GOF23设计模式之责任链模式（chain of responsibility）之实现



/** * 请假条 * 封装请假的信息。 */package com.bjsxt.cn.chainOfResponsibility;

public class LeaveRequest { private String empName; private int leaveDays; private String reasons;  public LeaveRequest(String empName, int leaveDays, String reasons) {  super();  this.empName = empName;  this.leaveDays = leaveDays;  this.reasons = reasons; }

 public String getEmpName() {  return empName; }

 public void setEmpName(String empName) {  this.empName = empName; }

 public int getLeaveDays() {  return leaveDays; }

 public void setLeaveDays(int leaveDays) {  this.leaveDays = leaveDays; }

 public String getReasons() {  return reasons; }

 public void setReasons(String reasons) {  this.reasons = reasons; } @Override public String toString() {    return "雇员：" + empName + "请假，天数：" + leaveDays + "，请假理由：" + reasons; }}

/** * 抽象类Leader，在请假的流程之中，把审批人员 * 主任，经理，总经理，抽象成一个类，他们 * 具有相同的功能，审批。handleRequest * 2015年4月9日14:40:49 *  */package com.bjsxt.cn.chainOfResponsibility;

public abstract class Leader { protected String name; protected Leader nextLeader;  public Leader(String name) {  super();  this.name = name; }

 public void setNextLeader(Leader nextLeader) {  this.nextLeader = nextLeader; }  public abstract void handleRequest(LeaveRequest request); public abstract String check();}

/** * 主任类： *  如果请假天数小于3天，主任审批 * 2015年4月9日14:43:36 */package com.bjsxt.cn.chainOfResponsibility;

public class Director extends Leader {

 public Director(String name) {  super(name); }

 @Override public void handleRequest(LeaveRequest request) {  if (request.getLeaveDays() < 3) {   System.out.println("雇员名字：" + request.getEmpName() +"请假，天数为：" + request.getLeaveDays() +"请假原因为" +request.getReasons());   System.out.println(check());  } else {   if (this.nextLeader != null) {    this.nextLeader.handleRequest(request);   }  } }

 @Override public String check() {  return "主任：" + name + "审批通过!";   }  }

/** * 时间：2015年4月9日14:48:13 * 经理类： 如果请假条数大于等于3天，小于十天，经理审批 */package com.bjsxt.cn.chainOfResponsibility;

public class Manager extends Leader {

  public Manager(String name) {  super(name); }  @Override public void handleRequest(LeaveRequest request) {  if (request.getLeaveDays() <10) {   System.out.println(request.toString());   System.out.println(check());  } else {   if (this.nextLeader != null) {    this.nextLeader.handleRequest(request);   }  } }

 @Override public String check() {  return "经理：" + name + "审批通过"; }

}

/** * 总经理： 如果大于等于十天，小于三十天，总经理审批 * 时间：2015年4月9日14:53:41 */package com.bjsxt.cn.chainOfResponsibility;

public class GeneralManager extends Leader {

 public GeneralManager(String name) {  super(name); }   @Override public void handleRequest(LeaveRequest request) {  if (request.getLeaveDays() < 30) {   System.out.println(request.toString());   System.out.println(check());  } else {   System.out.println(request.toString() + "莫非想辞职，不批准");  } }

 @Override public String check() {  return "总经理 :" + name +"审核通过"; }

}

/** * 2015年4月9日14:59:50 * 测试程序：测试责任链模式的使用 * 我们使用责任链模式而不是非常繁冗复杂的ifelse结构，是为了扩展时的方便。 * 例如，此时，我们如果想要加入一位副总经理，来处理10到20天的假条审核 * 我们只需要加入新的类ViceGeneralManager，在客户程序中创建新的责任链即可。 * 这样符合OCP原则，即开闭原则。 */package com.bjsxt.cn.chainOfResponsibility;

public class Client { public static void main(String[] args) {  LeaveRequest l1 = new LeaveRequest("杰伦", 1, "旅游");  LeaveRequest l2 = new LeaveRequest("张靓颖", 8, "恋爱");  LeaveRequest l3 = new LeaveRequest("夏洛蒂", 15, "失恋了");  LeaveRequest l4 = new LeaveRequest("巴赫", 37, "在家带孩子");    Leader ll1 = new Director("张主任");  Leader ll2 = new Manager("李经理");  Leader ll3 = new GeneralManager("王总经理");  //创建责任链  ll1.setNextLeader(ll2);  ll2.setNextLeader(ll3);    ll1.handleRequest(l1);  ll1.handleRequest(l2);  ll1.handleRequest(l3);  ll1.handleRequest(l4);   }}/*雇员名字：杰伦请假，天数为：1请假原因为旅游主任：张主任审批通过!雇员：张靓颖请假，天数：8，请假理由：恋爱经理：李经理审批通过雇员：夏洛蒂请假，天数：15，请假理由：失恋了总经理 :王总经理审核通过雇员：巴赫请假，天数：37，请假理由：在家带孩子莫非想辞职，不批准

 *  *  */

/** * 加入副总经理处理十天到二十天的假条审核 * 2015年4月9日15:12:46 */package com.bjsxt.cn.chainOfResponsibility;

public class ViceGeneralManager extends Leader{

 public ViceGeneralManager(String name) {  super(name); }

 @Override public void handleRequest(LeaveRequest request) {  if (request.getLeaveDays() < 20) {   System.out.println(request.toString());   System.out.println(check());  } else {   if (this.nextLeader != null) {    this.nextLeader.handleRequest(request);   }  } }

 @Override public String check() {  return "副总经理：" + name + "审核通过"; }

}

/** * 增加ViceGeneralManager类之后稍作调整就可以加入加入该类之后的新的责任链。 */package com.bjsxt.cn.chainOfResponsibility;

public class Client2 { public static void main(String[] args) {  LeaveRequest l1 = new LeaveRequest("杰伦", 1, "旅游");  LeaveRequest l2 = new LeaveRequest("张靓颖", 8, "恋爱");  LeaveRequest l3 = new LeaveRequest("夏洛蒂", 15, "失恋了");  LeaveRequest l4 = new LeaveRequest("巴赫", 37, "在家带孩子");    Leader ll1 = new Director("张主任");  Leader ll2 = new Manager("李经理");  Leader ll22 = new ViceGeneralManager("王副总经理");  Leader ll3 = new GeneralManager("王总经理");    //创建责任链  ll1.setNextLeader(ll2);  ll2.setNextLeader(ll22);  ll22.setNextLeader(ll3);    ll1.handleRequest(l1);  ll1.handleRequest(l2);  ll1.handleRequest(l3);  ll1.handleRequest(l4);   }}/* * 雇员名字：杰伦请假，天数为：1请假原因为旅游主任：张主任审批通过!雇员：张靓颖请假，天数：8，请假理由：恋爱经理：李经理审批通过雇员：夏洛蒂请假，天数：15，请假理由：失恋了副总经理：王副总经理审核通过雇员：巴赫请假，天数：37，请假理由：在家带孩子莫非想辞职，不批准

 *  * */