Example usage for javax.xml.xpath XPathExpression evaluate

List of usage examples for javax.xml.xpath XPathExpression evaluate

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Introduction

In this page you can find the example usage for javax.xml.xpath XPathExpression evaluate.

Prototype

public Object evaluate(InputSource source, QName returnType) throws XPathExpressionException;

Source Link

Document

Evaluate the compiled XPath expression in the context of the specified InputSource and return the result as the specified type.

Usage

From source file:Main.java

/** Evaluates an XPath. */
private static synchronized Object evalXPath(String expression, Object item, QName type) {
    if (xPath == null)
        xPath = XPathFactory.newInstance().newXPath();

    try {/*from   w  w  w.  j ava  2s . c o m*/
        XPathExpression exp = xPath.compile(expression);
        Object node = exp.evaluate(item, XPathConstants.NODE);

        return (node == null) ? null : exp.evaluate(item, type);
    } catch (XPathExpressionException e) {
        throw new AssertionError("Error initializing XPath instance for '" + expression + "': " + e);
    }
}

From source file:Main.java

public static String getProcessIdFromBpmn(final String bpmn) {
    String processId = null;/*  w w w .  j  a  v  a2 s .c o  m*/
    try {
        final DocumentBuilderFactory domFactory = DocumentBuilderFactory.newInstance();
        domFactory.setNamespaceAware(true);
        final Document doc = domFactory.newDocumentBuilder()
                .parse(new ByteArrayInputStream(bpmn.getBytes("UTF-8")));
        final XPath xpath = XPathFactory.newInstance().newXPath();
        xpath.setNamespaceContext(new NamespaceContext() {
            @Override
            public Iterator<?> getPrefixes(final String namespaceURI) {
                // Not used in this context.
                return null;
            }

            @Override
            public String getPrefix(final String namespaceURI) {
                // Not used in this context.
                return null;
            }

            @Override
            public String getNamespaceURI(final String prefix) {
                // Only require the URI for the bpmn2 NS.
                return BPMN2_NAMESPACE_URI;
            }
        });
        final XPathExpression expr = xpath.compile(BPMN_PROCESS_ID_XPATH_EXPR);

        final Node node = (Node) expr.evaluate(doc, XPathConstants.NODE);
        processId = node.getAttributes().getNamedItem(BPMN_PROCESS_ID_ATTR).getNodeValue();
    } catch (final Exception e) {
        e.printStackTrace();
    }
    return processId;
}

From source file:Main.java

/**
 * Evaluates the XPath expression in the specified context and returns the found items as a List.
 *
 * @param node       the XML document to evaluate
 * @param expression the compiled XPath expression
 * @return the list of elements found/*from w  ww  .  j  av a 2  s .c  o  m*/
 */
public static List<String> getListValue(Node node, XPathExpression expression) {
    try {
        NodeList nodeList = (NodeList) expression.evaluate(node, XPathConstants.NODESET);
        List<String> list = new ArrayList<String>(nodeList.getLength());
        for (int i = 0; i < nodeList.getLength(); i++) {
            Node item = nodeList.item(i);
            list.add(item.getFirstChild().getNodeValue());
        }
        return list;
    } catch (XPathExpressionException e) {
        // Try to evaluate in string context:
        String value = getStringValue(node, expression);
        if (value != null) {
            List<String> list = new ArrayList<String>(1);
            list.add(value);
            return list;
        }
        return Collections.emptyList();
    }
}

From source file:Main.java

/**
 * Get xml nodes by xpath expression//from   ww w .j  a  va 2  s. c  o m
 * 
 * @param doc
 * @param expr
 * @return
 * @throws Exception
 */
public static NodeList getNodesByXPath(Document doc, XPathExpression expr) throws Exception {
    return (NodeList) expr.evaluate(doc, XPathConstants.NODESET);
}

From source file:Main.java

/**
 * Get xml nodes by xpath expression, based on node
 * /*from   ww  w  .  j  av  a 2 s.c  om*/
 * @param node
 * @param xpath
 * @return
 * @throws Exception
 */
public static NodeList getNodesByXPath(Node node, XPathExpression xpath) throws Exception {
    return (NodeList) xpath.evaluate(node, XPathConstants.NODESET);
}

From source file:Main.java

private static List<String> getFemaleEmployeesName(Document doc, XPath xpath) throws Exception {
    List<String> list = new ArrayList<>();
    XPathExpression expr = xpath.compile("/Employees/Employee[gender='Female']/name/text()");
    // evaluate expression result on XML document
    NodeList nodes = (NodeList) expr.evaluate(doc, XPathConstants.NODESET);
    for (int i = 0; i < nodes.getLength(); i++)
        list.add(nodes.item(i).getNodeValue());
    return list;//from  w w  w .  j a  v a2  s  . c o m
}

From source file:Main.java

/**
 * Read application-context file, and return fully qualified class name for
 * given <code>beanName</code>
 * //from  ww w .  j av  a 2s  .  c om
 * @param beanName
 * @return
 * 
 */
public static String getFullyQualifiedClass(String beanName) {

    DocumentBuilderFactory docBuilderFactory = DocumentBuilderFactory.newInstance();

    docBuilderFactory.setNamespaceAware(true);

