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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          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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        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 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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            int ctxtNode = xpathContext.getDTMHandleFromNode(node);
            XObject xresult = xpath.execute(xpathContext, ctxtNode, customPrefixResolver);
            if (xresult instanceof XNodeSet) {
                NodeListModel result = new NodeListModel(node);
                result.xpathSupport = this;
                NodeIterator nodeIterator = xresult.nodeset();
                Node n;
                do {
                    n = nodeIterator.nextNode();
                    if (n != null) {
                        result.add(n);
                    }
                } while (n != null);
                return result.size() == 1 ? result.get(0) : result;

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            int ctxtNode = xpathContext.getDTMHandleFromNode(node);
            XObject xresult = xpath.execute(xpathContext, ctxtNode, customPrefixResolver);
            if (xresult instanceof XNodeSet) {
                NodeListModel result = new NodeListModel(node);
                result.xpathSupport = this;
                NodeIterator nodeIterator = xresult.nodeset();
                Node n;
                do {
                    n = nodeIterator.nextNode();
                    if (n != null) {
                        result.add(n);
                    }
                } while (n != null);
                return result.size() == 1 ? result.get(0) : result;

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           String fmsg = XSLMessages.createXPATHMessage(XPATHErrorResources.ER_CANT_CONVERT_TO_SINGLENODE, new Object[] {getTypeString(m_resultType)});                        
       throw new XPathException(XPathException.TYPE_ERR,fmsg); // Can not convert {0} to a single node. This getter applies 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 (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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