDoGenerate(JvmModelGenerator.java:144)
	at org.eclipse.xtext.xbase.compiler.JvmModelGenerator.internalDoGenerate(JvmModelGenerator.java:1486)
	at org.eclipse.xtext.xbase.compiler.JvmModelGenerator.doGenerate(JvmModelGenerator.java:133)
	at org.eclipse.xtext.builder.BuilderParticipant.handleChangedContents(BuilderParticipant.java:259)
	at org.eclipse.xtext.builder.BuilderParticipant.build(BuilderParticipant.java:194)
	at org.eclipse.xtext.builder.impl.RegistryBuilderParticipant.build(RegistryBuilderParticipant.java:60)
	at org.eclipse.xtext.builder.impl.XtextBuilder.doBuild(XtextBuilder.java:161)
	at org.eclipse.xtext.builder.impl.XtextBuilder.incrementalBuild(XtextBuilder.java:141)
	at org.eclipse.xtext.builder.impl.XtextBuilder.build(XtextBuilder.java:91)
	at org.eclipse.core.internal.events.BuildManager$2.run(BuildManager.java:728)
	at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:42)
	at org.eclipse.core.internal.events.BuildManager.basicBuild(BuildManager.java:199)
	at org.eclipse.core.internal.events.BuildManager.basicBuild(BuildManager.java:239)
	at org.eclipse.core.internal.events.BuildManager$1.run(BuildManager.java:292)
	at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:42)
	at org.eclipse.core.internal.events.BuildManager.basicBuild(BuildManager.java:295)
	at org.eclipse.core.internal.events.BuildManager.basicBuildLoop(BuildManager.java:351)
	at org.eclipse.core.internal.events.BuildManager.build(BuildManager.java:374)
	at org.eclipse.core.internal.events.AutoBuildJob.doBuild(AutoBuildJob.java:143)
	at org.eclipse.core.internal.events.AutoBuildJob.run(AutoBuildJob.java:241)
	at org.eclipse.core.internal.jobs.Worker.run(Worker.java:54)

[Updated on: Wed, 02 January 2013 09:48] by Moderator

Re: UnsupportedOperationException on XExpression compiling [message #996647 is a reply to message #996612]

Wed, 02 January 2013 10:44

Eclipse User

I've found the reason of Exception, but I can't solve it:
when there is a variable in my XExpression it wants to get simple name of that variable

public String getSimpleName(JvmIdentifiableElement element) {
		if (element == null || element.eIsProxy()) {
			return null;
		}
		if (element instanceof JvmFeature) {
			return ((JvmFeature) element).getSimpleName();
		}
		if (element instanceof JvmFormalParameter) {
			return ((JvmFormalParameter) element).getName();
		}
		if (element instanceof XVariableDeclaration) {
			return ((XVariableDeclaration) element).getName();
		}
		if (element instanceof XSwitchExpression) {
			final XSwitchExpression xSwitchExpression = (XSwitchExpression) element;
			String varName = xSwitchExpression.getLocalVarName();
			if (varName!=null)
				return varName;
			XExpression expression = xSwitchExpression.getSwitch();
			if (expression instanceof XFeatureCall) {
				return getSimpleName(((XFeatureCall) expression).getFeature());
			} else {
				return null;
			}
		}
		return element.getSimpleName();
	}

note: return element.getSimpleName();
but my variable has no simple name:

Variable returns jvmTypes::JvmIdentifiableElement:
	{Variable}type=JvmTypeReference simpleName=ID ';'
;

[Updated on: Wed, 02 January 2013 10:45] by Moderator

Re: UnsupportedOperationException on XExpression compiling [message #996652 is a reply to message #996647]

Wed, 02 January 2013 10:59

Eclipse User

If you introduce your own expressions (which extends an Xbase class) you
have to provide your own implementation for what Xbase expects, in this
case, you must override getSimpleName and provide a case for your
Variable (and delegate to super in all other cases).

cheers
Lorenzo

On 01/02/2013 04:44 PM, Tommaso De Sica wrote:
> I've found the reason of Exception, but I can't solve it:
> when there is a variable in my XExpression it wants to get simple name
> of that variable
> public String getSimpleName(JvmIdentifiableElement element) {
> if (element == null || element.eIsProxy()) {
> return null;
> }
> if (element instanceof JvmFeature) {
> return ((JvmFeature) element).getSimpleName();
> }
> if (element instanceof JvmFormalParameter) {
> return ((JvmFormalParameter) element).getName();
> }
> if (element instanceof XVariableDeclaration) {
> return ((XVariableDeclaration) element).getName();
> }
> if (element instanceof XSwitchExpression) {
> final XSwitchExpression xSwitchExpression =
> (XSwitchExpression) element;
> String varName = xSwitchExpression.getLocalVarName();
> if (varName!=null)
> return varName;
> XExpression expression = xSwitchExpression.getSwitch();
> if (expression instanceof XFeatureCall) {
> return getSimpleName(((XFeatureCall)
> expression).getFeature());
> } else {
> return null;
> }
> }
> return element.getSimpleName();
> }
>
> but my variable has no simple name:
> Variable returns jvmTypes::JvmIdentifiableElement:
> {Variable}type=JvmTypeReference simpleName=ID ';'
> ;

--
Lorenzo Bettini, PhD in Computer Science, DI, Univ. Torino
ICQ# lbetto, 16080134 (GNU/Linux User # 158233)
HOME: http://www.lorenzobettini.it MUSIC: http://www.purplesucker.com
http://www.myspace.com/supertrouperabba
BLOGS: http://tronprog.blogspot.com http://longlivemusic.blogspot.com
http://www.gnu.org/software/src-highlite
http://www.gnu.org/software/gengetopt
http://www.gnu.org/software/gengen http://doublecpp.sourceforge.net

Re: UnsupportedOperationException on XExpression compiling [message #996657 is a reply to message #996647]

Wed, 02 January 2013 11:16

Eclipse User

It works, thank you!

[Updated on: Wed, 02 January 2013 11:46] by Moderator

Re: UnsupportedOperationException on XExpression compiling [message #996714 is a reply to message #996657]

Wed, 02 January 2013 13:34

Eclipse User

On 01/02/2013 05:16 PM, Tommaso De Sica wrote:
> I've added method getSimpleName() in VariableImpl.java, but I think this
> isn't the best solution beacuse it was a generated class.

you must provide your implementation of

public String getSimpleName(JvmIdentifiableElement element)

in a subclass of the class you refer to in your original post

--
Lorenzo Bettini, PhD in Computer Science, DI, Univ. Torino
ICQ# lbetto, 16080134 (GNU/Linux User # 158233)
HOME: http://www.lorenzobettini.it MUSIC: http://www.purplesucker.com
http://www.myspace.com/supertrouperabba
BLOGS: http://tronprog.blogspot.com http://longlivemusic.blogspot.com
http://www.gnu.org/software/src-highlite
http://www.gnu.org/software/gengetopt
http://www.gnu.org/software/gengen http://doublecpp.sourceforge.net

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