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Go言語で factory method パターンを書いてみる

Last updated at Posted at 2018-11-26

正しいか分かりませんが、Go言語でfactory method パターンを書いてみました。

factory.go
package main

import "fmt"

// created struct
type PersonStruct struct {
    Name string
}
type Person interface {
    GetZikoshoukai() string
}

type Man struct {
    PersonStruct
}
func (man *Man) GetZikoshoukai() string {
    return man.Name + "だぜ!"
}

type Woman struct{
    PersonStruct
}
func (woman *Woman) GetZikoshoukai() string {
    return woman.Name + "よ!"
}

// factory
type Factory interface {
    CreateInstance(name string) Person
}

type ManFactory struct {}
func (factory *ManFactory) CreateInstance(name string) Person {
    man := new(Man)
    man.Name = name
    var person Person = man
    return person
}

type WomanFactory struct {}
func (factory *WomanFactory) CreateInstance(name string) Person {
    woman := new(Woman)
    woman.Name = name
    var person Person = woman
    return person
}

// entry point
func main() {
    var factory Factory = new(ManFactory)
    man := factory.CreateInstance("ひろし")
    fmt.Println(man.GetZikoshoukai())

    factory = new(WomanFactory)
    woman := factory.CreateInstance("なおこ")
    fmt.Println(woman.GetZikoshoukai())
}

クラスで言うと、Personが親クラスでManとWomanが子クラスということになります。

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