/*
* Recursive stream printer for displaying a stream to the user.
*/
public static string dumpStream(IStreamContainer s, int indent)
{
string pad = getSpaces(indent);
string ret = pad + "(Dumping stream)\n";
ISDTField e;
while ((e = s.GetNext()) != null)
{
ret += pad + string.Format("[Type={0}, Val={1}]\n", e.Type, e.Value);
if (e.Type == SDTFieldType.MAP)
{
ret += dumpMap((IMapContainer)e.Value, indent + 4);
}
else if (e.Type == SDTFieldType.STREAM)
{
ret += dumpStream((IStreamContainer)e.Value, indent + 4);
}
}
s.Rewind();
return(ret);
}
/// <summary>
/// Computes the results and stores it in a reply message
/// </summary>
/// <param name="operation"></param>
/// <param name="leftOperand"></param>
/// <param name="rightOperand"></param>
/// <returns></returns>
private IMessage ProcessArithmeticExpression(short operation, Int32 leftOperand, Int32 rightOperand)
{
// Create the reply message
IMessage replyMessage = ContextFactory.Instance.CreateMessage();
replyMessage.DeliveryMode = MessageDeliveryMode.Direct;
IStreamContainer stream = SDTUtils.CreateStream(replyMessage, 256);
double? result = null;
try
{
switch ((int)operation)
{
case (int)Operation.DIVIDE:
result = (double)((double)leftOperand / (double)rightOperand);
break;
case (int)Operation.MINUS:
result = (double)(leftOperand - rightOperand);
break;
case (int)Operation.PLUS:
result = (double)(leftOperand + rightOperand);
break;
case (int)Operation.TIMES:
result = (double)(leftOperand * rightOperand);
break;
default:
result = null;
break;
}
if (result == null)
{
stream.AddBool(false);
}
else
{
double val = result.Value;
if (double.IsNaN(val) || double.IsInfinity(val))
{
stream.AddBool(false);
}
else
{
stream.AddBool(true);
stream.AddDouble(val);
}
}
} catch (Exception) {
stream.Rewind();
stream.AddBool(false);
}
Operation opEnum = (Operation)((int)operation);
if (Enum.IsDefined(typeof(Operation), (Int32)operation))
{
Console.WriteLine(ARITHMETIC_EXPRESSION, leftOperand, opEnum, rightOperand,
(result == null ? "operation failed" : result.ToString()));
}
else
{
Console.WriteLine(ARITHMETIC_EXPRESSION, leftOperand, "UNKNOWN", rightOperand,
(result == null ? "operation failed" : result.ToString()));
}
return(replyMessage);
}