1 #include <iostream>
2 #include <string>
3
4 using namespace std;
5
6
7 class Handler
8 {
9 public:
10 Handler(Handler* pstHandler): m_pstHandler(pstHandler)
11 {
12
13 }
14
15 virtual void HandleRequest(int request) = 0;
16
17 protected:
18 Handler* m_pstHandler;
19 };
20
21 class ConcreteHandler1: public Handler
22 {
23 public:
24 ConcreteHandler1(Handler* pstHandler): Handler(pstHandler)
25 {
26
27 }
28
29 virtual void HandleRequest(int request)
30 {
31 if (request < 7)
32 {
33 cout<< "组长：批假"<< request<< "天"<< endl;
34 }
35 else
36 {
37 m_pstHandler->HandleRequest(request);
38 }
39 }
40 };
41
42 class ConcreteHandler2: public Handler
43 {
44 public:
45 ConcreteHandler2(Handler* pstHandler): Handler(pstHandler)
46 {
47
48 }
49
50 virtual void HandleRequest(int request)
51 {
52 if (request < 15)
53 {
54 cout<< "总监：批假"<< request<< "天"<< endl;
55 }
56 else
57 {
58 m_pstHandler->HandleRequest(request);
59 }
60 }
61 };
62
63 class ConcreteHandler3: public Handler
64 {
65 public:
66 ConcreteHandler3(Handler* pstHandler): Handler(pstHandler)
67 {
68
69 }
70
71 virtual void HandleRequest(int request)
72 {
73 if (request < 30)
74 {
75 cout<< "经理：批假"<< request<< "天"<< endl;
76 }
77 else
78 {
79 cout<< "经理："<< request<< "天，时间太长，超过公司规定"<< endl;
80 }
81 }
82 };
83
84 int main(int argc, char* argv[])
85 {
86 Handler* jingli = new ConcreteHandler3(NULL);
87 Handler* zongjian = new ConcreteHandler2(jingli);
88 Handler* zuzhang = new ConcreteHandler1(zongjian);
89
90 zuzhang->HandleRequest(12);
91 zuzhang->HandleRequest(15);
92 zuzhang->HandleRequest(5);
93 zuzhang->HandleRequest(31);
94
95 delete jingli;
96 delete zongjian;
97 delete zuzhang;
98
99 return 0;
100 }
101 //////////////////////////////////
102 [root@ ~/learn_code/design_pattern/20_chain]$ ./chain
103 总监：批假12天
104 经理：批假15天
105 组长：批假5天
106 经理：31天，时间太长，超过公司规定
