public TModel Execute(TModel newValue, TModel lastValue)
{
if (null == newValue)
{
throw new ArgumentNullException(nameof(newValue));
}
if (null == lastValue)
{
throw new ArgumentNullException(nameof(lastValue));
}
TModel value = newValue;
var filters = (IList <IStreamFilter <TModel> >)Filters;
for (int i = 0; i < filters.Count; i++)
{
IStreamFilter <TModel> filter = filters[i];
value = filter.Execute(value, lastValue);
if (value == null)
{
break;
}
}
return(value);
}
private TModel Filter(TModel model)
{
if (null == model)
{
return(null);
}
ThrowIfModelHasInvalidId(model);
IStreamFilter <TModel> filter = _factory.Filter;
TModel filtered = filter.Execute(model, _observable.Value);
if (null == filtered)
{
return(null);
}
ThrowIfModelHasInvalidId(filtered);
return(filtered);
}