/**
* Adds and returns a user-defined function that has not been defined yet.
*
* @param name name of the function
* @param args optional arguments
* @param ii input info
* @return function instance
* @throws QueryException query exception
*/
TypedFunc add(final QNm name, final Expr[] args, final InputInfo ii) throws QueryException {
// add function call for function that has not been declared yet
final int al = args.length;
final UserFunc uf = new UserFunc(ii, name, new Var[al], null, null, false);
final UserFuncCall call = add(ii, name, add(uf, ii), args);
final FuncType type = FuncType.arity(al);
return new TypedFunc(call, type);
}
/**
* Returns the specified function.
*
* @param name name of the function
* @param args optional arguments
* @param ii input info
* @return function instance
*/
TypedFunc get(final QNm name, final Expr[] args, final InputInfo ii) {
final int id = indexOf(name, args);
if (id == -1) return null;
// function has already been declared
final UserFuncCall call = add(ii, funcs[id].name, id, args);
final FuncType type = FuncType.get(funcs[id]);
return new TypedFunc(call, type);
}
/**
* Returns an instance of a with the specified name and number of arguments, or {@code null}.
*
* @param name name of the function
* @param args optional arguments
* @param dyn compile-/run-time flag
* @param ctx query context
* @param ii input info
* @return function instance
* @throws QueryException query exception
*/
public static TypedFunc get(
final QNm name,
final Expr[] args,
final boolean dyn,
final QueryContext ctx,
final InputInfo ii)
throws QueryException {
// get namespace and local name
// parse data type constructors
if (eq(name.uri(), XSURI)) {
final byte[] ln = name.local();
final AtomType type = AtomType.find(name, false);
if (type == null) {
final Levenshtein ls = new Levenshtein();
for (final AtomType t : AtomType.values()) {
if (t.par != null
&& t != AtomType.NOT
&& t != AtomType.AAT
&& t != AtomType.BIN
&& ls.similar(lc(ln), lc(t.string()), 0))
FUNSIMILAR.thrw(ii, name.string(), t.string());
}
}
// no constructor function found, or abstract type specified
if (type == null || type == AtomType.NOT || type == AtomType.AAT) {
FUNCUNKNOWN.thrw(ii, name.string());
}
if (args.length != 1) FUNCTYPE.thrw(ii, name.string());
final SeqType to = SeqType.get(type, Occ.ZERO_ONE);
return TypedFunc.constr(new Cast(ii, args[0], to), to);
}
// pre-defined functions
final StandardFunc fun = Functions.get().get(name, args, ii);
if (fun != null) {
if (!ctx.sc.xquery3 && fun.xquery3()) FEATURE30.thrw(ii);
for (final Function f : Function.UPDATING) {
if (fun.sig == f) {
ctx.updating(true);
break;
}
}
return new TypedFunc(fun, fun.sig.type(args.length));
}
// user-defined function
final TypedFunc tf = ctx.funcs.get(name, args, ii);
if (tf != null) return tf;
// Java function (only allowed with administrator permissions)
final JavaMapping jf = JavaMapping.get(name, args, ctx, ii);
if (jf != null) return TypedFunc.java(jf);
// add user-defined function that has not been declared yet
if (!dyn && FuncType.find(name) == null) return ctx.funcs.add(name, args, ii, ctx);
// no function found
return null;
}