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

/**
 * Creates an XPATH instance for querying with
 * //from w  w  w  .  j av a  2 s.c  om
 * @return an XPATH instance
 */
public static XPath createXPath() {
    return XPathFactory.newInstance().newXPath();
}

From source file:Main.java

public static String toPrettyString(String xml) {
    int indent = 4;
    try {/* www . j  a  v  a  2 s. c om*/
        // Turn xml string into a document
        Document document = DocumentBuilderFactory.newInstance().newDocumentBuilder()
                .parse(new InputSource(new ByteArrayInputStream(xml.getBytes("utf-8"))));

        // Remove whitespaces outside tags
        XPath xPath = XPathFactory.newInstance().newXPath();
        NodeList nodeList = (NodeList) xPath.evaluate("//text()[normalize-space()='']", document,
                XPathConstants.NODESET);

        for (int i = 0; i < nodeList.getLength(); ++i) {
            Node node = nodeList.item(i);
            node.getParentNode().removeChild(node);
        }

        // Setup pretty print options
        TransformerFactory transformerFactory = TransformerFactory.newInstance();
        transformerFactory.setAttribute("indent-number", indent);
        Transformer transformer = transformerFactory.newTransformer();
        transformer.setOutputProperty(OutputKeys.ENCODING, "UTF-8");
        transformer.setOutputProperty(OutputKeys.OMIT_XML_DECLARATION, "no");
        transformer.setOutputProperty(OutputKeys.INDENT, "yes");
        transformer.setOutputProperty(OutputKeys.METHOD, "xml");

        // Return pretty print xml string
        StringWriter stringWriter = new StringWriter();
        transformer.transform(new DOMSource(document), new StreamResult(stringWriter));
        return stringWriter.toString();
    } catch (Exception e) {
        System.out.println(xml);
        throw new RuntimeException(
                "Problems prettyfing xml content [" + Splitter.fixedLength(100).split(xml) + "]", e);
    }
}

From source file:Main.java

private static XPath createXPath(NamespaceContext namespaceContext, XPathFunctionResolver functionResolver) {
    XPath xPath = XPathFactory.newInstance().newXPath();
    if (namespaceContext != null) {
        xPath.setNamespaceContext(namespaceContext);
    }//from   www.  j  a v  a  2  s  .  c om
    if (functionResolver != null) {
        xPath.setXPathFunctionResolver(functionResolver);
    }
    return xPath;
}

From source file:Main.java

/**
 * Counts the elements which results from the xpath expression.
 * /*from w w  w.  jav  a 2s .c  o  m*/
 * @param document the xml document.
 * @param xpath the expression
 * @param message The assert message.
 * @return Returns -1 if no element was found.
 */
public static int count(String message, Document document, String xpath) throws XPathExpressionException {
    XPathExpression expression = EXPRESSIONS.get(xpath);
    NodeList list = null;

    if (expression == null) {
        expression = XPathFactory.newInstance().newXPath().compile(xpath);
        EXPRESSIONS.put(xpath, expression);
    }

    if ((list = (NodeList) expression.evaluate(document.getDocumentElement(),
            XPathConstants.NODESET)) != null) {
        return list.getLength();
    }

    return -1;
}

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 ww w .ja v  a2  s.co  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

/**
 * Performs a xpath query on a document and returns the matching nodelist.
 *
 * @param context the Context where to start with the query
 * @param query the XPath-Query//from w ww.  ja v  a  2s.  co  m
 * @return nodelist of matches
 * @throws Exception on error
 */
public static NodeList query(Node context, String query) throws Exception {
    NodeList result = null;
    XPath xpath = XPathFactory.newInstance().newXPath();

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

From source file:Main.java

/**
 * Extract the parameters specified in the XML document for the Element
 * specified by parent./*  ww w .  j ava  2 s  .c o m*/
 * 
 * @param parent
 *            - Parent Node.
 * @return
 * @throws Exception
 */
public static HashMap<String, Object> parseParams(Element parent) throws Exception {
    XPath xpath = XPathFactory.newInstance().newXPath();
    // XPath Query for showing all nodes value
    XPathExpression expr = xpath.compile(_PARAM_NODE_PARAMS_);

    NodeList nodes = (NodeList) expr.evaluate(parent, XPathConstants.NODESET);
    if (nodes != null && nodes.getLength() > 0) {
        HashMap<String, Object> params = new HashMap<String, Object>();
        for (int ii = 0; ii < nodes.getLength(); ii++) {
            Element elm = (Element) nodes.item(ii);
            String name = elm.getAttribute(_PARAM_ATTR_NAME_);
            String value = elm.getAttribute(_PARAM_ATTR_VALUE_);
            if (name != null && !name.isEmpty()) {
                params.put(name, value);
            }
        }
        return params;
    }
    return null;
}

From source file:Main.java

public static Object executeXPath(Document dom, String xpath, QName returnType)
        throws XPathExpressionException {
    XPathExpression expr = XPathFactory.newInstance().newXPath().compile(xpath);
    return expr.evaluate(dom, returnType);
}

From source file:Main.java

public static synchronized String evaluate(String path, Node node) throws RuntimeException {
    path = path.trim();/*from  www .jav a 2  s. c  o m*/
    try {
        XPath xp = XPathFactory.newInstance().newXPath();
        XPathExpression expr = xp.compile(path);
        String ret = expr.evaluate(node);

        return ret;

    } catch (Exception ex) {
        throw new RuntimeException(ex);
    }
}

From source file:com.github.born2snipe.project.setup.cli.maven.AssertXml.java

public static void assertTextAt(String expectedText, File file, String xpathQuery) {
    try {/*w  w w  .  java  2 s .  com*/
        DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
        DocumentBuilder builder = factory.newDocumentBuilder();
        Document doc = builder.parse(file);

        XPath xPath = XPathFactory.newInstance().newXPath();
        String text = xPath.compile(xpathQuery).evaluate(doc);
        assertEquals("Text @ " + xpathQuery, expectedText, text);
    } catch (Exception e) {
        throw new RuntimeException(e);
    }
}