/*
* (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);
}
public override double evalNumber(VTDNav vn)
{
// TODO Auto-generated method stub
if (cached)
{
return(en);
}
else
{
cached = true;
en = e.evalNumber(vn);
return(en);
}
}
/// <summary>
/// evalXPathToNumber() evaluates the xpath expression to a double
/// </summary>
/// <returns>return the result as a double</returns>
public double evalXPathToNumber()
{
return(xpe.evalNumber(vn));
}
/// <summary>
///
/// </summary>
/// <param name="vn"></param>
/// <returns></returns>
public override double evalNumber(VTDNav vn)
{
if (e.NodeSet == false)
{
return(e.evalNumber(vn));
}
//double d;
double d = Double.NaN;
int a = 0x7fffffff, k = -1;
vn.push2();
int size = vn.contextStack2.size;
try
{
while ((k = evalNodeSet(vn)) != -1)
{
//a = evalNodeSet(vn);
if (k < a)
{
a = k;
}
}
if (a == 0x7fffffff)
{
a = -1;
}
if (a != -1)
{
int t = vn.getTokenType(a);
if (t == VTDNav.TOKEN_ATTR_NAME)
{
d = vn.parseDouble(a + 1);
}
else if (t == VTDNav.TOKEN_STARTING_TAG || t == VTDNav.TOKEN_DOCUMENT)
{
d = vn.XPathStringVal2Double(a);//Double.parseDouble(s);
}
else if (t == VTDNav.TOKEN_PI_NAME)
{
if (a + 1 < vn.vtdSize || vn.getTokenType(a + 1) == VTDNav.TOKEN_PI_VAL)
{
//s = vn.toString(a+1);
d = vn.parseDouble(a + 1);
}
}
else
{
d = vn.parseDouble(a);
}
}
}
catch (Exception ee)
{
}
vn.contextStack2.size = size;
reset(vn);
vn.pop2();
//return s;
return(d);
}