void updateCats() {
if (v == null) return;
int cc = v.getNumCats();
if (cc == cats) return;
if (cc == 0 || seqToCat == null || catToSeq == null) {
seqToCat = catToSeq = null;
cats = cc;
return;
}
/* what do we do if a sequence already existed and the number of categories changed?
currenty we simply discard any order - but that could be changed ... */
seqToCat = catToSeq = null;
cats = cc;
}
public SCatSequence(SVarInterface var, Object theOwner, boolean notifyVariable) {
v = var;
owner = theOwner;
cats = (v != null) ? v.getNumCats() : 0;
notifyVar = notifyVariable;
}