示例#1
0
  @Override
  public Iter iter(final QueryContext ctx) throws QueryException {
    final Iter iter = ctx.iter(expr);
    final Item it = iter.next();
    if (it == null) {
      if (type.mayBeZero()) return Empty.ITER;
      throw XPEMPTY.thrw(input, desc());
    }
    if (type.zeroOrOne()) {
      if (iter.next() != null) NOTREATS.thrw(input, desc(), type);
      if (!it.type.instance(type.type)) NOTREAT.thrw(input, desc(), type, it.type);
      return it.iter();
    }

    return new Iter() {
      Item i = it;

      @Override
      public Item next() throws QueryException {
        if (i == null) return null;
        if (!i.type.instance(type.type)) NOTREAT.thrw(input, desc(), type, i.type);
        final Item ii = i;
        i = iter.next();
        return ii;
      }
    };
  }
示例#2
0
  @Override
  public Value value(final QueryContext ctx) throws QueryException {
    final Value val = ctx.value(expr);

    final long len = val.size();
    if (len == 0) {
      if (type.mayBeZero()) return val;
      throw XPEMPTY.thrw(input, desc());
    }
    if (type.zeroOrOne()) {
      if (len > 1) throw NOTREATS.thrw(input, desc(), type);
      final Item it = val.itemAt(0);
      if (!it.type.instance(type.type)) NOTREAT.thrw(input, desc(), type, it.type);
      return it;
    }

    for (long i = 0; i < len; i++) {
      final Item it = val.itemAt(i);
      if (!it.type.instance(type.type)) NOTREAT.thrw(input, desc(), type, it.type);
    }

    return val;
  }
示例#3
0
 /**
  * Checks if the specified item is an empty sequence; if yes, throws an exception.
  *
  * @param it item to be checked
  * @return specified item
  * @throws QueryException query exception
  */
 public final Item checkEmpty(final Item it) throws QueryException {
   if (it == null) XPEMPTY.thrw(input, desc());
   return it;
 }