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.

        try {
            TidyMarkupDataFormat dataFormat = new TidyMarkupDataFormat();
            dataFormat.setMethod("html");
            Node doc = dataFormat.asNodeTidyMarkup(IOHelper.buffered(url.openStream()));
            XPath xpath = XPathFactory.newInstance().newXPath();
            Node nd = (Node)xpath.evaluate("//div[@class='" + contentDivClass + "']", doc, XPathConstants.NODE);
            if (nd != null) {
                return  new XmlConverter().toString(nd, null);
            }
        } catch (Throwable e) {
            if (errorOnDownloadFailure) {

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                    if (namespaces != null) {
                        xpath.setNamespaceContext(new MapNamespaceContext(namespaces));
                    }
                    NodeList list;
                    try {
                        list = (NodeList)xpath.evaluate(expression, 
                                                                 header,
                                                                 XPathConstants.NODESET);
                        if (list.getLength() == 0) {
                            ai.setNotAsserted("No header element matching XPath " + expression + " found.");
                            return false;

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     * @throws XPathExpressionException if the xpath query could not be executed
     */
    private boolean isCallSuccessful(String xmlResponse) throws XPathExpressionException {
        final XPath xpath = XPathFactory.newInstance().newXPath();


        final String exitCode = xpath.evaluate("/map/entry[@key = 'exit_code']/@value",
                new InputSource(new StringReader(xmlResponse)));


        return !(exitCode == null || !SUCCESS.equals(exitCode));


    }

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     * @return true if call was successful, false otherwise
     * @throws XPathExpressionException if the xpath query could not be executed
     */
    private String getMessage(String xmlResponse) throws XPathExpressionException {
        final XPath xpath = XPathFactory.newInstance().newXPath();
        return xpath.evaluate("/map/entry[@key = 'message']/@value", new InputSource(new StringReader(xmlResponse)));
    }


    private ProtocolMetaData parseForProtocolMetaData(String xmlResponse) throws XPathExpressionException {
        final ProtocolMetaData protocolMetaData = new ProtocolMetaData();
        final HTTPContext httpContext = new HTTPContext(this.configuration.getRemoteServerAddress(),

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        final HTTPContext httpContext = new HTTPContext(this.configuration.getRemoteServerAddress(),
                this.configuration.getRemoteServerHttpPort());


        final XPath xpath = XPathFactory.newInstance().newXPath();


        NodeList servlets = (NodeList) xpath.evaluate("/map/entry[@key = 'properties']/map/entry[@value = 'Servlet']",
                new InputSource(new StringReader(xmlResponse)), XPathConstants.NODESET);


        for (int i = 0; i < servlets.getLength(); i++) {
            httpContext.add(new Servlet(servlets.item(i).getAttributes().getNamedItem("key").getNodeValue(), this.deploymentName));
        }

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      XPath xpath = XPathFactory.newInstance().newXPath();
      SimpleNamespaceContext nsContext = new SimpleNamespaceContext();
      nsContext.registerMapping("ad", archetypeDescriptorUri);
      xpath.setNamespaceContext(nsContext);


      NodeList properties = (NodeList) xpath.evaluate(requiredPropertyXPath, document, XPathConstants.NODESET);


      for (int p = 0; p < properties.getLength(); p++)
      {
         Element requiredProperty = (Element) properties.item(p);

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  private static Element getTemplateRootNode(Document templateNode, String templateFragment) {
    try {
      XPath xpath = XPathFactory.newInstance().newXPath();
      Element documentElement = templateNode.getDocumentElement();
      if (templateFragment == null || templateFragment.trim().length() == 0) {
        return (Element) xpath.evaluate("//body", documentElement, XPathConstants.NODE);
      }
      else {
        return (Element) xpath.evaluate("//*[@data-field='" + templateFragment + "']", documentElement,
            XPathConstants.NODE);
      }

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      Element documentElement = templateNode.getDocumentElement();
      if (templateFragment == null || templateFragment.trim().length() == 0) {
        return (Element) xpath.evaluate("//body", documentElement, XPathConstants.NODE);
      }
      else {
        return (Element) xpath.evaluate("//*[@data-field='" + templateFragment + "']", documentElement,
            XPathConstants.NODE);
      }
    }
    catch (XPathExpressionException e) {
      return null;

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        XPath xpath = XPATH_FACTORY.newXPath();
        xpath.setNamespaceContext(jstlXPathNamespaceContext);
        xpath.setXPathVariableResolver(jxvr);
        try {
            return xpath.evaluate(xpathString, contextNode);
        } catch (XPathExpressionException ex) {
            throw new JspTagException(ex.toString(), ex);
        }
    }

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        XPath xpath = XPATH_FACTORY.newXPath();
        xpath.setNamespaceContext(jstlXPathNamespaceContext);
        xpath.setXPathVariableResolver(jxvr);
        try {
            return ((Boolean) xpath.evaluate(
              xpathString, contextNode, XPathConstants.BOOLEAN)).booleanValue();
        } catch (XPathExpressionException ex) {
            throw new JspTagException(
                Resources.getMessage("XPATH_ERROR_XOBJECT", ex.toString()), ex);            
        }

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