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设计模式-组合模式

发表于 更新于 分类于 Valine：
本文字数： 1.5k 阅读时长 ≈ 1 分钟

用于把一组相似的对象当作一个单一的对象

组合模式

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//Component
abstract class Component
{
    protected string name;
    public Component(string name)
    {
        this.name = name;
    }
    public abstract void Add(Component c);
    public abstract void Remove(Component c);
    public abstract void Display(int depth);
}
//Leaf 叶节点
class Leaf : Component
{
    public Leaf(string name) : base(name)
    {}
    public override void Add(Component c)
    {
        Console.WriteLine("Can not add to a leaf");
    }
    public override void Remove(Component c)
    {
        Console.WriteLine("Can not remove from a leaf");
    }
    public override void Display(int depth)
    {
        Console.WriteLine(new String('-', depth) + "name");
    }
}
//Composite 枝节点 用于存储子部件
class Composite : Component
{
    private List<Component> children = new List<Component>();
    public Composite(string name) : base(name)
    {}
    public override void Add(Component c)
    {
        children.Add(c);
    }
    public override void Remove(Component c)
    {
        children.Remove(c);
    }
    public override void Display(int depth)
    {
        Console.WriteLine(new String('-', depth) + "name");
        children.Foreach(c.Display(depth + 2);)
    }
}
//Client
Composite root = new Composite("root");
root.Add(new Leaf("Leaf A"));
root.Add(new Leaf("Leaf B"));

Composite comp = new Composite("Composite X");
comp.Add(new Leaf("Leaf XA"));
comp.Add(new Leaf("Leaf XB"));
root.Add(comp);