Golang实现组合模式和装饰模式实例详解

package main

type Component interface {
    search(string)
}

package main

import "fmt"

type File struct {
    name string
}

func (f *File) search(keyword string) {
    fmt.Printf("Searching for keyword %s in file %s\n", keyword, f.name)
}

func (f *File) getName() string {
    return f.name
}

package main

import "fmt"

type Folder struct {
    components []Component
    name       string
}

func (f *Folder) search(keyword string) {
    fmt.Printf("Serching recursively for keyword %s in folder %s\n", keyword, f.name)
    for _, composite := range f.components {
        composite.search(keyword)
    }
}

func (f *Folder) add(c Component) {
    f.components = append(f.components, c)
}

package main

func main() {
    file1 := &File{name: "File1"}
    file2 := &File{name: "File2"}
    file3 := &File{name: "File3"}

    folder1 := &Folder{
        name: "Folder1",
    }

    folder1.add(file1)

    folder2 := &Folder{
        name: "Folder2",
    }
    folder2.add(file2)
    folder2.add(file3)
    folder2.add(folder1)

    folder2.search("rose")
}

package main

type IPizza interface {
    getPrice() int
}

package main

type VeggeMania struct {
}

func (p *VeggeMania) getPrice() int {
    return 15
}

package main

type TomatoTopping struct {
    pizza IPizza
}

func (c *TomatoTopping) getPrice() int {
    pizzaPrice := c.pizza.getPrice()
    return pizzaPrice + 7
}

package main

type CheeseTopping struct {
    pizza IPizza
}

func (c *CheeseTopping) getPrice() int {
    pizzaPrice := c.pizza.getPrice()
    return pizzaPrice + 10
}

package main

import "fmt"

func main() {

    // 定义匹萨
    pizza := &VeggeMania{}

    // 增加奶酪
    pizzaWithCheese := &CheeseTopping{
        pizza: pizza,
    }

    // 增加番茄
    pizzaWithCheeseAndTomato := &TomatoTopping{
        pizza: pizzaWithCheese,
    }

    fmt.Printf("Price of veggeMania with tomato and cheese topping is %d\n", pizzaWithCheeseAndTomato.getPrice())
}