Java责任链模式(Chain of responsibility)

/**
 * 封装请假的基本信息
 * @author 波波烤鸭
 *
 */
public class LeaveRequest {
	// 员工名称
	private String empName;
	// 请假天数
	private int leaveDays;
	// 请假原因
	private String reason;
	
	public LeaveRequest(String empName, int leaveDays, String reason) {
		super();
		this.empName = empName;
		this.leaveDays = leaveDays;
		this.reason = reason;
	}
	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 getReason() {
		return reason;
	}
	public void setReason(String reason) {
		this.reason = reason;
	} 
}

/**
 * 抽象类
 * @author 波波烤鸭
 *
 */
public abstract class Leader {
	// 领导姓名
	protected String name;
	// 下一个处理的领导
	protected Leader nextLeader; //责任链上的后继对象
	
	public Leader(String name) {
		super();
		this.name = name;
	}
	
	//设定责任链上的后继对象
	public void setNextLeader(Leader nextLeader) {
		this.nextLeader = nextLeader;
	}
	
	/**
	 * 处理请求的核心的业务方法
	 * @param request
	 */
	public abstract void handleRequest(LeaveRequest request);
}

/**
 * 主任
 * @author 波波烤鸭
 *
 */
public class Director extends Leader {

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

	@Override
	public void handleRequest(LeaveRequest request) {
		if(request.getLeaveDays()<3){
			System.out.println("员工："+request.getEmpName()+"请假，天数："+request.getLeaveDays()+",理由："+request.getReason());
			System.out.println("主任："+this.name+",审批通过！");
		}else{
			if(this.nextLeader!=null){
				this.nextLeader.handleRequest(request);
			}
		}
	}
}

/**
 * 经理
 * @author 波波烤鸭
 *
 */
public class Manager extends Leader {

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

	@Override
	public void handleRequest(LeaveRequest request) {
		if(request.getLeaveDays()<10){
			System.out.println("员工："+request.getEmpName()+"请假，天数："+request.getLeaveDays()+",理由："+request.getReason());
			System.out.println("经理："+this.name+",审批通过！");
		}else{
			if(this.nextLeader!=null){
				this.nextLeader.handleRequest(request);
			}
		}
	}
}

/**
 * 副总经理
 * @author 波波烤鸭
 *
 */
public class ViceGeneralManager extends Leader {

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

	@Override
	public void handleRequest(LeaveRequest request) {
		if(request.getLeaveDays()<20){
			System.out.println("员工："+request.getEmpName()+"请假，天数："+request.getLeaveDays()+",理由："+request.getReason());
			System.out.println("副总经理："+this.name+",审批通过！");
		}else{
			if(this.nextLeader!=null){
				this.nextLeader.handleRequest(request);
			}
		}
	}
}

/**
 * 总经理
 * @author 波波烤鸭
 *
 */
public class GeneralManager extends Leader {

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

	@Override
	public void handleRequest(LeaveRequest request) {
		if(request.getLeaveDays()<30){
			System.out.println("员工："+request.getEmpName()+"请假，天数："+request.getLeaveDays()+",理由："+request.getReason());
			System.out.println("总经理："+this.name+",审批通过！");
		}else{
			System.out.println("莫非"+request.getEmpName()+"想辞职，居然请假"+request.getLeaveDays()+"天！");
		}
	}
}

public static void main(String[] args) {
	Leader a = new Director("张三");
	Leader b = new Manager("李四");
	Leader b2 = new ViceGeneralManager("王五");
	Leader c = new GeneralManager("波波烤鸭");
	//组织责任链对象的关系
	a.setNextLeader(b);
	b.setNextLeader(b2);
	b2.setNextLeader(c);
	
	//开始请假操作
	LeaveRequest req1 = new LeaveRequest("TOM", 15, "老婆生孩子回家探望！");
	a.handleRequest(req1);
}

员工：TOM请假，天数：15,理由：老婆生孩子回家探望！
副总经理：王五,审批通过！