java/W11/repository/ArticleRepository.java

package com.example.datacollect.repository;

import com.example.datacollect.model.Article;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;

public class ArticleRepository {
    private static final Logger logger = LoggerFactory.getLogger(ArticleRepository.class);
    private final List<Article> articles = new ArrayList<>();

    public void add(Article article) {
        if (article == null) {
            logger.error("Attempted to add null article");
            throw new IllegalArgumentException("Article cannot be null");
        }
        if (article.getTitle() == null || article.getTitle().trim().isEmpty()) {
            logger.warn("Attempted to add article with empty title");
            throw new IllegalArgumentException("Article title cannot be null or empty");
        }
        if (article.getUrl() == null || article.getUrl().trim().isEmpty()) {
            logger.warn("Attempted to add article with empty URL");
            throw new IllegalArgumentException("Article URL cannot be null or empty");
        }
        articles.add(article);
        logger.debug("Added article: {}", article.getTitle());
    }

    public void addAll(List<Article> articlesToAdd) {
        if (articlesToAdd == null) {
            logger.error("Attempted to add null list of articles");
            throw new IllegalArgumentException("Article list cannot be null");
        }
        for (Article article : articlesToAdd) {
            add(article);
        }
        logger.info("Added {} articles to repository", articlesToAdd.size());
    }

    public List<Article> getAll() {
        logger.debug("Retrieving all articles, count: {}", articles.size());
        return Collections.unmodifiableList(articles);
    }

    public int size() {
        return articles.size();
    }

    public void clear() {
        logger.info("Clearing repository, removed {} articles", articles.size());
        articles.clear();
    }

    public boolean isEmpty() {
        return articles.isEmpty();
    }

    public Article get(int index) {
        if (index < 0 || index >= articles.size()) {
            logger.error("Attempted to access article at invalid index: {}", index);
            throw new IndexOutOfBoundsException("Index: " + index + ", Size: " + articles.size());
        }
        return articles.get(index);
    }
}