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XPand2 / MWE: Load file for XPand generator from outside the Java classpath? [message #898051]

Wed, 25 July 2012 12:54

Eclipse User

Hello everyone,

I'm using MWE to run a XPand2 generator. I had a look at the documentation of the generator and it states that the file containing the XPand template (the .xpt file) has to be located on the Java classpath. Since I am developing a plugin for MagicDraw, I have little influence on the classpath (besides from adding Jar files) and can't just "add" the .xpt file to the classpath. Adding it to the plugin Jar file unfortunately did not help either, the workflow engine is just unable to locate the file.

However, what I do know is the absolute filepath of the .xpt file - can I somehow tell the generator to use the .xpt file from the filepath instead of looking it up on the classpath?

Thanks,

Alan

Re: XPand2 / MWE: Load file for XPand generator from outside the Java classpath? [message #898595 is a reply to message #898051]

Thu, 26 July 2012 14:49

Eclipse User

Xpand is using an instance of org.eclipse.xtend.expression.ResourceManager to locate resources (i.e. Xpand/Xtend templates) by qualified name. By default AbstractExpressionUsingWorkflowComponent#getResourceManager (Xpand's Generator component derives from it) instantiates an instance of org.eclipse.xtend.expression.ResourceManagerDefaultImpl, which loads resources by accessing ResourceLoaderFactory#createResourceLoader(). The implementation of ResourceLoader to instantiate can be passed as System property "org.eclipse.emf.mwe.core.resources.ResourceLoader", or derive ResourceManagerDefaultImpl and set it to the Generator component.

Kind regards,
~Karsten

Re: XPand2 / MWE: Load file for XPand generator from outside the Java classpath? [message #898612 is a reply to message #898595]

Thu, 26 July 2012 17:24

Eclipse User

Hello,

thank you for your response. So, what you are basically suggesting is to subclass the ResourceManagerDefaultImpl() and override the lookup/load method (did I get that right?). That's actually a nice idea. Right now, I have some advice from the MagicDraw forums which may enable me to get the .xpt file on the classpath after all, but if that is not applicable, I will definitly try your approach as it sounds very promising.

I really whish that there was more in-depth documentation on XPand and MWE on the web, though. That could avoid having to ask such questions. Just as a side note Wink

Thank you very much for your help,

Alan

Re: XPand2 / MWE: Load file for XPand generator from outside the Java classpath? [message #899012 is a reply to message #898051]

Mon, 30 July 2012 03:33

Eclipse User

Hi Alan,

it is not that common use case to change the resource loading. This is one of the reasons why you don't see it in the documentation. There could always be more docs, but someone has to write it Wink

Kind regards,
~Karsten

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