问题
I am building a code generator in XTend where I already have an input model and meta model. That is, I use ATL to generate the input model for my XTend code generator (as part of a transformation sequence to gradually lower the abstraction level, instead of at once; this is the reason i'm not using xtext to create the syntax).
So to be very clear, my input model for the code generator is a file in XMI format and NOT in the grammar of the xtext project (not even using that)! And i think this is causing me problems/confusion.
I created a new XText project using Existing models, right clicked on the .text file, run as , generate artefacts, and then i did the same for the mwe2 file.
What is the next step, am I doing it right? How can I start my code generator? All the examples are from the POV that you use XText to create a DSL. I have an EMF meta model, and an XMI based instance of that. How to process that further using XTend?
Any hint or pointer to a tutorial is helpful.
Solution:
The solution was as Sven suggested in my accepted answer, but also I would like to note that you need to use a genmodel to generate Java artifacts from your meta model. This link shows how: http://www.vogella.com/articles/EclipseEMF/article.html , see section 4. This may appear all too logical, but i think it's worth noting anyway.
回答1:
If you have an XMI and just want to generate code from it, you don't need Xtext at all. Just start with a Java project (I'd use a plug-in project, to reuse the dependency management) and start coding:
import org.eclipse.emf.common.util.URI
import org.eclipse.emf.ecore.EPackage
import org.eclipse.emf.ecore.resource.Resource$Factory$Registry
import org.eclipse.emf.ecore.resource.impl.ResourceSetImpl
import org.eclipse.emf.ecore.xmi.impl.XMIResourceFactoryImpl
class MyCodeGenerator {
def static void main(String[] args) {
new MyCodeGenerator().generate("mymodel.xmi")
}
def generate(String file) {
doEMFSetup
val resourceSet = new ResourceSetImpl
val resource = resourceSet.getResource(URI.createURI(file), true)
for (content : resource.contents) {
generateCode(content)
}
}
def dispatch generateCode(MySpecialType it) '''
public class «name» {
«FOR member : members»
«ENDFOR»
}
'''
def dispatch generateCode(MyMember it) '''
private «type» «name»;
...
'''
def doEMFSetup() {
// EPackage$Registry.INSTANCE.put(MyPackage.eINSTANCE.nsURI, MyPackage.eINSTANCE)
Resource$Factory.Registry.INSTANCE.extensionToFactoryMap.put("xmi", new XMIResourceFactoryImpl);
}
}
The dependencies you need to add to your Manifest :
Require-Bundle: org.eclipse.xtend.lib,
com.google.guava,
org.eclipse.xtext.xbase.lib,
org.eclipse.emf.common,
org.eclipse.emf.ecore,
org.eclipse.emf.ecore.xmi
来源:https://stackoverflow.com/questions/12458852/load-emf-model-instance-in-xtend