/**
   * <meta name="usage" content="advanced"/> Perform a query if needed, and call transformNode for
   * each child.
   *
   * @param transformer non-null reference to the the current transform-time state.
   * @param template The owning template context.
   * @throws TransformerException Thrown in a variety of circumstances.
   */
  public void transformSelectedNodes(TransformerImpl transformer) throws TransformerException {

    final XPathContext xctxt = transformer.getXPathContext();
    final int sourceNode = xctxt.getCurrentNode();
    DTMIterator sourceNodes = m_selectExpression.asIterator(xctxt, sourceNode);
    VariableStack vars = xctxt.getVarStack();
    int nParams = getParamElemCount();
    int thisframe = vars.getStackFrame();
    StackGuard guard = transformer.getStackGuard();
    boolean check = (guard.getRecursionLimit() > -1) ? true : false;

    try {

      final Vector keys =
          (m_sortElems == null) ? null : transformer.processSortKeys(this, sourceNode);

      // Sort if we need to.
      if (null != keys) sourceNodes = sortNodes(xctxt, keys, sourceNodes);

      if (TransformerImpl.S_DEBUG) {
        transformer
            .getTraceManager()
            .fireSelectedEvent(
                sourceNode,
                this,
                "select",
                new XPath(m_selectExpression),
                new org.apache.xpath.objects.XNodeSet(sourceNodes));
      }

      final ResultTreeHandler rth = transformer.getResultTreeHandler();
      ContentHandler chandler = rth.getContentHandler();
      final StylesheetRoot sroot = transformer.getStylesheet();
      final TemplateList tl = sroot.getTemplateListComposed();
      final boolean quiet = transformer.getQuietConflictWarnings();

      // Should be able to get this from the iterator but there must be a bug.
      DTM dtm = xctxt.getDTM(sourceNode);

      int argsFrame = -1;
      if (nParams > 0) {
        // This code will create a section on the stack that is all the
        // evaluated arguments.  These will be copied into the real params
        // section of each called template.
        argsFrame = vars.link(nParams);
        vars.setStackFrame(thisframe);

        for (int i = 0; i < nParams; i++) {
          ElemWithParam ewp = m_paramElems[i];
          XObject obj = ewp.getValue(transformer, sourceNode);

          vars.setLocalVariable(i, obj, argsFrame);
        }
        vars.setStackFrame(argsFrame);
      }

      xctxt.pushCurrentNode(DTM.NULL);
      IntStack currentNodes = xctxt.getCurrentNodeStack();

      xctxt.pushCurrentExpressionNode(DTM.NULL);
      IntStack currentExpressionNodes = xctxt.getCurrentExpressionNodeStack();

      xctxt.pushSAXLocatorNull();
      xctxt.pushContextNodeList(sourceNodes);
      transformer.pushElemTemplateElement(null);
      // pushParams(transformer, xctxt);

      int child;
      while (DTM.NULL != (child = sourceNodes.nextNode())) {
        currentNodes.setTop(child);
        currentExpressionNodes.setTop(child);

        if (xctxt.getDTM(child) != dtm) {
          dtm = xctxt.getDTM(child);
        }

        final int exNodeType = dtm.getExpandedTypeID(child);
        final int nodeType = dtm.getNodeType(child);

        final QName mode = transformer.getMode();

        ElemTemplate template = tl.getTemplateFast(xctxt, child, exNodeType, mode, -1, quiet, dtm);

        // If that didn't locate a node, fall back to a default template rule.
        // See http://www.w3.org/TR/xslt#built-in-rule.
        if (null == template) {
          switch (nodeType) {
            case DTM.DOCUMENT_FRAGMENT_NODE:
            case DTM.ELEMENT_NODE:
              template = sroot.getDefaultRule();
              // %OPT% direct faster?
              break;
            case DTM.ATTRIBUTE_NODE:
            case DTM.CDATA_SECTION_NODE:
            case DTM.TEXT_NODE:
              // if(rth.m_elemIsPending || rth.m_docPending)
              //  rth.flushPending(true);
              transformer.pushPairCurrentMatched(sroot.getDefaultTextRule(), child);
              transformer.setCurrentElement(sroot.getDefaultTextRule());
              // dtm.dispatchCharactersEvents(child, chandler, false);
              dtm.dispatchCharactersEvents(child, rth, false);
              transformer.popCurrentMatched();
              continue;
            case DTM.DOCUMENT_NODE:
              template = sroot.getDefaultRootRule();
              break;
            default:

              // No default rules for processing instructions and the like.
              continue;
          }
        } else {
          transformer.setCurrentElement(template);
        }

        transformer.pushPairCurrentMatched(template, child);
        if (check) guard.checkForInfinateLoop();

        int currentFrameBottom; // See comment with unlink, below
        if (template.m_frameSize > 0) {
          xctxt.pushRTFContext();
          currentFrameBottom = vars.getStackFrame(); // See comment with unlink, below
          vars.link(template.m_frameSize);
          // You can't do the check for nParams here, otherwise the
          // xsl:params might not be nulled.
          if (
          /* nParams > 0 && */ template.m_inArgsSize > 0) {
            int paramIndex = 0;
            for (ElemTemplateElement elem = template.getFirstChildElem();
                null != elem;
                elem = elem.getNextSiblingElem()) {
              if (Constants.ELEMNAME_PARAMVARIABLE == elem.getXSLToken()) {
                ElemParam ep = (ElemParam) elem;

                int i;
                for (i = 0; i < nParams; i++) {
                  ElemWithParam ewp = m_paramElems[i];
                  if (ewp.m_qnameID == ep.m_qnameID) {
                    XObject obj = vars.getLocalVariable(i, argsFrame);
                    vars.setLocalVariable(paramIndex, obj);
                    break;
                  }
                }
                if (i == nParams) vars.setLocalVariable(paramIndex, null);
              } else break;
              paramIndex++;
            }
          }
        } else currentFrameBottom = 0;

