java学习-设计模式-职责链模式

Posted 2021-04-25 菜鸟码农的学习历程

二十：chain of responsibility

1. 需求

   公司请假，加薪，权限不够，向上级请示。

2. 代码实现

请求类：

public class Request {
    private String requestType;
    private String requestContent;
    private int number;

    public String getRequestType() {
        return requestType;
    }

    public void setRequestType(String requestType) {
        this.requestType = requestType;
    }

    public String getRequestContent() {
        return requestContent;
    }

    public void setRequestContent(String requestContent) {
        this.requestContent = requestContent;
    }

    public int getNumber() {
        return number;
    }

    public void setNumber(int number) {
        this.number = number;
    }
}

抽象管理类：

public abstract class Manager {
    private String name;
    private Manager superior;

    public Manager(String name) {
        this.name = name;
    }

    public String getName() {
        return name;
    }

    public Manager getSuperior() {
        return superior;
    }

    public void setSuperior(Manager superior) {
        this.superior = superior;
    }

    public abstract void requestApplications(Request request);
}

经理类：

public class CommonManager extends Manager {

    public CommonManager(String name) {
        super(name);
    }

    @Override
    public void requestApplications(Request request) {
        if ("请假".equals(request.getRequestType()) && request.getNumber() <= 2) {
            System.out.println(super.getName() + ":同意" + request.getRequestContent() + "数量为" + request.getNumber() + "天");
        } else {
            if (super.getSuperior() != null) {
                super.getSuperior().requestApplications(request);
            }
        }
    }
}

总监类：

public class Majordomo extends Manager {

    public Majordomo(String name) {
        super(name);
    }

    @Override
    public void requestApplications(Request request) {
        if ("请假".equals(request.getRequestType()) && request.getNumber() <= 5) {
            System.out.println(super.getName() + ":同意" + request.getRequestContent() + "数量为" + request.getNumber() + "天");
        } else {
            if (super.getSuperior() != null) {
                super.getSuperior().requestApplications(request);
            }
        }
    }
}

总经理类：

public class GeneralManager extends Manager {

    public GeneralManager(String name) {
        super(name);
    }

    @Override
    public void requestApplications(Request request) {
        if ("请假".equals(request.getRequestType())) {
            System.out.println(super.getName() + ":同意" + request.getRequestContent() + "数量为" + request.getNumber() + "天");
        } else if ("加薪".equals(request.getRequestType()) && request.getNumber() <= 500) {
            System.out.println(super.getName() + ":同意" + request.getRequestContent() + "数量为" + request.getNumber() + "元");

        } else if ("加薪".equals(request.getRequestType()) && request.getNumber() > 500){
            System.out.println(super.getName() + ":再说吧," + request.getRequestContent() + "数量为" + request.getNumber() + "元");
        }
    }
}

职责链模式：

        使多个对象都有机会处理请求，从而避免请求的发送者和接受者之间的耦合关系。将这个对象连成一条链，并沿着这条链传递该请求，直到有一个对象处理它为之。