软件设计-职责链模式

软件设计                  石家庄铁道大学信息学院

 

实验15：职责链模式

本次实验属于模仿型实验，通过本次实验学生将掌握以下内容：

1、理解职责链模式的动机，掌握该模式的结构；

2、能够利用职责链模式解决实际问题。

 

 

[实验任务一]：财务审批

某物资管理系统中物资采购需要分级审批，主任可以审批1万元及以下的采购单，部门经理可以审批5万元及以下的采购单，副总经理可以审批10万元及以下的采购单，总经理可以审批20万元及以下的采购单，20万元以上的采购单需要开职工大会确定。现用职责链模式设计该系统。

实验要求：

1. 提交类图；

2. 提交源代码；

3. 注意编程规范。

 

1. 类图：

 

 

1. 源代码：

Approver抽象类

package fileshiyan15;

 

public abstract class Approver {

 

   

    Approver approver;

   

    String position;

 

    public Approver(String position) {

        this.position = position;

    }

 

   

 

    public void setApprover(Approver approver) {

        this.approver = approver;

    }

 

   

    public abstract void processRequest(PurchaseRequest purchaseRequest);

}

Approver抽象类

DepartmentManager

package fileshiyan15;

 

public class DepartmentManager extends Approver {

 

    public DepartmentManager(String name) {

        super(name);

    }

 

    @Override

    public void processRequest(PurchaseRequest purchaseRequest) {

        if (purchaseRequest.getPrice() > 10000 && purchaseRequest.getPrice() <= 50000) {

            System.out.println("Request ID => " + purchaseRequest.getId() + " is processed by " + this.position);

        } else {

            approver.processRequest(purchaseRequest);

        }

 

    }

}

Director

package com.gazikel;

 

public class Director extends Approver {

 

    public Director(String name) {

        super(name);

    }

 

    @Override

    public void setApprover(Approver approver) {

        super.setApprover(approver);

    }

 

    @Override

    public void processRequest(PurchaseRequest purchaseRequest) {

        if (purchaseRequest.getPrice() <= 10000) {

            System.out.println("Request ID => " + purchaseRequest.getId() + " is processed by " + this.position);

        } else {

            approver.processRequest(purchaseRequest);

        }

 

    }

}

GeneralManager

package fileshiyan15;

 

public class GeneralManager extends Approver {

 

    public GeneralManager(String name) {

        super(name);

    }

 

 

    @Override

    public void processRequest(PurchaseRequest purchaseRequest) {

        if (purchaseRequest.getPrice() > 100000 && purchaseRequest.getPrice() <= 200000) {

            System.out.println("Request ID => " + purchaseRequest.getId() + " is processed by " + this.position);

        } else {

            System.out.println("Need to convene employee meeting to determine");

        }

 

    }

}

ViceManager

package fileshiyan15;

 

public class ViceManager extends Approver {

 

    public ViceManager(String name) {

        super(name);

    }

 

    @Override

    public void processRequest(PurchaseRequest purchaseRequest) {

        if (purchaseRequest.getPrice() > 50000 && purchaseRequest.getPrice() <= 100000) {

            System.out.println("Request ID => " + purchaseRequest.getId() + " is processed by " + this.position);

        } else {

            approver.processRequest(purchaseRequest);

        }

 

    }

}

PurchaseRequest

package fileshiyan15;

 

public class PurchaseRequest {

 

    private int type;

    private float price;

    private int id;

 

    public PurchaseRequest(int type, float price, int id) {

        this.type = type;

        this.price = price;

        this.id = id;

    }

 

    public int getType() {

        return type;

    }

 

    @Override

    public String toString() {

        return this.getId() + " number of materials" + this.getPrice() + " yuan";

    }

 

    public float getPrice() {

        return price;

    }

 

    public int getId() {

        return id;

    }

}

Client

package fileshiyan15;

 

public class Client {

 

    public static void main(String[] args) {

        PurchaseRequest purchaseRequest1 = new PurchaseRequest(1, 5600, 1);

        PurchaseRequest purchaseRequest2 = new PurchaseRequest(1, 25620, 2);

        PurchaseRequest purchaseRequest3 = new PurchaseRequest(1, 96541, 3);

        PurchaseRequest purchaseRequest4 = new PurchaseRequest(1, 152345, 4);

        PurchaseRequest purchaseRequest5 = new PurchaseRequest(1, 235685, 5);

 

 

        Director director = new Director("Director");

        DepartmentManager departmentManager = new DepartmentManager("Department Manager");

        ViceManager viceManager = new ViceManager("Vice Manager");

        GeneralManager generalManager = new GeneralManager("General Manager");

 

        director.setApprover(departmentManager);

        departmentManager.setApprover(viceManager);

        viceManager.setApprover(generalManager);

 

        System.out.println(purchaseRequest1.toString());

        director.processRequest(purchaseRequest1);

        System.out.println("-------------------------------");

 

        System.out.println(purchaseRequest2.toString());

        director.processRequest(purchaseRequest2);

        System.out.println("-------------------------------");

 

        System.out.println(purchaseRequest3.toString());

        director.processRequest(purchaseRequest3);

        System.out.println("-------------------------------");

 

        System.out.println(purchaseRequest4.toString());

        director.processRequest(purchaseRequest4);

        System.out.println("-------------------------------");

 

        System.out.println(purchaseRequest5.toString());

        director.processRequest(purchaseRequest5);

        System.out.println("-------------------------------");

 

    }

 

}