设计模式_责任链

责任链模式

介绍

类图

AbstractTeacher： 抽象类

CurrentTeacher： 上课老师

ClassTeacher： 班主任

Headmaster： 校长

StudentContext:请假条

代码

AbstractTeacher

 
public abstract class AbstractTeacher
{
    // 灵活可变审核顺序
    protected AbstractTeacher next;
 
    // 设置上级
    public void SetNextAuditPeople(AbstractTeacher next)
    {
        this.next = next;
    }
 
    // 审核
    public abstract void Audit(StudentContext context);
 
}

CurrentTeacher

using UnityEngine;
 
public class CurrentTeacher : AbstractTeacher
{
    // 时间
    int maxDate = 3;
    // 姓名
    string name = "当前上课老师";
 
    public override void Audit(StudentContext context)
    {
        // 是否通过
        if (context.GetDate() <= maxDate)
        {
            context.isOK = true;
            Debug.Log(name + "：批准.");
        }
        else
        {
            Debug.Log(name + "：无权限.");
        }
 
        // 没有通过：传给上级
        if (context.isOK != true)
        {
            if (null != next)
                next.Audit(context);
            else
                Debug.Log("没有上级联系人！");
        }
    }
}

ClassTeacher 

using UnityEngine;
 
public class ClassTeacher : AbstractTeacher
{
    // 时间
    int maxDate = 14;
    // 姓名
    string name = "班主任";
 
    public override void Audit(StudentContext context)
    {
        // 是否通过
        if (context.GetDate() <= maxDate)
        {
            context.isOK = true;
            Debug.Log(name + "：批准.");
 
        }
        else
        {
            Debug.Log(name + "：无权限.");
        }
 
        // 没有通过：传给上级
        if (context.isOK != true)
        {
            if (null != next)
                next.Audit(context);
            else
                Debug.Log("没有上级联系人！");
        }
    }
}

Headmaster 

using UnityEngine;
 
public class Headmaster : AbstractTeacher
{
    // 时间
    int maxDate = 30;
    // 姓名
    string name = "校长";
 
    public override void Audit(StudentContext context)
    {
        // 是否通过
        if (context.GetDate() <= maxDate)
        {
            context.isOK = true;
            Debug.Log(name + "：批准.");
        }
        else
        {
            Debug.Log(name + "：无权限.");
        }
 
        // 没有通过：传给上级
        if (context.isOK != true)
        {
            if (null != next)
                next.Audit(context);
            else
                Debug.Log("没有上级联系人！");
        }
    }
 
}

StudentContext // 假条

using UnityEngine;
 
public class StudentContext
{
    public bool isOK = false;
 
    string name = "学生A";
    int date = 0;
    
    private StudentContext(){}
 
    public StudentContext(string name, int date)
    {
        this.name = name;
        this.date = date;
    }
 
    public int GetDate()
    {
        return date;
    }
}

测试代码

  // 运行
    void Start()
    {
        // 请假条
        StudentContext sc = new StudentContext("小强", 29);
 
        // 老师
        AbstractTeacher teacher1 = new CurrentTeacher();
        AbstractTeacher teacher2 = new ClassTeacher();
        AbstractTeacher teacher3 = new Headmaster();
        // 设计上级
        {
            teacher1.SetNextAuditPeople(teacher2);
            teacher2.SetNextAuditPeople(teacher3);
        }
      
        // 请假
        teacher1.Audit(sc);
    }

运行结果：