@Override
public final int diff(final Item it, final Collation coll, final InputInfo ii)
throws QueryException {
return it.type.isUntyped()
? coll == null ? Token.diff(string(), it.string(ii)) : coll.compare(string(), it.string(ii))
: -it.diff(this, coll, ii);
}
/**
* Checks two keys for equality.
*
* @param its1 first keys
* @param its2 second keys
* @param coll collations
* @return {@code true} if the compare as equal, {@code false} otherwise
* @throws QueryException query exception
*/
private boolean eq(final Item[] its1, final Item[] its2, final Collation[] coll)
throws QueryException {
final int il = its1.length;
for (int i = 0; i < il; i++) {
final Item it1 = its1[i], it2 = its2[i];
if (it1 == null ^ it2 == null || it1 != null && !it1.equiv(it2, coll[i], info)) return false;
}
return true;
}
@Override
public final boolean eq(
final Item it, final Collation coll, final StaticContext sc, final InputInfo ii)
throws QueryException {
return it.type.isUntyped()
? coll == null
? Token.eq(string(), it.string(ii))
: coll.compare(string(), it.string(ii)) == 0
: it.eq(this, coll, sc, ii);
}
/**
* Returns a minimum or maximum item.
*
* @param cmp comparator
* @param qc query context
* @return resulting item
* @throws QueryException query exception
*/
Item minmax(final OpV cmp, final QueryContext qc) throws QueryException {
final Collation coll = toCollation(1, qc);
final Iter iter = exprs[0].atomIter(qc, info);
Item curr = iter.next();
if (curr == null) return null;
// check if first item is comparable
cmp.eval(curr, curr, coll, sc, info);
// strings
if (curr instanceof AStr) {
for (Item it; (it = iter.next()) != null; ) {
if (!(it instanceof AStr)) throw EXPTYPE_X_X_X.get(info, curr.type, it.type, it);
final Type rt = curr.type, ri = it.type;
if (cmp.eval(curr, it, coll, sc, info)) curr = it;
if (rt != ri && curr.type == URI) curr = STR.cast(curr, qc, sc, info);
}
return curr;
}
// dates, durations, booleans, binary values
if (curr instanceof ADate || curr instanceof Dur || curr instanceof Bin || curr.type == BLN) {
for (Item it; (it = iter.next()) != null; ) {
if (curr.type != it.type) throw EXPTYPE_X_X_X.get(info, curr.type, it.type, it);
if (cmp.eval(curr, it, coll, sc, info)) curr = it;
}
return curr;
}
// numbers
if (curr.type.isUntyped()) curr = DBL.cast(curr, qc, sc, info);
for (Item it; (it = iter.next()) != null; ) {
final Type type = numType(curr, it);
if (cmp.eval(curr, it, coll, sc, info) || Double.isNaN(it.dbl(info))) curr = it;
if (type != null) curr = (Item) type.cast(curr, qc, sc, info);
}
return curr;
}
