Java/w11/datacollect/strategy/StrategyFactory.java

package com.example.datacollect.strategy;

import java.util.ArrayList;
import java.util.List;

public class StrategyFactory {
    private final List<CrawlStrategy> strategies = new ArrayList<>();

    public StrategyFactory() {
        strategies.add(new HnuNewsStrategy());
        strategies.add(new BlogStrategy());
        strategies.add(new NewsStrategy());
        //注册默认策略
        strategies.add(new DefaultStrategy());
    }

    public CrawlStrategy getStrategy(String url) {
        //按优先级降序排序
        return strategies.stream()
                .sorted((s1, s2) -> Integer.compare(s2.getPriority(), s1.getPriority()))
                .filter(s -> s.supports(url))
                .findFirst()
                .orElse(null); // 如果默认策略未匹配到，返回 null 或默认策略本身
    }

    public void register(CrawlStrategy strategy) {
        strategies.add(strategy);
    }
}