设计模式——行为型——责任链模式Chain Of Responsibility

news2024/11/26 5:25:20

请求类

public class ApproverRequest {
    private int type;//请求批准的类型
    private float price;//请求的金额
    private int id;//请求的编号
}

审批人抽象类

public abstract class ApproverPerson {
    protected ApproverPerson next;
    protected String name;

    //审批过程
    public abstract void processRequest(ApproverRequest request);
}

教导主任类

public class DepartmentApprover extends ApproverPerson {
    @Override
    public void processRequest(ApproverRequest request) {
        System.out.println("教导主任正在处理批准...");

        if (request.getPrice() <= 5000) {
            System.out.println("请求编号 id= " + request.getId() + " 被教导主任 " + this.name + " 处理");
        } else {
            System.out.println("金额过大，教导主任处理不了，交给院长处理...");
            next.processRequest(request);
        }
    }
}

院长类

public class CollegeApprover extends ApproverPerson {
    @Override
    public void processRequest(ApproverRequest request) {
        System.out.println("院长正在处理批准...");

        if (request.getPrice() > 5000 && request.getPrice() <= 10000) {
            System.out.println("请求编号 id= " + request.getId() + " 被院长 " + this.name + " 处理");
        } else {
            System.out.println("金额过大，院长处理不了，交给副校长处理...");
            next.processRequest(request);
        }
    }
}

副校长类

public class ViceSchoolMasterApprover extends ApproverPerson {
    @Override
    public void processRequest(ApproverRequest request) {
        System.out.println("副校长正在处理批准...");

        if (request.getPrice() > 10000 && request.getPrice() <= 15000) {
            System.out.println("请求编号 id= " + request.getId() + " 被副校长 " + this.name + " 处理");
        } else {
            System.out.println("金额过大，副校长处理不了，交给校长处理...");
            next.processRequest(request);
        }
    }
}

校长类

public class SchoolMasterApprover extends ApproverPerson {
    @Override
    public void processRequest(ApproverRequest request) {
        System.out.println("校长正在处理批准...");

        System.out.println("请求编号 id= " + request.getId() + " 被校长 " + this.name + " 处理");
    }
}

演示类

public class Demo {
    public static void main(String[] args) {
        ApproverRequest request = new ApproverRequest(1, 20000, 1001);
        ApproverPerson department = new DepartmentApprover("张主任");
        ApproverPerson college = new CollegeApprover("李院长");
        ApproverPerson viceSchoolMaster = new ViceSchoolMasterApprover("王副校长");
        ApproverPerson schoolMaster = new SchoolMasterApprover("佟校长");

        //设置当前审批人的指针，指向下一个审批人
        department.setNext(college);
        college.setNext(viceSchoolMaster);
        viceSchoolMaster.setNext(schoolMaster);

        department.processRequest(request);
    }
}

演示结果