public void BeginTransaction(DataPreprocessingChangedEventType type)
{
if (IsFiltered)
{
throw new InvalidOperationException("Transaction not possible while data is filtered");
}
originalData.BeginTransaction(type);
}
public bool ApplyTransformations(IEnumerable <ITransformation> transformations, bool preserveColumns, out string errorMsg)
{
bool success = false;
errorMsg = string.Empty;
preprocessingData.BeginTransaction(DataPreprocessingChangedEventType.Transformation);
try {
var doubleTransformations = transformations.OfType <Transformation <double> >().ToList();
if (preserveColumns)
{
PreserveColumns(doubleTransformations);
}
// all transformations are performed inplace. no creation of new columns for transformations
ApplyDoubleTranformationsInplace(doubleTransformations, preserveColumns, out success, out errorMsg);
if (preserveColumns)
{
RenameTransformedColumsAndRestorePreservedColumns(doubleTransformations);
RenameTransformationColumnParameter(doubleTransformations);
InsertCopyColumTransformations(doubleTransformations);
originalColumns.Clear();
renamedColumns.Clear();
}
// only accept changes if everything was successful
if (!success)
{
preprocessingData.Undo();
}
} catch (Exception e) {
preprocessingData.Undo();
if (string.IsNullOrEmpty(errorMsg))
{
errorMsg = e.Message;
}
} finally {
preprocessingData.EndTransaction();
}
return(success);
}