【GOF23设计模式】责任链模式

 1 package com.test.chainOfResp;
 2 /**
 3  * 封装请假的基本信息
 4  */
 5 public class LeaveRequest {
 6     private String empName;
 7     private int leaveDays;
 8     private String reason;
 9 
10     public LeaveRequest(String empName, int leaveDays, String reason) {
11         super();
12         this.empName = empName;
13         this.leaveDays = leaveDays;
14         this.reason = reason;
15     }
16 
17     public String getEmpName() {
18         return empName;
19     }
20 
21     public void setEmpName(String empName) {
22         this.empName = empName;
23     }
24 
25     public int getLeaveDays() {
26         return leaveDays;
27     }
28 
29     public void setLeaveDays(int leaveDays) {
30         this.leaveDays = leaveDays;
31     }
32 
33     public String getReason() {
34         return reason;
35     }
36 
37     public void setReason(String reason) {
38         this.reason = reason;
39     }
40 }

 1 package com.test.chainOfResp;
 2 /**
 3  * 抽象类
 4  */
 5 public abstract class Leader {
 6     protected String name;
 7     protected Leader nextLeader;//责任链上的后继对象
 8 
 9     public Leader(String name) {
10         super();
11         this.name = name;
12     }
13     //设定责任链上的后继对象
14     public void setNextLeader(Leader nextLeader) {
15         this.nextLeader = nextLeader;
16     }
17 
18     /**
19      * 处理请求的核心的业务方法
20      * @param leaveRequest
21      */
22     public abstract void handleRequest(LeaveRequest leaveRequest);
23 }

 1 package com.test.chainOfResp;
 2 /**
 3  * 主任
 4  */
 5 public class Director extends Leader{
 6 
 7     public Director(String name) {
 8         super(name);
 9     }
10 
11     @Override
12     public void handleRequest(LeaveRequest leaveRequest) {
13         if(leaveRequest.getLeaveDays() < 3){
14             System.out.println("员工："+leaveRequest.getEmpName()+"请假，天数："+leaveRequest.getLeaveDays()+"，理由："+leaveRequest.getReason());
15             System.out.println("主任："+this.name+"，审批通过！");
16         }else{
17             if(this.nextLeader != null){
18                 this.nextLeader.handleRequest(leaveRequest);
19             }
20         }
21     }
22 }

 1 package com.test.chainOfResp;
 2 /**
 3  * 经理
 4  */
 5 public class Manager extends Leader{
 6 
 7     public Manager(String name) {
 8         super(name);
 9     }
10 
11     @Override
12     public void handleRequest(LeaveRequest leaveRequest) {
13         if(leaveRequest.getLeaveDays() < 10){
14             System.out.println("员工："+leaveRequest.getEmpName()+"请假，天数："+leaveRequest.getLeaveDays()+"，理由："+leaveRequest.getReason());
15             System.out.println("经理："+this.name+"，审批通过！");
16         }else{
17             if(this.nextLeader != null){
18                 this.nextLeader.handleRequest(leaveRequest);
19             }
20         }
21     }
22 }

 1 package com.test.chainOfResp;
 2 /**
 3  * 总经理
 4  */
 5 public class GeneralManager extends Leader{
 6 
 7     public GeneralManager(String name) {
 8         super(name);
 9     }
10 
11     @Override
12     public void handleRequest(LeaveRequest leaveRequest) {
13         if(leaveRequest.getLeaveDays() < 30){
14             System.out.println("员工："+leaveRequest.getEmpName()+"请假，天数："+leaveRequest.getLeaveDays()+"，理由："+leaveRequest.getReason());
15             System.out.println("总经理："+this.name+"，审批通过！");
16         }else{
17             System.out.println("莫非"+leaveRequest.getEmpName()+"想辞职，居然请假"+leaveRequest.getLeaveDays()+"天！");
18         }
19     }
20 }

 1 package com.test.chainOfResp;
 2 /**
 3  * 副总经理
 4  */
 5 public class ViceGeneralManager extends Leader{
 6 
 7     public ViceGeneralManager(String name) {
 8         super(name);
 9     }
10 
11     @Override
12     public void handleRequest(LeaveRequest leaveRequest) {
13         if(leaveRequest.getLeaveDays() < 20){
14             System.out.println("员工："+leaveRequest.getEmpName()+"请假，天数："+leaveRequest.getLeaveDays()+"，理由："+leaveRequest.getReason());
15             System.out.println("副总经理："+this.name+"，审批通过！");
16         }else{
17             if(this.nextLeader != null){
18                 this.nextLeader.handleRequest(leaveRequest);
19             }
20         }
21     }
22 }

 1 package com.test.chainOfResp;
 2 
 3 public class Client {
 4     public static void main(String[] args) {
 5         Leader a = new Director("张三");
 6         Leader b = new Manager("李四");
 7         Leader b2 = new ViceGeneralManager("李小四");//新增逻辑，副总经理
 8         Leader c = new GeneralManager("王五");
 9 
10         //组织责任链对象的关系
11         a.setNextLeader(b);
12         b.setNextLeader(b2);//新增关系
13         b2.setNextLeader(c);
14 
15         //开始请假操作
16         LeaveRequest leaveRequest = new LeaveRequest("Tom", 15, "回英国老家探亲！");
17         a.handleRequest(leaveRequest);
18 
19     }
20 }

控制台输出：
员工：Tom请假，天数：15，理由：回英国老家探亲！
副总经理：李小四，审批通过！