设计模式 #

/**
 * 原接口，需要传入 orderId，时间
 */
public interface SourceOrderApi {
    public void updateDate(String orderId, String date, String client);
}

public class SourceOrderApiImpl implements SourceOrderApi{
    @Override
    public void updateDate(String orderId, String date, String client) {
        System.out.println(client+"已将订单"+orderId+"的有效期延长至"+date);
    }
}

public class Test {
    public static void main(String[] args) {
        SourceOrderApi sourceOrderApi = new SourceOrderApiImpl();
        sourceOrderApi.updateDate("123456", "2014-10-15", "user");
    }
}


/**
 * 适配器模式
 */
public interface AppOrderApi {
    //只需要传入订单Id即可
    public void updateDate(String orderId, String client);
}

public class AppOrderApiImpl implements AppOrderApi{
    SourceOrderApi sourceOrderApi;
    public AppOrderApiImpl(){
        sourceOrderApi = new SourceOrderApiImpl();
    }

    @Override
    public void updateDate(String orderId,String client) {
        //这里适配的方式随意，但是保证是要完全兼容原有的，就是保证调用原有的接口
        sourceOrderApi.updateDate(orderId, "9999-12-31", client);
    }
}

public class Test {
    public static void main(String[] args) {
        AppOrderApi appOrderApi = new AppOrderApiImpl();
        appOrderApi.updateDate("123456", "user");
    }
}


/**
 * 代理模式
 */
public class ProxySourceOrderApiImpl implements SourceOrderApi {
    SourceOrderApi sourceOrderApi;
    public ProxySourceOrderApiImpl(){
        sourceOrderApi = new SourceOrderApiImpl();
    }

    @Override
    public void updateDate(String orderId, String date, String client) {
        //进行判断，如果是admin则更新否则让其输入账号密码
        if("admin".equals(client)){
            sourceOrderApi.updateDate(orderId, date, client);
        }else{
            System.out.println("账号不是admin，没有查询权限，请输入以admin操作");
        }
    }
}


/**
 * 装饰器模式
 */
public class NewSourceOrderApiImpl implements SourceOrderApi {
    SourceOrderApi sourceOrderApi;
    public NewSourceOrderApiImpl(SourceOrderApi sourceOrderApi){
        this.sourceOrderApi = sourceOrderApi;
    }
    @Override
    public void updateDate(String orderId, String date, String client) {
        sourceOrderApi.updateDate(orderId, date, client);
        System.out.println(client+"已将订单"+orderId+"的退款期延长至"+date);

    }
}