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90 lines
1.3 KiB
Go
90 lines
1.3 KiB
Go
package buidler
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//builder模式适用的场景：无法或者不想一次性把实例的所有属性都给出，而是要分批次、分条件构造
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// 不是这样 a:=SomeStruct{1,2,"hello"}
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//而是这样
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/*
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a:=SomeStruct{}
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a.setAge(1)
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a.setMonth(2)
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if(situation){
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a.setSomething("hello")
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}
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*/
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//builder模式除了上边的形式，还有一种变种，那就是链式(在每个函数最后返回实例自身)
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/*
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a:=SomeStruct{}
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a = a.setAge(1).setMonth(2).setSomething("hello")
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*/
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//生成器接口
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type Builder interface {
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Part1()
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Part2()
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Part3()
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}
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//
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func NewDirector(builder Builder) *Director {
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return &Director{
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builder: builder,
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}
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}
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type Director struct {
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builder Builder
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}
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func (d *Director) Construct() {
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d.builder.Part1()
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d.builder.Part2()
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d.builder.Part3()
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}
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//
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type Builder1 struct {
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result string
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}
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func (b *Builder1) Part1() {
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b.result += "1"
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}
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func (b *Builder1) Part2() {
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b.result += "2"
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}
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func (b *Builder1) Part3() {
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b.result += "3"
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}
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func (b *Builder1) GetResult() string {
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return b.result
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}
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//
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type Builder2 struct {
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result int
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}
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func (b *Builder2) Part1() {
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b.result += 1
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}
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func (b *Builder2) Part2() {
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b.result += 2
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}
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func (b *Builder2) Part3() {
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b.result += 3
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}
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func (b *Builder2) GetResult() int {
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return b.result
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}
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