Examples of org.apache.xpath.objects.XNodeSet

org.apache.xpath.objects.XNodeSet
This class represents an XPath nodeset object, and is capable of converting the nodeset to other types, such as a string. @xsl.usage general

             new Object[]{ m_qname.getLocalPart() });  //"VariableReference given for variable out "+
  //      (new RuntimeException()).printStackTrace();
  //      error(xctxt, XPATHErrorResources.ER_COULDNOT_GET_VAR_NAMED,
  //            new Object[]{ m_qname.getLocalPart() });  //"Could not get variable named "+varName);
        
        result = new XNodeSet(xctxt.getDTMManager());
      }
  
      return result;
    }
    else

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   * @throws javax.xml.transform.TransformerException
   */
  public XObject execute(XPathContext xctxt, boolean destructiveOK) 
    throws javax.xml.transform.TransformerException
  {
    XNodeSet xns = (XNodeSet)super.execute(xctxt, destructiveOK);
    DTMManager dtmMgr = xctxt.getDTMManager();
    int context = xctxt.getContextNode();
    if(dtmMgr.getDTM(xns.getRoot()).getDocument() != 
       dtmMgr.getDTM(context).getDocument())
    {
      Expression expr = (Expression)xns.getContainedIter();
      xns = (XNodeSet)expr.asIterator(xctxt, context);
    }
    return xns;
  }

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         }
    } else {
        // not predicate => ContextNode == CurrentNode
        currentNode = xctxt.getContextNode();
    }
    return new XNodeSet(currentNode, xctxt.getDTMManager());
  }

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                          int stackFrame,
                          Expression expr )
    throws org.apache.xml.utils.WrappedRuntimeException
  {
    PrefixResolver savedResolver = xctxt.getNamespaceContext();
    XNodeSet result = null;


    try
    {
      xctxt.pushCurrentNode(context);
      xctxt.setNamespaceContext(prefixResolver);


      // The setRoot operation can take place with a reset operation, 
      // and so we may not be in the context of LocPathIterator#nextNode, 
      // so we have to set up the variable context, execute the expression, 
      // and then restore the variable context.


      if (isTopLevel)
      {
        // System.out.println("calling m_expr.execute(getXPathContext())");
        VariableStack vars = xctxt.getVarStack();


        // These three statements need to be combined into one operation.
        int savedStart = vars.getStackFrame();
        vars.setStackFrame(stackFrame);


        result = (org.apache.xpath.objects.XNodeSet) expr.execute(xctxt);
        result.setShouldCacheNodes(true);


        // These two statements need to be combined into one operation.
        vars.setStackFrame(savedStart);
      }
      else

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  {
    m_docKey = doc;
    m_keyDeclarations = keyDeclarations;
    KeyIterator ki = new KeyIterator(name, keyDeclarations);


    m_keyNodes = new XNodeSet(ki);
    m_keyNodes.allowDetachToRelease(false);
    m_keyNodes.setRoot(doc, xctxt);
  }

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   * @return a set of nodes referenced by the key named <CODE>name</CODE> and the reference <CODE>ref</CODE>. If no node is referenced by this key, an empty node set is returned.
   */
  public XNodeSet getNodeSetDTMByKey(QName name, XMLString ref)


  {
    XNodeSet refNodes = (XNodeSet) getRefsTable().get(ref);
    // clone wiht reset the node set
   try
    {
      if (refNodes != null)
      {
         refNodes = (XNodeSet) refNodes.cloneWithReset();
       }
    }
    catch (CloneNotSupportedException e)
    {
      refNodes = null;
    }


    if (refNodes == null) {
     //  create an empty XNodeSet
      KeyIterator ki = (KeyIterator) (m_keyNodes).getContainedIter();
      XPathContext xctxt = ki.getXPathContext();
      refNodes = new XNodeSet(xctxt.getDTMManager()) {
        public void setRoot(int nodeHandle, Object environment) {
          // Root cannot be set on non-iterated node sets. Ignore it.
        }
      };
      refNodes.reset();
    }


    return refNodes;
  }

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   * @param ref the value of the use clause of the current key for the given node
   * @param node the node to reference
   */
  private void addValueInRefsTable(XPathContext xctxt, XMLString ref, int node) {
    
    XNodeSet nodes = (XNodeSet) m_refsTable.get(ref);
    if (nodes == null)
    {
      nodes = new XNodeSet(node, xctxt.getDTMManager());
      nodes.nextNode();
      m_refsTable.put(ref, nodes);
    }
    else
    {
      // Nodes are passed to this method in document order.  Since we need to
      // suppress duplicates, we only need to check against the last entry
      // in each nodeset.  We use nodes.nextNode after each entry so we can
      // easily compare node against the current node.
      if (nodes.getCurrentNode() != node) {
          nodes.mutableNodeset().addNode(node);
          nodes.nextNode();
      }    
    }
  }

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        return dynamicXPath.execute(xctxt, myContext.getContextNode(),
                                    xctxt.getNamespaceContext());
      }
      catch (TransformerException e)
      {
        return new XNodeSet(xctxt.getDTMManager());
      }
    }
    else
      throw new SAXNotSupportedException(XSLMessages.createMessage(XSLTErrorResources.ER_INVALID_CONTEXT_PASSED, new Object[]{myContext })); //"Invalid context passed to evaluate "
  }

