学习笔记——责任链模式

模拟实现类:

/**
 *责任链模式: 将处理同一类事务的所有对象按次序连接在一起（就像连成一条锁链一样），
 * 依次去处理待定事务，如果该对象处理不了，就传给其后的对象来处理
 */
public abstract class Leader {
    public Leader(String  name, Leader nextLeader){
        this.name = name;
        this.nextLeader = nextLeader;
    }

    public void setNextLeader(Leader nextLeader){
        this.nextLeader = nextLeader;
    }

    public abstract void handleRequest(LeaveRequest request);

    protected String name;
    protected Leader nextLeader;
}

class Director extends Leader{
    public Director(String name, Leader nextLeader){
        super(name, nextLeader);
    }

    @Override
    public void handleRequest(LeaveRequest request) {
        if(request.getDay() <= 5){
            System.out.println(name + "Director: OK!");
        } else{
            if(nextLeader != null){
                nextLeader.handleRequest(request);
            }
        }
    }
}

class Manager extends Leader{
    public Manager(String name, Leader nextLeader){
        super(name, nextLeader);
    }

    @Override
    public void handleRequest(LeaveRequest request) {
        if(request.getDay() <= 10){
            System.out.println(name + "Manager: OK!");
        } else{
            if(nextLeader != null){
                nextLeader.handleRequest(request);
            }
        }
    }
}

class GeneralManager extends Leader{
    public GeneralManager(String name){
        super(name, null);
    }

    @Override
    public void handleRequest(LeaveRequest request) {
        System.out.println(name + "GeneralManager: OK!");
    }
}

public class LeaveRequest {
    public LeaveRequest(String name, int day, String reason){
        this.name = name;
        this.day = day;
        this.reason = reason;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public int getDay() {
        return day;
    }

    public void setDay(int day) {
        this.day = day;
    }

    public String getReason() {
        return reason;
    }

    public void setReason(String reason) {
        this.reason = reason;
    }

    private String name;
    private int day;
    private String reason;
}

测试类:

public class Test{
    public static void main(String[] args){
        Leader leader1 = new GeneralManager("张三");
        Leader leader2 = new Manager("李四", leader1);
        Leader leader3 = new Director("王五", leader2);
        leader3.handleRequest(new LeaveRequest("小李", 7, "结婚"));
    }
}