Java XPathContext.getDTM方法代码示例

import org.apache.xpath.XPathContext; //导入方法依赖的package包/类
/**
 * Get information about whether or not an element should strip whitespace.
 * @see <a href="http://www.w3.org/TR/xslt#strip">strip in XSLT Specification</a>
 *
 * @param support The XPath runtime state.
 * @param targetElement Element to check
 *
 * @return true if the whitespace should be stripped.
 *
 * @throws TransformerException
 */
public boolean shouldStripWhiteSpace(
        XPathContext support, int targetElement) throws TransformerException
{
  if (null != m_whiteSpaceInfoList)
  {
    while(DTM.NULL != targetElement)
    {
      DTM dtm = support.getDTM(targetElement);
      WhiteSpaceInfo info = (WhiteSpaceInfo) m_whiteSpaceInfoList.getTemplate(support,
              targetElement, null, false, dtm);
      if(null != info)
        return info.getShouldStripSpace();
      
      int parent = dtm.getParent(targetElement);
      if(DTM.NULL != parent && DTM.ELEMENT_NODE == dtm.getNodeType(parent))
        targetElement = parent;
      else
        targetElement = DTM.NULL;
    }
  }
  return false;
}
 

import org.apache.xpath.XPathContext; //导入方法依赖的package包/类
/**
 * Construct a TransformerHandlerImpl.
 *
 * @param transformer Non-null reference to the Xalan transformer impl.
 * @param doFragment True if the result should be a document fragement.
 * @param baseSystemID  The system ID to use as the base for relative URLs.
 */
public TransformerHandlerImpl(TransformerImpl transformer,
                              boolean doFragment, String baseSystemID)
{

  super();

  m_transformer = transformer;
  m_baseSystemID = baseSystemID;

  XPathContext xctxt = transformer.getXPathContext();
  DTM dtm = xctxt.getDTM(null, true, transformer, true, true);
  
  m_dtm = dtm;
  dtm.setDocumentBaseURI(baseSystemID);

  m_contentHandler = dtm.getContentHandler();
  m_dtdHandler = dtm.getDTDHandler();
  m_entityResolver = dtm.getEntityResolver();
  m_errorHandler = dtm.getErrorHandler();
  m_lexicalHandler = dtm.getLexicalHandler();
  m_incremental = transformer.getIncremental();
  m_optimizer = transformer.getOptimize();
  m_source_location = transformer.getSource_location();
}
 

import org.apache.xpath.XPathContext; //导入方法依赖的package包/类
/**
 * Execute an expression in the XPath runtime context, and return the 
 * result of the expression.
 *
 *
 * @param xctxt The XPath runtime context.
 *
 * @return The result of the expression in the form of a <code>XObject</code>.
 *
 * @throws javax.xml.transform.TransformerException if a runtime exception 
 *         occurs.
 */
public void executeCharsToContentHandler(XPathContext xctxt, 
                                            ContentHandler handler)
  throws javax.xml.transform.TransformerException,
         org.xml.sax.SAXException
{
  if(Arg0IsNodesetExpr())
  {
    int node = getArg0AsNode(xctxt);
    if(DTM.NULL != node)
    {
      DTM dtm = xctxt.getDTM(node);
      dtm.dispatchCharactersEvents(node, handler, true);
    }
  }
  else
  {
    XObject obj = execute(xctxt);
    obj.dispatchCharactersEvents(handler);
  }
}
 

import org.apache.xpath.XPathContext; //导入方法依赖的package包/类
/**
 * Initialize the context values for this expression
 * after it is cloned.
 *
 * @param context The XPath runtime context for this
 * transformation.
 */
public void setRoot(int context, Object environment)
{

  m_context = context;
  
  XPathContext xctxt = (XPathContext)environment;
  m_execContext = xctxt;
  m_cdtm = xctxt.getDTM(context);
  
  m_currentContextNode = context; // only if top level?
  
  // Yech, shouldn't have to do this.  -sb
  if(null == m_prefixResolver)
  	m_prefixResolver = xctxt.getNamespaceContext();
      
  m_lastFetched = DTM.NULL;
  m_foundLast = false;
  m_pos = 0;
  m_length = -1;

  if (m_isTopLevel)
    this.m_stackFrame = xctxt.getVarStack().getStackFrame();
    
  // reset();
}
 

import org.apache.xpath.XPathContext; //导入方法依赖的package包/类
/**
 * Execute the function.  The function must return
 * a valid object.
 * @param xctxt The current execution context.
 * @return A valid XObject.
 *
 * @throws javax.xml.transform.TransformerException
 */
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);
    val = (null == qname) ? XString.EMPTYSTRING : new XString(qname);
  }
  else
  {
    val = XString.EMPTYSTRING;
  }

  return val;
}
 

import org.apache.xpath.XPathContext; //导入方法依赖的package包/类
/**
 * Execute the first argument expression that is expected to return a
 * string.  If the argument is null, then get the string value from the
 * current context node.
 *
 * @param xctxt Runtime XPath context.
 *
 * @return The string value of the first argument, or the string value of the
 *         current context node if the first argument is null.
 *
 * @throws javax.xml.transform.TransformerException if an error occurs while
 *                                   executing the argument expression.
 */
protected XMLString getArg0AsString(XPathContext xctxt)
        throws javax.xml.transform.TransformerException
{
  if(null == m_arg0)
  {
    int currentNode = xctxt.getCurrentNode();
    if(DTM.NULL == currentNode)
      return XString.EMPTYSTRING;
    else
    {
      DTM dtm = xctxt.getDTM(currentNode);
      return dtm.getStringValue(currentNode);
    }
    
