Example usage for javax.xml.xpath XPathFactory newInstance

Introduction

In this page you can find the example usage for javax.xml.xpath XPathFactory newInstance.

Prototype

public static XPathFactory newInstance()

Source Link

Document

Get a new XPathFactory instance using the default object model, #DEFAULT_OBJECT_MODEL_URI , the W3C DOM.

This method is functionally equivalent to:

 newInstance(DEFAULT_OBJECT_MODEL_URI)

Since the implementation for the W3C DOM is always available, this method will never fail.

Usage

From source file:Main.java

/**
 * Select only one node what matches given xpath query
 *
 * @param doc        xml document//from w  ww  . ja v a 2 s.  co  m
 * @param expression xpath query
 * @return first element which confirms given xpath query.
 * @throws XPathExpressionException in case of any errors.
 */
public static Element queryElement(final Document doc, final String expression)
        throws XPathExpressionException {
    final XPath xpath = XPathFactory.newInstance().newXPath();
    return (Element) xpath.evaluate(expression, doc, XPathConstants.NODE);
}

From source file:Main.java

/**
 * Performs a xpath query on a document and returns the matching nodelist.
 *
 * @param doc/*w ww.ja  v a 2 s .c  o  m*/
 * @param xpathQuery
 * @return nodelist of matches
 * @throws Exception
 */
public static NodeList query(Document doc, String xpathQuery) throws Exception {
    NodeList result = null;
    // prepare XPath
    XPath xpath = XPathFactory.newInstance().newXPath();

    try {
        // query xml
        result = (NodeList) xpath.evaluate(xpathQuery, doc, XPathConstants.NODESET);
    } catch (XPathExpressionException xpx) {
        throw new Exception("Error evaluating XPath: " + xpx.getMessage(), xpx);
    }
    return result;
}

From source file:Main.java

@GuardedBy("xpathFactoryLock")
public static XPath createNewXPathInstance() {
    XPathFactory factory = null;/* w  ww .j  av a 2s  . c  o m*/

    xpathFactoryLock.lock();
    try {
        factory = XPathFactory.newInstance();
    } finally {
        xpathFactoryLock.unlock();
    }

    return factory.newXPath();
}

From source file:Main.java

public final static XPath getNewXPath() {
    return XPathFactory.newInstance().newXPath();
}

From source file:Main.java

public static NodeList getValueAsNodes(String filePath, String value)
        throws ParserConfigurationException, SAXException, IOException {
    NodeList nodeList = null;/*from  ww  w  . j  a  va  2  s  . c om*/
    XPathFactory xpathFactory = XPathFactory.newInstance();
    XPath xpath = xpathFactory.newXPath();
    try {
        XPathExpression expr = xpath.compile(value);
        nodeList = (NodeList) expr.evaluate(getDoc(filePath), XPathConstants.NODESET);
    } catch (XPathExpressionException e) {
        e.printStackTrace();
    }

    return nodeList;
}

From source file:Main.java

public static String getAttribute(String fileName, String xPathExpression, String attributeName) {
    try {//from w  w w.  ja  v a2  s  .c  om
        Document document = parseXML(new File(fileName));
        XPath xpath = XPathFactory.newInstance().newXPath();
        XPathExpression xpathExpression = xpath.compile(xPathExpression);
        Node node = (Node) xpathExpression.evaluate(document, NODE);
        return getAttributeValueByName(node, attributeName);
    } catch (Exception e) {
        throw new RuntimeException("Failed to extract element from:" + fileName, e);
    }
}

From source file:Main.java

public static NodeList getNodeList(Node node, String xPathAsString) throws XPathExpressionException {
    XPath xpath = XPathFactory.newInstance().newXPath();
    XPathExpression expr = xpath.compile(xPathAsString);
    return (NodeList) expr.evaluate(node, XPathConstants.NODESET);
}

From source file:Main.java

/**
 * @param node  An XML DOM Tree for query
 * @param query An XPATH query to run against the DOM Tree
 * @param nc    The namespaceContext that maps prefixes to XML namespace
 * @return A list of nodes that result from running the query against
 *         the node.//from  w  w  w .  j a  va  2s.com
 * @throws Exception If anything goes wrong. No error handling for brevity
 */
public static NodeList query(Node node, String query, NamespaceContext nc) throws Exception {
    XPathFactory xpf = XPathFactory.newInstance();
    XPath xpath = xpf.newXPath();
    xpath.setNamespaceContext(nc);
    return (NodeList) xpath.evaluate(query, node, XPathConstants.NODESET);
}

From source file:Main.java

/**
 * Gets the XPath factory, creating it if necessary.
 * /*ww w  . j a  v  a 2  s. c  om*/
 * @return the XPath factory.
 */
public static synchronized XPathFactory getXPathFactory() {
    if (xpathFactory == null) {
        xpathFactory = XPathFactory.newInstance();
    }
    return xpathFactory;
}

From source file:Main.java

public static XPathFactory getXPathFactory() {
    return XPathFactory.newInstance();
}