@Override
public ESat isEntailed() {
boolean possibleTrue =
PropUtil.isKerSubsetEnv(result, consequent) && PropUtil.isKerSubsetEnv(consequent, result);
boolean possibleFalse =
PropUtil.isKerSubsetEnv(result, alternative)
&& PropUtil.isKerSubsetEnv(alternative, result);
if (!possibleTrue && !possibleFalse) {
return ESat.FALSE;
}
if (antecedent.isInstantiated()) {
if (antecedent.getValue() == 1) {
if (!possibleTrue) {
return ESat.FALSE;
}
return result.isInstantiated() && consequent.isInstantiated() ? ESat.TRUE : ESat.UNDEFINED;
} else {
if (!possibleFalse) {
return ESat.FALSE;
}
return result.isInstantiated() && alternative.isInstantiated() ? ESat.TRUE : ESat.UNDEFINED;
}
}
if (possibleTrue
&& possibleFalse
&& result.isInstantiated()
&& consequent.isInstantiated()
&& alternative.isInstantiated()) {
return ESat.TRUE;
}
return ESat.UNDEFINED;
}
@Override
public void propagate(int evtmask) throws ContradictionException {
if (!antecedent.isInstantiated()) {
if (!PropUtil.isKerSubsetEnv(result, consequent)
|| !PropUtil.isKerSubsetEnv(consequent, result)) {
antecedent.instantiateTo(0, this);
} else if (!PropUtil.isKerSubsetEnv(result, alternative)
|| !PropUtil.isKerSubsetEnv(alternative, result)) {
antecedent.instantiateTo(1, this);
} else {
ISetIterator iter = result.getUB().iterator();
while (iter.hasNext()) {
int i = iter.nextInt();
if (!consequent.getUB().contains(i) && !alternative.getUB().contains(i)) {
result.remove(i, this);
} else if (consequent.getLB().contains(i) && alternative.getLB().contains(i)) {
result.force(i, this);
}
}
}
}
if (antecedent.isInstantiated()) {
if (antecedent.getValue() == 1) {
PropUtil.envSubsetEnv(result, consequent, this);
PropUtil.envSubsetEnv(consequent, result, this);
PropUtil.kerSubsetKer(result, consequent, this);
PropUtil.kerSubsetKer(consequent, result, this);
} else {
PropUtil.envSubsetEnv(result, alternative, this);
PropUtil.envSubsetEnv(alternative, result, this);
PropUtil.kerSubsetKer(result, alternative, this);
PropUtil.kerSubsetKer(alternative, result, this);
}
}
}