  }
  else
    return m_arg0.execute(xctxt).xstr();   
}
 

import org.apache.xpath.XPathContext; //导入方法依赖的package包/类
/**
 * Execute the first argument expression that is expected to return a
 * number.  If the argument is null, then get the number value from the
 * current context node.
 *
 * @param xctxt Runtime XPath context.
 *
 * @return The number value of the first argument, or the number value of the
 *         current context node if the first argument is null.
 *
 * @throws javax.xml.transform.TransformerException if an error occurs while
 *                                   executing the argument expression.
 */
protected double getArg0AsNumber(XPathContext xctxt)
        throws javax.xml.transform.TransformerException
{

  if(null == m_arg0)
  {
    int currentNode = xctxt.getCurrentNode();
    if(DTM.NULL == currentNode)
      return 0;
    else
    {
      DTM dtm = xctxt.getDTM(currentNode);
      XMLString str = dtm.getStringValue(currentNode);
      return str.toDouble();
    }
    
  }
  else
    return m_arg0.execute(xctxt).num();
}
 

import org.apache.xpath.XPathContext; //导入方法依赖的package包/类
/**
 * Given a result tree fragment, walk the tree and
 * output it to the SerializationHandler.
 *
 * @param obj Result tree fragment object
 * @param support XPath context for the result tree fragment
 *
 * @throws org.xml.sax.SAXException
 */
public static void outputResultTreeFragment(
    SerializationHandler handler,
    XObject obj,
    XPathContext support)
    throws org.xml.sax.SAXException
{

    int doc = obj.rtf();
    DTM dtm = support.getDTM(doc);

    if (null != dtm)
    {
        for (int n = dtm.getFirstChild(doc);
            DTM.NULL != n;
            n = dtm.getNextSibling(n))
        {
            handler.flushPending();

            // I think. . . . This used to have a (true) arg
            // to flush prefixes, will that cause problems ???
            if (dtm.getNodeType(n) == DTM.ELEMENT_NODE
                    && dtm.getNamespaceURI(n) == null)
                handler.startPrefixMapping("", "");
            dtm.dispatchToEvents(n, handler);
        }
    }
}
 

import org.apache.xpath.XPathContext; //导入方法依赖的package包/类
/**
 * Given a 'from' pattern (ala xsl:number), a match pattern
 * and a context, find the first ancestor that matches the
 * pattern (including the context handed in).
 *
 * @param xctxt The XPath runtime state for this.
 * @param fromMatchPattern The ancestor must match this pattern.
 * @param countMatchPattern The ancestor must also match this pattern.
 * @param context The node that "." expresses.
 * @param namespaceContext The context in which namespaces in the
 * queries are supposed to be expanded.
 *
 * @return the first ancestor that matches the given pattern
 *
 * @throws javax.xml.transform.TransformerException
 */
int findAncestor(
        XPathContext xctxt, XPath fromMatchPattern, XPath countMatchPattern, 
        int context, ElemNumber namespaceContext)
          throws javax.xml.transform.TransformerException
{
  DTM dtm = xctxt.getDTM(context);
  while (DTM.NULL != context)
  {
    if (null != fromMatchPattern)
    {
      if (fromMatchPattern.getMatchScore(xctxt, context)
              != XPath.MATCH_SCORE_NONE)
      {

        //context = null;
        break;
      }
    }

    if (null != countMatchPattern)
    {
      if (countMatchPattern.getMatchScore(xctxt, context)
              != XPath.MATCH_SCORE_NONE)
      {
        break;
      }
    }

    context = dtm.getParent(context);
  }

  return context;
}
 

import org.apache.xpath.XPathContext; //导入方法依赖的package包/类
/**
 * Try and find a node that was previously counted. If found,
 * return a positive integer that corresponds to the count.
 *
 * @param support The XPath context to use
 * @param node The node to be counted.
 * 
 * @return The count of the node, or -1 if not found.
 */
int getPreviouslyCounted(XPathContext support, int node)
{

  int n = m_countNodes.size();

  m_countResult = 0;

  for (int i = n - 1; i >= 0; i--)
  {
    int countedNode = m_countNodes.elementAt(i);

    if (node == countedNode)
    {

      // Since the list is in backwards order, the count is 
      // how many are in the rest of the list.
      m_countResult = i + 1 + m_countNodesStartCount;

      break;
    }
    
    DTM dtm = support.getDTM(countedNode);

