protected override void OnCompile()
{
if (SyntaxNode.GroupByClause != null)
{
Select = SyntaxNode.GroupByClause.CreateGroupBySelector <TSource, TResult>(SyntaxNode.Columns.Aggregates);
}
else
{
Select = SyntaxNode.Columns.CreateSelector <TSource, TResult>();
}
// build up the source and result filters
if (SyntaxNode.WhereClause != null)
{
SourceFilters.Add(list => list.Where(SyntaxNode.WhereClause.CreateEvaluator <TSource>()));
}
if (SyntaxNode.OrderByClause != null)
{
SourceFilters.Add(SyntaxNode.OrderByClause.CreateEvaluator <TSource>());
}
if (SyntaxNode.HavingClause != null)
{
ResultFilters.Add(list => list.Where(SyntaxNode.HavingClause.CreateEvaluator <TResult>()));
}
if (SyntaxNode.Columns.Distinct)
{
ResultFilters.Add(list => list.Distinct(CreateDistinctComparer()));
}
}
public void CloseDrivers()
{
for (int DeviceCount = 0; DeviceCount < SourceFilters.Count; DeviceCount++)
{
FireDTVSourceFilterInfo SourceFilter = SourceFilters.Item(DeviceCount);
_sourceFilterCollection.RemoveAt(DeviceCount);
}
}
public IEnumerable <TResult> Evaluate(IEnumerable <TSource> source)
{
Debug.Assert(source != null);
Debug.Assert(Select != null);
var result = Select(SourceFilters.Evaluate(source));
return(ResultFilters.Evaluate(result));
}
