/// <summary>
/// Assign this CreateSummaryDelegate handler method to SummaryDescriptor.CreateSummaryMethod
/// </summary>
/// <param name="sd"></param>
/// <param name="record"></param>
/// <returns></returns>
public static ISummary CreateSummaryMethod(SummaryDescriptor sd, Record record)
{
object obj = sd.GetValue(record);
bool isNull = (obj == null || obj is DBNull);
if (isNull)
{
return(Empty);
}
else
{
int i = sd.Name.LastIndexOf('_') + 1;
string weightsCol = sd.Name.Substring(i);
object obj1 = record.GetValue(weightsCol);
if (obj1 == null)
{
throw new ArgumentException(string.Format("[{0}] not a column.", weightsCol));
}
double wgt = Convert.ToDouble(obj1);
double val = Convert.ToDouble(obj) * wgt;
return(new WeightedSummary(val, wgt));
}
}
/// <summary>
/// Assign this CreateSummaryDelegate handler method to SummaryDescriptor.CreateSummaryMethod
/// </summary>
/// <param name="sd"></param>
/// <param name="record"></param>
/// <returns></returns>
public static ISummary CreateSummaryMethod(SummaryDescriptor sd, Record record)
{
object obj = sd.GetValue(record);
bool isNull = (obj == null || obj is DBNull);
if (isNull)
{
return(Empty);
}
else
{
double val = Convert.ToDouble(obj);
return(new TotalSummary(val));
}
}
public static ISummary CreateSummaryMethod(SummaryDescriptor sd, Record record)
{
object obj = sd.GetValue(record);
bool isNull = (obj == null || obj is DBNull);
if (isNull)
{
return(new DistinctInt32CountSummary(new Int32[0]));
}
else
{
Int32 val = Convert.ToInt32(obj);
return(new DistinctInt32CountSummary(new Int32[] { val }));
}
}
public static ISummary CreateSummaryMethod(SummaryDescriptor sd, Record record)
{
object obj = sd.GetValue(record);
bool isNull = (obj == null || obj is DBNull) ||
(obj is double) && double.IsNaN((double)obj);
// could also be double.NaN... which is also treated as null
if (isNull)
{
return(new StatisticsSummary(new double[0], 0)); // { double.NaN }, 1);
}
else
{
double val = Convert.ToDouble(obj);
return(new StatisticsSummary(new double[] { val }, 1));
}
}