        // Fire a trace event for the template.
        if (TransformerImpl.S_DEBUG) transformer.getTraceManager().fireTraceEvent(template);

        // And execute the child templates.
        // Loop through the children of the template, calling execute on
        // each of them.
        for (ElemTemplateElement t = template.m_firstChild; t != null; t = t.m_nextSibling) {
          xctxt.setSAXLocator(t);
          try {
            transformer.pushElemTemplateElement(t);
            t.execute(transformer);
          } finally {
            transformer.popElemTemplateElement();
          }
        }

        if (TransformerImpl.S_DEBUG) transformer.getTraceManager().fireTraceEndEvent(template);

        if (template.m_frameSize > 0) {
          // See Frank Weiss bug around 03/19/2002 (no Bugzilla report yet).
          // While unlink will restore to the proper place, the real position
          // may have been changed for xsl:with-param, so that variables
          // can be accessed.
          // of right now.
          // More:
          // When we entered this function, the current
          // frame buffer (cfb) index in the variable stack may
          // have been manually set.  If we just call
          // unlink(), however, it will restore the cfb to the
          // previous link index from the link stack, rather than
          // the manually set cfb.  So,
          // the only safe solution is to restore it back
          // to the same position it was on entry, since we're
          // really not working in a stack context here. (Bug4218)
          vars.unlink(currentFrameBottom);
          xctxt.popRTFContext();
        }

        transformer.popCurrentMatched();
      } // end while (DTM.NULL != (child = sourceNodes.nextNode()))
    } catch (SAXException se) {
      transformer.getErrorListener().fatalError(new TransformerException(se));
    } finally {
      if (TransformerImpl.S_DEBUG)
        transformer
            .getTraceManager()
            .fireSelectedEndEvent(
                sourceNode,
                this,
                "select",
                new XPath(m_selectExpression),
                new org.apache.xpath.objects.XNodeSet(sourceNodes));

      // Unlink to the original stack frame
      if (nParams > 0) vars.unlink(thisframe);
      xctxt.popSAXLocator();
      xctxt.popContextNodeList();
      transformer.popElemTemplateElement();
      xctxt.popCurrentExpressionNode();
      xctxt.popCurrentNode();
      sourceNodes.detach();
    }
  }
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  /**
   * Invoke a named template.
   *
   * @see <a href="http://www.w3.org/TR/xslt#named-templates">named-templates in XSLT
   *     Specification</a>
   * @param transformer non-null reference to the the current transform-time state.
   * @throws TransformerException
   */
  public void execute(TransformerImpl transformer) throws TransformerException {

    if (null != m_template) {
      XPathContext xctxt = transformer.getXPathContext();
      VariableStack vars = xctxt.getVarStack();

      int thisframe = vars.getStackFrame();
      int nextFrame = vars.link(m_template.m_frameSize);

      // We have to clear the section of the stack frame that has params
      // so that the default param evaluation will work correctly.
      if (m_template.m_inArgsSize > 0) {
        vars.clearLocalSlots(0, m_template.m_inArgsSize);

        if (null != m_paramElems) {
          int currentNode = xctxt.getCurrentNode();
          vars.setStackFrame(thisframe);
          int size = m_paramElems.length;

          for (int i = 0; i < size; i++) {
            ElemWithParam ewp = m_paramElems[i];
            if (ewp.m_index >= 0) {
              XObject obj = ewp.getValue(transformer, currentNode);

              // Note here that the index for ElemWithParam must have been
              // statically made relative to the xsl:template being called,
              // NOT this xsl:template.
              vars.setLocalVariable(ewp.m_index, obj, nextFrame);
            }
          }
          vars.setStackFrame(nextFrame);
        }
      }

      SourceLocator savedLocator = xctxt.getSAXLocator();

      try {
        xctxt.setSAXLocator(m_template);

        // template.executeChildTemplates(transformer, sourceNode, mode, true);
        transformer.pushElemTemplateElement(m_template);
        m_template.execute(transformer);
      } finally {
        transformer.popElemTemplateElement();
        xctxt.setSAXLocator(savedLocator);
        // When we entered this function, the current
        // frame buffer (cfb) index in the variable stack may
        // have been manually set.  If we just call
        // unlink(), however, it will restore the cfb to the
        // previous link index from the link stack, rather than
        // the manually set cfb.  So,
        // the only safe solution is to restore it back
        // to the same position it was on entry, since we're
        // really not working in a stack context here. (Bug4218)
        vars.unlink(thisframe);
      }
    } else {
      transformer
          .getMsgMgr()
          .error(
              this,
              XSLTErrorResources.ER_TEMPLATE_NOT_FOUND,
              new Object[] {
                m_templateName
              }); // "Could not find template named: '"+templateName+"'");
    }
  }