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GS.BOList.pas
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GS.BOList.pas
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///-------------------------------------------------------------------------------
/// Title : GS.BOList
/// Short Desc : Business Object list handler.
/// Source : https://github.com/VincentGsell
/// Aim : Get a reasonably fast list to access object by key (Generic)
/// "Object" Counterpart of BOListRec (For Record)
///-------------------------------------------------------------------------------
unit GS.BOList;
{$IFDEF FPC} {$mode delphi} {$H+} {$ENDIF}
interface
uses Classes, SysUtils,
{$IFDEF DELPHI}
System.Generics.collections;
{$ELSE}
Generics.collections;
{$ENDIF}
Type
TofBusinessObjectList<T> = Class
Private
FBusinessObject : TDictionary<T,TObject>; //Owned = False; (Not TObjectDictionnary.)
FBusinessObjectB : TDictionary<TObject,T>; //Optimization : Because run throught Dictionnary is slow.
FBusinessObjectListShadow : TList<TObject>; //Optimization : Access by Index.
function GetBusinessObject(Key : T): TObject;
procedure SetBusinessObject(Key : T; const Value: TObject);
function GetBusinessObjectByIndex(Index: uInt64): TObject;
function GetBusinessObjectByObject(aObject: TObject): T;
Public
Constructor Create;
Destructor Destroy; Override;
Function ContainsKey(aKey : T) : Boolean;
Function ContainsValue(aObject : TObject) : Boolean;
Function Count : uInt64;
Procedure Add(aKey : T; aValue : TObject);
Procedure ChangeKey(NewOne: T; aObject: TObject);
Procedure RemoveKey(aKey : T); Overload;
Procedure Remove(aValue : TObject); Overload;
Procedure Clear;
Property ByIndex[Index : uInt64] : TObject read GetBusinessObjectByIndex;
Property ByObject[aObject : TObject] : T read GetBusinessObjectByObject;
Property ByValue[aValue : T] : TObject read GetBusinessObject Write SetBusinessObject; Default;
End;
implementation
{ TofBusinessObjectList<T> }
procedure TofBusinessObjectList<T>.Add(aKey: T; aValue: TObject);
begin
if Not(FBusinessObject.ContainsKey(aKey)) then
begin
FBusinessObject.Add(aKey,aValue);
FBusinessObjectB.Add(aValue,aKey);
FBusinessObjectListShadow.Add(aValue);
end
else
begin
raise Exception.Create('TofBusinessObjectList<T>.Add : Key already exists.');
end;
end;
procedure TofBusinessObjectList<T>.ChangeKey(NewOne: T; aObject: TObject);
var g : T;
begin
if FBusinessObject.ContainsKey(NewOne) then
begin
raise Exception.Create('TofBusinessObjectList<T>.ChangeKey : Cannot change NewKey because it is already used.');
end;
if FBusinessObject.ContainsValue(aObject) then
begin
g := FBusinessObjectB[aObject];
FBusinessObject.Remove(g);
FBusinessObjectB.Remove(aObject);
FBusinessObjectListShadow.Remove(aObject);
FBusinessObject.Add(NewOne,aObject);
FBusinessObjectB.Add(aObject,NewOne);
FBusinessObjectListShadow.Add(aObject);
end;
end;
procedure TofBusinessObjectList<T>.Clear;
begin
FBusinessObject.Clear;
FBusinessObjectB.Clear;
FBusinessObjectListShadow.Clear;
end;
function TofBusinessObjectList<T>.ContainsKey(aKey: T): Boolean;
begin
Result := FBusinessObject.ContainsKey(aKey);
end;
function TofBusinessObjectList<T>.ContainsValue(aObject: TObject): Boolean;
begin
Result := FBusinessObject.ContainsValue(aObject);
end;
function TofBusinessObjectList<T>.Count: uInt64;
begin
Result := FBusinessObject.Count;
end;
constructor TofBusinessObjectList<T>.Create;
begin
Inherited;
FBusinessObject := TDictionary<T,TObject>.Create;
FBusinessObjectB := TDictionary<TObject,T>.Create;
FBusinessObjectListShadow := TList<TObject>.Create;
end;
destructor TofBusinessObjectList<T>.Destroy;
begin
FBusinessObject.Clear;
FBusinessObjectB.Clear;
FBusinessObjectListShadow.Clear;
FreeAndNil(FBusinessObject);
FreeAndNil(FBusinessObjectB);
FreeAndNil(FBusinessObjectListShadow);
inherited;
end;
function TofBusinessObjectList<T>.GetBusinessObject(Key: T): TObject;
begin
try
Result := FBusinessObject[Key];
Except
On E : Exception do
begin
raise Exception.Create('TofBusinessObjectList<T>.GetBusinessObject : '+E.Message);
end;
end;
end;
function TofBusinessObjectList<T>.GetBusinessObjectByIndex(
Index: uInt64): TObject;
begin
try
Result := TObject(FBusinessObjectListShadow[Index]);
Except
On E : Exception do
begin
raise Exception.Create('TofBusinessObjectList<T>.GetBusinessObjectByIndex (ByIndex[uint64]) : '+E.Message);
end;
end;
end;
function TofBusinessObjectList<T>.GetBusinessObjectByObject(
aObject: TObject): T;
begin
Result := FBusinessObjectB[aObject];
end;
procedure TofBusinessObjectList<T>.RemoveKey(aKey: T);
var a :TObject;
begin
a := FBusinessObject[aKey];
if Assigned(a) then
begin
FBusinessObject.Remove(aKey);
FBusinessObjectB.Remove(a);
FBusinessObjectListShadow.Remove(a);
end;
end;
procedure TofBusinessObjectList<T>.Remove(aValue: TObject);
var a : T;
str : String;
begin
a := FBusinessObjectB[aValue];
if FBusinessObject.ContainsKey(a) then
begin
RemoveKey(a);
end;
end;
procedure TofBusinessObjectList<T>.SetBusinessObject(Key: T; const Value: TObject);
var str : string;
begin
if FBusinessObject.ContainsKey(Key) then
begin
if FBusinessObject[Key] <> Value then
raise Exception.Create('TofBusinessObjectList<T>.SetBusinessObject : Key already present in List, but object is different : Remove First.');
end
else
begin
FBusinessObject.Add(Key,Value);
FBusinessObjectB.Add(Value,Key);
FBusinessObjectListShadow.Add(Value);
end;
end;
end.