java/w9/CrawlerController.java

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

/**
 * Controller: 解析输入、分发命令、维护历史记录
 * 严格遵守 MVC：不持有任何 System.out，所有输出走 view
 */
public class CrawlerController {
    private final ConsoleView        view;
    private final List<Article>      articles;
    private final Map<String, Command> commands = new HashMap<>();
    private final List<String>       history  = new ArrayList<>();  // 作业2

    public CrawlerController(ConsoleView view, List<Article> articles) {
        this.view     = view;
        this.articles = articles;
        registerCommands();
    }

    private void registerCommands() {
        CrawlCommand crawl = new CrawlCommand(view);
        register(crawl.getName(), crawl);
        register(crawl.getAlias(), crawl);    // 选做：别名 "c"

        register(new ListCommand(view));
        register(new HelpCommand(view));
        register(new ExitCommand(view));
        register(new HistoryCommand(view, history));   // 作业2，注入共享 history
    }

    private void register(Command cmd) {
        commands.put(cmd.getName(), cmd);
    }

    private void register(String key, Command cmd) {
        commands.put(key, cmd);
    }

    /** 处理一行用户输入 */
    public void handle(String input) {
        if (input == null || input.isBlank()) return;

        history.add(input);                           // 作业2：记录每条命令

        String[] parts = input.trim().split("\\s+");
        String   name  = parts[0].toLowerCase();
        Command  cmd   = commands.get(name);

        if (cmd == null) {
            view.printError("未知命令：" + name + "。输入 help 查看可用命令。");
        } else {
            cmd.execute(parts, articles);
        }
    }
}