private void checkForPossibleAnswers(Set<Clause> resolvents) {
// If no bindings being looked for, then
// is just a true false query.
for (Clause aClause : resolvents) {
if (answerClause.isEmpty()) {
if (aClause.isEmpty()) {
proofs.add(new ProofFinal(aClause.getProofStep(), new HashMap<Variable, Term>()));
complete = true;
}
} else {
if (aClause.isEmpty()) {
// This should not happen
// as added an answer literal, which
// implies the database (i.e. premises) are
// unsatisfiable to begin with.
throw new IllegalStateException(
"Generated an empty clause while looking for an answer, implies original KB is unsatisfiable");
}
if (aClause.isUnitClause()
&& aClause.isDefiniteClause()
&& aClause
.getPositiveLiterals()
.get(0)
.getAtomicSentence()
.getSymbolicName()
.equals(answerLiteral.getAtomicSentence().getSymbolicName())) {
Map<Variable, Term> answerBindings = new HashMap<Variable, Term>();
List<Term> answerTerms =
aClause.getPositiveLiterals().get(0).getAtomicSentence().getArgs();
int idx = 0;
for (Variable v : answerLiteralVariables) {
answerBindings.put(v, answerTerms.get(idx));
idx++;
}
boolean addNewAnswer = true;
for (Proof p : proofs) {
if (p.getAnswerBindings().equals(answerBindings)) {
addNewAnswer = false;
break;
}
}
if (addNewAnswer) {
proofs.add(new ProofFinal(aClause.getProofStep(), answerBindings));
}
}
}
if (System.currentTimeMillis() > finishTime) {
complete = true;
// Indicate that I have run out of query time
timedOut = true;
}
}
}
