java/w10/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());
    }

    public CrawlStrategy getStrategy(String url) {
        CrawlStrategy bestStrategy = null;
        int highestPriority = -1;
        
        for (CrawlStrategy s : strategies) {
            if (s.supports(url) && s.getPriority() > highestPriority) {
                bestStrategy = s;
                highestPriority = s.getPriority();
            }
        }
        
        if (bestStrategy != null) {
            return bestStrategy;
        }
        return new DefaultStrategy();
    }

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