Java XPathContext.getOwnerObject方法代码示例

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
{
  if (xctxt.isSecureProcessing())
    throw new javax.xml.transform.TransformerException(
      XPATHMessages.createXPATHMessage(
        XPATHErrorResources.ER_EXTENSION_FUNCTION_CANNOT_BE_INVOKED,
        new Object[] {toString()}));
    
  XObject result;
  Vector argVec = new Vector();
  int nArgs = m_argVec.size();

  for (int i = 0; i < nArgs; i++)
  {
    Expression arg = (Expression) m_argVec.elementAt(i);
    
    XObject xobj = arg.execute(xctxt);
    /*
     * Should cache the arguments for func:function
     */
    xobj.allowDetachToRelease(false); 
    argVec.addElement(xobj);
  }
  //dml
  ExtensionsProvider extProvider = (ExtensionsProvider)xctxt.getOwnerObject();
  Object val = extProvider.extFunction(this, argVec);

  if (null != val)
  {
    result = XObject.create(val, xctxt);
  }
  else
  {
    result = new XNull();
  }

  return result;
}
 

import org.apache.xpath.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
 */
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 (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 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 prefix;
  String namespace;
  String methName;

  String fullName = m_arg0.execute(xctxt).str();
  int indexOfNSSep = fullName.indexOf(':');

  if (indexOfNSSep < 0)
  {
    prefix = "";
    namespace = Constants.S_XSLNAMESPACEURL;
    methName = fullName;
  }
  else
  {
    prefix = fullName.substring(0, indexOfNSSep);
    namespace = xctxt.getNamespaceContext().getNamespaceForPrefix(prefix);
    if (null == namespace)
      return XBoolean.S_FALSE;
    methName= fullName.substring(indexOfNSSep + 1);
  }

  if (namespace.equals(Constants.S_XSLNAMESPACEURL)
  ||  namespace.equals(Constants.S_BUILTIN_EXTENSIONS_URL))
  {
    try
    {
      TransformerImpl transformer = (TransformerImpl) xctxt.getOwnerObject();
      return transformer.getStylesheet().getAvailableElements().containsKey(
                                                          new QName(namespace, methName))
             ? XBoolean.S_TRUE : XBoolean.S_FALSE;
    }
    catch (Exception e)
    {
      return XBoolean.S_FALSE;
    }
  }
  else
  {
    //dml
    ExtensionsProvider extProvider = (ExtensionsProvider)xctxt.getOwnerObject();
    return extProvider.elementAvailable(namespace, methName)
           ? XBoolean.S_TRUE : XBoolean.S_FALSE;
  }
}