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[Xtext 2.1] Implementing a custom post build step [message #758773]

Thu, 24 November 2011 14:09

Cedric Moonen

Messages: 274
Registered: August 2009

Senior Member

In my build process, I need to have a many to one code generation: several Xtext resources will lead to the generation of one single file (in fact, this file will contain a list of IDs).
I don't want to implement this many to one generation in my IGenerator implementation since it will be invoked multiple times if several resources are saved at the same time. Furthermore, in a headless build, it will be invoked for each resource which is not really efficient.

I was thinking of creating my own IXtextBuilderParticipant but there's quite some code already in the existing BuilderParticipant which I don't want to duplicate in my own builder. Furthermore, I can't really extend BuilderParticipant since all the member variables were declared private.

What would be the appropriate way to implement something like that ?

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Re: [Xtext 2.1] Implementing a custom post build step [message #758947 is a reply to message #758773]

Fri, 25 November 2011 11:28

Klaus Birken

Messages: 4
Registered: November 2011

Junior Member

There is a blogpost by Karsten Thoms on generating from multiple input models: kthoms.wordpress.com/2011/07/12/xtend-generating-from-multiple-input-models

However, I just tried to implement an IGenerator which has to generate some textual file from the Resource and do some postprocessing afterwards, i.e., calling some external tool on the generated textfile and create a binary file in the same directory. Starting e.g. in xtend we have

class MyGenerator implements IGenerator {
   override void doGenerate (Resource resource, IFileSystemAccess fsa) {
      // fsa doesn't provide access to the target directory.. how do we find the target directory?
      // ...
   }
}

How can this be done? The doGenerate() function is called by the framework, how can I hook in there?

Regards,
Klaus

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Re: [Xtext 2.1] Implementing a custom post build step [message #758957 is a reply to message #758947]

Fri, 25 November 2011 11:48

Christian Dietrich

Messages: 14665
Registered: July 2009

Senior Member

Hi,

you could try to downcast IFileSystemAccess to a impl like EclipseResourceFileSystemAccess2 or JavaIoFileSystemAccess
and search the information there (getFile/getFolder) or bind a complete own IFileSystemAccess
that allows you to retrieve that information.

there are already some bugs arround this to make the information more "accessable"

~Christian

Twitter : @chrdietrich
Blog : https://www.dietrich-it.de

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