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@yanjinbin
Forked from vaskoz/builder.go
Created August 31, 2017 03:01
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Golang Builder pattern
package main
import "strconv"
import "fmt"
type Color string
type Make string
type Model string
const (
BLUE Color = "blue"
RED = "red"
)
type Car interface {
Drive() string
Stop() string
}
type CarBuilder interface {
TopSpeed(int) CarBuilder
Paint(Color) CarBuilder
Build() Car
}
type carBuilder struct {
speedOption int
color Color
}
func (cb *carBuilder) TopSpeed(speed int) CarBuilder {
cb.speedOption = speed
return cb
}
func (cb *carBuilder) Paint(color Color) CarBuilder {
cb.color = color
return cb
}
func (cb *carBuilder) Build() Car {
return &car{
topSpeed: cb.speedOption,
color: cb.color,
}
}
func New() CarBuilder {
return &carBuilder{}
}
type car struct {
topSpeed int
color Color
}
func (c *car) Drive() string {
return "Driving at speed: " + strconv.Itoa(c.topSpeed)
}
func (c *car) Stop() string {
return "Stopping a " + string(c.color) + " car"
}
func main() {
builder := New()
car := builder.TopSpeed(50).Paint(BLUE).Build()
fmt.Println(car.Drive())
fmt.Println(car.Stop())
}
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