Examples of org.apache.xpath.NodeSet

org.apache.xpath.NodeSet

The NodeSet class can act as either a NodeVector, NodeList, or NodeIterator. However, in order for it to act as a NodeVector or NodeList, it's required that setShouldCacheNodes(true) be called before the first nextNode() is called, in order that nodes can be added as they are fetched. Derived classes that implement iterators must override runTo(int index), in order that they may run the iteration to the given index.

Note that we directly implement the DOM's NodeIterator interface. We do not emulate all the behavior of the standard NodeIterator. In particular, we do not guarantee to present a "live view" of the document ... but in XSLT, the source document should never be mutated, so this should never be an issue.

Thought: Should NodeSet really implement NodeList and NodeIterator, or should there be specific subclasses of it which do so? The advantage of doing it all here is that all NodeSets will respond to the same calls; the disadvantage is that some of them may return less-than-enlightening results when you do so.
@xsl.usage advanced

   * @see <a href="http://www.exslt.org/">EXSLT</a>
   */
  public static boolean hasSameNode(NodeList nl1, NodeList nl2)
  {
    
    NodeSet ns1 = new NodeSet(nl1);
    NodeSet ns2 = new NodeSet(nl2);


    for (int i = 0; i < ns1.getLength(); i++)
    {
      if (ns2.contains(ns1.elementAt(i)))
        return true;
    }
    return false;
  }

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    String textNodeValue;


    if (rtf instanceof NodeIterator)
    {
      return new NodeSet((NodeIterator) rtf);
    }
    else
    {
      if (rtf instanceof String)
      {
        textNodeValue = (String) rtf;
      }
      else if (rtf instanceof Boolean)
      {
        textNodeValue = new XBoolean(((Boolean) rtf).booleanValue()).str();
      }
      else if (rtf instanceof Double)
      {
        textNodeValue = new XNumber(((Double) rtf).doubleValue()).str();
      }
      else
      {
        textNodeValue = rtf.toString();
      }


      // This no longer will work right since the DTM.
      // Document myDoc = myProcessor.getContextNode().getOwnerDocument();
      try
      {
        DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
        DocumentBuilder db = dbf.newDocumentBuilder();
        Document myDoc = db.newDocument();
        
        Text textNode = myDoc.createTextNode(textNodeValue);
        DocumentFragment docFrag = myDoc.createDocumentFragment();
  
        docFrag.appendChild(textNode);
  
        return new NodeSet(docFrag);
      }
      catch(ParserConfigurationException pce)
      {
        throw new org.apache.xml.utils.WrappedRuntimeException(pce);
      }

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   * @return true if nl1 and nl2 contain exactly the same set of nodes.
   */
  public static boolean hasSameNodes(NodeList nl1, NodeList nl2)
  {


    NodeSet ns1 = new NodeSet(nl1);
    NodeSet ns2 = new NodeSet(nl2);


    if (ns1.getLength() != ns2.getLength())
      return false;


    for (int i = 0; i < ns1.getLength(); i++)
    {
      Node n = ns1.elementAt(i);


      if (!ns2.contains(n))
        return false;
    }


    return true;
  }

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    Document doc = DocumentHolder.m_doc;




    StringTokenizer lTokenizer = new StringTokenizer(toTokenize, delims);
    NodeSet resultSet = new NodeSet();


    synchronized (doc)
    {
      while (lTokenizer.hasMoreTokens())
      {
        resultSet.addNode(doc.createTextNode(lTokenizer.nextToken()));
      }
    }


    return resultSet;
  }

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      xctxt = ((XPathContext.XPathExpressionContext) myContext).getXPathContext();
    else
      throw new SAXNotSupportedException(XSLMessages.createMessage(XSLTErrorResources.ER_INVALID_CONTEXT_PASSED, new Object[]{myContext }));


    if (expr == null || expr.length() == 0)
      return new NodeSet();
      
    NodeSetDTM contextNodes = new NodeSetDTM(nl, xctxt);
    xctxt.pushContextNodeList(contextNodes);
    
    NodeSet resultSet = new NodeSet();
    resultSet.setShouldCacheNodes(true);
    
    for (int i = 0; i < nl.getLength(); i++)
    {
      int contextNode = contextNodes.item(i);
      xctxt.pushCurrentNode(contextNode);
      
      XObject object = null;
      try
      {
        XPath dynamicXPath = new XPath(expr, xctxt.getSAXLocator(),
                                       xctxt.getNamespaceContext(),
                                       XPath.SELECT);
        object = dynamicXPath.execute(xctxt, contextNode, xctxt.getNamespaceContext());
        
        if (object instanceof XNodeSet)
        {
          NodeList nodelist = null;
          nodelist = ((XNodeSet)object).nodelist();
        
          for (int k = 0; k < nodelist.getLength(); k++)
          {
            Node n = nodelist.item(k);
            if (!resultSet.contains(n))
              resultSet.addNode(n);
          }
        }
        else
        {
    if (lDoc == null)
    {
            DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
            dbf.setNamespaceAware(true);
            DocumentBuilder db = dbf.newDocumentBuilder();
            lDoc = db.newDocument();
          }
        
