Examples of org.apache.xpath.objects.XObject

org.apache.xpath.objects.XObject
This class represents an XPath object, and is capable of converting the object to various types, such as a string. This class acts as the base class to other XPath type objects, such as XString, and provides polymorphic casting capabilities. @xsl.usage general

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


    XObject left = m_left.execute(xctxt, true);
    XObject right = m_right.execute(xctxt, true);


    XObject result = operate(left, right);
    left.detach();
    right.detach();
    return result;
  }

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      }*/
      else
      {


        // Get values dynamically
        XObject r1 = k.m_selectPat.execute(m_execContext, n1.m_node,
                                           k.m_namespaceContext);
        XObject r2 = k.m_selectPat.execute(m_execContext, n2.m_node,
                                           k.m_namespaceContext);
        n1Num = r1.num();


        // Can't use NaN for compare. They are never equal. Use zero instead.
        // That way we can keep elements in document order. 
        //n1Num = Double.isNaN(d) ? 0.0 : d;
        n2Num = r2.num();
        //n2Num = Double.isNaN(d) ? 0.0 : d;
      }


      if ((n1Num == n2Num) && ((kIndex + 1) < m_keys.size()))
      {
        result = compare(n1, n2, kIndex + 1, support);
      }
      else
      {
        double diff;
        if (Double.isNaN(n1Num))
        {
          if (Double.isNaN(n2Num))
            diff = 0.0;
          else
            diff = -1;
        }
        else if (Double.isNaN(n2Num))
           diff = 1;
        else
          diff = n1Num - n2Num;


        // process order parameter 
        result = (int) ((diff < 0.0)
                        ? (k.m_descending ? 1 : -1)
                        : (diff > 0.0) ? (k.m_descending ? -1 : 1) : 0);
      }
    }  // end treat as numbers 
    else
    {
      CollationKey n1String, n2String;


      if (kIndex == 0)
      {
        n1String = (CollationKey) n1.m_key1Value;
        n2String = (CollationKey) n2.m_key1Value;
      }
      else if (kIndex == 1)
      {
        n1String = (CollationKey) n1.m_key2Value;
        n2String = (CollationKey) n2.m_key2Value;
      }


      /* Leave this in case we decide to use an array later
      if (kIndex < maxkey)
      {
        String n1String = (String)n1.m_keyValue[kIndex];
        String n2String = (String)n2.m_keyValue[kIndex];
      }*/
      else
      {


        // Get values dynamically
        XObject r1 = k.m_selectPat.execute(m_execContext, n1.m_node,
                                           k.m_namespaceContext);
        XObject r2 = k.m_selectPat.execute(m_execContext, n2.m_node,
                                           k.m_namespaceContext);


        n1String = k.m_col.getCollationKey(r1.str());
        n2String = k.m_col.getCollationKey(r2.str());
      }


      // Use collation keys for faster compare, but note that whitespaces 
      // etc... are treated differently from if we were comparing Strings.
      result = n1String.compareTo(n2String);

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      m_node = node;


      if (!m_keys.isEmpty())
      {
        NodeSortKey k1 = (NodeSortKey) m_keys.elementAt(0);
        XObject r = k1.m_selectPat.execute(m_execContext, node,
                                           k1.m_namespaceContext);


        double d;


        if (k1.m_treatAsNumbers)
        {
          d = r.num();


          // Can't use NaN for compare. They are never equal. Use zero instead.  
          m_key1Value = new Double(d);
        }
        else
        {
          m_key1Value = k1.m_col.getCollationKey(r.str());
        }


        if (r.getType() == XObject.CLASS_NODESET)
        {
          // %REVIEW%
          DTMIterator ni = ((XNodeSet)r).iterRaw();
          int current = ni.getCurrentNode();
          if(DTM.NULL == current)
            current = ni.nextNode();


          // if (ni instanceof ContextNodeList) // %REVIEW%
          // tryNextKey = (DTM.NULL != current);


          // else abdicate... should never happen, but... -sb
        }


        if (m_keys.size() > 1)
        {
          NodeSortKey k2 = (NodeSortKey) m_keys.elementAt(1);


          XObject r2 = k2.m_selectPat.execute(m_execContext, node,
                                              k2.m_namespaceContext);


          if (k2.m_treatAsNumbers) {
            d = r2.num();
            m_key2Value = new Double(d);
          } else {
            m_key2Value = k2.m_col.getCollationKey(r2.str());
          }
        }


        /* Leave this in case we decide to use an array later
        while (kIndex <= m_keys.size() && kIndex < maxkey)

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        // if m_document is not null, build the DTM from the document 
        if (null != m_doc) {
            xpathSupport.getDTMHandleFromNode(m_doc);
        }


        XObject xobj = null;
        try {
            xobj = m_xpath.execute(xpathSupport, contextNode, null);         
        } catch (TransformerException te) {
            // What should we do here?
            throw new XPathException(XPathException.INVALID_EXPRESSION_ERR,te.getMessageAndLocation());

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    if(!vars.isLocalSet(m_index))
    {


      int sourceNode = transformer.getXPathContext().getCurrentNode();
      XObject var = getValue(transformer, sourceNode);
  
      // transformer.getXPathContext().getVarStack().pushVariable(m_qname, var);
      transformer.getXPathContext().getVarStack().setLocalVariable(m_index, var);
    }

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      // 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,
                                                ref,
                                                xctxt.getNamespaceContext());
      nodes.setRoot(xctxt.getCurrentNode(), xctxt);
    }

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


    int context = getArg0AsNode(xctxt);
    XObject val;


    if (DTM.NULL != context)
    {
      DTM dtm = xctxt.getDTM(context);
      String qname = dtm.getNodeNameX(context);

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    int docContext = dtm.getDocument();


    if (DTM.NULL == docContext)
      error(xctxt, XPATHErrorResources.ER_CONTEXT_HAS_NO_OWNERDOC, null);


    XObject arg = m_arg0.execute(xctxt);
    int argType = arg.getType();
    XNodeSet nodes = new XNodeSet(xctxt.getDTMManager());
    NodeSetDTM nodeSet = nodes.mutableNodeset();


    if (XObject.CLASS_NODESET == argType)
    {
      DTMIterator ni = arg.iter();
      StringVector usedrefs = null;
      int pos = ni.nextNode();


      while (DTM.NULL != pos)
      {
        DTM ndtm = ni.getDTM(pos);
        String refval = ndtm.getStringValue(pos).toString();


        pos = ni.nextNode();
        usedrefs = getNodesByID(xctxt, docContext, refval, usedrefs, nodeSet,
                                DTM.NULL != pos);
      }
      // ni.detach();
    }
    else if (XObject.CLASS_NULL == argType)
    {
      return nodes;
    }
    else
    {
      String refval = arg.str();


      getNodesByID(xctxt, docContext, refval, null, nodeSet, false);
    }


    return nodes;

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          Node contextNode, String str, Node namespaceNode)
            throws TransformerException
  {


    // Execute the XPath, and have it return the result
    XObject list = eval(contextNode, str, namespaceNode);


    // Have the XObject return its result as a NodeSetDTM.                
    return list.nodeset();
  }

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          Node contextNode, String str, Node namespaceNode)
            throws TransformerException
  {


    // Execute the XPath, and have it return the result
    XObject list = eval(contextNode, str, namespaceNode);


    // Return a NodeList.
    return list.nodelist();
  }

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