//
// The operand needs to use the number function
// to covert to numbers
internal NumericExpr(Operator.Op op, IQuery opnd1, IQuery opnd2)
{
if (opnd1.ReturnType() != XPathResultType.Number)
{
this.opnd1 = new NumberFunctions(opnd1);
}
else
{
this.opnd1 = opnd1;
}
if (opnd2 != null && (opnd2.ReturnType() != XPathResultType.Number))
{
this.opnd2 = new NumberFunctions(opnd2);
}
else
{
this.opnd2 = opnd2;
}
this.op = op;
}
//
// The operand needs to use the number function
// to covert to numbers
internal NumericExpr(Operator.Op op, IQuery opnd1, IQuery opnd2) {
if (opnd1.ReturnType() != XPathResultType.Number) {
this.opnd1= new NumberFunctions(opnd1);
}
else {
this.opnd1 = opnd1;
}
if (opnd2 != null && (opnd2.ReturnType() != XPathResultType.Number)) {
this.opnd2= new NumberFunctions(opnd2);
}
else{
this.opnd2 = opnd2;
}
this.op= op;
}
bool CompareAsBoolean(XPathReader reader)
{
object opndVar1, opndVar2;
bool b1, b2;
opndVar1 = this.opnd1.GetValue(reader);
opndVar2 = this.opnd2.GetValue(reader);
if (opnd1.ReturnType() == XPathResultType.NodeSet)
{
b1 = (opndVar1 != null);
}
else
{
b1 = Convert.ToBoolean(opndVar1);
}
if (opnd1.ReturnType() == XPathResultType.NodeSet)
{
b2 = (opndVar2 != null);
}
else
{
b2 = Convert.ToBoolean(opndVar2);
}
if (op > Operator.Op.GE)
{
if ((Operator.Op.EQ == op && b1 == b2) || (Operator.Op.NE == op && b1 != b2))
{
return(true);
}
else
{
return(false);
}
}
else
{
//need to covert the string to the number and compare the numbers.
double n1 = 0, n2 = 0;
try {
n1 = Convert.ToDouble(b1);
n2 = Convert.ToDouble(b2);
} catch {
return(false);
}
switch (op)
{
case Operator.Op.LT: if (n1 < n2)
{
return(true);
}
break;
case Operator.Op.GT: if (n1 > n2)
{
return(true);
}
break;
case Operator.Op.LE: if (n1 <= n2)
{
return(true);
}
break;
case Operator.Op.GE: if (n1 >= n2)
{
return(true);
}
break;
}
}
return(false);
}