@Override
public ESat isEntailed() {
int env = g.getEnvelopGraph().getActiveNodes().getSize();
int ker = g.getKernelGraph().getActiveNodes().getSize();
if (env < k.getLB() || ker > k.getUB()) {
return ESat.FALSE;
}
if (env == ker) {
return ESat.TRUE;
}
return ESat.UNDEFINED;
}
@Override
public void propagate(int evtmask) throws ContradictionException {
int env = g.getEnvelopGraph().getActiveNodes().getSize();
int ker = g.getKernelGraph().getActiveNodes().getSize();
k.updateLowerBound(ker, aCause);
k.updateUpperBound(env, aCause);
if (ker == env) {
setPassive();
} else if (k.instantiated()) {
int v = k.getValue();
ISet envNodes = g.getEnvelopGraph().getActiveNodes();
if (v == env) {
for (int i = envNodes.getFirstElement(); i >= 0; i = envNodes.getNextElement()) {
g.enforceNode(i, aCause);
}
setPassive();
} else if (v == ker) {
ISet kerNodes = g.getKernelGraph().getActiveNodes();
for (int i = envNodes.getFirstElement(); i >= 0; i = envNodes.getNextElement()) {
if (!kerNodes.contain(i)) {
g.removeNode(i, aCause);
}
}
setPassive();
}
}
}