Examples of javax.xml.xquery.XQException

javax.xml.xquery.XQException
An exception that provides information on XQJ, XQuery or other errors reported by an XQJ implementation.

Each XQException provides several kinds of information:
- a string describing the error. This is used as the Java Exception message, available via the method getMessage.
- the cause of the error. This is used as the Java Exception cause, available via the method getCause.
- the vendor code identifying the error. Available via the method getVendorCode. Refer to the vendor documentation which specific codes can be returned.
- a chain of XQException objects. If more than one error occurred the exceptions are referenced via this chain.
Note that XQException has a subclass {@link XQQueryException XQQueryException} providing more detailedinformation about errors that occurred during the processing of a query. An implementation throws a base XQException when an error occurs in the XQJ implementation. Further, implementations are encouraged to use the more detailed XQQueryException in case of an error reported by the XQuery engine.

It is possible that during the processing of a query that one or more errors could occur, each with their own potential causal relationship. This means that when an XQJ application catches an XQException, there is a possibility that there may be additional XQException objects chained to the original thrown XQException. To access the additional chained XQException objects, an application would recursively invoke getNextException until a null value is returned.

An XQException may have a causal relationship, which consists of one or more Throwable instances which caused the XQException to be thrown. The application may recursively call the method getCause, until a null value is returned, to navigate the chain of causes.

    public float getFloat() throws XQException {
        checkNotClosed();
        if (item instanceof FloatValue) {
            return ((FloatValue)item).getFloatValue();
        }
        throw new XQException("Failed in getFloat: item is not a float, or is closed");
    }

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        checkNotClosed();
        if (item instanceof AtomicValue) {
            AtomicValue prim = ((AtomicValue)item);
            return (byte)longValue(prim, Integer.MIN_VALUE, Integer.MAX_VALUE);
        }
        throw new XQException("Failed in getInt: item is not an atomic value, or is closed");
    }

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    }


    public Node getNode() throws XQException {
        checkNotClosed();
        if (!(item instanceof NodeInfo)) {
            throw new XQException("Failed in getNode: item is an atomic value, or is closed");
        }
        if (item instanceof VirtualNode) {
            Object n = ((VirtualNode)item).getUnderlyingNode();
            if (n instanceof Node) {
                return (Node)n;

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                if (systemId == null) {
                    return new URI("");
                }
                return new URI(systemId);
            } catch (URISyntaxException e) {
                throw new XQException("System ID of node is not a valid URI");
            }
        }
        throw new XQException("Item is not a node");
    }

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        checkNotClosed();
        if (item instanceof AtomicValue) {
            AtomicValue prim = ((AtomicValue)item);
            return (byte)longValue(prim, Short.MIN_VALUE, Short.MAX_VALUE);
        }
        throw new XQException("Failed in getShort: item is not an atomic value, or is closed");
    }

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            TreeReceiver tr = new TreeReceiver(out);
            tr.open();
            tr.append(item, 0, NodeInfo.ALL_NAMESPACES);
            tr.close();
        } catch (XPathException e) {
            XQException xqe = new XQException(e.getMessage());
            xqe.initCause(e);
            throw xqe;
        }
    }

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        writeItemToResult(new SAXResult(saxHandler));
    }


    private void checkNotNull(Object arg) throws XQException {
        if (arg == null) {
            throw new XQException("Argument is null");
        }
    }

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    public void setScrollability(int scrollability) throws XQException {
        readOnly();
    }


    private void readOnly() throws XQException {
        throw new XQException("This XQStaticContext object is read-only");
    }

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     * @throws XQException if the object has been closed
     */


    final void checkNotClosed() throws XQException {
        if (isClosed()) {
            throw new XQException("The XQJ object has been closed");
        }
    }

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                                return new Long(((Int64Value)p).longValue());
                            case StandardNames.XS_SHORT:
                            case StandardNames.XS_UNSIGNED_BYTE:
                                return new Short((short)((Int64Value)p).longValue());
                            default:
                                throw new XQException("Unrecognized integer subtype " + sub);
                        }
                    }
                case StandardNames.XS_QNAME:
                    return ((QualifiedNameValue)p).makeQName(config);
                case StandardNames.XS_STRING:
                case StandardNames.XS_UNTYPED_ATOMIC:
                    return p.getStringValue();
                case StandardNames.XS_TIME:
                    return new SaxonXMLGregorianCalendar((CalendarValue)p);
                case StandardNames.XS_DAY_TIME_DURATION:
                    return new SaxonDuration((DurationValue)p);
                case StandardNames.XS_YEAR_MONTH_DURATION:
                    return new SaxonDuration((DurationValue)p);
                default:
                    throw new XQException("unsupported type");
            }
        } else {
            return NodeOverNodeInfo.wrap((NodeInfo)item);
        }
    }

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