elemapplytemplates.java

来自「java jdk 1.4的源码」· Java 代码 · 共 485 行 · 第 1/2 页

    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();
    }
  }

}