package main
import (
"fmt"
)
// 环境类
type Account struct{
State ActionState
HealthValue int
}
// 状态类
type ActionState interface{
View()
Comment()
Post()
}
// new accout
func NewAccount(health int) *Account{
a:=&Account{
HealthValue: health,
}
a.changeState()
return a
}
// set healthValue for account
func (a *Account) SetHealth(value int){
a.HealthValue = value
a.changeState()
}
func (a *Account) changeState(){
if a.HealthValue <= -10{
a.State=&CloseState{}
}else if a.HealthValue >-10 && a.HealthValue <= 0{
a.State = &Retricted{}
} else if a.HealthValue > 0{
a.State = & NormalState{}
}
}
// state 三种状态
type NormalState struct{}
type Retricted struct{}
type CloseState struct{}
// 封装state 三种状态的不同行为
func (c *CloseState) View(){
fmt.Println("无法查看")
}
func (c *CloseState) Comment(){
fmt.Println("不能评论")
}
func (c *CloseState) Post(){
fmt.Println("不能发布")
}
func (r *Retricted) View(){
fmt.Println("正常")
}
func (r *Retricted) Comment(){
fmt.Println("正常")
}
func (r *Retricted) Post(){
fmt.Println("不能发布")
}
func (r *NormalState) View(){
fmt.Println("正常")
}
func (r *NormalState) Comment(){
fmt.Println("正常")
}
func (r *NormalState) Post(){
fmt.Println("正常")
}
func main() {
}
// golang状态模式写法会多申明很多对像,但是会减少各种判定操作
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