[数据结构与算法]责任链模式

z责任链模式:

1. 新建请求
2. 新建各级主管
3. 新建各级主管建立链表
4. 初级主管开始 判断能否处理

public class AbstractLeaveHandler {
    /**直接主管审批处理的请假天数*/
    protected int MIN = 1;
    /**部门经理处理的请假天数*/
    protected int MIDDLE = 3;
    /**总经理处理的请假天数*/
    protected int MAX = 30;

    /**领导名称*/
    protected String handlerName;

    /**下一个处理节点（即更高级别的领导）*/
    protected AbstractLeaveHandler nextHandler;

    /**设置下一节点*/
    protected void setNextHandler(AbstractLeaveHandler handler){
        this.nextHandler = handler;
    }

    /**处理请假的请求，子类实现*/
    protected void handlerRequest(LeaveRequest request){

    }
}



//直接主管
public class DirectLeaderLeaveHandler extends AbstractLeaveHandler{
    public DirectLeaderLeaveHandler(String name) {
        this.handlerName = name;
    }

    @Override
    protected void handlerRequest(LeaveRequest request) {
        if(request.getLeaveDays() <= this.MIN){
            System.out.println("直接主管:" + handlerName + ",已经处理;流程结束。");
            return;
        }

        if(null != this.nextHandler){
            this.nextHandler.handlerRequest(request);
        }else{
            System.out.println("审批拒绝！");
        }

    }
}

//部门经理
public class DeptManagerLeaveHandler extends AbstractLeaveHandler{
    public DeptManagerLeaveHandler(String name) {
        this.handlerName = name;
    }

    @Override
    protected void handlerRequest(LeaveRequest request) {
        if(request.getLeaveDays() >this.MIN && request.getLeaveDays() <= this.MIDDLE){
            System.out.println("部门经理:" + handlerName + ",已经处理;流程结束。");
            return;
        }

        if(null != this.nextHandler){
            this.nextHandler.handlerRequest(request);
        }else{
            System.out.println("审批拒绝！");
        }
    }
}

//总经理
public class GManagerLeaveHandler extends AbstractLeaveHandler{
    public GManagerLeaveHandler(String name) {
        this.handlerName = name;
    }

    @Override
    protected void handlerRequest(LeaveRequest request) {
        if(request.getLeaveDays() > this.MIDDLE && request.getLeaveDays() <= this.MAX){
            System.out.println("总经理:" + handlerName + ",已经处理;流程结束。");
            return;
        }

        if(null != this.nextHandler){
            this.nextHandler.handlerRequest(request);
        }else{
            System.out.println("审批拒绝！");
        }
    }

}

//请求
public class LeaveRequest {
	
    //请求天数和名字
    private int leaveDays;
    private String name;
}

//客户端
public class ResponsibilityTest {
    public static void main(String[] args) {
        LeaveRequest request = LeaveRequest.builder().leaveDays(5).name("小明").build();


        AbstractLeaveHandler directLeaderLeaveHandler = new DirectLeaderLeaveHandler("县令");
        DeptManagerLeaveHandler deptManagerLeaveHandler = new DeptManagerLeaveHandler("知府");
        GManagerLeaveHandler gManagerLeaveHandler = new GManagerLeaveHandler("京兆尹");

        directLeaderLeaveHandler.setNextHandler(deptManagerLeaveHandler);
        deptManagerLeaveHandler.setNextHandler(gManagerLeaveHandler);

        directLeaderLeaveHandler.handlerRequest(request);


    }
}