    // Try to see if the given node falls after the counted node...
    // if it does, don't keep searching backwards.
    if (dtm.isNodeAfter(countedNode, node))
      break;
  }

  return m_countResult;
}
 

import org.apache.xpath.XPathContext; //导入方法依赖的package包/类
/**
 * Execute the function.  The function must return
 * a valid object.
 * @param xctxt The current execution context.
 * @return A valid XObject.
 *
 * @throws javax.xml.transform.TransformerException
 */
public XObject execute(XPathContext xctxt) throws javax.xml.transform.TransformerException
{

  int context = getArg0AsNode(xctxt);
  
  String s;
  if(context != DTM.NULL)
  {
    DTM dtm = xctxt.getDTM(context);
    int t = dtm.getNodeType(context);
    if(t == DTM.ELEMENT_NODE)
    {
      s = dtm.getNamespaceURI(context);
    }
    else if(t == DTM.ATTRIBUTE_NODE)
    {

      // This function always returns an empty string for namespace nodes.
      // We check for those here.  Fix inspired by Davanum Srinivas.

      s = dtm.getNodeName(context);
      if(s.startsWith("xmlns:") || s.equals("xmlns"))
        return XString.EMPTYSTRING;

      s = dtm.getNamespaceURI(context);
    }
    else
      return XString.EMPTYSTRING;
  }
  else 
    return XString.EMPTYSTRING;
  
  return ((null == s) ? XString.EMPTYSTRING : new XString(s));
}
 

import org.apache.xpath.XPathContext; //导入方法依赖的package包/类
/**
   * Execute the function.  The function must return
   * a valid object.
   * @param xctxt The current execution context.
   * @return A valid XObject.
   *
   * @throws javax.xml.transform.TransformerException
   */
  public XObject execute(XPathContext xctxt) throws javax.xml.transform.TransformerException
  {

    int whereNode = getArg0AsNode(xctxt);
    String fileLocation = null;

    if (DTM.NULL != whereNode)
    {
      DTM dtm = xctxt.getDTM(whereNode);
      
      // %REVIEW%
      if (DTM.DOCUMENT_FRAGMENT_NODE ==  dtm.getNodeType(whereNode))
      {
        whereNode = dtm.getFirstChild(whereNode);
      }

      if (DTM.NULL != whereNode)
      {        
        fileLocation = dtm.getDocumentBaseURI();
//        int owner = dtm.getDocument();
//        fileLocation = xctxt.getSourceTreeManager().findURIFromDoc(owner);
      }
    }

    return new XString((null != fileLocation) ? fileLocation : "");
  }
 

import org.apache.xpath.XPathContext; //导入方法依赖的package包/类
/**
 * Return the first node out of the nodeset, if this expression is 
 * a nodeset expression.  This is the default implementation for 
 * nodesets.
 * <p>WARNING: Do not mutate this class from this function!</p>
 * @param xctxt The XPath runtime context.
 * @return the first node out of the nodeset, or DTM.NULL.
 */
public int asNode(XPathContext xctxt)
  throws javax.xml.transform.TransformerException
{
  int current = xctxt.getCurrentNode();
  
  DTM dtm = xctxt.getDTM(current);
  
  return dtm.getFirstChild(current);
}
 

import org.apache.xpath.XPathContext; //导入方法依赖的package包/类
/**
 * Execute the function.  The function must return
 * a valid object.
 * @param xctxt The current execution context.
 * @return A valid XObject.
 *
 * @throws javax.xml.transform.TransformerException
 */
public XObject execute(XPathContext xctxt) throws javax.xml.transform.TransformerException
{

  String lang = m_arg0.execute(xctxt).str();
  int parent = xctxt.getCurrentNode();
  boolean isLang = false;
  DTM dtm = xctxt.getDTM(parent);

  while (DTM.NULL != parent)
  {
    if (DTM.ELEMENT_NODE == dtm.getNodeType(parent))
    {
      int langAttr = dtm.getAttributeNode(parent, "http://www.w3.org/XML/1998/namespace", "lang");

      if (DTM.NULL != langAttr)
      {
        String langVal = dtm.getNodeValue(langAttr);
        // %OPT%
        if (langVal.toLowerCase().startsWith(lang.toLowerCase()))
        {
          int valLen = lang.length();

          if ((langVal.length() == valLen)
                  || (langVal.charAt(valLen) == '-'))
          {
            isLang = true;
          }
        }

        break;
      }
    }

    parent = dtm.getParent(parent);
  }

  return isLang ? XBoolean.S_TRUE : XBoolean.S_FALSE;
}
 

import org.apache.xpath.XPathContext; //导入方法依赖的package包/类
/**
 * Execute the function.  The function must return
 * a valid object.
 * @param xctxt The current execution context.
 * @return A valid XObject.
 *
 * @throws javax.xml.transform.TransformerException
 */
public XObject execute(XPathContext xctxt) throws javax.xml.transform.TransformerException
{

  int context = getArg0AsNode(xctxt);
  if(DTM.NULL == context)
    return XString.EMPTYSTRING;
  DTM dtm = xctxt.getDTM(context);
  String s = (context != DTM.NULL) ? dtm.getLocalName(context) : "";
  if(s.startsWith("#") || s.equals("xmlns"))
    return XString.EMPTYSTRING;

  return new XString(s);
}