I have a question on the example below.
Why don't you use RTTI to define the properties ?
If you make the properties published, you don't need the
AfterConstruction method. It won't work for all types, but most will
do just fine.
RTTI could be used to get properties values, but as you mention is
limited, using in this way I can expand as necessary.
Look that the fields are custom types (IStringType, IDateType,
IBlobType, etc), in AfterConstruction I call AddMember to create a
instance of Fields.
TObjectType mantain a list of members (TStringHash), used for
integration with other framewords (OPF and MVP).
var
I: Integer;
LPerson: IPerson
begin
LPerson:= TPerson.Create;
LPerson.Member['Name'].Value:= 'Cesar'
or
for I:= to LPerson.Count -1 do
begin
if LPerson[I].State.Modified then
....
end;
I have used RTTI in DePO, but was too much limited.
[]s
Cesar Romero
Michael.
unit BOPerson;
interface
uses
(* delphi *)
Classes,
(* jazz *)
JazzValueTypeIntf, JazzValueType, JazzTypeInfo,
(* application *)
BOPersonIntf;
type
TPerson = class(TObjectType, IPerson)
private
FID: IStringType;
FName: IStringType;
FBirthDate: IDateType;
FDocument: IStringType;
FPicture: IBlobType;
protected
function GetBirthDate: TDateTime;
function GetDocument: string;
function GetID: string;
function GetName: string;
function GetPicture: TStream;
procedure SetBirthDate(const Value: TDateTime);
procedure SetDocument(const Value: string);
procedure SetID(const Value: string);
procedure SetName(const Value: string);
procedure SetPicture(const Value: TStream);
property ID: string read GetID write SetID;
property Name: string read GetName write SetName;
property BirthDate: TDateTime read GetBirthDate write SetBirthDate;
property Document: string read GetDocument write SetDocument;
property Picture: TStream read GetPicture write SetPicture;
public
procedure AfterConstruction; override;
end;
implementation
{ TPerson }
procedure TPerson.AfterConstruction;
begin
inherited;
AddMember(FID, 'ID', TStringType);
AddMember(FName, 'Name', TStringType);
AddMember(FBirthDate, 'BirthDate', TDateType);
AddMember(FDocument, 'Document', TStringType);
AddMember(FPicture, 'Picture', TBlobType);
end;
function TPerson.GetDocument: string;
begin
Result:= FDocument.Value;
end;
function TPerson.GetID: string;
begin
Result:= FID.Value;
end;
function TPerson.GetName: string;
begin
Result:= FName.Value;
end;
function TPerson.GetPicture: TStream;
begin
Result:= FPicture.Value;
end;
procedure TPerson.SetDocument(const Value: string);
begin
FDocument.Value:= Value;
end;
procedure TPerson.SetID(const Value: string);
begin
FID.Value:= Value;
end;
procedure TPerson.SetName(const Value: string);
begin
FName.Value:= Value
end;
procedure TPerson.SetPicture(const Value: TStream);
begin
FPicture.Value:= Value;
end;
function TPerson.GetBirthDate: TDateTime;
begin
Result:= FBirthDate.Value;
end;
procedure TPerson.SetBirthDate(const Value: TDateTime);
begin
FBirthDate.Value:= Value;
end;
end.
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