Examples of org.w3c.dom.traversal.NodeIterator

org.w3c.dom.traversal.NodeIterator
NodeIterators are used to step through a set of nodes, e.g. the set of nodes in a NodeList, the document subtree governed by a particular node, the results of a query, or any other set of nodes. The set of nodes to be iterated is determined by the implementation of the NodeIterator. DOM Level 2 specifies a single NodeIterator implementation for document-order traversal of a document subtree. Instances of these iterators are created by calling DocumentTraversal.createNodeIterator(). @since DOM Level 2

          Node contextNode, String str, Node namespaceNode)
            throws TransformerException
  {


    // Have the XObject return its result as a NodeSetDTM.
    NodeIterator nl = selectNodeIterator(contextNode, str, namespaceNode);


    // Return the first node, or null
    return nl.nextNode();
  }

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  /**
   * Parses pipelined data out of a Document.
   */
  Map<PipelinedData, Node> parsePipelinedData(Gadget gadget, Document doc) {
    NodeIterator nodeIterator = ((DocumentTraversal) doc)
        .createNodeIterator(doc, NodeFilter.SHOW_ELEMENT,
            new NodeFilter() {
              public short acceptNode(Node n) {
                if ("script".equalsIgnoreCase(n.getNodeName()) &&
                    "text/os-data".equals(((Element) n).getAttribute("type"))) {
                  return NodeFilter.FILTER_ACCEPT;
                }
                return NodeFilter.FILTER_REJECT;
              }
            }, false);
    
    Map<PipelinedData, Node> pipelineNodes = Maps.newHashMap();
    for (Node n = nodeIterator.nextNode(); n != null ; n = nodeIterator.nextNode()) {
      try {
        PipelinedData pipelineData = new PipelinedData((Element) n, gadget.getSpec().getUrl());
        pipelineNodes.put(pipelineData, n);
      } catch (SpecParserException e) {
        // Leave the element to the client

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        if ( returnType.equals( XPathConstants.NODESET ) ) {
            return resultObject.nodelist();
        }
        // XPathConstants.NODE
        if ( returnType.equals( XPathConstants.NODE ) ) {
            NodeIterator ni = resultObject.nodeset();
            //Return the first node, or null
            return ni.nextNode();
        }
        // If isSupported check is already done then the execution path 
        // shouldn't come here. Being defensive
        String fmsg = XSLMessages.createXPATHMessage( 
                XPATHErrorResources.ER_UNSUPPORTED_RETURN_TYPE,

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        if ( returnType.equals( XPathConstants.NODESET ) ) { 
            return resultObject.nodelist();
        }
        // XPathConstants.NODE
        if ( returnType.equals( XPathConstants.NODE ) ) { 
            NodeIterator ni = resultObject.nodeset(); 
            //Return the first node, or null
            return ni.nextNode();
        }
        String fmsg = XSLMessages.createXPATHMessage(
                XPATHErrorResources.ER_UNSUPPORTED_RETURN_TYPE,
                new Object[] { returnType.toString()});
        throw new IllegalArgumentException( fmsg );

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        }
    }


    protected String textValueOfXPath(Node node, String xpath) throws TransformerException {
        CachedXPathAPI cachedXPathAPI = new CachedXPathAPI();
        NodeIterator iterator = cachedXPathAPI.selectNodeIterator(node, xpath);
        Node root = iterator.nextNode();
        if (root instanceof Element) {
            Element element = (Element) root;
            if (element == null) {
                return "";
            }

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        return 10;
    }
    
    protected String textValueOfXPath(Node node, String xpath) throws TransformerException {
        CachedXPathAPI cachedXPathAPI = new CachedXPathAPI();
        NodeIterator iterator = cachedXPathAPI.selectNodeIterator(node, xpath);
        Node root = iterator.nextNode();
        if (root instanceof Element) {
            Element element = (Element) root;
            if (element == null) {
                return "";
            }

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        Thread.sleep(100);
    }
    
    protected String textValueOfXPath(Node node, String xpath) throws TransformerException {
        CachedXPathAPI cachedXPathAPI = new CachedXPathAPI();
        NodeIterator iterator = cachedXPathAPI.selectNodeIterator(node, xpath);
        Node root = iterator.nextNode();
        if (root instanceof Element) {
            Element element = (Element) root;
            if (element == null) {
                return "";
            }

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        log.info(baos.toString());
    }
  
  protected void checkUserIdNamespace(Node node) throws Exception {
        CachedXPathAPI cachedXPathAPI = new CachedXPathAPI(); 
        NodeIterator iterator = cachedXPathAPI.selectNodeIterator(node, "//*[local-name() = 'userId']"); 
        Element root = (Element) iterator.nextNode(); 
        QName qname = DOMUtil.createQName(root, root.getAttributeNS("http://www.w3.org/2001/XMLSchema-instance", "type")); 
        assertEquals("http://www.w3.org/2001/XMLSchema", qname.getNamespaceURI()); 
        assertEquals("string", qname.getLocalPart()); 
  }

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        assertEquals("string", qname.getLocalPart()); 
  }
  
  protected void checkServiceNameNamespace(Node node) throws Exception {
        CachedXPathAPI cachedXPathAPI = new CachedXPathAPI(); 
        NodeIterator iterator = cachedXPathAPI.selectNodeIterator(node, "//*[local-name() = 'ServiceName']"); 
        Element root = (Element) iterator.nextNode(); 
        assertEquals(new QName("http://schemas.xmlsoap.org/ws/2003/03/addressing", "ServiceName"), 
                 new QName(root.getNamespaceURI(), root.getLocalName()));
        QName qname = DOMUtil.createQName(root, DOMUtil.getElementText(root)); 
        assertEquals(new QName("uri:test", "MyConsumerService"), qname); 
  }

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     * @return
     * @throws TransformerException
     */
    protected String textValueOfXPath(Node node, String xpath) throws TransformerException {
        CachedXPathAPI cachedXPathAPI = new CachedXPathAPI();
        NodeIterator iterator = cachedXPathAPI.selectNodeIterator(node, xpath);
        Node root = iterator.nextNode();
        if (root instanceof Element) {
            Element element = (Element) root;
            if (element == null) {
                return "";
            }

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