private void OnPropertyChanged(object sender, PropertyChangedEventArgs e)
{
switch (e.PropertyName)
{
case nameof(Filter.IsChecked):
CombinationFilter.CalculateSummary(Trades);
break;
case nameof(Filter.ArgumentValue):
var filter = sender as Filter;
if (filter != null)
{
// Which vm does this correspond with?
var vm = Filters.SingleOrDefault(x => x.Filter == filter);
if (vm != null)
{
vm.CalculateSummary(Trades);
}
// Update combination filter as well
CombinationFilter.CalculateSummary(Trades);
}
break;
}
}
public void CombinationFilter_OrOperator_GetPredicate_FiltersToExpectedResults()
{
var filter1 = new NumericRangeFilter(5, 10);
var filter2 = new NumericRangeFilter(8, 15);
var filter = new CombinationFilter <NumericRangeFilter>(new[] { filter1, filter2 }, CombinationOperator.Any);
var values = new[] { 1, 3, 5, 9, 11 };
var expectedFilteredValues = new[] { 5, 9, 11 };
var filterPredicate = filter.GetPredicate <NumericRangeFilter, int>();
var filteredValues = values.Where(filterPredicate);
Assert.Equal(expectedFilteredValues, filteredValues);
}
public void ComplexFilter_IsMatch_FiltersToExpectedResults()
{
var filter5To10 = new NumericRangeFilter(5, 10);
var filter8To15 = new NumericRangeFilter(8, 15);
var filter5To10Or8To15 = new CombinationFilter <NumericRangeFilter>(new[] { filter5To10, filter8To15 }, CombinationOperator.Any);
var filter9To12 = new NumericRangeFilter(9, 12);
var filter = new CombinationFilter <NumericRangeFilter>(new IFilterNode <NumericRangeFilter>[] { filter5To10Or8To15, filter9To12 }, CombinationOperator.All);
var values = new[] { 1, 3, 5, 9, 11 };
var expectedFilteredValues = new[] { 9, 11 };
var filteredValues = values.Where(v => filter.IsMatch(v));
Assert.Equal(expectedFilteredValues, filteredValues);
}
public void ComplexFilter_GetPredicate_FiltersToExpectedResults()
{
var filter5To10 = new NumericRangeFilter(5, 10);
var filter8To15 = new NumericRangeFilter(8, 15);
var filter5To10And8To15 = new CombinationFilter <NumericRangeFilter>(new[] { filter5To10, filter8To15 }, CombinationOperator.Any);
var filter9To12 = new NumericRangeFilter(9, 12);
var filter = new CombinationFilter <NumericRangeFilter>(new IFilterNode <NumericRangeFilter>[] { filter5To10And8To15, filter9To12 }, CombinationOperator.All);
var values = new[] { 1, 3, 5, 9, 11 };
var expectedFilteredValues = new[] { 9, 11 };
var filterPredicate = filter.GetPredicate <NumericRangeFilter, int>();
var filteredValues = values.Where(filterPredicate);
Assert.Equal(expectedFilteredValues, filteredValues);
}
public void Aggregate_ReturnsExpectedResult_WhenComputingLengthOfLongestInterval()
{
var filter5To10 = new NumericRangeFilter(5, 10);
var filter8To15 = new NumericRangeFilter(8, 15);
var filter5To10Or8To15 = new CombinationFilter <NumericRangeFilter>(new[] { filter5To10, filter8To15 }, CombinationOperator.Any);
var filter9To12 = new NumericRangeFilter(9, 12);
var filter = new CombinationFilter <NumericRangeFilter>(new IFilterNode <NumericRangeFilter>[] { filter5To10Or8To15, filter9To12 }, CombinationOperator.All);
// Reduce the filter to get the length of the longest interval
var result = filter.Aggregate <double>(
(lengths, _) => lengths.Max(),
length => double.PositiveInfinity,
f => f.UpperBound - f.LowerBound);
// Max is 15 - 8
Assert.Equal(7, result);
}
public void Map_ReturnsCorrectStructureAndValues()
{
var filter5To10 = new NumericRangeFilter(5, 10);
var filter8To15 = new NumericRangeFilter(8, 15);
var filter5To10Or8To15 = new CombinationFilter <NumericRangeFilter>(new[] { filter5To10, filter8To15 }, CombinationOperator.Any);
var filter9To12 = new NumericRangeFilter(9, 12);
var filter = new CombinationFilter <NumericRangeFilter>(new IFilterNode <NumericRangeFilter>[] { filter5To10Or8To15, filter9To12 }, CombinationOperator.All);
var result = filter.Map(
f =>
{
var newLowerBound = f.LowerBound + 1;
var newUpperBound = f.UpperBound - 1;
return(new NumericRangeFilter(newLowerBound, newUpperBound));
});
var filter6To9 = new NumericRangeFilter(6, 9);
var filter9To14 = new NumericRangeFilter(9, 14);
var filter6To9Or9To14 = new CombinationFilter <NumericRangeFilter>(new[] { filter6To9, filter9To14 }, CombinationOperator.Any);
var filter10To11 = new NumericRangeFilter(10, 11);
var expectedFilter = new CombinationFilter <NumericRangeFilter>(new IFilterNode <NumericRangeFilter>[] { filter6To9Or9To14, filter10To11 }, CombinationOperator.All);
Assert.Equal(expectedFilter, result, EqualityComparer <IFilterNode> .Default);
}
public void GetPartial_Example()
{
// All the numbers from -5 to 10, EXCEPT numbers from 2 to 6
var filter = new CombinationFilter <NumericRangeFilter>(new IFilterNode <NumericRangeFilter>[]
{
new NumericRangeFilter(-5, 10),
new InvertedFilter <NumericRangeFilter>(new NumericRangeFilter(2, 6)),
}, CombinationOperator.All);
// Exclude filters with negative values
var partialFilter = filter.GetPartial(f => f.LowerBound >= 0);
var positiveValues = new[] { 1, 3, 5, 7, 12 };
var prefilteredValues = positiveValues.Where(partialFilter.IsMatch).ToList();
Assert.Equal(new[] { 1, 7, 12 }, prefilteredValues);
var additionalValues = new[] { -7, -4, 11 };
var combinedValues = prefilteredValues.Concat(additionalValues);
var finalValues = combinedValues.Where(filter.IsMatch);
Assert.Equal(new[] { 1, 7, -4 }, finalValues);
}
