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baseopf.pp
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baseopf.pp
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unit baseopf;
{$mode objfpc}{$H+}
interface
uses
Classes, SysUtils, tiVisitor, tiObject{, idlist};
Type
TBaseMemento = class(TObject)
protected
FOID: string;
FObjectState: TPerObjectState;
public
constructor CustomCreate(const ASubject: TtiObject); virtual;
Property OID : String Read FOID;
Property ObjectState : TPerObjectState Read FObjectState;
end;
{ TBaseObject }
TBaseObject = Class(TTiObject)
protected
// Override to create correct memento. Do not call inherited.
function GetMemento: TBaseMemento; virtual;
// Override to apply correct memento. Call inherited;
procedure SetMemento(const AValue: TBaseMemento);virtual;
Public
Function ObjectDescription : String; virtual;
Function CheckLength(Const AString,AName : String; Const MaxLen : Integer;Const AErrors: TtiObjectErrors) : Boolean;
Function CheckRequired(Const AString,AName : String; Const AErrors: TtiObjectErrors) : Boolean;
Function CheckRequired(Const ADate : TDateTime; Const AName : String; Const AErrors: TtiObjectErrors) : Boolean;
Function CheckRequired(Const AObj : TObject; Const AName : String; Const AErrors: TtiObjectErrors) : Boolean;
Function CheckRange(Const AValue,AMin,AMax : TDateTime; AName : String; Const AErrors: TtiObjectErrors) : Boolean;
Procedure ValueChange;
Procedure DisplayChange;
procedure ReadPK(const ADBConnectionName: string; APersistenceLayerName: string = ''); override;
procedure ReadThis(const ADBConnectionName: string; APersistenceLayerName: string = ''); override;
procedure Read(const ADBConnectionName: string; APersistenceLayerName: string = ''); override;
procedure Save(const ADBConnectionName: string; APersistenceLayerName: string = ''); override;
procedure ReadPK; override;
procedure ReadThis; override;
procedure Read; override;
procedure Save; override;
// Caller is responsible for freeing the returned memento.
Property Memento : TBaseMemento Read GetMemento Write SetMemento;
end;
TBaseObjectClass = Class of TBaseObject;
{ TBaseObjectList }
TBaseObjectList = Class(TTiObjectList)
Public
Procedure ListChange;
procedure ReadPK(const ADBConnectionName: string; APersistenceLayerName: string = ''); override;
procedure ReadThis(const ADBConnectionName: string; APersistenceLayerName: string = ''); override;
procedure Read(const ADBConnectionName: string; APersistenceLayerName: string = ''); override;
procedure Save(const ADBConnectionName: string; APersistenceLayerName: string = ''); override;
procedure ReadPK; override;
procedure ReadThis; override;
procedure Read; override;
procedure Save; override;
end;
EBaseObject = Class(Exception);
TVisitorType = (vtSave,vtRead,vtReadThis,vtReadPK);
Function VisitorGroupName(C : TClass; VisitorType : TVisitorType) : String;
Function VisitorGroupName(C : TTiObject; VisitorType : TVisitorType) : String;
Procedure RegisterVisitorForClass(AVisitorClass : TTiVisitorClass; ABaseClass : TTiObjectClass; VisitorType : TVisitorType);
Procedure RegisterVisitorsForClass(ABaseClass : TTiObjectClass; ACreate,AUpdate,ADelete,ARead,AReadThis,AReadPK : TTiVisitorClass);
Procedure RegisterVisitorsForClass(ABaseClass : TTiObjectClass; ACreate,AUpdate,ADelete,ARead,AReadThis : TTiVisitorClass);
Procedure RegisterVisitorsForClass(ABaseClass : TTiObjectClass; ACreate,AUpdate,ADelete,ARead : TTiVisitorClass);
Function IndexOfString(S : String; List : Array of string) : Integer;
const
SaveAllGroup = 'SaveAll';
implementation
uses
typinfo,
tiOPFManager;
Resourcestring
SErrorMaxLength = 'Maximum fieldlength for "%s" is %d';
SErrorFieldValueRequired = 'A value for "%s" is required';
SErrorFieldValueBetween = 'The value for field "%s" must be between %s and %s';
var
RegisteredSaveVisitors : TList;
Function IndexOfString(S : String; List : Array of string) : Integer;
begin
S:=UpperCase(S);
Result:=High(List);
While (Result>=0) and (S<>UpperCase(List[Result])) do
Dec(Result);
end;
Function VisitorGroupName(C : TClass; VisitorType : TVisitorType) : String;
Const
Suffix : Array [TVisitorType] of String
= ('Save','Read','ReadThis','ReadPK');
begin
Assert(C<>Nil,'No class type specified');
Result:=C.ClassName;
Result:=Result+Suffix[VisitorType];
end;
Function VisitorGroupName(C : TTiObject; VisitorType : TVisitorType) : String;
begin
Assert(C<>Nil,'No class instance specified');
Result:=VisitorGroupName(C.ClassType,VisitorType);
end;
Procedure RegisterVisitorForClass(AVisitorClass : TTiVisitorClass; ABaseClass : TTiObjectClass; VisitorType : TVisitorType);
begin
with gTiOPFManager.VisitorManager do
begin
RegisterVisitor(VisitorGroupName(ABaseClass,VisitorType),AVisitorClass);
if VisitorType = vtSave then
begin
// alleen erin steken als visitor nog niet in lijst zit.
