| [Xpand/MWE] Scoping of global variables and element properties [message #1219705] |
Thu, 05 December 2013 13:41 |
 Peter Keller
Messages: 14
Registered: October 2009 |
Junior Member |
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Dear all,
I am biting the bullet and trying to migrate a transformation/generation project from Indigo to Kepler. I have a workflow that first transforms a model like this:
<component class="org.eclipse.xtend.XtendComponent">
....
<invoke value="uml2xsd::root( ${modelSlot} )"/>
<outputSlot value="xmlSchema"/>
</component>
I then run some Xpand generators that use both the original model and the generated one, like this:
<component class="org.eclipse.xpand2.Generator">
.....
<globalVarDef name="schemaDocs" value="xmlSchema"/>
<expand value="pythonHelper::pythonGenerator('${srcGen}') FOR ${modelSlot}"/>
...
</component>
In the first transformation, I use storeGlobalVar and setProperty from org::eclipse::xtend::util::stdlib::globalvar and org::eclipse::xtend::util::stdlib::elementprops respectively, and access the values from the subsequent Xpand components. Under Indigo this works fine, but I find that with Kepler the values are lost and getGlobalVar and getProperty just return nulls. Is this change of behaviour intentional, or do I need to do something specific to enable these variables and properties to persist between workflow components?
In my case I can work around the loss of the global variable trivially, but losing the element properties is a real nuisance. The versions that I am using are:
Indigo: MWE, Xpand and Xtend versions 1.2.1
Kepler: MWE version 1.3.1 (installed from the "EMFT MWE-2.4.1" package; Xpand and Xtend versions 1.4.0
Thanks for any hints,
Peter.
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