組合模式

組合模式

組合模式

組合模式

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 Leaf : Component
{

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

public override void Add(Component c)
{
    Console.WriteLine(”Cannot add to leaf”);
}

public override void Remove(Component c)
{
    Console.WriteLine(”Cannot remove from a leaf”);
}

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

}

class Compsite : 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);

    foreach (Component  component in children) 
    {
        component.Display(depth + 2);
    }
}

}

static void Main(string[] args)
{

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);

Composite comp2 = new Composite(”Composite XY”);

comp2.Add(new Leaf(”Leaf XYA”));

comp2.Add(new Leaf(”Leaf XYB”));

comp.Add(comp2);

root.Add(new Leaf(”Leaf C”));

Leaf leaf = new Leaf(”Leaf D”);

root.Add(leaf);

root.Remove(leaf);

root.Display(1);

Console.Read();

}