    String nodeValue = "";

    try {
        DocumentBuilder builder = docBuilderFactory.newDocumentBuilder();
        Document doc = builder.parse("application-context.xml");

        XPathFactory factory = XPathFactory.newInstance();
        XPath xpath = factory.newXPath();
        XPathExpression expr = xpath.compile("//bean[@name='" + beanName + "']/@class");

        Object result = expr.evaluate(doc, XPathConstants.NODESET);

        NodeList nodes = (NodeList) result;
        if (nodes.getLength() > 0) {
            nodeValue = nodes.item(0).getNodeValue();
        }
    } catch (ParserConfigurationException parserConfigurationException) {
        parserConfigurationException.printStackTrace();
    } catch (IOException ioException) {
        ioException.printStackTrace();
    } catch (SAXException saxException) {
        saxException.printStackTrace();
    } catch (XPathExpressionException xPathExpressionException) {
        xPathExpressionException.printStackTrace();
    }

    return nodeValue;
}

From source file:Main.java

public static String setValueXPath(String srcXmlString, String xPath, String newVal) {
    DocumentBuilderFactory domFactory = DocumentBuilderFactory.newInstance();
    domFactory.setNamespaceAware(false); // never forget this!
    int i, j;/*from  w ww  .j  a v  a 2s  .c  om*/
    Document doc = null;
    DocumentBuilder builder = null;
    try {
        builder = domFactory.newDocumentBuilder();
        doc = builder.parse(new ByteArrayInputStream(srcXmlString.getBytes()));
        XPathFactory factory = XPathFactory.newInstance();
        XPath xpath = factory.newXPath();
        XPathExpression expr = xpath.compile(xPath);

        Object result = expr.evaluate(doc, XPathConstants.NODESET);

        NodeList xPathNodes = (NodeList) result;
        logger.debug("xpath result count: " + xPathNodes.getLength());
        logger.debug(xPathNodes.item(0).getNodeName() + " = " + xPathNodes.item(0).getTextContent());

        // get list of all nodes in doc
        NodeList nodes = doc.getElementsByTagName("*");
        // iterate through all the nodes
        for (i = 0; i < xPathNodes.getLength(); i++) {
            // for each node in xpath result - traverse through all nodes in
            // doc to find match
            for (j = 0; j < nodes.getLength(); j++) {
                if (nodes.item(j).isSameNode(xPathNodes.item(i))) {
                    logger.debug("Old value " + i + ": " + xPathNodes.item(i).getNodeName() + " = "
                            + xPathNodes.item(i).getTextContent());
                    nodes.item(j).setTextContent(newVal);
                    logger.debug("New value " + i + ": " + xPathNodes.item(i).getNodeName() + " = "
                            + xPathNodes.item(i).getTextContent());
                    break;
                }
            }
        }
    } catch (Exception ex) {
        logger.error(ex.getMessage());
        // ex.printStackTrace();
    }
    return getW3CXmlFromDoc(doc);
}

From source file:Main.java

/**
 * Gets the node list from the given xml file and the given xpath expression.
 * //from   w w w. j av a  2  s .  c o  m
 * @param xml
 *            the xml
 * @param xpathExpression
 *            the xpath expression
 * @return the node list
 * @throws XPathExpressionException
 *             the x path expression exception
 * @throws ParserConfigurationException
 *             the parser configuration exception
 * @throws SAXException
 *             the sAX exception
 * @throws IOException
 *             Signals that an I/O exception has occurred.
 */
public static NodeList getNodeList(final File xml, final String xpathExpression)
        throws XPathExpressionException, ParserConfigurationException, SAXException, IOException {
    final DocumentBuilderFactory domFactory = DocumentBuilderFactory.newInstance();
    domFactory.setNamespaceAware(true);
    final DocumentBuilder builder = domFactory.newDocumentBuilder();
    final Document doc = builder.parse(xml);
    final XPath xpath = XPathFactory.newInstance().newXPath();
    final XPathExpression expr = xpath.compile(xpathExpression);

    final Object result = expr.evaluate(doc, XPathConstants.NODESET);
    final NodeList nodes = (NodeList) result;
    return nodes;
}

From source file:Main.java

/**
 * Gets the node list from the given xml file and the given xpath expression.
 * /*  w  ww. j  av a2s.c o  m*/
 * @param xml
 *            the xml file as string.
 * @param xpathExpression
 *            the xpath expression as string.
 * @return the node list
 * @throws XPathExpressionException
 *             the x path expression exception
 * @throws ParserConfigurationException
 *             the parser configuration exception
 * @throws SAXException
 *             the sAX exception
 * @throws IOException
 *             Signals that an I/O exception has occurred.
 */
public static NodeList getNodeList(final String xml, final String xpathExpression)
        throws XPathExpressionException, ParserConfigurationException, SAXException, IOException {
    final DocumentBuilderFactory domFactory = DocumentBuilderFactory.newInstance();
    domFactory.setNamespaceAware(true);
    final DocumentBuilder builder = domFactory.newDocumentBuilder();
    final Document doc = builder.parse(xml);
    final XPath xpath = XPathFactory.newInstance().newXPath();
    final XPathExpression expr = xpath.compile(xpathExpression);

    final Object result = expr.evaluate(doc, XPathConstants.NODESET);
    final NodeList nodes = (NodeList) result;
    return nodes;
}