Examples of javax.xml.xpath.XPath.evaluate()

javax.xml.xpath.XPath.evaluate()

Evaluate an XPath expression in the specified context and return the result as the specified type.

See Evaluation of XPath Expressions for context item evaluation, variable, function and QName resolution and return type conversion.

If returnType is not one of the types defined in {@link XPathConstants} ({@link XPathConstants#NUMBER NUMBER}, {@link XPathConstants#STRING STRING}, {@link XPathConstants#BOOLEAN BOOLEAN}, {@link XPathConstants#NODE NODE} or{@link XPathConstants#NODESET NODESET}) then an IllegalArgumentException is thrown.

If a null value is provided for item, an empty document will be used for the context. If expression or returnType is null, then a NullPointerException is thrown.
@param expression The XPath expression. @param item The starting context (node or node list, for example). @param returnType The desired return type. @return Result of evaluating an XPath expression as an Object of returnType. @throws XPathExpressionException If expression cannot be evaluated. @throws IllegalArgumentException If returnType is not one of the types defined in {@link XPathConstants}. @throws NullPointerException If expression or returnType is null.


    // Now the XPath expression
    try {
      XPathFactory xpathFact = XPathFactory.newInstance();
      XPath xpath = xpathFact.newXPath();
      Boolean result = (Boolean) xpath.evaluate(booleanExpression, booleanExpression, XPathConstants.BOOLEAN);


      /*
       * Set control port to make execution flow continue according to
       * condition
       */

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    private static NodeList queryNodes(Document metadata, String xpathQuery) {
        try {
            XPath xpath = XPATH_FACTORY.newXPath();
            xpath.setNamespaceContext(NAMESPACE_CONTEXT);
            return (NodeList) xpath.evaluate(xpathQuery, metadata, XPathConstants.NODESET);
        } catch (XPathExpressionException ex) {
            throw new RuntimeException("Error evaluating XPath: " + xpathQuery, ex);
        }
    }

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    private static Node queryNode(Document metadata, String xpathQuery) {
        try {
            XPath xpath = XPATH_FACTORY.newXPath();
            xpath.setNamespaceContext(NAMESPACE_CONTEXT);
            return (Node) xpath.evaluate(xpathQuery, metadata, XPathConstants.NODE);
        } catch (XPathExpressionException ex) {
            throw new RuntimeException("Error evaluating XPath: " + xpathQuery, ex);
        }
    }

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            }
            else {
                throw new IllegalArgumentException("Invalid parameter type [" + parameterTypes[i] + "]. " +
                        "Supported are: Boolean, Double, Node, NodeList, and String.");
            }
            args[i] = xpath.evaluate(expression, payloadElement, conversionType);
        }
        return args;
    }


    private synchronized XPath createXPath() {

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        XPath xpath = createXPath();
        xpath.setNamespaceContext(NamespaceUtils.getNamespaceContext(parameter.getMethod()));


        Element rootElement = getRootElement(messageContext.getRequest().getPayloadSource());
        String expression = parameter.getParameterAnnotation(XPathParam.class).value();
        Object result = xpath.evaluate(expression, rootElement, evaluationReturnType);
        return useConversionService ? conversionService.convert(result, parameterType) : result;
    }


    private QName getReturnType(Class<?> parameterType) {
        if (Boolean.class.equals(parameterType) || Boolean.TYPE.equals(parameterType)) {

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            throws ServletException, IOException {


        try {
            XPath xpath = XPathFactory.newInstance().newXPath();


            String result = xpath.evaluate("/content/name", new InputSource(new StringReader(XML_INPUT)));


            response.setContentType("text/plain");
            response.getWriter().write(result);
        } catch (XPathExpressionException e) {
            throw new ServletException(e.getMessage(), e);

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    public NodeList getByXpath(String xpath) throws ParsingException {
        XPath path = XPathFactory.newInstance().newXPath();
        NodeList childNodes;
        try {
            childNodes = (NodeList) path.evaluate(xpath, xmlDocument, XPathConstants.NODESET);
        } catch (XPathExpressionException e) {
            throw new ParsingException("Error evaluate xpath", e);
        }
        return childNodes;
    }

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                List<Node> nodeSet = new ArrayList<Node>();


                for (int i = 0; i < childNodes.getLength(); i++) {
                    Node node = childNodes.item(i).cloneNode(true);


                    String key = serializeNodes((NodeList) path.evaluate(keyXPath, node, XPathConstants.NODESET));
                    if (!keySet.contains(key)) {
                        keySet.add(key);
                        nodeSet.add(node);
                    }
                }

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      // in the current case though, the stream is valid so we wont load the resource by name
      Config schemaConf = new Config(loader, "schema", is, "/schema/");
      Document document = schemaConf.getDocument();
      final XPath xpath = schemaConf.getXPath();
      final List<SchemaAware> schemaAware = new ArrayList<SchemaAware>();
      Node nd = (Node) xpath.evaluate("/schema/@name", document, XPathConstants.NODE);
      if (nd==null) {
        log.warn("schema has no name!");
      } else {
        name = nd.getNodeValue();
        log.info("Schema name=" + name);

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        {
          FieldType ft = (FieldType)loader.newInstance(className);
          ft.setTypeName(name);


          String expression = "./analyzer[@type='query']";
          Node anode = (Node)xpath.evaluate(expression, node, XPathConstants.NODE);
          Analyzer queryAnalyzer = readAnalyzer(anode);


          // An analyzer without a type specified, or with type="index"
          expression = "./analyzer[not(@type)] | ./analyzer[@type='index']";
          anode = (Node)xpath.evaluate(expression, node, XPathConstants.NODE);

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