          Element element = null;
          if (object instanceof XNumber)
            element = lDoc.createElementNS(EXSL_URI, "exsl:number");
          else if (object instanceof XBoolean)
            element = lDoc.createElementNS(EXSL_URI, "exsl:boolean");
          else
            element = lDoc.createElementNS(EXSL_URI, "exsl:string");
          
          Text textNode = lDoc.createTextNode(object.str());
          element.appendChild(textNode);
          resultSet.addNode(element);
        }
      }
      catch (Exception e)
      {
        xctxt.popCurrentNode();
        xctxt.popContextNodeList();
        return new NodeSet();
      }
      
      xctxt.popCurrentNode();
      
    }

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      xctxt = ((XPathContext.XPathExpressionContext) myContext).getXPathContext();
    else
      throw new SAXNotSupportedException(XSLMessages.createMessage(XSLTErrorResources.ER_INVALID_CONTEXT_PASSED, new Object[]{myContext }));


    if (expr == null || expr.length() == 0)
      return new NodeSet();
          
    NodeSet closureSet = new NodeSet();
    closureSet.setShouldCacheNodes(true);
        
    NodeList iterationList = nl;
    do
    {
    
      NodeSet iterationSet = new NodeSet();


      NodeSetDTM contextNodes = new NodeSetDTM(iterationList, xctxt);
      xctxt.pushContextNodeList(contextNodes);
      
      for (int i = 0; i < iterationList.getLength(); i++)
      {
        int contextNode = contextNodes.item(i);
        xctxt.pushCurrentNode(contextNode);


        XObject object = null;
        try
        {
          XPath dynamicXPath = new XPath(expr, xctxt.getSAXLocator(),
                                         xctxt.getNamespaceContext(),
                                         XPath.SELECT);
          object = dynamicXPath.execute(xctxt, contextNode, xctxt.getNamespaceContext());
          
          if (object instanceof XNodeSet)
          {
            NodeList nodelist = null;
            nodelist = ((XNodeSet)object).nodelist();
        
            for (int k = 0; k < nodelist.getLength(); k++)
            {
              Node n = nodelist.item(k);
              if (!iterationSet.contains(n))
                iterationSet.addNode(n);
            }        
          }
          else
          {
            xctxt.popCurrentNode();
            xctxt.popContextNodeList();
            return new NodeSet();
          }          
        }
        catch (TransformerException e)
        {
          xctxt.popCurrentNode();
          xctxt.popContextNodeList();
          return new NodeSet();
        }
      
        xctxt.popCurrentNode();
            
      }

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           traverseChildren(listVector, dtm.getNode(node), tagname,
                            isTagNameWildCard);
         }
       }
       int size = listVector.size();
       NodeSet nodeSet = new NodeSet(size);
       for (int i = 0; i < size; i++) 
       {
         nodeSet.addNode((Node) listVector.elementAt(i));
       }
       return (NodeList) nodeSet;
  }

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      {
        traverseChildren(listVector, dtm.getNode(node), namespaceURI, localName, isNamespaceURIWildCard, isLocalNameWildCard);
      }
    }
    int size = listVector.size();
    NodeSet nodeSet = new NodeSet(size);
    for (int i = 0; i < size; i++)
    {
      nodeSet.addNode((Node)listVector.elementAt(i));
    }
    return (NodeList) nodeSet;
  }

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           FileNotFoundException,
           IOException,
     TransformerException {
    String href = getFilename(context, elem);


    NodeSet textNodes = new NodeSet();
    Document textDoc = DOMImplementationImpl.getDOMImplementation().createDocument(null, "tmpDoc", null);


    URL fileURL = null;


    try {
      try {
  fileURL = new URL(href);
      } catch (MalformedURLException e1) {
  try {
    fileURL = new URL("file:" + href);
  } catch (MalformedURLException e2) {
    System.out.println("Cannot open " + href);
    return null;
  }
      }


      InputStreamReader isr = new InputStreamReader(fileURL.openStream());
      BufferedReader is = new BufferedReader(isr);


      char chars[] = new char[4096];
      int len = 0;
      while ((len = is.read(chars)) > 0) {
  String s = new String(chars, 0, len);
  // Does it matter that this produces multiple, adjacent text
  // nodes? I don't think so...
  textNodes.addNode(textDoc.createTextNode(s));
      }
      is.close();
    } catch (Exception e) {
      System.out.println("Cannot read " + href);
    }

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   */
  public static NodeList split(String str, String pattern)
  {


    
    NodeSet resultSet = new NodeSet();
    resultSet.setShouldCacheNodes(true);
    
    boolean done = false;
    int fromIndex = 0;
    int matchIndex = 0;
    String token = null;
    
    while (!done && fromIndex < str.length())
    {
      matchIndex = str.indexOf(pattern, fromIndex);
      if (matchIndex >= 0)
      {
  token = str.substring(fromIndex, matchIndex);
  fromIndex = matchIndex + pattern.length();
      }
      else
      {
        done = true;
        token = str.substring(fromIndex);
      }


      Document doc = DocumentHolder.m_doc;
      synchronized (doc)
      {
        Element element = doc.createElement("token");
        Text text = doc.createTextNode(token);
        element.appendChild(text);
        resultSet.addNode(element);      
      }
    }
    
    return resultSet;
  }

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