import java.util.HashMap;
import java.util.Map;

/**
 * @Auther: Arsenal
 * @Date: 2020-03-16 20:28
 * @Description: 享元模式
 */
public class Flyweight {
    public static void main(String[] args) {
        WebsiteFactory factory = new WebsiteFactory();
        WebSite webSiteNews1 = factory.getWebSiteCategory("新闻");
        webSiteNews1.use(new User("老王"));
        WebSite webSiteNews2 = factory.getWebSiteCategory("新闻");
        webSiteNews2.use(new User("小王"));
        WebSite webSiteblog1 = factory.getWebSiteCategory("博客");
        webSiteblog1.use(new User("老张"));
        WebSite webSiteblog2 = factory.getWebSiteCategory("博客");
        webSiteblog2.use(new User("小张"));

        System.out.println("网站的分类共=" + factory.getWebSiteCount());

    }
}

/**
 * 享元工厂
 */
class WebsiteFactory {
    Map<String, ConcreteWebsite> pool = new HashMap<>();

    //根据网站的类型，返回一个网站, 如果没有就创建一个网站，并放入到池中,并返回
    public WebSite getWebSiteCategory(String type) {
        if (!pool.containsKey(type)) {
            pool.put(type, new ConcreteWebsite(type));
        }
        return pool.get(type);
    }

    //获取网站分类的总数 (池中有多少个网站类型)
    public int getWebSiteCount() {
        return pool.size();
    }
}

/**
 * 抽象的享元角色
 */
abstract class WebSite {
    void use(User user) {
    }
}

/**
 * 具体的享元角色
 */
class ConcreteWebsite extends WebSite {

    //共享的部分，内部状态
    private String type; //网站发布的形式(类型)

    ConcreteWebsite(String type) {
        this.type = type;
    }

    @Override
    void use(User user) {
        System.out.println("网站的发布形式为:" + type + " 在使用中 .. 使用者是" + user.getName());
    }
}

class User {
    String name;

    User(String name) {
        this.name = name;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }
}