if RegisteredSaveVisitors.indexof (AVisitorClass) < 0 then
begin
RegisterVisitor(SaveAllGroup, AVisitorClass);
RegisteredSaveVisitors.Add (AVisitorClass);
end;
end
end;
end;
Procedure RegisterVisitorsForClass(ABaseClass : TTiObjectClass; ACreate,AUpdate,ADelete,ARead,AReadThis,AReadPK : TTiVisitorClass);
Procedure MaybeRegVisitor(Vis : TTiVisitorClass; AType : TVisitorType);
begin
If (Vis<>Nil) then
RegisterVisitorForClass(Vis,ABaseClass,AType);
end;
begin
MaybeRegVisitor(AReadPK,vtReadPK);
MaybeRegVisitor(AReadThis,vtReadThis);
MaybeRegVisitor(ARead,vtRead);
MaybeRegVisitor(AUpdate,vtSave);
If ADelete<>AUpdate then
MaybeRegVisitor(ADelete,vtSave);
If ADelete<>AUpdate then
MaybeRegVisitor(ACreate,vtSave);
end;
Procedure RegisterVisitorsForClass(ABaseClass : TTiObjectClass; ACreate,AUpdate,ADelete,ARead,AReadThis : TTiVisitorClass);
begin
RegisterVisitorsForClass(ABaseClass,ACreate,AUpdate,ADelete,ARead,AReadThis,Nil);
end;
Procedure RegisterVisitorsForClass(ABaseClass : TTiObjectClass; ACreate,AUpdate,ADelete,ARead : TTiVisitorClass);
begin
RegisterVisitorsForClass(ABaseClass,ACreate,AUpdate,ADelete,ARead,Nil,Nil);
end;
{ TBaseObject }
function TBaseObject.GetMemento: TBaseMemento;
begin
Result:=TBaseMemento.CustomCreate(Self);
end;
procedure TBaseObject.SetMemento(const AValue: TBaseMemento);
begin
OID.AsString:=AValue.OID;
ObjectState:=AValue.FObjectState;
end;
function TBaseObject.ObjectDescription: String;
begin
Result:=ClassName;
end;
function TBaseObject.CheckLength(const AString, AName: String;
const MaxLen: Integer; const AErrors: TtiObjectErrors): Boolean;
begin
Result:=Length(AString)<=MaxLen;
If Not Result then
AErrors.AddError(AName,Format(SErrorMaxLength,[AName,MaxLen]));
end;
function TBaseObject.CheckRequired(const AString, AName: String;
const AErrors: TtiObjectErrors): Boolean;
begin
Result:=Length(AString)>0;
If Not Result then
AErrors.AddError(AName,Format(SErrorFieldValueRequired,[AName]));
end;
function TBaseObject.CheckRequired(const ADate: TDateTime; Const AName : String;
const AErrors: TtiObjectErrors): Boolean;
begin
Result:=(ADate<>0);
If Not Result then
AErrors.AddError(AName,Format(SErrorFieldValueRequired,[AName]));
end;
function TBaseObject.CheckRequired(const AObj: TObject; const AName: String;
const AErrors: TtiObjectErrors): Boolean;
begin
Result:=(AObj<>Nil);
If Not Result then
AErrors.AddError(AName,Format(SErrorFieldValueRequired,[AName]));
end;
function TBaseObject.CheckRange(const AValue, AMin, AMax: TDateTime;
AName: String; const AErrors: TtiObjectErrors): Boolean;
begin
Result:=(AValue>=AMin) and (AValue<=AMax);
If Not Result then
AErrors.AddError(AName,Format(SErrorFieldValueBetween,[AName, DateToStr(AMin), DateToStr(AMax)]));
end;
procedure TBaseObject.ValueChange;
Var
S : String;
begin
// Do something
Case ObjectState of
posEmpty :
Dirty:=True;
else
S:=ObjectStateAsString;
if Not (ObjectState in [posDelete,PosCreate]) then
