org.apache.xpath.ExpressionNode Java Examples

/** 
 * Set the parent of this node.
 * @param n Must be a ElemTemplateElement.
 */
public void exprSetParent(ExpressionNode n)
{
	// This obviously requires that only a ElemTemplateElement can 
	// parent a node of this type.
	setParentElem((ElemTemplateElement)n);
}
 

/**
 * Tell if the expr param is contained within an xsl:param.
 */
protected boolean isParam(ExpressionNode expr)
{
	while(null != expr)
	{
		if(expr instanceof ElemTemplateElement)
			break;
		expr = expr.exprGetParent();
	}
	if(null != expr)
	{
		ElemTemplateElement ete = (ElemTemplateElement)expr;
		while(null != ete)
		{
			int type = ete.getXSLToken();
			switch(type)
			{
				case Constants.ELEMNAME_PARAMVARIABLE:
					return true;
				case Constants.ELEMNAME_TEMPLATE:
				case Constants.ELEMNAME_STYLESHEET:
					return false;
			}
			ete = ete.getParentElem();
		}
	}
	return false;
	
}
 

/**
 * From an XPath expression component, get the ElemTemplateElement 
 * owner.
 * 
 * @param expr Should be static expression with proper parentage.
 * @return Valid ElemTemplateElement, or throw a runtime exception 
 * if it is not found.
 */
protected ElemTemplateElement getElemFromExpression(Expression expr)
{
	ExpressionNode parent = expr.exprGetParent();
	while(null != parent)
	{
		if(parent instanceof ElemTemplateElement)
			return (ElemTemplateElement)parent;
		parent = parent.exprGetParent();
	}
	throw new RuntimeException(XSLMessages.createMessage(XSLTErrorResources.ER_ASSERT_NO_TEMPLATE_PARENT, null));
	// "Programmer's error! expr has no ElemTemplateElement parent!");
}
 

/**
 * Create an XRTreeFrag Object.
 *
 */
public XRTreeFrag(int root, XPathContext xctxt, ExpressionNode parent)
{
  super(null);
  exprSetParent(parent);
  initDTM(root, xctxt);    
}
 

/**
 * Set the parent node.
 * For an extension function, we also need to set the parent
 * node for all argument expressions.
 * 
 * @param n The parent node
 */
public void exprSetParent(ExpressionNode n) 
{
	
  super.exprSetParent(n);
    
  int nArgs = m_argVec.size();

  for (int i = 0; i < nArgs; i++)
  {
    Expression arg = (Expression) m_argVec.elementAt(i);

    arg.exprSetParent(n);
  }		
}
 

/**
 * Get the ExpressionNode parent of this node.
 */
public ExpressionNode exprGetParent()
{
	return getParentElem();
}
 

/** This method returns a child node.  The children are numbered
   from zero, left to right. */
public ExpressionNode exprGetChild(int i)
{
	return (ExpressionNode)item(i);
}
 

/** 
 * This method tells the node to add its argument to the node's
 * list of children. 
 * @param n Must be a ElemTemplateElement. 
 */
public void exprAddChild(ExpressionNode n, int i)
{
	appendChild((ElemTemplateElement)n);
}