Examples of net.sf.saxon.trans.XPathException

net.sf.saxon.trans.XPathException
XPathException is used to indicate an error in an XPath expression. It will generally be either a StaticError or a DynamicError; ValidationExceptions (arising from schema validation) form a third category


        if (contextItem != null) {
            // Check the type of the context item against the API-defined required type
            if (!staticContext.getUserQueryContext().getRequiredContextItemType().matchesItem(
                    contextItem, false, dynamicEnv.getConfiguration())) {
                throw new XPathException("The supplied context item does not match the required context item type");
            }
            // Now check it against the required type defined in the query prolog
            StructuredQName varQName = executable.getInitialContextItemVariableName();
            if (varQName != null) {
                GlobalVariable var = executable.getGlobalVariable(varQName);

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        public Object convert(ValueRepresentation value, Class targetClass, XPathContext context) throws XPathException {
            try {
                return new URL(value.getStringValue());
            } catch (MalformedURLException err) {
                throw new XPathException("The anyURI value '" + value + "' is not an acceptable Java URL");
            }
        }

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                Object o = ((VirtualNode)item).getRealNode();
                if (o instanceof Node) {
                    nodes.add((Node)o);
                } else {
                    if (requireDOM) {
                        throw new XPathException(
                                "Cannot convert XPath value to Java object: required class is " + target.getName() +
                                "; supplied value has type " + Type.displayTypeName(item));
                    }
                }
            } else if (requireDOM) {
                if (item instanceof NodeInfo) {
                    nodes.add(NodeOverNodeInfo.wrap((NodeInfo)item));
                } else {
                    throw new XPathException(
                                "Cannot convert XPath value to Java object: required class is " + target.getName() +
                                "; supplied value has type " + Type.displayTypeName(item));
                }
            } else {
                return null;    // DOM Nodes are not actually required; let someone else try the conversion
            }
        }


        if (nodes.size() == 0 && !requireDOM) {
            return null;  // empty sequence supplied - try a different mapping
        }
        if (Node.class.isAssignableFrom(target)) {
            if (nodes.size() != 1) {
                throw new XPathException("Cannot convert XPath value to Java object: requires a single DOM Node" +
                        "but supplied value contains " + nodes.size() + " nodes");
            }
            return nodes.get(0);
            // could fail if the node is of the wrong kind
        } else if (target == NodeList.class) {

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        if (name.equals("parent"))                  return PARENT;
        if (name.equals("preceding"))               return PRECEDING;
        if (name.equals("preceding-sibling"))       return PRECEDING_SIBLING;
        if (name.equals("self"))                    return SELF;
        // preceding-or-ancestor cannot be used in an XPath expression
        throw new XPathException("Unknown axis name: " + name);
    }

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     */


    public void append(Item item, int locationId, int copyNamespaces) throws XPathException {
        if (item instanceof FunctionItem) {
            // TODO: implement this
            throw new XPathException("Wrapped output: cannot display a function item");
        } else if (item instanceof ObjectValue) {
            // TODO: implement this
            throw new XPathException("Wrapped output: cannot display an external Java object");
        } else if (item instanceof AtomicValue) {
            final NamePool pool = getNamePool();
            out.startElement(resultAtomicValue, StandardNames.XS_UNTYPED, 0, 0);
            AtomicType type = (AtomicType)((AtomicValue)item).getItemType(getConfiguration().getTypeHierarchy());
            int nameCode = type.getNameCode();

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        AtomicType t0 = operand0.getItemType(th).getAtomizedItemType();
        AtomicType t1 = operand1.getItemType(th).getAtomizedItemType();


        if (t0.isExternalType() || t1.isExternalType()) {
            XPathException err = new XPathException("Cannot perform comparisons involving external objects");
            err.setIsTypeError(true);
            err.setErrorCode("XPTY0004");
            err.setLocator(this);
            throw err;
        }


        BuiltInAtomicType p0 = (BuiltInAtomicType)t0.getPrimitiveItemType();
        if (p0.equals(BuiltInAtomicType.UNTYPED_ATOMIC)) {
            p0 = BuiltInAtomicType.STRING;
        }
        BuiltInAtomicType p1 = (BuiltInAtomicType)t1.getPrimitiveItemType();
        if (p1.equals(BuiltInAtomicType.UNTYPED_ATOMIC)) {
            p1 = BuiltInAtomicType.STRING;
        }


        needsRuntimeCheck =
                p0.equals(BuiltInAtomicType.ANY_ATOMIC) || p1.equals(BuiltInAtomicType.ANY_ATOMIC);


        if (!needsRuntimeCheck && !Type.isComparable(p0, p1, Token.isOrderedOperator(operator))) {
            boolean opt0 = Cardinality.allowsZero(operand0.getCardinality());
            boolean opt1 = Cardinality.allowsZero(operand1.getCardinality());
            if (opt0 || opt1) {
                // This is a comparison such as (xs:integer? eq xs:date?). This is almost
                // certainly an error, but we need to let it through because it will work if
                // one of the operands is an empty sequence.


