protected override void MergeOverride(AggregateValue childAggregate)
{
if (this.Function == null)
{
return;
}
var userAggregate = childAggregate as UserAggregateValue;
if (userAggregate == null)
{
return;
}
this.Function.Merge(userAggregate.Function);
}
internal void MergeCore(AggregateValue childAggregate)
{
try
{
if (childAggregate.error != null)
{
this.error = childAggregate.error;
}
else
{
this.MergeOverride(childAggregate);
}
}
catch
{
this.error = AggregateValue.Error;
}
}
/// <summary>
/// Compares two <see cref="IGroup"/>s based on their grand totals.
/// </summary>
/// <param name="results">The current aggregate results.</param>
/// <param name="left">The first <see cref="IGroup"/> to compare.</param>
/// <param name="right">The second <see cref="IGroup"/> to compare.</param>
/// <param name="axis">Identifies if the groups are in <see cref="DataAxis.Rows"/> or <see cref="DataAxis.Columns"/>.</param>
/// <returns>
/// A signed integer that indicates the relative values of x and y, as shown in the following table.
/// <para>Value Meaning Less than zero x is less than y.</para>
/// <para>Zero x equals y.</para>
/// <para>Greater than zero x is greater than y.</para>
/// </returns>
public override int CompareGroups(IAggregateResultProvider results, IGroup left, IGroup right, DataAxis axis)
{
Coordinate grandTotalCoordinateX;
Coordinate grandTotalCoordinateY;
if (axis == DataAxis.Rows)
{
grandTotalCoordinateX = new Coordinate(left, results.Root.ColumnGroup);
grandTotalCoordinateY = new Coordinate(right, results.Root.ColumnGroup);
}
else
{
grandTotalCoordinateX = new Coordinate(results.Root.RowGroup, left);
grandTotalCoordinateY = new Coordinate(results.Root.RowGroup, right);
}
AggregateValue aggregateValueX = results.GetAggregateResult(this.AggregateIndex, grandTotalCoordinateX);
AggregateValue aggregateValueY = results.GetAggregateResult(this.AggregateIndex, grandTotalCoordinateY);
// TODO: Exception handling, Provide AggregateResults Comparer, Proper order on value-vs-null and null-vs-value cases
if (aggregateValueX != null && aggregateValueY != null)
{
object valueX = aggregateValueX.GetValue();
object valueY = aggregateValueY.GetValue();
IComparable comparableX = valueX as IComparable;
if (comparableX != null)
{
return(comparableX.CompareTo(valueY));
}
IComparable comparableY = valueY as IComparable;
if (comparableY != null)
{
return(-comparableY.CompareTo(valueX));
}
}
return(0);
}
/// <summary> /// Merge the results of an <see cref="AggregateValue"/> with the results in the current <see cref="AggregateValue"/> instance. /// </summary> /// <param name="childAggregate">The <see cref="AggregateValue"/> to merge.</param> protected abstract void MergeOverride(AggregateValue childAggregate);