Xtext: Use EClass in XExpression - xtext

Question

I am writing on a Xtext grammar that uses XExpressions and also operates on Eclasses. Now I want to also be able to access Eclasses from the XExpression, for example I write an expression like this:
Eclass1.attribute1 = Eclass2.attribute1
I would like to know, how I can use the Eclass from within the XExpression?
Grammar
grammar org.xtext.example.mydsl.Mydsl with
org.eclipse.xtext.xbase.Xbase
import "http://www.eclipse.org/emf/2002/Ecore" as ecore
generate mydsl "http://www.xtext.org/example/mydsl/Mydsl"
Model:
(operations += Operation)*;
terminal ATTR : ID ('.' ID)+;
Operation:
'operation' left=[ecore::EClass|ATTR] 'and' right=
[ecore::EClass|ATTR] 'defined' 'as' condition=XExpression
;
Inferrer/ Infer method
def dispatch void infer(Model element, IJvmDeclaredTypeAcceptor acceptor, boolean isPreIndexingPhase) {
acceptor.accept(element.toClass("example.mydsl")) [
for (operation : element.operations) {
left = operation.left
right = operation.right
if (left.eIsProxy()) {
left = EcoreUtil.resolve(left, operation) as EClass
}
if (right.eIsProxy()) {
right = EcoreUtil.resolve(right, operation) as EClass
}
//field for right class left out, but works the same
members += left.toField(left.name,typeRef(left.EPackage.name+"."+left.name))
members += operation.toMethod("conditionExpr",
typeRef(Void.TYPE)) [
body = operation.condition
]
}
]
}
RuntimeModule
class MyDslRuntimeModule extends AbstractMyDslRuntimeModule {
def Class<? extends ImplicitlyImportedFeatures> bindImplicitlyImportedTypes() {
return MyImportFeature
}
}
MyImportFeature
class MyImportFeature extends ImplicitlyImportedFeatures{
override protected getStaticImportClasses() {
(super.getStaticImportClasses() + #[PackageFromWorkSpace]).toList
}
}

Answer 1

I Am not sure if i get your question.
Ususally EMF generates constants for EAttributes so if you want to access the attributes themselfs
so you could either do
MyDslPackage.Literals.GREETING__NAME
or
MyDslPackage.eINSTANCE.getGreeting_Name()
can you give some more hints on what you actually want to do
update: here is a snippet on how to get a java class from a reference to an eclass
Thingy:{
val EClass eclazz = f.clazz
val uri = EcorePlugin.getEPackageNsURIToGenModelLocationMap(true).get(eclazz.EPackage.nsURI)
val rs = new ResourceSetImpl
val r = rs.getResource(uri, true)
r.load(null)
val p = r.contents.head
if (p instanceof GenModel) {
val genClass = p.findGenClassifier(eclazz)
if (genClass instanceof GenClass) {
println(genClass.qualifiedInterfaceName)
members+=f.toField(eclazz.name, genClass.qualifiedInterfaceName.typeRef)
}
}
}