protected E2 getChildOf(E1 parent) {
Collection<? extends RefObject> c = super.query(true, parent);
assert (c.size() <= 1);
if (c.isEmpty()) {
return null;
} else {
return end2GenericClass.cast(c.iterator().next());
}
}
protected E1 getParentOf(E2 child) {
Collection<? extends RefObject> c = super.query(false, child);
assert (c.size() <= 1);
if (c.isEmpty()) {
return null;
} else {
return end1GenericClass.cast(c.iterator().next());
}
}