Examples of org.apache.xpath.XPath

org.apache.xpath.XPath
The XPath class wraps an expression object and provides general services for execution of that expression.

    }
    finally
    {
      if (transformer.getDebug())
        transformer.getTraceManager().fireSelectedEndEvent(sourceNode, this,
                "select", new XPath(m_selectExpression),
                new org.apache.xpath.objects.XNodeSet(sourceNodes));


      xctxt.popSAXLocator();
      xctxt.popContextNodeList();
      transformer.popElemTemplateElement();

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        XPathContext xpc = new XPathContext();
        PrefixResolver pfx;
        if (pr == null)
        {
          pfx = new PrefixResolverDefault(d.getDocumentElement());
          xp = new XPath(query, null, pfx, XPath.SELECT, errors);
        }
        else
        {
          pfx = pr;
          if (xp == null)
          {
            xp = new XPath(query, null, pfx, XPath.SELECT, errors);
          }
        }


        final XObject xobject = xp.execute(xpc, n, pfx);

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        } else {
            prefixResolver = new PrefixResolverDefault(rootNode);
        }


        // Create the XPath object.
        xpath = new XPath(qstring, null, prefixResolver, XPath.SELECT, null);


        // execute the XPath query on the specified root node
        return new XObjectImpl(xpath.execute(xpathSupport, rootNode, prefixResolver));
    }

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        if (prefixResolver == null) prefixResolver = new PrefixResolverDefault(
          (namespaceNode.getNodeType() == Node.DOCUMENT_NODE) ? ((Document) namespaceNode).getDocumentElement() : namespaceNode);


        // Create the XPath object.
        XPath xpath = (XPath)XpathTable.get(path);
        if (xpath == null) {
          xpath = new XPath(path, null, prefixResolver, XPath.SELECT, null);
          XpathTable.put(path,xpath);
        }


        // Execute the XPath, and have it return the result
        int ctxtNode = xpathSupport.getDTMHandleFromNode(data);
        return xpath.execute(xpathSupport, ctxtNode, prefixResolver);
    }

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        ElemTemplate template = new ElemTemplate();


        appendAndPush(handler, template);


        XPath rootMatch = new XPath("/", stylesheet, stylesheet, XPath.MATCH, 
             handler.getStylesheetProcessor().getErrorListener());


        template.setMatch(rootMatch);


        // template.setDOMBackPointer(handler.getOriginatingNode());

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   */
  XPath getCountMatchPattern(XPathContext support, int contextNode)
          throws javax.xml.transform.TransformerException
  {


    XPath countMatchPattern = m_countMatchPattern;
    DTM dtm = support.getDTM(contextNode);
    if (null == countMatchPattern)
    {
      switch (dtm.getNodeType(contextNode))
      {
      case DTM.ELEMENT_NODE :
        MyPrefixResolver resolver;


        if (dtm.getNamespaceURI(contextNode) == null) {
             resolver =  new MyPrefixResolver(dtm.getNode(contextNode), dtm,contextNode, false);
        } else {
            resolver = new MyPrefixResolver(dtm.getNode(contextNode), dtm,contextNode, true);
        }


        countMatchPattern = new XPath(dtm.getNodeName(contextNode), this, resolver,
                                      XPath.MATCH, support.getErrorListener());
        break;


      case DTM.ATTRIBUTE_NODE :


        // countMatchPattern = m_stylesheet.createMatchPattern("@"+contextNode.getNodeName(), this);
        countMatchPattern = new XPath("@" + dtm.getNodeName(contextNode), this,
                                      this, XPath.MATCH, support.getErrorListener());
        break;
      case DTM.CDATA_SECTION_NODE :
      case DTM.TEXT_NODE :


        // countMatchPattern = m_stylesheet.createMatchPattern("text()", this);
        countMatchPattern = new XPath("text()", this, this, XPath.MATCH, support.getErrorListener());
        break;
      case DTM.COMMENT_NODE :


