Go语言设计模式实战：建造者模式详解

package main

import "fmt"

// 需要构建的房屋结构体
type house struct {
	windowType string
	doorType   string
	floor      int
}

// 建造者接口定义
type iBuilder interface {
	setWindowType()
	setDoorType()
	setNumFloor()
	getHouse() house
}

// 石头房建造者类
type stoneBuilder struct {
	house
}

func newStoneBuilder() *stoneBuilder {
	return &stoneBuilder{}
}

func (b *stoneBuilder) setWindowType() {
	b.windowType = "Stone Window"
}

func (b *stoneBuilder) setDoorType() {
	b.doorType = "Stone Door"
}

func (b *stoneBuilder) setNumFloor() {
	b.floor = 1
}

func (b *stoneBuilder) getHouse() house {
	return b.house
}

// 木屋建造者类
type woodenBuilder struct {
	house
}

func newWoodenBuilder() *woodenBuilder {
	return &woodenBuilder{}
}

func (b *woodenBuilder) setWindowType() {
	b.windowType = "Wooden Window"
}

func (b *woodenBuilder) setDoorType() {
	b.doorType = "Wooden Door"
}

func (b *woodenBuilder) setNumFloor() {
	b.floor = 2
}

func (b *woodenBuilder) getHouse() house {
	return b.house
}

// 主管类，控制建造流程
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()
}

// 示例执行
func main() {
	stoneBuilder := newStoneBuilder()
	director := newDirector(stoneBuilder)
	fmt.Printf("Stone House: %+v\n", director.buildHouse())

	woodenBuilder := newWoodenBuilder()
	director.setBuilder(woodenBuilder)
	fmt.Printf("Wooden House: %+v\n", director.buildHouse())
}