设计模式 composite 实现
golang 设计模式 composite 代码实现
package composite
import "fmt"
type Component interface {
Parent() Component
SetParent(Component)
Name() string
SetName(string)
AddChild(Component)
Print(string)
}
const (
LeafNode = iota
CompositeNode
)
func NewComponent(kind int, name string) Component {
var c Component
switch kind {
case LeafNode:
c = NewLeaf()
case CompositeNode:
c = NewComposite()
}
c.SetName(name)
return c
}
type component struct {
parent Component
name string
}
func (c *component) Parent() Component {
return c.parent
}
func (c *component) SetParent(parent Component) {
c.parent = parent
}
func (c *component) Name() string {
return c.name
}
func (c *component) SetName(name string) {
c.name = name
}
func (c *component) AddChild(Component) {}
func (c *component) Print(string) {}
type Leaf struct {
component
}
func NewLeaf() *Leaf {
return &Leaf{}
}
func (c *Leaf) Print(pre string) {
fmt.Printf("%s-%s\n", pre, c.Name())
}
type Composite struct {
component
childs []Component
}
func NewComposite() *Composite {
return &Composite{
childs: make([]Component, 0),
}
}
func (c *Composite) AddChild(child Component) {
child.SetParent(c)
c.childs = append(c.childs, child)
}
func (c *Composite) Print(pre string) {
fmt.Printf("%s+%s\n", pre, c.Name())
pre += " "
for _, comp := range c.childs {
comp.Print(pre)
}
}
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