private void addRelatedClasses(ClassDoc type) {
// Generalization
ClassDoc superType = type.superclass();
if (superType != null &&
!superType.qualifiedName().equals("java.lang.Object") &&
!superType.qualifiedName().equals("java.lang.Annotation") &&
!superType.qualifiedName().equals("java.lang.Enum")) {
addNode(superType, false);
addEdge(new Edge(GENERALIZATION, type, superType));
}