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Builder.go
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package main
import (
"fmt"
"math/rand"
)
// import "fmt"
type iBuilder interface {
setAdType()
setAdCountry()
setAdId(adId int)
getAd() ad
}
type ad struct {
adType string
adCountry string
adId int
}
func getBuilder(builderType string) iBuilder {
if builderType == "img" {
return &imgAdBuilder{}
}
if builderType == "video" {
return &videoAdBuilder{}
}
return nil
}
/* Image Add Builder */
type imgAdBuilder struct {
adType string
adCountry string
adId int
}
//func newImgAdBuilder() *imgAdBuilder {
// return &imgAdBuilder{}
//}
func (b *imgAdBuilder) setAdType() {
b.adType = "Image Ad"
}
func (b *imgAdBuilder) setAdCountry() {
b.adCountry = "Canada"
}
func (b *imgAdBuilder) setAdId(adId int) {
b.adId = adId
}
func (b *imgAdBuilder) getAd() ad {
return ad{
adType: b.adType,
adCountry: b.adCountry,
adId: b.adId,
}
}
/* Image Add Builder */
type videoAdBuilder struct {
adType string
adCountry string
adId int
}
//func newVideoAdBuilder() *videoAdBuilder{
// return &videoAdBuilder{}
//}
func (b *videoAdBuilder) setAdType() {
b.adType = "Video Ad"
}
func (b *videoAdBuilder) setAdCountry() {
b.adCountry = "USA"
}
func (b *videoAdBuilder) setAdId(adId int) {
b.adId = adId
}
func (b *videoAdBuilder) getAd() ad {
return ad{
adType: b.adType,
adCountry: b.adCountry,
adId: b.adId,
}
}
/* Director Builder */
type director struct {
builder iBuilder
}
func newDirector(b iBuilder) *director {
return &director{
builder: b,
}
}
func (d *director) setBuilder(b iBuilder) {
d.builder = b
}
func (d *director) buildAd(adId int) ad {
d.builder.setAdType()
d.builder.setAdCountry()
d.builder.setAdId(adId)
return d.builder.getAd()
}
func main() {
imgAdBuilder := getBuilder("img")
videoAdBuilder := getBuilder("video")
/* Img Ad Init */
director := newDirector(imgAdBuilder)
imgAd := director.buildAd(rand.Intn(100000000))
fmt.Printf("Ad Type: %s\n", imgAd.adType)
fmt.Printf("Ad Country %s\n", imgAd.adCountry)
fmt.Printf("Ad Id %d\n", imgAd.adId)
/* Video Ad Init */
director.setBuilder(videoAdBuilder)
videoAd := director.buildAd(rand.Intn(1000000000))
fmt.Printf("\nAd Type: %s\n", videoAd.adType)
fmt.Printf("Ad Country %s\n", videoAd.adCountry)
fmt.Printf("Ad Id %d\n", videoAd.adId)
}