public override bool evalBoolean(VTDNav vn)
{
// TODO Auto-generated method stub
if (cached)
{
return(eb);
}
else
{
eb = e.evalBoolean(vn);
return(eb);
}
}
/*
* (non-Javadoc)
*
* @see com.ximpleware.xpath.Expr#evalBoolean(com.ximpleware.VTDNav)
*/
public override bool evalBoolean(VTDNav vn)
{
if (e.Boolean)
{
return(e.evalBoolean(vn));
}
if (e.NodeSet)
{
bool a = false;
vn.push2();
// record teh stack size
int size = vn.contextStack2.size;
try
{
a = (evalNodeSet(vn) != -1);
}
catch (System.Exception ee)
{
}
//rewind stack
vn.contextStack2.size = size;
reset(vn);
vn.pop2();
return(a);
}
if (e.Numerical)
{
double dval = e.evalNumber(vn);
if (dval == 0.0 || System.Double.IsNaN(dval))
{
return(false);
}
return(true);
}
String s = e.evalString(vn);
if (s == null || s.Length == 0)
{
return(false);
}
return(true);
}
/// <summary>
/// evalXPathToBoolean() evaluates the xpath expression to a boolean
/// </summary>
/// <returns> return the result as a boolean</returns>
public bool evalXPathToBoolean()
{
return(xpe.evalBoolean(vn));
}