@Override
public Item item(final QueryContext ctx, final InputInfo ii) throws QueryException {
switch (def) {
case ENVAR:
final String e = System.getenv(Token.string(checkEStr(expr[0], ctx)));
return e != null ? Str.get(e) : null;
default:
return super.item(ctx, ii);
}
}
@Override
public Iter iter(final QueryContext ctx) throws QueryException {
switch (def) {
case ERROR:
final int al = expr.length;
if (al == 0) FUNERR1.thrw(input);
String code = FUNERR1.code();
String msg = FUNERR1.desc;
final Item it = expr[0].item(ctx, input);
if (it == null) {
if (al == 1) XPEMPTY.thrw(input, desc());
} else {
code = Token.string(((QNm) checkType(it, AtomType.QNM)).ln());
}
if (al > 1) msg = Token.string(checkEStr(expr[1], ctx));
final Value val = al > 2 ? expr[2].value(ctx) : null;
final QueryException ex = new QueryException(input, code, val, msg);
throw ex;
case TRACE:
return new Iter() {
final Iter ir = expr[0].iter(ctx);
final byte[] s = checkEStr(expr[1], ctx);
@Override
public Item next() throws QueryException {
final Item i = ir.next();
if (i != null) {
final TokenBuilder tb = new TokenBuilder(s);
if (s.length != 0) tb.add(": ");
tb.add(i.toString());
// if GUI is used, or if user is no admin, trace info is cached
if (Prop.gui || !ctx.context.user.perm(User.ADMIN)) {
ctx.evalInfo(tb.finish());
} else {
Util.errln(tb);
}
}
return i;
}
};
case ENVARS:
final ItemCache ic = new ItemCache();
for (final Object k : System.getenv().keySet().toArray()) {
ic.add(Str.get(k));
}
return ic;
default:
return super.iter(ctx);
}
}