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89 lines
1.7 KiB
Go
89 lines
1.7 KiB
Go
/**
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* @Author:zhoutao
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* @Date:2020/12/12 下午4:12
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* @Desc:
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*/
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package visitor
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import "fmt"
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//访问者模式： 可以给一系列对象透明的添加功能，并且把相关代码封装到一个类中
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//对象只要预留访问者接口Accept，则在后期为独享添加功能的时候就不需要改动对象了
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type Customer interface {
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Accept(Visitor)
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}
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type Visitor interface {
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Visit(Customer)
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}
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type CustomerCol struct {
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customers []Customer
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}
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func (c *CustomerCol) Add(customer Customer) {
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c.customers = append(c.customers, customer)
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}
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func (c *CustomerCol) Accept(visitor Visitor) {
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for _, customer := range c.customers {
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customer.Accept(visitor)
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}
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}
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//New EnterpriseCustomer
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func NewEnterpriseCustomer(name string) *EnterpriseCustomer {
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return &EnterpriseCustomer{
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name: name,
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}
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}
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type EnterpriseCustomer struct {
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name string
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}
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func (c *EnterpriseCustomer) Accept(visitor Visitor) {
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visitor.Visit(c)
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}
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//New IndividualCustomer
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func NewIndividualCustomer(name string) *IndividualCustomer {
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return &IndividualCustomer{
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name: name,
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}
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}
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type IndividualCustomer struct {
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name string
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}
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func (i *IndividualCustomer) Accept(visitor Visitor) {
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visitor.Visit(i)
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}
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//
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type ServiceRequestVisitor struct {
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}
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func (s *ServiceRequestVisitor) Visit(customer Customer) {
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switch c := customer.(type) {
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case *EnterpriseCustomer:
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fmt.Printf("serving enterprise customer %s\n", c.name)
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case *IndividualCustomer:
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fmt.Printf("serving Individual customer %s\n", c.name)
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}
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}
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//
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type AnalisisVisitor struct {
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}
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func (*AnalisisVisitor) Visit(customer Customer) {
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switch c := customer.(type) {
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case *EnterpriseCustomer:
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fmt.Printf("analysis enterprise customer %s\n", c.name)
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}
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}
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