public static IList compose(IList rel1, IList rel2) {
Type otherTupleType = rel2.getType().getFieldTypes();
if (rel1.getElementType() == voidType) return rel1;
if (otherTupleType == voidType) return rel2;
if (rel1.getElementType().getArity() != 2 || otherTupleType.getArity() != 2)
throw new IllegalOperationException("compose", rel1.getElementType(), otherTupleType);
// Relaxed type constraint:
if (!rel1.getElementType().getFieldType(1).comparable(otherTupleType.getFieldType(0)))
throw new IllegalOperationException("compose", rel1.getElementType(), otherTupleType);
Type[] newTupleFieldTypes =
new Type[] {rel1.getElementType().getFieldType(0), otherTupleType.getFieldType(1)};
Type tupleType = typeFactory.tupleType(newTupleFieldTypes);
IListWriter w = new ListWriter(tupleType);
for (IValue v1 : rel1) {
ITuple tuple1 = (ITuple) v1;
for (IValue t2 : rel2) {
ITuple tuple2 = (ITuple) t2;
if (tuple1.get(1).isEqual(tuple2.get(0))) {
w.append(Tuple.newTuple(tuple1.get(0), tuple2.get(1)));
}
}
}
return w.done();
}
public static IList project(IList rel1, int... fields) {
IListWriter w = ValueFactory.getInstance().listWriter();
for (IValue v : rel1) {
w.append(((ITuple) v).select(fields));
}
return w.done();
}
public static IList domain(IList rel1) {
Type lrelType = rel1.getType();
IListWriter w = List.createListWriter(lrelType.getFieldType(0));
HashSet<IValue> cache = new HashSet<>();
for (IValue elem : rel1) {
ITuple tuple = (ITuple) elem;
IValue e = tuple.get(0);
if (!cache.contains(e)) {
cache.add(e);
w.append(e);
}
}
return w.done();
}
public static IList carrier(IList rel1) {
Type newType = rel1.getType().carrier();
IListWriter w = List.createListWriter(newType.getElementType());
HashSet<IValue> cache = new HashSet<>();
for (IValue v : rel1) {
ITuple t = (ITuple) v;
for (IValue e : t) {
if (!cache.contains(e)) {
cache.add(e);
w.append(e);
}
}
}
return w.done();
}
public static IList closure(IList rel1) {
Type resultType = rel1.getType().closure(); // will throw exception if not binary and reflexive
IList tmp = rel1;
int prevCount = 0;
ShareableValuesHashSet addedTuples = new ShareableValuesHashSet();
while (prevCount != tmp.length()) {
prevCount = tmp.length();
IList tcomp = compose(tmp, tmp);
IListWriter w = List.createListWriter(resultType.getElementType());
for (IValue t1 : tcomp) {
if (!tmp.contains(t1)) {
if (!addedTuples.contains(t1)) {
addedTuples.add(t1);
w.append(t1);
}
}
}
tmp = tmp.concat(w.done());
addedTuples.clear();
}
return tmp;
}