import com.sun.org.apache.xpath.internal.axes.WalkerFactory; //导入依赖的package包/类
/**
 * Get the analysis bits for this walker, as defined in the WalkerFactory.
 * @return One of WalkerFactory#BIT_DESCENDANT, etc.
 */
public int getAnalysisBits()
{

  // J2SE does not support Xalan interpretive
  /*
      com.sun.org.apache.xalan.internal.templates.ElemVariable vvar = getElemVariable();
      if(null != vvar)
      {
              XPath xpath = vvar.getSelect();
              if(null != xpath)
              {
                      Expression expr = xpath.getExpression();
                      if(null != expr && expr instanceof PathComponent)
                      {
                              return ((PathComponent)expr).getAnalysisBits();
                      }
              }
      }
  */

  return WalkerFactory.BIT_FILTER;
}
 

import com.sun.org.apache.xpath.internal.axes.WalkerFactory; //导入依赖的package包/类
/**
 * Compile a location path.  The LocPathIterator itself may create
 * {@link com.sun.org.apache.xpath.internal.axes.AxesWalker} children.
 *
 * @param opPos The current position in the m_opMap array.
 *
 * @return reference to {@link com.sun.org.apache.xpath.internal.axes.LocPathIterator} instance.
 *
 * @throws TransformerException if a error occurs creating the Expression.
 */
public Expression locationPath(int opPos) throws TransformerException
{
  locPathDepth++;
  try
  {
    DTMIterator iter = WalkerFactory.newDTMIterator(this, opPos, (locPathDepth == 0));
    return (Expression)iter; // cast OK, I guess.
  }
  finally
  {
    locPathDepth--;
  }
}