        // countMatchPattern = m_stylesheet.createMatchPattern("comment()", this);
        countMatchPattern = new XPath("comment()", this, this, XPath.MATCH, support.getErrorListener());
        break;
      case DTM.DOCUMENT_NODE :


        // countMatchPattern = m_stylesheet.createMatchPattern("/", this);
        countMatchPattern = new XPath("/", this, this, XPath.MATCH, support.getErrorListener());
        break;
      case DTM.PROCESSING_INSTRUCTION_NODE :


        // countMatchPattern = m_stylesheet.createMatchPattern("pi("+contextNode.getNodeName()+")", this);
        countMatchPattern = new XPath("pi(" + dtm.getNodeName(contextNode)
                                      + ")", this, this, XPath.MATCH, support.getErrorListener());
        break;
      default :
        countMatchPattern = null;
      }

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   */
  public int getPreviousNode(XPathContext xctxt, int pos)
          throws TransformerException
  {


    XPath countMatchPattern = getCountMatchPattern(xctxt, pos);
    DTM dtm = xctxt.getDTM(pos);


    if (Constants.NUMBERLEVEL_ANY == m_level)
    {
      XPath fromMatchPattern = m_fromMatchPattern;


      // Do a backwards document-order walk 'till a node is found that matches 
      // the 'from' pattern, or a node is found that matches the 'count' pattern, 
      // or the top of the tree is found.
      while (DTM.NULL != pos)
      {


        // Get the previous sibling, if there is no previous sibling, 
        // then count the parent, but if there is a previous sibling, 
        // dive down to the lowest right-hand (last) child of that sibling.
        int next = dtm.getPreviousSibling(pos);


        if (DTM.NULL == next)
        {
          next = dtm.getParent(pos);


          if ((DTM.NULL != next) && ((((null != fromMatchPattern) && (fromMatchPattern.getMatchScore(
                  xctxt, next) != XPath.MATCH_SCORE_NONE))) 
              || (dtm.getNodeType(next) == DTM.DOCUMENT_NODE)))
          {
            pos = DTM.NULL;  // return null from function.

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  public int getTargetNode(XPathContext xctxt, int sourceNode)
          throws TransformerException
  {


    int target = DTM.NULL;
    XPath countMatchPattern = getCountMatchPattern(xctxt, sourceNode);


    if (Constants.NUMBERLEVEL_ANY == m_level)
    {
      target = findPrecedingOrAncestorOrSelf(xctxt, m_fromMatchPattern,
                                             countMatchPattern, sourceNode,

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          XPathContext xctxt, int node, boolean stopAtFirstFound)
            throws javax.xml.transform.TransformerException
  {


    NodeSetDTM ancestors = new NodeSetDTM(xctxt.getDTMManager());
    XPath countMatchPattern = getCountMatchPattern(xctxt, node);
    DTM dtm = xctxt.getDTM(node);


    while (DTM.NULL != node)
    {
      if ((null != m_fromMatchPattern)
              && (m_fromMatchPattern.getMatchScore(xctxt, node)
                  != XPath.MATCH_SCORE_NONE))
      {


        // The following if statement gives level="single" different 
        // behavior from level="multiple", which seems incorrect according 
        // to the XSLT spec.  For now we are leaving this in to replicate 
        // the same behavior in XT, but, for all intents and purposes we 
        // think this is a bug, or there is something about level="single" 
        // that we still don't understand.
        if (!stopAtFirstFound)
          break;
      }


      if (null == countMatchPattern)
        System.out.println(
          "Programmers error! countMatchPattern should never be null!");


      if (countMatchPattern.getMatchScore(xctxt, node)
              != XPath.MATCH_SCORE_NONE)
      {
        ancestors.addElement(node);


        if (stopAtFirstFound)

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            throws org.xml.sax.SAXException
  {


    try
    {
      XPath expr = handler.createXPath(value, owner);


      return expr;
    }
    catch (TransformerException te)
    {

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