string name ) : base( name ) {} // Constructor
public
override void Add( Component c )
{ Console.WriteLine("Cannot add to a 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 );
}
}
public class Client
{ public static void Main( string[] args )
{ // Create a tree structure
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" ));
// Recursively display nodes
root.Display( 1 );
}
}
using System;
using System.Text;
using System.Collections;
abstract class Component
{ protected string name;
public Component( string name ) // Constructor
{ this.name = name;
}
abstract public void Add(Component c);
abstract public void Remove( Component c );
abstract public void Display( int depth );
}
class Composite : Component
{private ArrayList children = new ArrayList();
// 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 );
// Display each of the node's children
foreach( Component component in children )
component.Display( depth + 2 );
}
}