public static Set<DefaultRule> selectNonisomorphicDefaultRules(
Iterable<DefaultRule> defaultRules) {
List<Clause> candidates = new ArrayList<Clause>();
for (DefaultRule rule : defaultRules) {
DefaultRule preprocessed = preprocess(rule);
candidates.add(
new Clause(
Sugar.<Literal>iterable(
preprocessed.antecedent().literals(), preprocessed.consequent().literals())));
}
Matching m = new Matching();
Set<DefaultRule> retVal = new HashSet<DefaultRule>();
for (Clause c : m.nonisomorphic(candidates)) {
List<Literal> head = new ArrayList<Literal>();
List<Literal> body = new ArrayList<Literal>();
for (Literal l : c.literals()) {
Literal newLiteral =
new Literal(
l.predicate().substring(l.predicate().indexOf(":") + 1), l.isNegated(), l.arity());
for (int i = 0; i < l.arity(); i++) {
newLiteral.set(l.get(i), i);
}
if (l.predicate().startsWith("antecedent:")
|| l.predicate().startsWith(SymmetricPredicates.PREFIX + "antecedent:")) {
body.add(newLiteral);
} else {
head.add(newLiteral);
}
}
retVal.add(new DefaultRule(new Clause(body), new Clause(head)));
}
return retVal;
}
private static Clause preprocessClause(Clause c, String prefix) {
List<Literal> newLiterals = new ArrayList<Literal>();
int specialID = 0;
for (Literal l : c.literals()) {
String predicate = l.predicate();
if (predicate.equals(SpecialBinaryPredicates.NEQ)
|| predicate.equals(SpecialBinaryPredicates.EQ)
|| predicate.equals(SpecialVarargPredicates.ALLDIFF)) {
predicate = SymmetricPredicates.PREFIX + prefix + predicate;
} else {
predicate = prefix + predicate;
}
Literal newLit = new Literal(predicate, l.isNegated(), l.arity());
for (int i = 0; i < l.arity(); i++) {
newLit.set(l.get(i), i);
}
newLiterals.add(newLit);
}
return new Clause(newLiterals);
}