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[henshin-user] Error processing attribute update
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Hi all,
I haven't used Henshin much before, so this may well be a simple
beginner's error. Unfortunately, the error message I am provided with
isn't awfully helpful and I couldn't figure out what's going on.
I have created a simple transformation using the Henshin diagram editor.
This moves one object from one place to another and updates some
attributes. To express attribute updates, I have used the -> notation as
shown in the Bank tutorial. So, one of the attributes reads
"spaceRemaining=x->x+a.spaceRequired*a.quantity" where "a" refers to a
different node in my rule, which has the attributes mentioned.
When I run this rule on a model, it is matched (as I would expect), but
I get the following error:
java.lang.RuntimeException: ReferenceError: "x" is not defined in
<eval> at line number 1
at
org.eclipse.emf.henshin.interpreter.impl.EngineImpl.evalAttributeExpression(EngineImpl.java:946)
at
org.eclipse.emf.henshin.interpreter.info.VariableInfo.createConstraints(VariableInfo.java:189)
at
org.eclipse.emf.henshin.interpreter.info.VariableInfo.createVariables(VariableInfo.java:111)
at
org.eclipse.emf.henshin.interpreter.info.VariableInfo.<init>(VariableInfo.java:77)
at
org.eclipse.emf.henshin.interpreter.info.RuleInfo.<init>(RuleInfo.java:26)
at
org.eclipse.emf.henshin.interpreter.impl.EngineImpl.getRuleInfo(EngineImpl.java:748)
at
org.eclipse.emf.henshin.interpreter.impl.EngineImpl$MatchFinder.<init>(EngineImpl.java:323)
at
org.eclipse.emf.henshin.interpreter.impl.EngineImpl$MatchGenerator.iterator(EngineImpl.java:268)
at
org.eclipse.emf.henshin.interpreter.impl.RuleApplicationImpl.execute(RuleApplicationImpl.java:89)
at
org.eclipse.emf.henshin.interpreter.impl.UnitApplicationImpl.executeRule(UnitApplicationImpl.java:175)
at
org.eclipse.emf.henshin.interpreter.impl.UnitApplicationImpl.doExecute(UnitApplicationImpl.java:99)
at
org.eclipse.emf.henshin.interpreter.impl.UnitApplicationImpl.execute(UnitApplicationImpl.java:89)
...
Shouldn't this variable be made available by Henshin and be made to
contain the old attribute value?
What's going on here?
Many thanks,
Steffen
--
Dr. rer. nat. Steffen Zschaler AHEA
Senior Lecturer
King's College London
Department of Informatics
Email szschaler@xxxxxxx
Phone +44 (020) 7848 1513
WWW http://www.steffen-zschaler.de/
