Java XPathContext.getDTMManager方法代码示例

import com.sun.org.apache.xpath.internal.XPathContext; //导入方法依赖的package包/类
/**
 * The dyn:evaluate function evaluates a string as an XPath expression and returns
 * the resulting value, which might be a boolean, number, string, node set, result
 * tree fragment or external object. The sole argument is the string to be evaluated.
 * <p>
 * If the expression string passed as the second argument is an invalid XPath
 * expression (including an empty string), this function returns an empty node set.
 * <p>
 * You should only use this function if the expression must be constructed dynamically,
 * otherwise it is much more efficient to use the expression literally.
 *
 * @param myContext The ExpressionContext passed by the extension processor
 * @param xpathExpr The XPath expression string
 *
 * @return The evaluation result
 */
public static XObject evaluate(ExpressionContext myContext, String xpathExpr)
  throws SAXNotSupportedException
{
  if (myContext instanceof XPathContext.XPathExpressionContext)
  {
    XPathContext xctxt = null;
    try
    {
      xctxt = ((XPathContext.XPathExpressionContext) myContext).getXPathContext();
      XPath dynamicXPath = new XPath(xpathExpr, xctxt.getSAXLocator(),
                                     xctxt.getNamespaceContext(),
                                     XPath.SELECT);

      return dynamicXPath.execute(xctxt, myContext.getContextNode(),
                                  xctxt.getNamespaceContext());
    }
    catch (TransformerException e)
    {
      return new XNodeSet(xctxt.getDTMManager());
    }
  }
  else
    throw new SAXNotSupportedException(XSLMessages.createMessage(XSLTErrorResources.ER_INVALID_CONTEXT_PASSED, new Object[]{myContext })); //"Invalid context passed to evaluate "
}
 

import com.sun.org.apache.xpath.internal.XPathContext; //导入方法依赖的package包/类
/**
 * @see DTMIterator#setRoot(int, Object)
 */
public void setRoot(int nodeHandle, Object environment)
{
      // If root is DTM.NULL, then something's wrong with the context
      if (nodeHandle == DTM.NULL)
      {
          throw new RuntimeException("Unable to evaluate expression using " +
                  "this context");
      }

      if(null != m_iter)
      {
              XPathContext xctxt = (XPathContext)environment;
              m_dtmMgr = xctxt.getDTMManager();
              m_iter.setRoot(nodeHandle, environment);
              if(!m_iter.isDocOrdered())
              {
                      if(!hasCache())
                              setShouldCacheNodes(true);
                      runTo(-1);
                      m_next=0;
              }
      }
      else
              assertion(false, "Can not setRoot on a non-iterated NodeSequence!");
}
 

import com.sun.org.apache.xpath.internal.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
{

  SubContextList subContextList = xctxt.getCurrentNodeList();
  int currentNode = DTM.NULL;

  if (null != subContextList) {
      if (subContextList instanceof PredicatedNodeTest) {
          LocPathIterator iter = ((PredicatedNodeTest)subContextList)
                                                        .getLocPathIterator();
          currentNode = iter.getCurrentContextNode();
       } else if(subContextList instanceof StepPattern) {
         throw new RuntimeException(XSLMessages.createMessage(
            XSLTErrorResources.ER_PROCESSOR_ERROR,null));
       }
  } else {
      // not predicate => ContextNode == CurrentNode
      currentNode = xctxt.getContextNode();
  }
  return new XNodeSet(currentNode, xctxt.getDTMManager());
}
 

import com.sun.org.apache.xpath.internal.XPathContext; //导入方法依赖的package包/类
public XNodeSetForDOM(NodeList nodeList, XPathContext xctxt)
{
  m_dtmMgr = xctxt.getDTMManager();
  m_origObj = nodeList;

  // JKESS 20020514: Longer-term solution is to force
  // folks to request length through an accessor, so we can defer this
  // retrieval... but that requires an API change.
  // m_obj=new com.sun.org.apache.xpath.internal.NodeSetDTM(nodeList, xctxt);
  com.sun.org.apache.xpath.internal.NodeSetDTM nsdtm=new com.sun.org.apache.xpath.internal.NodeSetDTM(nodeList, xctxt);
  m_last=nsdtm.getLength();
  setObject(nsdtm);
}
 

import com.sun.org.apache.xpath.internal.XPathContext; //导入方法依赖的package包/类
/**
 * The here function returns a node-set containing the attribute or
 * processing instruction node or the parent element of the text node
 * that directly bears the XPath expression.  This expression results
 * in an error if the containing XPath expression does not appear in the
 * same XML document against which the XPath expression is being evaluated.
 *
 * @param xctxt
 * @return the xobject
 * @throws javax.xml.transform.TransformerException
 */
@Override
public XObject execute(XPathContext xctxt)
    throws javax.xml.transform.TransformerException {

