// maintain the list by checking only the variable that has changed when
// * checking if a tuple is valid.
// *
// * @param idx : the variable changed
public void maintainList(/*int idx*/ ) {
int cidx = 0;
int nLast = last.get();
while (cidx <= nLast) {
int idxt = listuples[cidx++];
int[] tuple = relation.getTuple(idxt);
if (valcheck.isValid(tuple /*,idx*/)) {
// extract the supports
for (int i = futureVars.nextSetBit(0); i > -1; i = futureVars.nextSetBit(i + 1)) {
if (!gacValues[i].get(tuple[i] - offsets[i])) {
gacValues[i].set(tuple[i] - offsets[i]);
nbGacValues[i]++;
if (nbGacValues[i] == vars[i].getDomainSize()) {
futureVars.clear(i);
}
}
}
} else {
// remove the tuple from the current list
cidx--;
final int temp = listuples[nLast];
listuples[nLast] = listuples[cidx];
listuples[cidx] = temp;
last.add(-1);
nLast--;
}
}
}
/**
* Main propagation loop. It maintains the list of valid tuples through the search
*
* @throws ContradictionException
*/
public void gacstr() throws ContradictionException {
initializeData();
maintainList();
pruningPhase();
if (getCartesianProduct() <= last.get() + 1) {
setPassive();
}
}
private void filter() throws ContradictionException {
int lb = nbSure.get();
int ub = poss.size() + lb;
vars[nb_vars].updateBounds(lb, ub, this);
if (vars[nb_vars].isInstantiated() && lb < ub) {
if (vars[nb_vars].getValue() == lb) {
backPropRemPoss();
} else if (vars[nb_vars].getValue() == ub) {
backPropForcePoss();
}
}
}
@Override
public void propagate(int vidx, int evtmask) throws ContradictionException {
if (vidx != nb_vars && poss.contains(vidx)) {
IntVar var = vars[vidx];
int nb = 0;
for (int j : values) {
if (var.contains(j)) {
nb++;
}
}
if (nb == var.getDomainSize()) {
nbSure.add(1);
poss.remove(vidx);
vars[nb_vars].updateLowerBound(nbSure.get(), this);
} else if (nb == 0) {
poss.remove(vidx);
vars[nb_vars].updateUpperBound(poss.size() + nbSure.get(), this);
}
}
forcePropagate(PropagatorEventType.CUSTOM_PROPAGATION);
}
@Override
public void propagate(int v, int mask) throws ContradictionException {
if (vars[v].getEnvelopeSize() == 0) {
if (emptySetIndex.get() != -1) {
contradiction(vars[v], "");
} else {
emptySetIndex.set(v);
for (int i = 0; i < vars.length; i++) {
int s = vars[i].getEnvelopeSize();
if (i != v && s != vars[i].getKernelSize()) {
if (s == 0) {
contradiction(vars[i], "");
} else if (s == 1) {
vars[i].addToKernel(vars[i].getEnvelopeFirst(), this);
}
}
}
}
}
if (vars[v].getEnvelopeSize() == 1 && emptySetIndex.get() != -1) {
vars[v].addToKernel(vars[v].getEnvelopeFirst(), this);
}
}