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

javax.xml.xpath.XPathExpression.evaluate()

Evaluate the compiled 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}, then an IllegalArgumentException is thrown.

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

            try {
                exp = XmlSignatureHelper.getXPathExpression(xp);
            } catch (XPathExpressionException e) {
                throw new XmlSignatureException("The parent XPath " + getConfiguration().getParentXpath().getXPath() + " is wrongly configured: The XPath " + xp.getXPath() + " is invalid.", e);
            }
            NodeList list = (NodeList) exp.evaluate(doc.getDocumentElement(), XPathConstants.NODESET);
            if (list == null || list.getLength() == 0) {
                throw new XmlSignatureException("The parent XPath " + xp.getXPath() + " returned no result. Check the configuration of the XML signer component.");
            }
            int length = list.getLength();
            for (int i = 0; i < length; i++) {

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            try {
                exp = XmlSignatureHelper.getXPathExpression(xp);
            } catch (XPathExpressionException e) {
                throw new XmlSignatureException("The configured xpath expression " + xp.getXPath() + " is invalid.", e);
            }
            NodeList list = (NodeList) exp.evaluate(messageBodyNode, XPathConstants.NODESET);
            if (list == null) {
                //assume optional element, XSD validation has been done before
                LOG.warn("No ID attribute found for xpath expression {}. Therfore this xpath expression will be ignored.", xp.getXPath());
                continue;
            }

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                return prefix2Namespace.get(prefix);
            }
        };
        xpath.setNamespaceContext(nc);
        XPathExpression expr = xpath.compile(xpathString);
        Object result = expr.evaluate(XmlSignatureHelper.newDocumentBuilder(true).parse(body), XPathConstants.NODE);
        assertNotNull("The xpath " + xpathString + " returned a null value", result);
        return result;
    }


    private Message getMessage(MockEndpoint mock) {

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            public String getNamespaceURI(String prefix) {
                switch (prefix) {
                    case "scr":
                        try {
                            XPathExpression scrNamespace = xPath.compile("/*/namespace::*[name()='scr']");
                            Node node = (Node) scrNamespace.evaluate(dom, XPathConstants.NODE);
                            return node.getNodeValue();
                        } catch (XPathExpressionException e) {
                            // ignore
                            LOG.debug("Error evaluating xpath to obtain namespace prefix. This exception is ignored and using namespace: http://www.osgi.org/xmlns/scr/v1.1.0", e);

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        XPathExpression propertyName = xPath.compile("@name");
        XPathExpression propertyValue = xPath.compile("@value");
        NodeList nodes = (NodeList) propertyList.evaluate(dom, XPathConstants.NODESET);
        for (int i = 0; i < nodes.getLength(); i++) {
            Node node = nodes.item(i);
            result.put((String) propertyName.evaluate(node, XPathConstants.STRING), (String) propertyValue.evaluate(node, XPathConstants.STRING));
        }
        return result;
    }


    private static Document readXML(File xml) throws Exception {

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      try {
        XPathFactory xPathfactory = XPathFactory.newInstance();
        XPath xpath = xPathfactory.newXPath();
        XPathExpression expr = xpath
            .compile("/response/lst[@name='status']/lst/date[@name='startTime']/text()");
        return (String) expr.evaluate(dom, XPathConstants.STRING);
      } catch (XPathExpressionException e) {
        throw new OpsException("Error reading value from XML", e);
      }
    }
  }

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    XPath xpath = factory.newXPath();
    Object result;
    try {
      XPathExpression expr =
        xpath.compile("/stratcon/database/dbconfig/" + param + "/text()");
      result = expr.evaluate(doc, XPathConstants.NODESET);
    }
    catch(XPathExpressionException e) {
      System.err.println("Bad expression: " + e.getMessage());
      return null;
    }

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    XPath xpath = factory.newXPath();
    Object result;
    try {
      XPathExpression expr =
        xpath.compile("/stratcon/iep/broker/@adapter");
      result = expr.evaluate(doc, XPathConstants.NODESET);
    }
    catch(XPathExpressionException e) {
      System.err.println("Bad expression: " + e.getMessage());
      return null;
    }

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    XPath xpath = factory.newXPath();
    Object result;
    try {
      XPathExpression expr =
        xpath.compile("/stratcon/iep/mq/@type");
      result = expr.evaluate(doc, XPathConstants.NODESET);
    }
    catch(XPathExpressionException e) {
      System.err.println("Bad expression: " + e.getMessage());
      return null;
    }

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    XPath xpath = factory.newXPath();
    Object result;
    try {
      XPathExpression expr =
        xpath.compile("/stratcon/iep/" + which + "/" + param + "/text()");
      result = expr.evaluate(doc, XPathConstants.NODESET);
    }
    catch(XPathExpressionException e) {
      System.err.println("Bad expression: " + e.getMessage());
      return null;
    }

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