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.

        if (target != null) {
            org.w3c.dom.Node parent = null;
                parent = ((org.w3c.dom.Node) target).getParentNode();
                
                
            targetElem = exprTo.evaluate(parent, XPathConstants.NODE);
            
            if (targetElem == null) {
                throw new RuntimeException("Nothing was selected by the to expression " + to + " on " + targetExpr);
            }
        }

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        resolver.declarePrefix(CATALONG_URI_PREFIX, CATALONG_URI);
        xpath.setNamespaceContext(resolver);
        final String count = "count(" + testPath + ")";
        XPathExpression expr = xpath.compile(count);
        final Document catalog = catalogPool.borrowObject();
        final Double d = (Double) expr.evaluate(catalog, XPathConstants.NUMBER);
        catalogPool.returnObject(catalog);
        return d.intValue();
    }


    public void invokeTest(final String testPath) throws Exception {

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        NamespaceBinder resolver = new NamespaceBinder();
        resolver.declarePrefix(XQTSTestBase.CATALONG_URI_PREFIX, XQTSTestBase.CATALONG_URI);
        xpath.setNamespaceContext(resolver);
        final String count = "count(" + testPath + ")";
        XPathExpression expr = xpath.compile(count);
        final Double d = (Double) expr.evaluate(catalog, XPathConstants.NUMBER);
        return d.intValue();
    }


    private static String toClassName(String name) {
        final StringBuilder buf = new StringBuilder(64);

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    throws XPathExpressionException
  {
    NodeList nodes = null;
    final String sXPath = "//" + nodeName;
    XPathExpression xPathExpression = getXPathExpression(sXPath);
    nodes = (NodeList) xPathExpression.evaluate(parent, XPathConstants.NODESET);
    List<Node> realNodeList = createRealNodeList(nodes);
    return realNodeList;
  }


  public Node getChild(Node parent, String nodeName)

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    throws XPathExpressionException
  {
    NodeList nodes = null;
    final String sXPath = nodeName;
    XPathExpression xPathExpression = getXPathExpression(sXPath);
    nodes = (NodeList) xPathExpression.evaluate(parent, XPathConstants.NODESET);
    List<Node> realNodeList = createRealNodeList(nodes);
    return realNodeList;
  }


  public List<Node> getChildren(Node parent)

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                    for (XmlSchema schema : schemas.getXmlSchemas()) {
                        if (XMLConstants.W3C_XML_SCHEMA_NS_URI.equals(schema.getTargetNamespace())) {
                            continue;
                        }
                        Object src = getSchemaNode(schema, schemas);
                        NodeList nodes = (NodeList)xpe.evaluate(src, XPathConstants.NODESET);
                        if (nodes.getLength() > 0) {
                            String key = schema.getSourceURI();
                            binding = convertToTmpInputSource(d.getDocumentElement(), key);
                            opts.addBindFile(binding);
                            binding = null;

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    private static String xpathGetText(Document doc, String expression) throws XPathExpressionException {
        XPathFactory xPathFactory = XPathFactory.newInstance();
        XPath xPath = xPathFactory.newXPath();
        XPathExpression expr = xPath.compile(expression);


        return (String) expr.evaluate(doc, XPathConstants.STRING);
    }


    /**
     * Select matching node set and extract specified attribute value.
     *

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    private static List<String> xpathGetAttributeValueList(Document doc, String expression, String attribute) throws XPathExpressionException {
        XPathFactory xPathFactory = XPathFactory.newInstance();
        XPath xPath = xPathFactory.newXPath();
        XPathExpression expr = xPath.compile(expression);


        NodeList nl = (NodeList) expr.evaluate(doc, XPathConstants.NODESET);


        List<String> attributeValues = new ArrayList<String>();


        for (int i = 0; i < nl.getLength(); i++) {
            attributeValues.add(((Element) nl.item(i)).getAttribute(attribute));

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        .newDocumentBuilder()
        .parse(new ByteArrayInputStream(c24.getXml().getBytes()));


    XPath xpath = XPathFactory.newInstance().newXPath();
    XPathExpression xpathExpression = xpath.compile("//transaction/value");
    String result = xpathExpression.evaluate(document).toLowerCase();
    
    return result.contains("valid");
  }


}

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    protected Node getOutputNodeViaXPath(Input input) throws Exception { //NOPMD
        checkSearchValueNotNull(input);
        checkSearchValueOfType(XPathFilterParameterSpec.class, input);
        XPathFilterParameterSpec xpathFilter = (XPathFilterParameterSpec) input.getOutputNodeSearch();
        XPathExpression expr = XmlSignatureHelper.getXPathExpression(xpathFilter);
        NodeList nodes = (NodeList) expr.evaluate(input.getMessageBodyDocument(), XPathConstants.NODESET);
        if (nodes == null || nodes.getLength() == 0) {
            throw new XmlSignatureException(
                    String.format(
                            "Cannot extract root node for the output document from the XML signature document. No node found for XPATH %s as specified in the output node search.",
                            xpathFilter.getXPath()));

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