- public Iterator<Result> iterator() { return results.iterator(); }
- public Parser.Table.State state() { return state; }
-
- public int toInt() { return idx; }
+ public GSS.Phase predecessorPhase() { return predecessorPhase; }
+ protected boolean destroyed = false;
+ private int numNonDoomedSuccessors = 0;
+ public boolean hasSuccessors() { return successors.size() > 0; }
+ public boolean hasNonDoomedSuccessors() { return numNonDoomedSuccessors > 0; }
+
+ /** only to be invoked (or overridden as public) by the subclass */
+ protected void addPred(OtherNode pred) {
+ if (predecessors.contains(pred)) throw new Error("a predecessor was added twice");
+ if (pred.phase() != predecessorPhase()) throw new Error();
+ predecessors.add(pred);
+ pred.addSucc(this);
+ }
+ public void addSucc(OtherNode succ) {
+ if (successors.contains(succ)) throw new Error("a predecessor was added twice");
+ successors.add(succ);
+ numNonDoomedSuccessors += succ.isDoomedState() ? 0 : 1;
+ if (predecessors.size() > 1 && (((Object)this) instanceof ResultNode)) throw new Error();
+ }
+ public void removeSucc(OtherNode succ) {
+ if (!successors.contains(succ)) return;
+ successors.remove(succ);
+ numNonDoomedSuccessors -= succ.isDoomedState() ? 0 : 1;
+ check();
+ }