软件工程师－主观题－远程

阅读下列说明和Objective C代码，将应填入 (n) 处的字句写在答题纸的对应栏内。

备注：可以将以下代码翻译成自己擅长的语言之后，再回答相应的问题。

【说明】某灯具厂商欲生产一个灯具遥控器，该遥控器具有7个可编程的插槽，每个插槽都有开关灯具的开关，现采用Command（命令）模式实现该遥控器的软件部分。Command模式的类图如图1-1所示。

@interface Light : NSObject
- (void)on;
- (void)off;
@end

(1)
- (void)execute;
@end

@interface LightOnCommand : NSObject <Command>
@property (strong, nonatomic) Light *light;
- (id)initWithLight:(Light *)light;
@end

@implementation LightOnCommand
- (id)initWithLight:(Light *)light{
    if (self = [super init]) {
        self.light = light;
    }
    return self;
}
- (void)execute{
    (2)
}
@end

@interface LightOffCommand : NSObject <Command>
@property (strong, nonatomic) Light *light;
- (id)initWithLight:(Light *)light;
@end

@implementation LightOffCommand
- (id)initWithLight:(Light *)light{
    if (self = [super init]) {
        self.light = light;
    }
    return self;
}
- (void)execute{
    (3)
}
@end

@interface RemoteControl : NSObject
@property (strong, nonatomic) NSMutableArray* onCommands;
@property (strong, nonatomic) NSMutableArray* offCommands;
- (void)setCommandWithSlot:(int)slot onCommand:(id<Command>)onCommand andOffCommand:(id<Command>)offCommand;
- (void)onButtonWasPushedAtSlot:(int)slot;
- (void)offButtonWasPushedAtSlot:(int)slot;
@end

@implementation RemoteControl
- (id)init{
    if (self = [super init]) {
        self.onCommands = [NSMutableArray array];
        self.offCommands = [NSMutableArray array];
    }
    return self;
}
- (void)setCommandWithSlot:(int)slot onCommand:(id<Command>)onCommand andOffCommand:(id<Command>)offCommand{
    (4) = onCommand;
    (5) = offCommand;
}
- (void)onButtonWasPushedAtSlot:(int)slot{
    (6)
}
- (void)offButtonWasPushedAtSlot:(int)slot{
    (7)
}
@end

int main(int argc, const char * argv[]) {
    @autoreleasepool {
        RemoteControl *remoteControl = [[RemoteControl alloc] init];
        Light *livingRoomLight = [[Light alloc] init];
        Light *kitchenLight = [[Light alloc] init];
        LightOnCommand *livingRoomLightOn = [[LightOnCommand alloc] initWithLight:livingRoomLight];
        LightOffCommand *livingRoomLightOff = [[LightOffCommand alloc] initWithLight:livingRoomLight];
        LightOnCommand *kitchenRoomLightOn = [[LightOnCommand alloc] initWithLight:kitchenLight];
        LightOffCommand *kitchenRoomLightOff = [[LightOffCommand alloc] initWithLight:kitchenLight];
        [remoteControl setCommandWithSlot:0 onCommand:livingRoomLightOn andOffCommand:livingRoomLightOff];
        [remoteControl setCommandWithSlot:1 onCommand:kitchenRoomLightOn andOffCommand:kitchenRoomLightOff];
        [remoteControl onButtonWasPushedAtSlot:0];
        [remoteControl offButtonWasPushedAtSlot:0];
        [remoteControl onButtonWasPushedAtSlot:1];
        [remoteControl offButtonWasPushedAtSlot:1];
    }
    return 0;
}