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{       Developer Express Visual Component Library                   }
{       ExpressDataController                                        }
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unit cxBDEAdapters;

{$I cxVer.inc}

interface

uses
  DB, cxDBData, cxFilter, cxDBFilter;

type
  { TcxBDEFilterOperatorAdapter }

  TcxBDEFilterOperatorAdapter = class(TcxDBFilterOperatorAdapter)
  public
    procedure PrepareOperatorClass(ASender: TObject; ADataSet: TDataSet;
      var AOperatorClass: TcxFilterOperatorClass); override;
  end;

implementation

uses
  TypInfo, DBTables, cxVariants;

{ TcxBDEFilterOperatorAdapter }

procedure TcxBDEFilterOperatorAdapter.PrepareOperatorClass(ASender: TObject;
  ADataSet: TDataSet; var AOperatorClass: TcxFilterOperatorClass);
begin
  if AOperatorClass.InheritsFrom(TcxFilterNullOperator) or
    AOperatorClass.InheritsFrom(TcxFilterNotNullOperator) then
  begin
    if ADataSet is TQuery then
    begin
      if AOperatorClass.InheritsFrom(TcxFilterNotNullOperator) then
        AOperatorClass := TcxFilterSQLNotNullOperator
      else
        AOperatorClass := TcxFilterSQLNullOperator;
    end;
  end;  
end;

initialization
  cxFilterOperatorAdapters.RegisterAdapter(TQuery, TcxBDEFilterOperatorAdapter);

finalization
  cxFilterOperatorAdapters.UnregisterAdapter(TQuery, TcxBDEFilterOperatorAdapter);

end.