How to expand field initializers in xtend annotation processor

Question

I am using Active Annotations to generate fields in my classes and am having difficulty discovering how to expand field initializer expressions. Without initializers the code looks like this

class JavaFxPropertyProcessor implements TransformationParticipant<MutableFieldDeclaration>{

def private transform(MutableFieldDeclaration field, extension TransformationContext context){
    fields.forEach[transform(context)]
}

def private transform(MutableFieldDeclaration field, extension TransformationContext context){

    val clazz = field.declaringType as MutableClassDeclaration
    val theClass = SomeJavaClass //any non-parameterised java class here

    clazz.addField("myField")[
        type = theClass.newTypeReference
        initializer = ['''new <<toJavaCode(theClass.newTypeReference()>>(this)''']
    ]       
  }
}

This works fine when the field has no initializer. Ocassionally, I would like the field to have an initializer and that works fine for int and bool literals by just dumping the initializer as a string into the expression

val theInitializer = field.initializer //this is not null
    clazz.addField("myField2")[
        type = theClass.newTypeReference
        initializer = [
        '''new <<toJavaCode(theClass.newTypeReference()>>(this, <<theInitializer.toString>>)'''
        ]
    ]

When the initializer is a list literal, say #[1,2,3] for example, then clearly the naive initializer.toString technique doesn't work since it creates java code such as

val myField = new List<Integer>(#[1,2,3]);

So how to I get to evaluate/expand the field.initializer (which is of type org.eclipse.xtend.lib.macro.expression) in order to java-ise it for my initializers?

How to expand field initializers in xtend annotation processor

0 Answers0