                String which = null;
                if (opt0) which = "the first operand is";
                if (opt1) which = "the second operand is";
                if (opt0 && opt1) which = "one or both operands are";


                visitor.getStaticContext().issueWarning("Comparison of " + t0.toString(namePool) +
                        (opt0 ? "?" : "") + " to " + t1.toString(namePool) +
                        (opt1 ? "?" : "") + " will fail unless " + which + " empty", this);
                needsRuntimeCheck = true;
            } else {
                XPathException err = new XPathException("Cannot compare " + t0.toString(namePool) +
                        " to " + t1.toString(namePool));
                err.setIsTypeError(true);
                err.setErrorCode("XPTY0004");
                err.setLocator(this);
                throw err;
            }
        }
        if (!(operator == Token.FEQ || operator == Token.FNE)) {
            if (!p0.isOrdered()) {
                XPathException err = new XPathException("Type " + t0.toString(env.getNamePool()) + " is not an ordered type");
                err.setErrorCode("XPTY0004");
                err.setIsTypeError(true);
                err.setLocator(this);
                throw err;
            }
            if (!p1.isOrdered()) {
                XPathException err = new XPathException("Type " + t1.toString(env.getNamePool()) + " is not an ordered type");
                err.setErrorCode("XPTY0004");
                err.setIsTypeError(true);
                err.setLocator(this);
                throw err;
            }
        }


        if (comparer == null) {

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    * @exception net.sf.saxon.trans.XPathException On any error in the document
    */


    public void send() throws XPathException {
        if (root==null) {
            throw new XPathException("DOMSender: no start node defined");
        }
        if (receiver==null) {
            throw new XPathException("DOMSender: no receiver defined");
        }


        receiver.setSystemId(systemId);
        pipe.setLocationProvider(this);
        receiver.setPipelineConfiguration(pipe);

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    private void outputElement(Element element, NamedNodeMap atts) throws XPathException {
        final Configuration config = pipe.getConfiguration();
        String[] elparts2 = nsSupport.processName(element.getTagName(), elparts, false);
        if (elparts2==null) {
              throw new XPathException("Undeclared namespace in " + element.getTagName());
        }
        String uri = elparts2[0];
        String local = elparts2[1];
        String prefix = NameChecker.getPrefix(elparts2[2]);


        NamePool namePool = config.getNamePool();
        int nameCode = namePool.allocate(prefix, uri, local);


        receiver.startElement(nameCode, StandardNames.XS_UNTYPED, 0, 0);
        for (Iterator<String> iter = nsDeclarations.keySet().iterator(); iter.hasNext();) {
            String nsprefix = iter.next();
            String nsuri = nsDeclarations.get(nsprefix);
            receiver.namespace(namePool.allocateNamespaceCode(nsprefix, nsuri), 0);
        }


        if (atts != null) {
            final int len = atts.getLength();
            for (int a2=0; a2<len; a2++) {
                Attr att = (Attr)atts.item(a2);
                String attname = att.getName();
                if (attname.startsWith("xmlns") && (attname.equals("xmlns") || attname.startsWith("xmlns:"))) {
                    // do nothing
                } else {
                    //System.err.println("Processing attribute " + attname);
                    String[] parts2 = nsSupport.processName(attname, parts, true);
                    if (parts2==null) {
                          throw new XPathException("Undeclared namespace in " + attname);
                    }
                    String atturi = parts2[0];
                    String attlocal = parts2[1];
                    String attprefix = NameChecker.getPrefix(parts2[2]);

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            }


        case BUSY:
            // recursive entry: can happen if there is a circularity involving variable and function definitions
            // Can also happen if variable evaluation is attempted in a debugger, hence the cautious message
            XPathException de = new XPathException("Attempt to access a variable while it is being evaluated");
            de.setErrorCode("XTDE0640");
            //de.setXPathContext(context);
            throw de;


        case EMPTY:
            return EmptyIterator.getInstance();

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        // context supplied at evaluation time
        if (state == EMPTY) {
            return;     // we know there is nothing to do
        } else if (state == BUSY) {
            // recursive entry: can happen if there is a circularity involving variable and function definitions
            XPathException de = new XPathException("Attempt to access a variable while it is being evaluated");
            de.setErrorCode("XTDE0640");
            de.setXPathContext(context);
            throw de;
        }
        if (reservoir != null) {
            SequenceIterator iter = iterate();
            SequenceReceiver out = context.getReceiver();

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