go设计模式-工厂方法

package main

import (
	"errors"
	"fmt"
)

const (
	ACT  = 1
	TASK = 2
)

type Quest struct {
	Id        int
	QuestType int
	Process   int
	Status    int
}

type Questier interface {
	DoAction(Quest)
}

type ActQuest struct {
}

func (a *ActQuest) DoAction(quest Quest) {
	quest.Process += 1
	fmt.Println("act doaction:", quest)
}

type TaskQuest struct {
}

func (t *TaskQuest) DoAction(quest Quest) {
	quest.Process += 10
	fmt.Println("task doaction", quest)

}

// Factory
func GetQuestier(questierType int) (Questier, error) {
	switch questierType {
	case ACT:
		return new(ActQuest), nil
	case TASK:
		return new(TaskQuest), nil
	default:
		return nil, errors.New(fmt.Sprintf("questier type %d not recognized.", questierType))
	}
}

func main()  {
	quest := Quest{1, 1, 0, 0}
	questier, err := GetQuestier(ACT)
	if err == nil {
		questier.DoAction(quest)
	}

	quest2 := Quest{2, 1, 0, 0}
	questier, err = GetQuestier(TASK)
	if err == nil {
		questier.DoAction(quest2)
	}
}
output:
act doaction: {1 1 1 0}
task doaction {2 1 10 0}