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  public XObject execute(XPathContext xctxt) throws javax.xml.transform.TransformerException
  {


    // TransformerImpl transformer = (TransformerImpl)xctxt;
    TransformerImpl transformer = (TransformerImpl) xctxt.getOwnerObject();
    XNodeSet nodes = null;
    int context = xctxt.getCurrentNode();
    DTM dtm = xctxt.getDTM(context);
    int docContext = dtm.getDocumentRoot(context);


    if (DTM.NULL == docContext)
    {


      // path.error(context, XPATHErrorResources.ER_CONTEXT_HAS_NO_OWNERDOC); //"context does not have an owner document!");
    }


    String xkeyname = getArg0().execute(xctxt).str();
    QName keyname = new QName(xkeyname, xctxt.getNamespaceContext());
    XObject arg = getArg1().execute(xctxt);
    boolean argIsNodeSetDTM = (XObject.CLASS_NODESET == arg.getType());
    KeyManager kmgr = transformer.getKeyManager();
    
    // Don't bother with nodeset logic if the thing is only one node.
    if(argIsNodeSetDTM)
    {
      XNodeSet ns = (XNodeSet)arg;
      ns.setShouldCacheNodes(true);
      int len = ns.getLength();
      if(len <= 1)
        argIsNodeSetDTM = false;
    }


    if (argIsNodeSetDTM)
    {
      Hashtable usedrefs = null;
      DTMIterator ni = arg.iter();
      int pos;
      UnionPathIterator upi = new UnionPathIterator();
      upi.exprSetParent(this);


      while (DTM.NULL != (pos = ni.nextNode()))
      {
        dtm = xctxt.getDTM(pos);
        XMLString ref = dtm.getStringValue(pos);


        if (null == ref)
          continue;


        if (null == usedrefs)
          usedrefs = new Hashtable();


        if (usedrefs.get(ref) != null)
        {
          continue;  // We already have 'em.
        }
        else
        {


          // ISTRUE being used as a dummy value.
          usedrefs.put(ref, ISTRUE);
        }


        XNodeSet nl =
          kmgr.getNodeSetDTMByKey(xctxt, docContext, keyname, ref,
                               xctxt.getNamespaceContext());
                               
        nl.setRoot(xctxt.getCurrentNode(), xctxt);


//        try
//        {
          upi.addIterator(nl);
//        }
//        catch(CloneNotSupportedException cnse)
//        {
//          // will never happen.
//        }
        //mnodeset.addNodesInDocOrder(nl, xctxt); needed??
      }


      int current = xctxt.getCurrentNode();
      upi.setRoot(current, xctxt);


      nodes = new XNodeSet(upi);
    }
    else
    {
      XMLString ref = arg.xstr();
      nodes = kmgr.getNodeSetDTMByKey(xctxt, docContext, keyname,

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        {
            // See http://www.w3.org/1999/11/REC-xslt-19991116-errata#E14.
            // If the second argument is an empty nodeset, this is an error.
            // The processor can recover by returning an empty nodeset.
            warn(xctxt, XSLTErrorResources.WG_EMPTY_SECOND_ARG, null);
            XNodeSet nodes = new XNodeSet(xctxt.getDTMManager());
             return nodes;
        } else{
          DTM baseDTM = xctxt.getDTM(baseNode);
          base = baseDTM.getDocumentBaseURI();
        }
        // %REVIEW% This doesn't seem to be a problem with the conformance
        // suite, but maybe it's just not doing a good test?
//        int baseDoc = baseDTM.getDocument();
//
//        if (baseDoc == DTM.NULL /* || baseDoc instanceof Stylesheet  -->What to do?? */)
//        {
//
//          // base = ((Stylesheet)baseDoc).getBaseIdentifier();
//          base = xctxt.getNamespaceContext().getBaseIdentifier();
//        }
//        else
//          base = xctxt.getSourceTreeManager().findURIFromDoc(baseDoc);
      }
      else
      {
        //Can not convert other type to a node-set!;
        arg2.iter();
      }
    }
    else
    {


      // If the second argument is omitted, then it defaults to 
      // the node in the stylesheet that contains the expression that 
      // includes the call to the document function. Note that a 
      // zero-length URI reference is a reference to the document 
      // relative to which the URI reference is being resolved; thus 
      // document("") refers to the root node of the stylesheet; 
      // the tree representation of the stylesheet is exactly 
      // the same as if the XML document containing the stylesheet 
      // was the initial source document.
      assertion(null != xctxt.getNamespaceContext(), "Namespace context can not be null!");
      base = xctxt.getNamespaceContext().getBaseIdentifier();
    }


    XNodeSet nodes = new XNodeSet(xctxt.getDTMManager());
    NodeSetDTM mnl = nodes.mutableNodeset();
    DTMIterator iterator = (XObject.CLASS_NODESET == arg.getType())
                            ? arg.iter() : null;
    int pos = DTM.NULL;


    while ((null == iterator) || (DTM.NULL != (pos = iterator.nextNode())))

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