使用go实现适配器模式

目录

• 适配器模式

• 定义
• 代码实现
• 优点
• 缺点
• 适用范围
• 参考

// 基础的播放功能
type MediaPlayer interface {
	play(audioType string, fileName string)
}
// 不同的播放器平台
type AdvancedMediaPlayer interface {
	playVlc(fileName string)
	playMp4(fileName string)
}
// VlcPlayers
type VlcPlayers struct {
}
func (v *VlcPlayers) playVlc(fileName string) {
	fmt.Println("正在播放" + fileName)
}
func (v *VlcPlayers) playMp4(fileName string) {
	fmt.Println("格式不支持")
}
// Mp4Player
type Mp4Player struct {
}
func (m *Mp4Player) playVlc(fileName string) {
	fmt.Println("格式不支持")
}
func (m *Mp4Player) playMp4(fileName string) {
	fmt.Println("正在播放" + fileName)
}
// 适配器
type MediaAdapter struct {
	MusicPlayer AdvancedMediaPlayer
}
func NewMediaAdapter(audioType string) *MediaAdapter {
	var mediaAdapter MediaAdapter
	switch audioType {
	case "vlc":
		mediaAdapter.MusicPlayer = &VlcPlayers{}
	case "mp4":
		mediaAdapter.MusicPlayer = &Mp4Player{}
	default:
		panic("不支持的类型")
	}
	return &mediaAdapter
}
func (m *MediaAdapter) play(audioType string, fileName string) {
	switch audioType {
	case "vlc":
		m.MusicPlayer.playVlc(fileName)
	case "mp4":
		m.MusicPlayer.playMp4(fileName)
	}
}
// AudioPlayer 音频播放器类
type AudioPlayer struct {
	mediaAdapter *MediaAdapter
}
// Play 播放音频
func (auPlayer *AudioPlayer) Play(audioType, fileName string) {
	if audioType == "mp3" {
		fmt.Println("正在播放" + fileName)
		return
	}
	auPlayer.mediaAdapter = NewMediaAdapter(audioType)
	auPlayer.mediaAdapter.play(audioType, fileName)
}

func TestPlayer(t *testing.T) {
	ad := AudioPlayer{}
	ad.Play("mp4", "荷塘月色")
	ad.Play("vlc", "小苹果")
	ad.Play("mp3", "天空之城")
}