    Node xpathOwnerNode = (Node) xctxt.getOwnerObject();

    if (xpathOwnerNode == null) {
        return null;
    }

    int xpathOwnerNodeDTM = xctxt.getDTMHandleFromNode(xpathOwnerNode);

    int currentNode = xctxt.getCurrentNode();
    DTM dtm = xctxt.getDTM(currentNode);
    int docContext = dtm.getDocument();

    if (DTM.NULL == docContext) {
        error(xctxt, XPATHErrorResources.ER_CONTEXT_HAS_NO_OWNERDOC, null);
    }

    {
        // check whether currentNode and the node containing the XPath expression
        // are in the same document
        Document currentDoc =
            XMLUtils.getOwnerDocument(dtm.getNode(currentNode));
        Document xpathOwnerDoc = XMLUtils.getOwnerDocument(xpathOwnerNode);

        if (currentDoc != xpathOwnerDoc) {
            throw new TransformerException(I18n.translate("xpath.funcHere.documentsDiffer"));
        }
    }

    XNodeSet nodes = new XNodeSet(xctxt.getDTMManager());
    NodeSetDTM nodeSet = nodes.mutableNodeset();

    {
        int hereNode = DTM.NULL;

        switch (dtm.getNodeType(xpathOwnerNodeDTM)) {

        case Node.ATTRIBUTE_NODE :
        case Node.PROCESSING_INSTRUCTION_NODE : {
            // returns a node-set containing the attribute /  processing instruction node
            hereNode = xpathOwnerNodeDTM;

            nodeSet.addNode(hereNode);

            break;
        }
        case Node.TEXT_NODE : {
            // returns a node-set containing the parent element of the
            // text node that directly bears the XPath expression
            hereNode = dtm.getParent(xpathOwnerNodeDTM);

            nodeSet.addNode(hereNode);

            break;
        }
        default :
            break;
        }
    }

    /** $todo$ Do I have to do this detach() call? */
    nodeSet.detach();

    return nodes;
}
 

import com.sun.org.apache.xpath.internal.XPathContext; //导入方法依赖的package包/类
@Override
public XObject execute(XPathContext xctxt) throws TransformerException {
    Node xpathOwnerNode = (Node)xctxt.getOwnerObject();
    if (xpathOwnerNode == null) {
        return null;
    }

    int xpathOwnerNodeDTM = xctxt.getDTMHandleFromNode(xpathOwnerNode);
    int currentNode = xctxt.getCurrentNode();
    DTM dtm = xctxt.getDTM(currentNode);
    int docContext = dtm.getDocument();

    if (docContext == DTM.NULL) {
        error(xctxt, XPATHErrorResources.ER_CONTEXT_HAS_NO_OWNERDOC, null);
    }

    // check whether currentNode and the node containing the XPath
    // expression are in the same document
    Document currentDoc = getOwnerDocument(dtm.getNode(currentNode));
    Document xpathOwnerDoc = getOwnerDocument(xpathOwnerNode);

    if (currentDoc != xpathOwnerDoc) {
        throw new TransformerException("Owner documents differ");
    }

    XNodeSet nodes = new XNodeSet(xctxt.getDTMManager());
    NodeSetDTM nodeSet = nodes.mutableNodeset();

    int hereNode = DTM.NULL;

    switch (dtm.getNodeType(xpathOwnerNodeDTM)) {

        case Node.ATTRIBUTE_NODE:
        case Node.PROCESSING_INSTRUCTION_NODE: {
            // returns a node-set containing the attribute /  processing
            // instruction node
            hereNode = xpathOwnerNodeDTM;
            nodeSet.addNode(hereNode);
            break;
        }
        case Node.TEXT_NODE : {
            // returns a node-set containing the parent element of the
            // text node that directly bears the XPath expression
            hereNode = dtm.getParent(xpathOwnerNodeDTM);
            nodeSet.addNode(hereNode);
            break;
        }
        default :
            break;
    }

    /** $todo$ Do I have to do this detach() call? */
    nodeSet.detach();

    return nodes;
}