有关桥接模式的问题

Question

我正在研究桥模式，我有一个问题。关于我的代码示例，LightSwitch和FanSwitch应该是实现者还是Slider/RadialImplementation可以作为实现者？我的问题是知道谁必须是实现者：这两种组合似乎都以任何顺序工作。我不知道我是否清楚。

class Main
{
    static function main()
    {
        new Main();
    }
    public function new()
    {
        var s:Switch;
        s = new LightSwitch();
        s.implementation = new SliderImplementation();
        s.on();
        s.off();
        s.implementation = new DialImplementation();
        s.on();
        s.off();
        s = new FanSwitch();
        s.implementation = new SliderImplementation();
        s.on();
        s.off();
        s.implementation = new DialImplementation();
        s.on();
        s.off();
    }
}
class Switch
{
    public var implementation:SwitchImplementation;
    public function new(){}
    public function on(){}
    public function off(){}
}
class LightSwitch extends Switch 
{
    public override function on()
    {
        trace("Light");
        implementation.on();
    }
    public override function off()
    {
        implementation.off();
    }
}
class FanSwitch extends Switch 
{
    public override function on()
    {
        trace("Fan");
        implementation.on();
    }
    public override function off()
    {
        implementation.off();
    }
}
class SwitchImplementation
{
    public function new(){}
    public function on(){}
    public function off(){}
}
class SliderImplementation extends SwitchImplementation
{
    public override function on()
    {
        trace("> Slider Switch [on]");
    }
    public override function off()
    {
        trace("> Slider Switch [off]");
    }
}
class DialImp lementation extends SwitchImplementation
{
    public override function on()
    {
        trace("> Dial Switch [on]");
    }
    public override function off()
    {
        trace("> Dial Switch [off]");
    }
}

Answer 1

示例中的实现器是Slider/RadialImplementation类。它们隐藏在通过Light/FanSwitch类的抽象公开的接口后面。