Go言語基本テンプレートデザインパターン例解説

package main
import "fmt"
/* Travel mode interface*/
type Itravel interface {
	Starting() // starting point
	Travel() //travel mode
	End() // end point
}
//define the parent class
type Persion struct {
	Name string // Name
	Itravel Itravel // Travel mode interface
}
func (persion *Persion) SetName(name string) {
	persion.Name = name
}
func (persion Persion) Starting() {
	persion.Itravel.Starting()
Starting() }
func (persion Persion) Travel() {
	Travel()
}
func (persion Persion) End() {
	persion.Itravel.End()
}
// Algorithm skeleton
func (persion Persion) Start() {
	if persion.Itravel == nil {
		fmt.Println("Itravel is nil")
		return
	}
	fmt.Printf("%s", persion.Name)	
	persion.Starting()
	persion.Travel()
	persion.End()
	fmt.Println("\n")
}
// Concrete class: ZhangSan
type ZhangSan struct {
	Persion // anonymous fields to achieve inheritance
}
func NewZhangSan() *ZhangSan {
	c := new(ZhangSan)
	c.Persion = Persion{Itravel: c}
	return c
}
func (_ ZhangSan) Starting() {
	fmt.Printf("Starting from %s", "Beijing")
}

func (_ ZhangSan) Travel() {
	fmt.Printf(" %s", "train")
}
func (_ ZhangSan) End() {
	fmt.Printf(" %s", "Arrived in Shanghai")
}
// Concrete class: LiSi
type LiSi struct {
	Persion
}
func (_ LiSi) Starting() {
	fmt.Printf("Starting from %s", "Guangzhou")
}
func (_ LiSi) Travel() {
	fmt.Printf(" %s", "By plane")
}
func (_ LiSi) End() {
	fmt.Printf(" %s", "Arrived in Chongqing")
}
func main() {
	// Zhang San
	zhangsan := NewZhangSan()
	zhangsan.SetName("ZhangSan")
	zhangsan.Start()
	persion := &Version{}
	persion.SetName("Zhang San")
	persion.Itravel = ZhangSan{}
	persion.Start()
	// Li Si
	persion.SetName("李四")
	persion.Itravel = &LiSi{}
	persion.Start()
	lisi := LiSi{}
	lisi.Itravel = lisi
	lisi.SetName("LiSi")
	lisi.Start()
}