Golang建造者模式详解与实例教学

type User struct {
    name     string
    age      int
    email    string
    address  string
    phone    string
}

type UserBuilder struct {
    user *User
}

func NewUserBuilder() *UserBuilder {
    return &UserBuilder{user: &User{}}
}

func (ub *UserBuilder) Name(name string) *UserBuilder {
    ub.user.name = name
    return ub
}

func (ub *UserBuilder) Age(age int) *UserBuilder {
    ub.user.age = age
    return ub
}

func (ub *UserBuilder) Email(email string) *UserBuilder {
    ub.user.email = email
    return ub
}

func (ub *UserBuilder) Address(address string) *UserBuilder {
    ub.user.address = address
    return ub
}

func (ub *UserBuilder) Phone(phone string) *UserBuilder {
    ub.user.phone = phone
    return ub
}

func (ub *UserBuilder) Build() (*User, error) {
    if ub.user.name == "" {
        return nil, fmt.Errorf("name is required")
    }
    // 可添加更多校验逻辑
    return ub.user, nil
}

user, err := NewUserBuilder().
    Name("Alice").
    Age(25).
    Email("alice@example.com").
    Build()
if err != nil {
    log.Fatal(err)
}
fmt.Printf("%+v\n", user)

type UserBuilderInterface interface {
    Name(string) UserBuilderInterface
    Age(int) UserBuilderInterface
    Email(string) UserBuilderInterface
    Build() (*User, error)
}