设计模式 visitor 实现
golang 设计模式 visitor 代码实现
package visitor
import "fmt"
type Customer interface {
Accept(Visitor)
}
type Visitor interface {
Visit(Customer)
}
type EnterpriseCustomer struct {
name string
}
type CustomerCol struct {
customers []Customer
}
func (c *CustomerCol) Add(customer Customer) {
c.customers = append(c.customers, customer)
}
func (c *CustomerCol) Accept(visitor Visitor) {
for _, customer := range c.customers {
customer.Accept(visitor)
}
}
func NewEnterpriseCustomer(name string) *EnterpriseCustomer {
return &EnterpriseCustomer{
name: name,
}
}
func (c *EnterpriseCustomer) Accept(visitor Visitor) {
visitor.Visit(c)
}
type IndividualCustomer struct {
name string
}
func NewIndividualCustomer(name string) *IndividualCustomer {
return &IndividualCustomer{
name: name,
}
}
func (c *IndividualCustomer) Accept(visitor Visitor) {
visitor.Visit(c)
}
type ServiceRequestVisitor struct{}
func (*ServiceRequestVisitor) Visit(customer Customer) {
switch c := customer.(type) {
case *EnterpriseCustomer:
fmt.Printf("serving enterprise customer %s\n", c.name)
case *IndividualCustomer:
fmt.Printf("serving individual customer %s\n", c.name)
}
}
// only for enterprise
type AnalysisVisitor struct{}
func (*AnalysisVisitor) Visit(customer Customer) {
switch c := customer.(type) {
case *EnterpriseCustomer:
fmt.Printf("analysis enterprise customer %s\n", c.name)
}
}
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