money
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424 | unit money;
{$mode objfpc}{$H+}
interface
uses
Classes, SysUtils;
type
TMoney = class;
TMoneyBag = class;
IMoney = interface ['{2E0160F6-312C-D911-8DE5-DD8AC3E7C6F4}']
function add(m: IMoney): IMoney;
function addMoney(m: TMoney): IMoney;
function addMoneyBag(mb: TMoneyBag): IMoney;
function isZero: boolean; function multiply(factor: integer): IMoney;
function negate: IMoney;
function subtract(m: IMoney): IMoney;
procedure appendTo(m: TMoneyBag);
function toString: String; function equals(m: IMoney): boolean;
function Count: integer;
function _Self: TObject;
end;
ISingleCurrencyMoney = interface(IMoney)
['{D6D97717-E52D-D911-83C4-8233402A6B6C}']
function GetCurrencyUnit: string;
function GetAmount: int64;
property Amount: int64 read GetAmount; property CurrencyUnit: string read GetCurrencyUnit;
end;
TMoney = class(TInterfacedObject, IMoney, ISingleCurrencyMoney)
private FAmount: int64;
FCurrencyUnit: String;
function GetAmount: int64;
function GetCurrencyUnit: string;
public constructor Create(aAmount: int64; aCurrencyUnit: String);
function add(m: IMoney): IMoney;
function addMoney(m: TMoney): IMoney;
function addMoneyBag(mb: TMoneyBag): IMoney;
function isZero: Boolean; function multiply(factor: Integer): IMoney;
function negate: IMoney;
function subtract(m: IMoney): IMoney;
procedure appendTo(m: TMoneyBag);
function toString: String; function equals(m: IMoney): boolean;
property Amount: int64 read GetAmount;
property CurrencyUnit: string read GetCurrencyUnit;
function Count: integer;
function _Self: TObject; end;
TMoneyBag = class(TInterfacedObject, IMoney)
private
FMonies: TFPList; function AddToMoniesList(const Item: IInterface): Integer;
function RemoveFromMoniesList(const Item: IInterface): Integer;
function FindMoney(aCurrencyUnit: string): ISingleCurrencyMoney;
function Contains(m: ISingleCurrencyMoney): boolean;
public constructor Create;
class function CreateWith(m1: IMoney; m2: IMoney): IMoney;
destructor Destroy; override;
function Simplify: IMoney;
function add(m: IMoney): IMoney; function addMoney(m: TMoney): IMoney;
function addMoneyBag(mb: TMoneyBag): IMoney;
procedure appendBag(aBag: TMoneyBag);
procedure appendMoney(aMoney: ISingleCurrencyMoney);
function isZero: boolean; function multiply(factor: integer): IMoney;
function negate: IMoney;
function subtract(m: IMoney): IMoney;
procedure appendTo(m: TMoneyBag);
function toString: String; function equals(m: IMoney): boolean;
function Count: integer;
function _Self: TObject;
end;
Operator + (c: IMoney; c1: IMoney) c2: IMoney;
Operator - (c: IMoney; c1: IMoney) c2: IMoney;
Operator * (c: IMoney; i: integer) c2: IMoney;
implementation
Operator + (c: IMoney; c1: IMoney) c2: IMoney;
begin
c2 := c.add(c1);
end;
Operator - (c: IMoney; c1: IMoney) c2: IMoney;
begin
c2 := c.subtract(c1);
end;
Operator * (c: IMoney; i: integer) c2: IMoney;
begin
c2 := c.multiply(i);
end;
function TMoneyBag.AddToMoniesList(const Item: IInterface): Integer;
begin
Result := FMonies.Add(nil);
IInterface(FMonies.List^[Result]) := Item;end;
function TMoneyBag.RemoveFromMoniesList(const Item: IInterface): Integer;
begin
Result := FMonies.IndexOf(Pointer(Item)); if Result > -1 then
begin
IInterface(FMonies.List^[Result]) := nil;
FMonies.Delete(Result);
end;end;
function TMoneyBag.FindMoney(aCurrencyUnit: string): ISingleCurrencyMoney;
var
i: Integer;begin
for i := 0 to FMonies.Count - 1 do
if ISingleCurrencyMoney(FMonies.items[i]).CurrencyUnit = aCurrencyUnit then
begin
Result := ISingleCurrencyMoney(FMonies.items[i]); Exit;
end;
end;
function TMoneyBag.Contains(m: ISingleCurrencyMoney): boolean;var
found: ISingleCurrencyMoney;
begin
found := FindMoney(m.CurrencyUnit);
if found = nil then begin
Result := false;
Exit;
end;
Result := (found.Amount = m.amount);end;
class function TMoneyBag.CreateWith(m1: IMoney; m2: IMoney): IMoney;
var
mb: IMoney;begin
mb := TMoneyBag.Create;
m1.AppendTo(TMoneyBag(mb._Self));
m2.AppendTo(TMoneyBag(mb._Self));
Result := TMoneyBag(mb._Self).Simplify;end;
constructor TMoneyBag.Create;
begin
FMonies := TFPList.Create;end;
destructor TMoneyBag.Destroy;
var
i: integer;begin
for i := 0 to FMonies.Count - 1 do
IInterface(FMonies.items[i])._release;
FMonies.Free;
inherited Destroy;end;
function TMoneyBag.Simplify: IMoney;
begin
if FMonies.Count = 1 then Result := IMoney(FMonies.items[0])
else
Result := Self;
end;
function TMoneyBag.add(m: IMoney): IMoney;
