/**
* Checks if the specified item is a QName. Returns the item or throws an exception.
*
* @param it item
* @param empty allow empty result
* @return QNm item
* @throws QueryException query exception
*/
protected final QNm toQNm(final Item it, final boolean empty) throws QueryException {
if (empty && it == null) return null;
final Type ip = checkNoEmpty(it, AtomType.QNM).type;
if (ip == AtomType.QNM) return (QNm) it;
if (ip.isUntyped()) throw NSSENS_X_X.get(info, ip, AtomType.QNM);
throw castError(it, AtomType.QNM, info);
}
/**
* Returns the new target type, or {@code null} if conversion is not necessary.
*
* @param curr old item
* @param it new item
* @return result (or {@code null})
* @throws QueryException query exception
*/
private AtomType numType(final Item curr, final Item it) throws QueryException {
final Type ti = it.type;
if (ti.isUntyped()) return DBL;
final Type tc = curr.type;
if (!(it instanceof ANum)) throw EXPTYPE_X_X_X.get(info, tc, ti, it);
return tc == ti ? null : tc == DBL || ti == DBL ? DBL : tc == FLT || ti == FLT ? FLT : null;
}
/**
* Converts the specified result to an XQuery value.
*
* @param obj result object
* @param qc query context
* @param sc static context
* @return value
* @throws QueryException query exception
*/
public static Value toValue(final Object obj, final QueryContext qc, final StaticContext sc)
throws QueryException {
if (obj == null) return Empty.SEQ;
if (obj instanceof Value) return (Value) obj;
if (obj instanceof Iter) return ((Iter) obj).value();
// find XQuery mapping for specified type
final Type type = type(obj);
if (type != null) return type.cast(obj, qc, sc, null);
// primitive arrays
if (obj instanceof byte[]) return BytSeq.get((byte[]) obj);
if (obj instanceof long[]) return IntSeq.get((long[]) obj, AtomType.ITR);
if (obj instanceof char[]) return Str.get(new String((char[]) obj));
if (obj instanceof boolean[]) return BlnSeq.get((boolean[]) obj);
if (obj instanceof double[]) return DblSeq.get((double[]) obj);
if (obj instanceof float[]) return FltSeq.get((float[]) obj);
// no array: return Java type
if (!obj.getClass().isArray()) return new Jav(obj, qc);
// empty array
final int s = Array.getLength(obj);
if (s == 0) return Empty.SEQ;
// string array
if (obj instanceof String[]) {
final String[] r = (String[]) obj;
final byte[][] b = new byte[r.length][];
for (int v = 0; v < s; v++) b[v] = token(r[v]);
return StrSeq.get(b);
}
// character array
if (obj instanceof char[][]) {
final char[][] r = (char[][]) obj;
final byte[][] b = new byte[r.length][];
for (int v = 0; v < s; v++) b[v] = token(new String(r[v]));
return StrSeq.get(b);
}
// short array
if (obj instanceof short[]) {
final short[] r = (short[]) obj;
final long[] b = new long[r.length];
for (int v = 0; v < s; v++) b[v] = r[v];
return IntSeq.get(b, AtomType.SHR);
}
// integer array
if (obj instanceof int[]) {
final int[] r = (int[]) obj;
final long[] b = new long[r.length];
for (int v = 0; v < s; v++) b[v] = r[v];
return IntSeq.get(b, AtomType.INT);
}
// any other array (also nested ones)
final Object[] objs = (Object[]) obj;
final ValueBuilder vb = new ValueBuilder(objs.length);
for (final Object o : objs) vb.add(toValue(o, qc, sc));
return vb.value();
}
@Override
public Expr optimize(final QueryContext ctx, final VarScope scp) throws QueryException {
final SeqType s0 = expr[0].type();
final SeqType s1 = expr[1].type();
final Type t0 = s0.type;
final Type t1 = s1.type;
if (t0.isNumberOrUntyped() && t1.isNumberOrUntyped()) {
final Occ occ = s0.one() && s1.one() ? Occ.ONE : Occ.ZERO_ONE;
type = SeqType.get(Calc.type(t0, t1), occ);
} else if (s0.one() && s1.one()) {
type = SeqType.ITEM;
}
return optPre(oneIsEmpty() ? null : allAreValues() ? item(ctx, info) : this, ctx);
}
/**
* 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;
}
@Override
public Test intersect(final Test other) {
if (other instanceof NodeTest) {
final NodeTest o = (NodeTest) other;
if (type != null && o.type != null && type != o.type) return null;
final NodeType nt = type != null ? type : o.type;
if (name != null && o.name != null && !name.eq(o.name)) return null;
final QNm n = name != null ? name : o.name;
final boolean both = ext != null && o.ext != null;
final Type e = ext == null ? o.ext : o.ext == null ? ext : ext.intersect(o.ext);
return both && e == null ? null : new NodeTest(nt, n, e, strip || o.strip);
}
if (other instanceof KindTest) {
return type.instanceOf(other.type) ? this : null;
}
if (other instanceof NameTest) {
throw Util.notExpected(other);
}
return null;
}
/**
* Checks if the specified item is a number. Returns a token representation or throws an
* exception.
*
* @param it item to be checked
* @return number
* @throws QueryException query exception
*/
protected final long toLong(final Item it) throws QueryException {
final Type ip = checkNoEmpty(it, AtomType.ITR).type;
if (ip.instanceOf(AtomType.ITR) || ip.isUntyped()) return it.itr(info);
throw castError(it, AtomType.ITR, info);
}
/**
* Checks if the specified item is a boolean. Returns the boolean or throws an exception.
*
* @param it item be checked
* @return boolean
* @throws QueryException query exception
*/
protected final boolean toBoolean(final Item it) throws QueryException {
final Type ip = checkNoEmpty(it, AtomType.BLN).type;
if (ip == AtomType.BLN) return it.bool(info);
if (ip.isUntyped()) return Bln.parse(it.string(info), info);
throw castError(it, AtomType.BLN, info);
}
/**
* Checks if the specified non-empty item is a string. Returns its value as token or throws an
* exception.
*
* @param it item to be checked
* @return token
* @throws QueryException query exception
*/
protected final byte[] toToken(final Item it) throws QueryException {
final Type ip = it.type;
if (ip.isStringOrUntyped()) return it.string(info);
throw it instanceof FItem ? FIATOM_X.get(info, it.type) : castError(it, AtomType.STR, info);
}