private int AddItemToGroup(GroupByKey key, int rowIndex, out bool notify)
{
notify = false;
List <int> rowsInGroup;
int groupedIndex;
if (_groupedRows.TryGetValue(key, out rowsInGroup))
{
groupedIndex = _keyPositions[key];
rowsInGroup.Add(rowIndex);
}
else
{
rowsInGroup = new List <int>();
groupedIndex = _groupedRows.AddWithIndex(key, rowsInGroup);
_keyPositions.Add(key, groupedIndex);
rowsInGroup.Add(rowIndex);
foreach (var aggregateColumn in _aggregateColumns)
{
aggregateColumn.AddField(groupedIndex);
}
notify = true;
// Make sure all the column values are sent too
foreach (var keyColumn in _keyColumns)
{
_updates.OnNext(TableUpdate.NewColumnUpdate(groupedIndex, (IReactiveColumn)keyColumn));
}
}
return(groupedIndex);
}
private bool RemoveItemFromGroup(List <int> @group, int rowIndex, GroupByKey key, int groupedIndex)
{
group.Remove(rowIndex);
var notifyRequired = RemoveEmptyGroup(group, key, groupedIndex);
foreach (var aggregateColumn in _aggregateColumns)
{
aggregateColumn.RemoveOldValue(rowIndex, groupedIndex);
}
return(notifyRequired);
}
private bool RemoveEmptyGroup(List <int> @group, GroupByKey key, int groupedIndex)
{
if (group.Count == 0)
{
// Remove the group
_groupedRows.RemoveAt(groupedIndex);
// _groupedRows.Remove(key);
_keyPositions.Remove(key);
// Remove the field from the aggregate column
foreach (var aggregateColumn in _aggregateColumns)
{
aggregateColumn.RemoveField(groupedIndex);
}
return(true);
}
return(false);
}
private void OnSourceValue(TableUpdate tableUpdate)
{
var columnUpdated = tableUpdate.Column;
var sourceIndex = tableUpdate.RowIndex;
int groupedIndex;
var groupChanged = false;
if (tableUpdate.Action == TableUpdateAction.Add)
{
// New source row added
var key = new GroupByKey(_keyColumns, sourceIndex);
bool notifyOfAdd;
groupedIndex = AddItemToGroup(key, sourceIndex, out notifyOfAdd);
if (notifyOfAdd)
{
NotifyOfGroupAdd(groupedIndex);
}
_sourceRowsToKeys.Add(sourceIndex, key);
groupChanged = true;
}
else if (tableUpdate.Action == TableUpdateAction.Delete)
{
// Source row deleted
var key = _sourceRowsToKeys[sourceIndex];
var group = _groupedRows[key];
groupedIndex = _keyPositions[key];
if (RemoveItemFromGroup(@group, sourceIndex, key, groupedIndex))
{
NotifyOfGroupDelete(groupedIndex);
}
_sourceRowsToKeys.Remove(sourceIndex);
groupChanged = true;
}
else if (tableUpdate.Action == TableUpdateAction.Update &&
_groupColumns.ContainsKey(columnUpdated.ColumnId))
{
// Source row changing group
var key = _sourceRowsToKeys[sourceIndex];
// TODO: figure out how to do this without allocations
var newKey = new GroupByKey(_keyColumns, sourceIndex);
// Move the rowIndex from the old key to the new key
var group = _groupedRows[key];
var oldGroupIndex = _keyPositions[key];
var notifyOfDelete = RemoveItemFromGroup(@group, sourceIndex, key, oldGroupIndex);
bool notifyOfAdd;
groupedIndex = AddItemToGroup(newKey, sourceIndex, out notifyOfAdd);
NotifyOnGroupChange(notifyOfAdd, notifyOfDelete, oldGroupIndex, groupedIndex);
// Replace the rowIndex to key mapping
_sourceRowsToKeys[sourceIndex] = newKey;
var column = FindKeyColumn(columnUpdated.ColumnId, _keyColumns);
column.NotifyObserversOnNext(groupedIndex);
_updates.OnNext(TableUpdate.NewColumnUpdate(groupedIndex, (IReactiveColumn)column));
// Console.WriteLine("Grouped column updated");
groupChanged = true;
}
else
{
var key = _sourceRowsToKeys[sourceIndex];
groupedIndex = _keyPositions[key];
// Console.WriteLine("Non grouped column updated");
}
// Aggregated column has changed or group changed which forces re-calc.
foreach (var aggregateColumn in _aggregateColumns)
{
if (groupChanged ||
tableUpdate.Column.ColumnId == aggregateColumn.SourceColumn.ColumnId)
{
aggregateColumn.ProcessValue(sourceIndex, groupedIndex);
_updates.OnNext(TableUpdate.NewColumnUpdate(groupedIndex, aggregateColumn));
}
}
}