java/w11/StrategyFactory.java

package com.example.datacollect.strategy;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.util.ArrayList;
import java.util.List;

public class StrategyFactory {
    private static final Logger logger = LoggerFactory.getLogger(StrategyFactory.class);
    private final List<CrawlStrategy> strategies = new ArrayList<>();

    public StrategyFactory() {
        strategies.add(new HnuNewsStrategy());
        strategies.add(new BlogStrategy());
        strategies.add(new NewsStrategy());
        logger.info("Initialized with {} strategies", strategies.size());
    }

    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) {
            logger.debug("Found strategy {} for URL: {}", bestStrategy.getClass().getSimpleName(), url);
            return bestStrategy;
        }
        logger.debug("No specific strategy found for URL: {}, using default", url);
        return new DefaultStrategy();
    }

    public void register(CrawlStrategy strategy) {
        strategies.add(strategy);
        logger.info("Registered strategy: {}", strategy.getClass().getSimpleName());
    }
}