Xtext: JvmModelInferrer initialize field - eclipse

Question

I'd like to generate a List field into my class generated from my DSL and initialize it like this:
private List<MyObject> myObjects= Lists.newArrayList();
The only way I know for this, is to append some text to the initializer:
members += appRule.toField("myObjects", appRule.newTypeRef(List, it.newTypeRef(MyObject))) [
initializer = [append('''Lists.newArrayList()''')]
]
However, using this approach the JvmModelInferrer won't import the Guava Strings library, thus will raise compilation issues. Is there any way to overcome this obstacle?

Answer 1

If I understand your issue (as you are referring to the Guava Strings library that is not used in the code :) ), your problem is, that the class reference Lists is not imported.
For such constructs, we have a helper method in EMF-IncQuery that serializes a type reference the same way parameters are serialized. This functionality relies on the injectable TypeReferenceSerializer class.
def referClass(ITreeAppendable appendable, EObject ctx, Class<?> clazz, JvmTypeReference... typeArgs) {
val ref = ctx.newTypeRef(clazz, typeArgs)
if (ref != null) {
appendable.serialize(ref, ctx)
} else {
//Class resolution error - error handling required here
//A fallback to writing out the fqn of the class
appendable.append(clazz.canonicalName)
}
}
def serialize(ITreeAppendable appendable, JvmTypeReference ref, EObject ctx) {
typeReferenceSerializer.serialize(ref, ctx, appendable)
}