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 NodeList intersection(NodeList nl1, NodeList nl2)
  {
    NodeSet ns1 = new NodeSet(nl1);
    NodeSet ns2 = new NodeSet(nl2);
    NodeSet inter = new NodeSet();


    inter.setShouldCacheNodes(true);


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


      if (ns2.contains(n))
        inter.addElement(n);
    }


    return inter;
  }

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


    NodeSet diff = new NodeSet();


    diff.setShouldCacheNodes(true);


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


      if (!ns2.contains(n))
        diff.addElement(n);
    }


    return diff;
  }

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   * 
   * @see <a href="http://www.exslt.org/">EXSLT</a>
   */
  public static NodeList distinct(NodeList nl)
  {
    NodeSet dist = new NodeSet();
    dist.setShouldCacheNodes(true);


    Map stringTable = new HashMap();
    
    for (int i = 0; i < nl.getLength(); i++)
    {
      Node currNode = nl.item(i);
      String key = toString(currNode);
      
      if (key == null)
        dist.addElement(currNode);
      else if (!stringTable.containsKey(key))
      {
        stringTable.put(key, currNode);
        dist.addElement(currNode);        
      }
    }


    return dist;
  }

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   * @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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           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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    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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    {
      throw new org.apache.xml.utils.WrappedRuntimeException(pce);
    }


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


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


    return resultSet;
  }

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   */
  public static NodeList highest (NodeList nl)
  {        
    double maxValue = max(nl);


    NodeSet highNodes = new NodeSet();
    highNodes.setShouldCacheNodes(true);    
    
    if (Double.isNaN(maxValue))
      return highNodes;  // empty Nodeset
    
    for (int i = 0; i < nl.getLength(); i++)
    {
      Node n = nl.item(i);
      double d = toNumber(n); 
      if (d == maxValue)
        highNodes.addElement(n);
    }
    return highNodes;
  }

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com.sun.msv.schmit.XalanExtension

org.apache.xalan.lib.ExsltDynamic

org.apache.xalan.lib.ExsltMath

org.apache.xalan.lib.ExsltSets

org.apache.xalan.lib.ExsltStrings

org.apache.xalan.lib.Extensions

org.apache.xalan.templates.FuncDocument

org.apache.xalan.transformer.KeyRefIterator

org.apache.xml.dtm.ref.DTMNodeProxy

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