Add/implement JVar.annotate(JAnnotationUse annotation)

[dmak]

Dear community,

To allow 3rd party JAXB plugins to modify the model in a proper way, I would like to ask you to implement JVar.annotate(JAnnotationUse annotation) method:

public void annotate(JAnnotationUse annotation) {
    if (annotations == null)
        annotations = new ArrayList<>();

    annotations.add(annotation);
}

Also check isAnnotated() method which is not correctly implemented: the annotation could be added and then removed hence annotations collection may be empty, so correct implementation could be:

protected boolean isAnnotated() {
    return CollectionUtils.isNotEmpty(annotations);
}

P.S. The method is supposed to be used in jaxb-xew-plugin project.