示例#1
0
  @Override
  public Item item(final QueryContext qc, final InputInfo ii) throws QueryException {
    final QNm name = toQNm(exprs[0], qc, sc, false);
    final long arity = toLong(exprs[1], qc);
    if (arity < 0 || arity > Integer.MAX_VALUE) throw FUNCUNKNOWN_X.get(ii, name);

    try {
      final Expr lit = Functions.getLiteral(name, (int) arity, qc, sc, ii);
      return lit == null ? null : lit.item(qc, ii);
    } catch (final QueryException e) {
      // function not found (in most cases: XPST0017)
      return null;
    }
  }
示例#2
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 /**
  * Checks if the specified expression yields an element. Returns the element or throws an
  * exception.
  *
  * @param ex expression to be evaluated
  * @param qc query context
  * @return binary item
  * @throws QueryException query exception
  */
 protected final ANode toElem(final Expr ex, final QueryContext qc) throws QueryException {
   return (ANode) checkType(ex.item(qc, info), NodeType.ELM);
 }
示例#3
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 /**
  * Checks if the specified expression yields a non-empty item. Returns the item or throws an
  * exception.
  *
  * @param ex expression to be evaluated
  * @param qc query context
  * @param type expected type
  * @return item
  * @throws QueryException query exception
  */
 private Item toItem(final Expr ex, final QueryContext qc, final Type type) throws QueryException {
   return checkNoEmpty(ex.item(qc, info), type);
 }
示例#4
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 /**
  * Checks if the evaluated expression yields a non-empty item. Returns the item or throws an
  * exception.
  *
  * @param ex expression to be evaluated
  * @param qc query context
  * @return item
  * @throws QueryException query exception
  */
 protected final Item toItem(final Expr ex, final QueryContext qc) throws QueryException {
   return checkNoEmpty(ex.item(qc, info));
 }
示例#5
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 /**
  * Checks if the specified expression yields a node or {@code null}. Returns the node, {@code
  * null}, or throws an exception.
  *
  * @param ex expression to be evaluated
  * @param qc query context
  * @return node or {@code null}
  * @throws QueryException query exception
  */
 protected final ANode toEmptyNode(final Expr ex, final QueryContext qc) throws QueryException {
   final Item it = ex.item(qc, info);
   return it == null ? null : toNode(it);
 }
示例#6
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 /**
  * Checks if the specified expression yields a node. Returns the boolean or throws an exception.
  *
  * @param ex expression to be evaluated
  * @param qc query context
  * @return node
  * @throws QueryException query exception
  */
 protected final ANode toNode(final Expr ex, final QueryContext qc) throws QueryException {
   return toNode(checkNoEmpty(ex.item(qc, info), NodeType.NOD));
 }
示例#7
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文件: FnHead.java 项目: BaseXdb/basex
 @Override
 public Item item(final QueryContext qc, final InputInfo ii) throws QueryException {
   final Expr e = exprs[0];
   return e.seqType().zeroOrOne() ? e.item(qc, info) : e.iter(qc).next();
 }