Java Code Examples for org.apache.xpath.objects.XObject#allowDetachToRelease()

/**
 * Get the XObject representation of the variable.
 *
 * @param transformer non-null reference to the the current transform-time state.
 * @param sourceNode non-null reference to the <a href="http://www.w3.org/TR/xslt#dt-current-node">current source node</a>.
 *
 * @return the XObject representation of the variable.
 *
 * @throws TransformerException
 */
public XObject getValue(TransformerImpl transformer, int sourceNode)
        throws TransformerException
{

  XObject var;
  XPathContext xctxt = transformer.getXPathContext();

  xctxt.pushCurrentNode(sourceNode);

  try
  {
    if (null != m_selectPattern)
    {
      var = m_selectPattern.execute(xctxt, sourceNode, this);

      var.allowDetachToRelease(false);
    }
    else if (null == getFirstChildElem())
    {
      var = XString.EMPTYSTRING;
    }
    else
    {

      // Use result tree fragment
      int df = transformer.transformToRTF(this);

      var = new XRTreeFrag(df, xctxt, this);
    }
  }
  finally
  {
    xctxt.popCurrentNode();
  }

  return var;
}
 

/**
 * 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;
}
 

/**
 * Get the XObject representation of the variable.
 *
 * @param transformer non-null reference to the the current transform-time state.
 * @param sourceNode non-null reference to the <a href="http://www.w3.org/TR/xslt#dt-current-node">current source node</a>.
 *
 * @return the XObject representation of the variable.
 *
 * @throws TransformerException
 */
public XObject getValue(TransformerImpl transformer, int sourceNode)
        throws TransformerException
{

  XObject var;
  XPathContext xctxt = transformer.getXPathContext();

  xctxt.pushCurrentNode(sourceNode);
 
  try
  {
    if (null != m_selectPattern)
    {
      var = m_selectPattern.execute(xctxt, sourceNode, this);

      var.allowDetachToRelease(false);
    }
    else if (null == getFirstChildElem())
    {
      var = XString.EMPTYSTRING;
    }
    else
    {

      // Use result tree fragment.
      // Global variables may be deferred (see XUnresolvedVariable) and hence
      // need to be assigned to a different set of DTMs than local variables
      // so they aren't popped off the stack on return from a template.
      int df;

// Bugzilla 7118: A variable set via an RTF may create local
// variables during that computation. To keep them from overwriting
// variables at this level, push a new variable stack.
////// PROBLEM: This is provoking a variable-used-before-set
////// problem in parameters. Needs more study.
try
{
	//////////xctxt.getVarStack().link(0);
	if(m_parentNode instanceof Stylesheet) // Global variable
		df = transformer.transformToGlobalRTF(this);
	else
		df = transformer.transformToRTF(this);
  	}
finally{ 
	//////////////xctxt.getVarStack().unlink(); 
	}

      var = new XRTreeFrag(df, xctxt, this);
    }
  }
  finally
  {      
    xctxt.popCurrentNode();
  }

  return var;
}
 

/**
 * For support of literal objects in xpaths.
 *
 * @param xctxt The XPath execution context.
 *
 * @return This object.
 *
 * @throws javax.xml.transform.TransformerException
 */
public XObject execute(XPathContext xctxt) throws javax.xml.transform.TransformerException
{
	Expression expr = ((ElemVariable)m_obj).getSelect().getExpression();
  XObject xobj = expr.execute(xctxt);
  xobj.allowDetachToRelease(false);
  return xobj;
}