mirror of
https://github.com/crazybber/go-pattern-examples.git
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97 lines
1.3 KiB
Go
97 lines
1.3 KiB
Go
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package state
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import "fmt"
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type Week interface {
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Today()
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Next(*DayContext)
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}
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type DayContext struct {
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today Week
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}
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func NewDayContext() *DayContext {
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return &DayContext{
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today: &Sunday{},
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}
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}
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func (d *DayContext) Today() {
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d.today.Today()
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}
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func (d *DayContext) Next() {
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d.today.Next(d)
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}
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type Sunday struct{}
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func (*Sunday) Today() {
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fmt.Printf("Sunday\n")
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}
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func (*Sunday) Next(ctx *DayContext) {
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ctx.today = &Monday{}
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}
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type Monday struct{}
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func (*Monday) Today() {
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fmt.Printf("Monday\n")
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}
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func (*Monday) Next(ctx *DayContext) {
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ctx.today = &Tuesday{}
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}
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type Tuesday struct{}
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func (*Tuesday) Today() {
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fmt.Printf("Tuesday\n")
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}
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func (*Tuesday) Next(ctx *DayContext) {
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ctx.today = &Wednesday{}
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}
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type Wednesday struct{}
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func (*Wednesday) Today() {
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fmt.Printf("Wednesday\n")
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}
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func (*Wednesday) Next(ctx *DayContext) {
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ctx.today = &Thursday{}
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}
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type Thursday struct{}
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func (*Thursday) Today() {
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fmt.Printf("Thursday\n")
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}
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func (*Thursday) Next(ctx *DayContext) {
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ctx.today = &Friday{}
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}
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type Friday struct{}
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func (*Friday) Today() {
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fmt.Printf("Friday\n")
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}
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func (*Friday) Next(ctx *DayContext) {
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ctx.today = &Saturday{}
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}
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type Saturday struct{}
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func (*Saturday) Today() {
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fmt.Printf("Saturday\n")
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}
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func (*Saturday) Next(ctx *DayContext) {
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ctx.today = &Sunday{}
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}
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