Golang Composite树状对象组合实践

type Component interface {
    Print(indent string)
}

type File struct {
    name string
}

func (f *File) Print(indent string) {
    fmt.Println(indent + "? " + f.name)
}

type Directory struct {
    name     string
    children []Component
}

func (d *Directory) Add(c Component) {
    d.children = append(d.children, c)
}

func (d *Directory) Print(indent string) {
    fmt.Println(indent + "? " + d.name)
    for _, child := range d.children {
        child.Print(indent + "  ")
    }
}

func main() {
    root := &Directory{name: "root"}
    src := &Directory{name: "src"}
    bin := &Directory{name: "bin"}

    root.Add(src)
    root.Add(bin)
    root.Add(&File{name: "README.md"})

    src.Add(&File{name: "main.go"})
    src.Add(&File{name: "utils.go"})

    bin.Add(&File{name: "app.exe"})

    root.Print("")
}

? root
  ? src
    ? main.go
    ? utils.go
  ? bin
    ? app.exe
  ? README.md