ObjectState:=posUpdate;
end;
DisplayChange;
end;
procedure TBaseObject.DisplayChange;
begin
NotifyObservers;
end;
procedure TBaseObject.ReadPK(const ADBConnectionName: string;
APersistenceLayerName: string);
begin
gTiOPFManager.VisitorManager.Execute(VisitorGroupName(Self,vtReadPK),Self,ADBConnectionName,APersistenceLayerName);
end;
procedure TBaseObject.ReadThis(const ADBConnectionName: string;
APersistenceLayerName: string);
begin
gTiOPFManager.VisitorManager.Execute(VisitorGroupName(Self,vtReadThis),Self,ADBConnectionName,APersistenceLayerName);
end;
procedure TBaseObject.Read(const ADBConnectionName: string;
APersistenceLayerName: string);
begin
BeginUpdate;
gTiOPFManager.VisitorManager.Execute(VisitorGroupName(Self,vtRead),Self,ADBConnectionName,APersistenceLayerName);
EndUpdate;
end;
procedure TBaseObject.Save(const ADBConnectionName: string;
APersistenceLayerName: string);
begin
gTiOPFManager.VisitorManager.Execute(VisitorGroupName(Self,vtSave),Self,ADBConnectionName,APersistenceLayerName);
end;
procedure TBaseObject.ReadPK;
begin
inherited ReadPK;
end;
procedure TBaseObject.ReadThis;
begin
inherited ReadThis;
end;
procedure TBaseObject.Read;
begin
inherited Read;
end;
procedure TBaseObject.Save;
begin
inherited Save;
end;
{ TBaseObjectList }
procedure TBaseObjectList.ListChange;
begin
NotifyObservers;
end;
procedure TBaseObjectList.ReadPK(const ADBConnectionName: string;
APersistenceLayerName: string);
begin
beginupdate;
try
gTiOPFManager.VisitorManager.Execute(VisitorGroupName(Self,vtReadPK),Self,ADBConnectionName,APersistenceLayerName);
finally
endupdate;
end;
end;
procedure TBaseObjectList.ReadThis(const ADBConnectionName: string;
APersistenceLayerName: string);
begin
beginupdate;
try
gTiOPFManager.VisitorManager.Execute(VisitorGroupName(Self,vtReadThis),Self,ADBConnectionName,APersistenceLayerName);
finally
endupdate;
end;
end;
procedure TBaseObjectList.Read(const ADBConnectionName: string;
APersistenceLayerName: string);
begin
beginupdate;
try
gTiOPFManager.VisitorManager.Execute(VisitorGroupName(Self,vtRead),Self,ADBConnectionName,APersistenceLayerName);
finally
endupdate;
end;
end;
procedure TBaseObjectList.Save(const ADBConnectionName: string;
APersistenceLayerName: string);
begin
gTiOPFManager.VisitorManager.Execute(VisitorGroupName(Self,vtSave),Self,ADBConnectionName,APersistenceLayerName);
end;
procedure TBaseObjectList.ReadPK;
begin
inherited ReadPK;
end;
procedure TBaseObjectList.ReadThis;
begin
inherited ReadThis;
end;
procedure TBaseObjectList.Read;
begin
inherited Read;
end;
procedure TBaseObjectList.Save;
begin
inherited Save;
end;
{ TBaseMemento }
constructor TBaseMemento.CustomCreate(const ASubject: TtiObject);
begin
Create;
FOID := ASubject.OID.AsString;
FObjectState := ASubject.ObjectState;
end;
initialization
RegisteredSaveVisitors := TList.Create;
finalization
RegisteredSaveVisitors.Free;
end.