Question

我让我们说一个类，VehicleManager。此类管理Vehicle类型对象的生命周期和调用。车辆充当模块并扩展基础车辆类，这是抽象的。

因此，如果你制作一辆自行车，你永远不会做新的Bike（），你做的是VehicleManager-＆gt;创建（＆＃39; Bike＆＃39;，5）;

我的问题是，我希望每辆车的构造都能接收预定义的参数，并做一些预定义的动作，所以我的基础Vehicle类有一个私有的最终构造函数。

示例：

    Private Sub btnSave_Click()

    Dim strAddNewConsumable As String
    Dim strCompany As String
    Dim strConName As String
    Dim strConID As String
    Dim strCboConSupplier As String
    Dim strConTargetLevel As String
    Dim strConCost As String

        strCompany = Me.ConCompany
        strConName = Me.txtConName
        strConID = Me.txtConID
        strCboConSupplier = Me.CboConSupplier
        strConTargetLevel = Me.txtConTargetLevel
        strConCost = Me.txtConCost

        strAddNewConsumable = "INSERT INTO ConTblConsumables(strConCost, ConName, ConExtraID, Supplier, ConTargetLevel, Cost)" _
                    & "VALUES('" & strCompany & "', '" & strConName & "', '" & strConID & "', '" & strCboConSupplier & "', '" & strConTargetLevel & "', '" & strConCost & "')"

        CurrentDb.Execute (strAddNewConsumable)

        MsgBox "Record Inserted", vbExclamation

End Sub

但我仍然希望每种车型都有一些自定义初始化

所以做完后

final private function __construct(Array $myCustomData){
  $this->customData = $myCustomData;
}

我在做

$newVehicle = new $ClassName($myCustomData);

这可以接受吗？感谢

Answer 1

您可以使用多种模式在项目中生成车辆，查看AbstractFactory或FactoryMethod。可以根据您的程序上下文使用它们。这是AbstractFactory示例：

// Vehicle classes
class Vehicle
{
};

class Car extends Vehicle
{
};

class Bike extends Vehicle
{
};

//Abstract factory classes
abstract class VehicleFactory
{
    abstract protected function GetVehicle( $customData );
};

class CarFactory extends VehicleFactory
{
    public function GetVehicle( $customData )
    {
        //Do special init
        return new Car();
    }
};

class BikeFactory extends VehicleFactory
{
    public function GetVehicle( $customData )
    {
        //Do special init
        return new Bike();
    }
};
//Program context classes
class RaceTrack
{
    public function GenerateRacers( VehicleFactory $factory )
    {
        //$factory->GetVehicle(array());
    }
    public function AddRacers( Vehicle $vehicle )
    {
    }
};
$CarFact = new CarFactory();
$RaceTrack = new RaceTrack();
$RaceTrack->GenerateRacers($CarFact);

这是Factory方法的示例：

//Factory method pattern
class VehicleFactory2
{
    const BIKE_TYPE = 0;
    const CAR_TYPE = 1;

    public function GetVehicle( $type, $customData )
    {
        if ( $type == self::BIKE_TYPE )
        {
            return new Bike($customData);
        }
        else if ( $type == self::CAR_TYPE )
        {
            return new Car($customData);
        }

        return null;
    }
};

$VehicleFact = new VehicleFactory2();
$RaceTrack2 = new RaceTrack();
$RaceTrack2->AddRacers($VehicleFact->GetVehicle(VehicleFactory2::CAR_TYPE, array()));

DI可用作构建者，方法，二者注射剂。使用DI使您的项目更加灵活是一种很好的做法

这个PHP伪DI模式是错误的/危险的吗？

1 个答案: