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[Xtend2] Generating output file from several model files [message #731696]

Sun, 02 October 2011 14:47

Tobias Kniep

Messages: 13
Registered: June 2010

Junior Member

Hello,

I'm currently migrating an existing Xtend/Xpand code generator to Xtend2. For some output files the current generator collects information from model elements spread over a lot of model files. This is done by calling the generator (org.eclipse.xpand2.Generator) from the MWE2 workflow with a statement like that:

expand = "main FOR model"

This gives the main template a list of all resources which can then be searched for the required model elements.

Now, with Xtend2 the doGenerate() function is called for each Resource independently. I understand that I can navigate to other Resources by first getting the ResourceSet and then all contained Resources. But how can I make sure that this is not repeated for each Resource over and over again? Assume, I have two model files A.dsl and B.dsl and just a single output file target.c that requires elements from both A.dsl and B.dsl. The doGenerate() function will be called for both model files but during the first call (for A.dsl) I'll already collect all required information and generate target.c. So when doGenerate() is called the second time, how can I make it recognize that it's not necessary to generate target.c again?

One possible solution I could think of would be to write an own GeneratorComponent which passes all resources from a slot to the Xtend2 class in one function call.
Is there any other/better solution to this?

Tobias

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