Компоновщик (Composite) — различия между версиями

class MainApp
{
    static void Main()
    {
        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);
        root.Add(new Leaf("Leaf C"));

        root.Display(1);
    }
}

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);
}

class Composite : Component
{
    List<Component> children = new List<Component>();

    // Constructor
    public Composite(string name): base(name)
    {  }

    public override void Add(Component component)
    {
        children.Add(component);
    }

    public override void Remove(Component component)
    {
        children.Remove(component);
    }

    public override void Display(int depth)
    {
        Console.WriteLine(new String('-', depth) + name);
        foreach (Component component in children)
            component.Display(depth + 2);
    }
}

class Leaf : Component
{
    public Leaf(string name): base(name)
    {  }

    public override void Add(Component c)
    {
        throw new Exception("Cannot add to a leaf");
    }

    public override void Remove(Component c)
    {
        throw new Exception("Cannot remove from a leaf");
    }

    public override void Display(int depth)
    {
        Console.WriteLine(new String('-', depth) + name);
    }
}