public class LeaveRequest {
    private String name;//姓名
    private int num;//請(qǐng)假天數(shù)
    private String content;//請(qǐng)假內(nèi)容
    public LeaveRequest(String name, int num, String content) {
        this.name = name;
        this.num = num;
        this.content = content;
    }
    public String getName() {
        return name;
    }
    public int getNum() {
        return num;
    }
    public String getContent() {
        return content;
    }
}

public abstract class Handler {
    protected final static int NUM_ONE = 1;
    protected final static int NUM_THREE = 3;
    protected final static int NUM_SEVEN = 7;
    //該領(lǐng)導(dǎo)處理的請(qǐng)假天數(shù)區(qū)間
    private int numStart;
    private int numEnd;
    //領(lǐng)導(dǎo)上面還有領(lǐng)導(dǎo)
    private Handler nextHandler;
    //設(shè)置請(qǐng)假天數(shù)范圍 上不封頂
    public Handler(int numStart) {
        this.numStart = numStart;
    }
    //設(shè)置請(qǐng)假天數(shù)范圍
    public Handler(int numStart, int numEnd) {
        this.numStart = numStart;
        this.numEnd = numEnd;
    }
    //設(shè)置上級(jí)領(lǐng)導(dǎo)
    public void setNextHandler(Handler nextHandler){
        this.nextHandler = nextHandler;
    }
    //提交請(qǐng)假條
    public final void submit(LeaveRequest leave){
        if(0 == this.numStart){
            return;
        }
        //如果請(qǐng)假天數(shù)達(dá)到該領(lǐng)導(dǎo)者的處理要求
        if(leave.getNum() >= this.numStart){
            this.handleLeave(leave);
            //如果還有上級(jí) 并且請(qǐng)假天數(shù)超過(guò)了當(dāng)前領(lǐng)導(dǎo)的處理范圍
            if(null != this.nextHandler && leave.getNum() > numEnd){
                this.nextHandler.submit(leave);//繼續(xù)提交
            } else {
                System.out.println("流程結(jié)束");
            }
        }
    }
    //各級(jí)領(lǐng)導(dǎo)處理請(qǐng)假條方法
    protected abstract void handleLeave(LeaveRequest leave);
}

public class Counselor extends Handler {
    public Counselor() {
        //輔導(dǎo)員 處理1-3天的請(qǐng)假
        super(Handler.NUM_ONE, Handler.NUM_THREE);
    }
    @Override
    protected void handleLeave(LeaveRequest leave) {
        System.out.println(leave.getName() + "請(qǐng)假" + leave.getNum() + "天," + leave.getContent() + "。");
        System.out.println("輔導(dǎo)員審批：同意。");
        //也可以在這里設(shè)置下一個(gè)鏈路處理的handler
        //setNextHandler(new Dean());
    }
}
public class Dean extends Handler {
    public Dean() {
        //院長(zhǎng)處理3-7天的請(qǐng)假
        super(Handler.NUM_THREE, Handler.NUM_SEVEN);
    }
    @Override
    protected void handleLeave(LeaveRequest leave) {
        System.out.println(leave.getName() + "請(qǐng)假" + leave.getNum() + "天," + leave.getContent() + "。");
        System.out.println("院長(zhǎng)審批：同意。");
        //也可以在這里設(shè)置下一個(gè)鏈路處理的handler
        //setNextHandler(new CollegeSecretary ());
    }
}
public class CollegeSecretary extends Handler {
    public CollegeSecretary() {
        //學(xué)院書(shū)記處理7天以上的請(qǐng)假
        super(Handler.NUM_SEVEN);
    }
    @Override
    protected void handleLeave(LeaveRequest leave) {
        System.out.println(leave.getName() + "請(qǐng)假" + leave.getNum() + "天," + leave.getContent() + "。");
        System.out.println("學(xué)院書(shū)記審批：同意。");
        //也可以在這里設(shè)置下一個(gè)鏈路處理的handler
        //setNextHandler(null); //最后一個(gè)
    }
}

public class TestClient {
    public static void main(String[] args) {
        //請(qǐng)假條來(lái)一張
        LeaveRequest leave = new LeaveRequest("kaico",8,"身體不適");
        //各級(jí)領(lǐng)導(dǎo)
        Counselor counselor= new Counselor();
        //如果前面handleLeave 方法中設(shè)置了下一個(gè)handler，這里就不需要了，直接提交申請(qǐng)就好了
        Dean dean = new Dean();
        CollegeSecretary collegeSecretary = new CollegeSecretary();
        counselor.setNextHandler(dean);//輔導(dǎo)員的領(lǐng)導(dǎo)是院長(zhǎng)
        dean.setNextHandler(collegeSecretary);//院長(zhǎng)的領(lǐng)導(dǎo)是學(xué)院書(shū)記
        //提交申請(qǐng)
        counselor.submit(leave);
    }
}