protected TransformResults Transform(CancellationToken cancellationToken, DataSchema dataSchema, TransformResults input,
TransformStack transformStack)
{
if (transformStack == null || transformStack.StackIndex >= transformStack.RowTransforms.Count)
{
return(input);
}
cancellationToken.ThrowIfCancellationRequested();
if (transformStack.Predecessor != null)
{
input = Transform(cancellationToken, dataSchema, input, transformStack.Predecessor);
}
var filter = transformStack.CurrentTransform as RowFilter;
if (filter != null)
{
var filteredRows = new PivotedRows(Filter(cancellationToken, dataSchema, filter, input.PivotedRows),
input.PivotedRows.ItemProperties);
filteredRows = Sort(cancellationToken, dataSchema, filter, filteredRows);
return(new TransformResults(input, filter, filteredRows));
}
var pivotSpec = transformStack.CurrentTransform as PivotSpec;
if (pivotSpec != null)
{
var pivotedRows = GroupAndTotaler.GroupAndTotal(cancellationToken, dataSchema, pivotSpec, input.PivotedRows);
return(new TransformResults(input, pivotSpec, pivotedRows));
}
return(input);
}
public static PivotedRows GroupAndTotal(CancellationToken cancellationToken, DataSchema dataSchema,
PivotSpec pivotSpec, PivotedRows input)
{
if (pivotSpec.IsEmpty)
{
return(input);
}
var groupAndTotaller = new GroupAndTotaler(cancellationToken, dataSchema, pivotSpec, input.ItemProperties);
var newProperties = new List <DataPropertyDescriptor>();
var newRows = ImmutableList.ValueOf(groupAndTotaller.GroupAndTotal(input.RowItems, newProperties));
return(new PivotedRows(newRows, newProperties));
}