public override bool MoveNext()
{
while (iterator.MoveNext())
{
bool match = false;
switch (predicate.ReturnType)
{
case XPathResultType.String:
case XPathResultType.NodeSet:
case XPathResultType.Boolean:
{
match = (bool)predicate.EvaluateAs(iterator, XPathResultType.Boolean);
}
break;
case XPathResultType.Number:
{
match = (iterator.CurrentPosition) == (double)predicate.Evaluate(iterator);
}
break;
default:
{
throw new NotSupportedException("TODO: " + predicate.ReturnType);
}
break;
}
if (match)
{
pos++;
return(true);
}
}
return(false);
}
public override bool MoveNext()
{
//TODO: depth first traversal - fix when doing Evaluate
while (rhs == null || !rhs.MoveNext())
{
if (!lhs.MoveNext())
{
return(false);
}
rhs = (XPathBaseIterator)expr.Evaluate(lhs);
}
pos++;
// We have already done an rhs.MoveNext()
return(true);
}
public override bool MoveNext()
{
// TODO: investigate removing these variables
bool movedRight = false;
bool movedLeft = false;
if (!moveLeft && !moveRight)
{
return(false);
}
if (moveLeft)
{
movedLeft = left.MoveNext();
}
if (moveRight)
{
movedRight = right.MoveNext();
}
if (moveLeft && !movedLeft && moveRight && !movedRight)
{
return(false);
}
if (moveLeft && !movedLeft)
{
moveLeft = false;
current = right.Current.Clone();
pos++;
return(true);
}
if (moveRight && !movedRight)
{
/* from next time, don't move right */
moveRight = false;
current = left.Current.Clone();
pos++;
return(true);
}
// both moves were successful or we had leftover nodes from
// one side now we need to chose which side to output first
XmlNodeOrder order = left.Current.ComparePosition(right.Current);
switch (order)
{
case XmlNodeOrder.Same:
{
moveRight = moveLeft = true;
current = left.Current.Clone();
pos++;
return(true);
}
break;
case XmlNodeOrder.Before:
case XmlNodeOrder.Unknown:
{
moveLeft = true;
moveRight = false;
current = left.Current.Clone();
pos++;
return(true);
}
break;
case XmlNodeOrder.After:
{
moveLeft = false;
moveRight = true;
current = right.Current.Clone();
pos++;
return(true);
}
break;
default:
{
throw new XPathException("Could understand node relationship : " + order.ToString(), null);
}
break;
}
return(false);
}