Go设计模式之生成器模式详细讲解

package main
type IBuilder interface {
    setWindowType()
    setDoorType()
    setNumFloor()
    getHouse() House
}
func getBuilder(builderType string) IBuilder {
    if builderType == "normal" {
        return newNormalBuilder()
    }
    if builderType == "igloo" {
        return newIglooBuilder()
    }
    return nil
}

package main
type NormalBuilder struct {
    windowType string
    doorType   string
    floor      int
}
func newNormalBuilder() *NormalBuilder {
    return &NormalBuilder{}
}
func (b *NormalBuilder) setWindowType() {
    b.windowType = "Wooden Window"
}
func (b *NormalBuilder) setDoorType() {
    b.doorType = "Wooden Door"
}
func (b *NormalBuilder) setNumFloor() {
    b.floor = 2
}
func (b *NormalBuilder) getHouse() House {
    return House{
        doorType:   b.doorType,
        windowType: b.windowType,
        floor:      b.floor,
    }
}

package main
type IglooBuilder struct {
    windowType string
    doorType   string
    floor      int
}
func newIglooBuilder() *IglooBuilder {
    return &IglooBuilder{}
}
func (b *IglooBuilder) setWindowType() {
    b.windowType = "Snow Window"
}
func (b *IglooBuilder) setDoorType() {
    b.doorType = "Snow Door"
}
func (b *IglooBuilder) setNumFloor() {
    b.floor = 1
}
func (b *IglooBuilder) getHouse() House {
    return House{
        doorType:   b.doorType,
        windowType: b.windowType,
        floor:      b.floor,
    }
}

type House struct {
    windowType string
    doorType   string
    floor      int
}

package main
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) buildHouse() House {
    d.builder.setDoorType()
    d.builder.setWindowType()
    d.builder.setNumFloor()
    return d.builder.getHouse()
}

package main
import "fmt"
func main() {
    normalBuilder := getBuilder("normal")
    iglooBuilder := getBuilder("igloo")
    director := newDirector(normalBuilder)
    normalHouse := director.buildHouse()
    fmt.Printf("Normal House Door Type: %s\n", normalHouse.doorType)
    fmt.Printf("Normal House Window Type: %s\n", normalHouse.windowType)
    fmt.Printf("Normal House Num Floor: %d\n", normalHouse.floor)
    director.setBuilder(iglooBuilder)
    iglooHouse := director.buildHouse()
    fmt.Printf("\nIgloo House Door Type: %s\n", iglooHouse.doorType)
    fmt.Printf("Igloo House Window Type: %s\n", iglooHouse.windowType)
    fmt.Printf("Igloo House Num Floor: %d\n", iglooHouse.floor)
}