1 using System;
2 using System.Collections;
3
4 abstract class Component
5 {
6 protected string strName;
7
8 public Component(string name)
9 {
10 strName = name;
11 }
12
13 abstract public void Add(Component c);
14
15 public abstract void DumpContents();
16
17 // other operations for delete, get, etc.
18 }
19
20 class Composite : Component
21 {
22 private ArrayList ComponentList = new ArrayList();
23
24 public Composite(string s) : base(s) {}
25
26 override public void Add(Component c)
27 {
28 ComponentList.Add(c);
29 }
30
31 public override void DumpContents()
32 {
33 // First dump the name of this composite node
34 Console.WriteLine("Node: {0}", strName);
35
36 // Then loop through children, and get then to dump their contents
37 foreach (Component c in ComponentList)
38 {
39 c.DumpContents();
40 }
41 }
42 }
43
44 class Leaf : Component
45 {
46 public Leaf(string s) : base(s) {}
47
48 override public void Add(Component c)
49 {
50 Console.WriteLine("Cannot add to a leaf");
51 }
52
53 public override void DumpContents()
54 {
55 Console.WriteLine("Node: {0}", strName);
56 }
57 }
58
59 /// <summary>
60 /// Summary description for Client.
61 /// </summary>
62 public class Client
63 {
64 Component SetupTree()
65 {
66 // here we have to create a tree structure,
67 // consisting of composites and leafs.
68 Composite root = new Composite("root-composite");
69 Composite parentcomposite;
70 Composite composite;
71 Leaf leaf;
72
73 parentcomposite = root;
74 composite = new Composite("first level - first sibling - composite");
75 parentcomposite.Add(composite);
76 leaf = new Leaf("first level - second sibling - leaf");
77 parentcomposite.Add(leaf);
78 parentcomposite = composite;
79 composite = new Composite("second level - first sibling - composite");
80 parentcomposite.Add(composite);
81 composite = new Composite("second level - second sibling - composite");
82 parentcomposite.Add(composite);
83
84 // we will leaf the second level - first sibling empty, and start
85 // populating the second level - second sibling
86 parentcomposite = composite;
87 leaf = new Leaf("third level - first sibling - leaf");
88 parentcomposite.Add(leaf);
89
90 leaf = new Leaf("third level - second sibling - leaf");
91 parentcomposite.Add(leaf);
92 composite = new Composite("third level - third sibling - composite");
93 parentcomposite.Add(composite);
94
95 return root;
96 }
97
98 public static int Main(string[] args)
99 {
100 Component component;
101 Client c = new Client();
102 component = c.SetupTree();
103
104 component.DumpContents();
105 return 0;
106 }
107 }
