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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        if (root == null) {
                  String msg = DOMMessageFormatter.formatMessage(DOMMessageFormatter.DOM_DOMAIN, "NOT_SUPPORTED_ERR", null);
                  throw new DOMException(DOMException.NOT_SUPPORTED_ERR, msg);
        }


        NodeIterator iterator = new NodeIteratorImpl(this,
                                                     root,
                                                     whatToShow,
                                                     filter,
                                                     entityReferenceExpansion);
        if (iterators == null) {

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        if (root == null) {
                  String msg = DOMMessageFormatter.formatMessage(DOMMessageFormatter.DOM_DOMAIN, "NOT_SUPPORTED_ERR", null);
                  throw new DOMException(DOMException.NOT_SUPPORTED_ERR, msg);
        }


        NodeIterator iterator = new NodeIteratorImpl(this,
                                                     root,
                                                     whatToShow,
                                                     filter,
                                                     entityReferenceExpansion);
        if (iterators == null) {

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                                throw new XPathException(XPathException.TYPE_ERR,fmsg);
//                              "The XPathResult of XPath expression {0} has an XPathResultType of {1} which cannot be converted to a single node.
//                               This method applies only to types ANY_UNORDERED_NODE_TYPE and FIRST_ORDERED_NODE_TYPE."
            }


                NodeIterator result = null;
                try {
                        result = m_resultObj.nodeset();
                } catch (TransformerException te) {
                        throw new XPathException(XPathException.TYPE_ERR,te.getMessage());
                }


        if (null == result) return null;


        Node node = result.nextNode();


        // Wrap "namespace node" in an XPathNamespace
        if (isNamespaceNode(node)) {
            return new XPathNamespaceImpl(node);
        } else {

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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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   public static Node selectSingleNode(
           Node contextNode, Node xpathnode, Node namespaceNode)
              throws TransformerException {


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


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

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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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        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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        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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