Example usage for org.w3c.dom.xpath XPathResult UNORDERED_NODE_ITERATOR_TYPE

Introduction

In this page you can find the example usage for org.w3c.dom.xpath XPathResult UNORDERED_NODE_ITERATOR_TYPE.

Prototype

short UNORDERED_NODE_ITERATOR_TYPE

To view the source code for org.w3c.dom.xpath XPathResult UNORDERED_NODE_ITERATOR_TYPE.

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Document

The result is a node set as defined by that will be accessed iteratively, which may not produce nodes in a particular order.

Usage

From source file:ApplyXPathDOM.java

/** Process input args and execute the XPath.  */
public void doMain(String[] args) throws Exception {
    filename = args[0];/*w ww. j a  v  a 2 s.  co m*/
    xpath = args[1];

    if ((filename != null) && (filename.length() > 0) && (xpath != null) && (xpath.length() > 0)) {
        // Tell that we're loading classes and parsing, so the time it 
        // takes to do this doesn't get confused with the time to do 
        // the actual query and serialization.
        System.out.println("Loading classes, parsing " + filename + ", and setting up serializer");

        // Set up a DOM tree to query.
        InputSource in = new InputSource(new FileInputStream(filename));
        DocumentBuilderFactory dfactory = DocumentBuilderFactory.newInstance();
        dfactory.setNamespaceAware(true);
        Document doc = dfactory.newDocumentBuilder().parse(in);

        // Set up an identity transformer to use as serializer.
        Transformer serializer = TransformerFactory.newInstance().newTransformer();
        serializer.setOutputProperty(OutputKeys.OMIT_XML_DECLARATION, "yes");

        // Use the DOM L3 XPath API to apply the xpath expression to the doc.
        System.out.println("Querying DOM using " + xpath);

        // Create an XPath evaluator and pass in the document.
        XPathEvaluator evaluator = new XPathEvaluatorImpl(doc);
        XPathNSResolver resolver = evaluator.createNSResolver(doc);

        // Evaluate the xpath expression
        XPathResult result = (XPathResult) evaluator.evaluate(xpath, doc, resolver,
                XPathResult.UNORDERED_NODE_ITERATOR_TYPE, null);

        // Serialize the found nodes to System.out.
        System.out.println("<output>");

        Node n;
        while ((n = result.iterateNext()) != null) {
            if (isTextNode(n)) {
                // DOM may have more than one node corresponding to a 
                // single XPath text node.  Coalesce all contiguous text nodes
                // at this level
                StringBuffer sb = new StringBuffer(n.getNodeValue());
                for (Node nn = n.getNextSibling(); isTextNode(nn); nn = nn.getNextSibling()) {
                    sb.append(nn.getNodeValue());
                }
                System.out.print(sb);
            } else {
                serializer.transform(new DOMSource(n), new StreamResult(new OutputStreamWriter(System.out)));
            }
            System.out.println();
        }
        System.out.println("</output>");
    } else {
        System.out.println("Bad input args: " + filename + ", " + xpath);
    }
}

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