begin
Result := m.AddMoneyBag(Self);
end;
function TMoneyBag.addMoney(m: TMoney): IMoney;
begin
Result := TMoneyBag.CreateWith(m, Self);
end;
function TMoneyBag.addMoneyBag(mb: TMoneyBag): IMoney;
begin
Result := TMoneyBag.CreateWith(mb, Self);
end;
procedure TMoneyBag.appendBag(aBag: TMoneyBag);
var
i: integer;
begin
for i := 0 to aBag.FMonies.Count - 1 do appendMoney(ISingleCurrencyMoney(aBag.FMonies.Items[i]));
end;
procedure TMoneyBag.appendMoney(aMoney: ISingleCurrencyMoney);
var old: IMoney;
sum: IMoney;
begin
if aMoney.isZero then Exit;
old := findMoney(aMoney.CurrencyUnit); if old = nil then
begin
AddToMoniesList(aMoney);
Exit;
end; sum := old.Add(aMoney);
RemoveFromMoniesList(old);
if sum.isZero then Exit;
AddToMoniesList(sum);
end;
function TMoneyBag.isZero: boolean;
begin
Result := FMonies.Count = 0;
end;
function TMoneyBag.multiply(factor: integer): IMoney;
var
i: Integer;
begin Result := TMoneyBag.Create;
if factor <> 0 then
for i := 0 to FMonies.Count - 1 do
begin
TMoneyBag(Result._Self).appendMoney(ISingleCurrencyMoney( ISingleCurrencyMoney(FMonies.items[i]).Multiply(factor)));
end;
end;
function TMoneyBag.negate: IMoney;var
i: integer;
begin
Result := TMoneyBag.Create;
for i := 0 to FMonies.Count - 1 do begin
TMoneyBag(Result._Self).appendMoney(ISingleCurrencyMoney(
ISingleCurrencyMoney(FMonies.items[i]).negate));
end;
end;
function TMoneyBag.subtract(m: IMoney): IMoney;
begin
Result := Add(m.negate);
end;
procedure TMoneyBag.appendTo(m: TMoneyBag);
begin
m.AppendBag(Self);
end;
function TMoneyBag.toString: String;
var
i: integer;
begin Result := '{';
for i := 0 to FMonies.Count - 1 do
Result := Result + ISingleCurrencyMoney(FMonies.items[i]).ToString;
Result := Result + '}';
end;
function TMoneyBag.equals(m: IMoney): boolean;
var
aMoneyBag: TMoneyBag;
i: integer; ism: ISingleCurrencyMoney;
begin
if m = nil then
begin
Result := false; Exit;
end;
if isZero then
begin
Result := m.isZero; Exit;
end;
if m._Self.ClassType = TMoneyBag then
begin
aMoneyBag := TMoneyBag(m._Self); if aMoneyBag.FMonies.count <> FMonies.Count then
begin
Result := false;
Exit;
end; for i := 0 to FMonies.Count - 1 do
begin
ism := ISingleCurrencyMoney(FMonies.items[i]);
if not aMoneyBag.Contains(ism) then
begin Result := false;
Exit;
end;
end;
Result := true; Exit;
end;
Result := false;
end;
function TMoneyBag.Count: integer;
begin
Result := FMonies.Count;
end;
function TMoneyBag._Self: TObject;
begin
Result := Self;
end;
{ TMoney }
function TMoney.GetCurrencyUnit: string;
begin Result := FCurrencyUnit;
end;
function TMoney.GetAmount: int64;
begin Result := FAmount;
end;
constructor TMoney.Create(aAmount: int64; aCurrencyUnit: string);
begin FAmount := aAmount;
FCurrencyUnit := aCurrencyUnit;
end;
function TMoney.add(m: IMoney): IMoney;begin
Result := m.AddMoney(Self);
end;
function TMoney.addMoney(m: TMoney): IMoney;begin
if (m.CurrencyUnit = Self.CurrencyUnit) then
Result := TMoney.Create(Self.Amount + m.Amount, Self.CurrencyUnit)
else
Result := TMoneyBag.CreateWith(Self, M);end;
function TMoney.addMoneyBag(mb: TMoneyBag): IMoney;
begin
Result := mb.AddMoney(Self);end;
function TMoney.isZero: Boolean;
begin
Result := Amount = 0;end;
function TMoney.multiply(factor: Integer): IMoney;
begin
Result := TMoney.Create(Amount * factor, CurrencyUnit);end;
function TMoney.negate: IMoney;
begin
Result := TMoney.Create(- Amount, CurrencyUnit);end;
function TMoney.subtract(m: IMoney): IMoney;
begin
Result := Add(m.negate);end;
procedure TMoney.appendTo(m: TMoneyBag);
begin
m.AppendMoney(Self);end;
function TMoney.toString: String;
begin
Result := '[' + IntToStr(FAmount) + ' '+ FCurrencyUnit + ']';end;
function TMoney.equals(m: IMoney): boolean;
var
ism: ISingleCurrencyMoney;begin
if Assigned(m) then
begin
if isZero then
Result := m.isZero; if m._Self.ClassType = TMoney then
begin
ism := ISingleCurrencyMoney(m);
Result := (ism.Amount = Amount) and
(ism.CurrencyUnit = CurrencyUnit) end
else
Result := false;
end
else Result := false;
end;
function TMoney.Count: integer;
begin Result := 1;
end;
function TMoney._Self: TObject;
begin Result := Self;
end;
end. |
Punto importante: Si vas a sugerir un segmento de código en algún lenguaje debes hacerlo así:
- Si es lenguaje C <code lang="c">Código en C</code>
- Si es lenguaje Pascal <code lang="pascal">Aquí dentro el código de Pascal</code>.
De esta manera el código coloreas el código.
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