code: /*
   * Licensed to the Apache Software Foundation (ASF) under one
   * or more contributor license agreements. See the NOTICE file
   * distributed with this work for additional information
   * regarding copyright ownership. The ASF licenses this file
   * to you under the Apache License, Version 2.0 (the  "License");
   * you may not use this file except in compliance with the License.
   * You may obtain a copy of the License at
   *
   *     http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  /*
   * $Id$
   */
  package org.apache.xpath.patterns;
  
  import org.apache.xml.dtm.Axis;
  import org.apache.xml.dtm.DTM;
  import org.apache.xml.dtm.DTMAxisTraverser;
  import org.apache.xml.dtm.DTMFilter;
  import org.apache.xpath.XPathContext;
  import org.apache.xpath.axes.WalkerFactory;
  import org.apache.xpath.objects.XObject;
  /**
   * Special context node pattern matcher.
   */
  public class ContextMatchStepPattern extends StepPattern
  {
      static final long serialVersionUID = -1888092779313211942L;
  
    /**
     * Construct a ContextMatchStepPattern.
     *
     */
    public ContextMatchStepPattern(int axis, int paxis)
    {
      super(DTMFilter.SHOW_ALL, axis, paxis);
    }
  
    /**
     * Execute this pattern step, including predicates.
     *
     *
     * @param xctxt XPath runtime context.
     *
     * @return {@link org.apache.xpath.patterns.NodeTest#SCORE_NODETEST},
     *         {@link org.apache.xpath.patterns.NodeTest#SCORE_NONE},
     *         {@link org.apache.xpath.patterns.NodeTest#SCORE_NSWILD},
     *         {@link org.apache.xpath.patterns.NodeTest#SCORE_QNAME}, or
     *         {@link org.apache.xpath.patterns.NodeTest#SCORE_OTHER}.
     *
     * @throws javax.xml.transform.TransformerException
     */
    public XObject execute(XPathContext xctxt)
            throws javax.xml.transform.TransformerException
    {
  
      if (xctxt.getIteratorRoot() == xctxt.getCurrentNode())
        return getStaticScore();
      else
        return this.SCORE_NONE;
    }
    
    /**
     * Execute the match pattern step relative to another step.
     *
     *
     * @param xctxt The XPath runtime context.
     * NEEDSDOC @param prevStep
     *
     * @return {@link org.apache.xpath.patterns.NodeTest#SCORE_NODETEST},
     *         {@link org.apache.xpath.patterns.NodeTest#SCORE_NONE},
     *         {@link org.apache.xpath.patterns.NodeTest#SCORE_NSWILD},
     *         {@link org.apache.xpath.patterns.NodeTest#SCORE_QNAME}, or
     *         {@link org.apache.xpath.patterns.NodeTest#SCORE_OTHER}.
     *
     * @throws javax.xml.transform.TransformerException
     */
    public XObject executeRelativePathPattern(
            XPathContext xctxt, StepPattern prevStep)
              throws javax.xml.transform.TransformerException
    {
  
      XObject score = NodeTest.SCORE_NONE;
      int context = xctxt.getCurrentNode();
      DTM dtm = xctxt.getDTM(context);
  
      if (null != dtm)
      {
        int predContext = xctxt.getCurrentNode();
        DTMAxisTraverser traverser;
        
        int axis = m_axis;
        
        boolean needToTraverseAttrs = WalkerFactory.isDownwardAxisOfMany(axis);
        boolean iterRootIsAttr = (dtm.getNodeType(xctxt.getIteratorRoot()) 
                                   == DTM.ATTRIBUTE_NODE);
  
        if((Axis.PRECEDING == axis) && iterRootIsAttr)
        {
          axis = Axis.PRECEDINGANDANCESTOR;
        }
        
        traverser = dtm.getAxisTraverser(axis);
  
        for (int relative = traverser.first(context); DTM.NULL != relative;
                relative = traverser.next(context, relative))
        {
          try
          {
            xctxt.pushCurrentNode(relative);
  
            score = execute(xctxt);
  
            if (score != NodeTest.SCORE_NONE)
            {
  	      //score = executePredicates( xctxt, prevStep, SCORE_OTHER, 
  	      //       predContext, relative);
  	      if (executePredicates(xctxt, dtm, context))
  		  return score;
  	      
  	      score = NodeTest.SCORE_NONE;
            }
            
            if(needToTraverseAttrs && iterRootIsAttr
               && (DTM.ELEMENT_NODE == dtm.getNodeType(relative)))
            {
              int xaxis = Axis.ATTRIBUTE;
              for (int i = 0; i < 2; i++) 
              {            
                DTMAxisTraverser atraverser = dtm.getAxisTraverser(xaxis);
          
                for (int arelative = atraverser.first(relative); 
                        DTM.NULL != arelative;
                        arelative = atraverser.next(relative, arelative))
                {
                  try
                  {
                    xctxt.pushCurrentNode(arelative);
          
                    score = execute(xctxt);
          
                    if (score != NodeTest.SCORE_NONE)
                    {
  		      //score = executePredicates( xctxt, prevStep, SCORE_OTHER, 
  		      //       predContext, arelative);
          
                      if (score != NodeTest.SCORE_NONE)
                        return score;
                    }
                  }
                  finally
                  {
                    xctxt.popCurrentNode();
                  }
                }
                xaxis = Axis.NAMESPACE;
              }
            }
  
          }
          finally
          {
            xctxt.popCurrentNode();
          }
        }
  
      }
  
      return score;
    }
  
  }
  