campus-lost-found/InMemoryDAO.java

package com.lostfound.dao;

import com.lostfound.model.Item;
import com.lostfound.model.User;

import java.util.*;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.atomic.AtomicInteger;
import java.util.stream.Collectors;

public class InMemoryDAO {
    private static final Map<String, User> users = new ConcurrentHashMap<>();
    private static final Map<String, Item> items = new ConcurrentHashMap<>();
    private static final AtomicInteger itemIdGen = new AtomicInteger(1);

    static {
        // 预置一个管理员账号：admin / 123456
        users.put("admin", new User("admin", "管理员", "123456", "admin"));
    }

    public static void addUser(User user) {
        users.put(user.getId(), user);
    }

    public static User getUser(String id) {
        return users.get(id);
    }

    public static void addItem(Item item) {
        item.setId("I" + itemIdGen.getAndIncrement());
        items.put(item.getId(), item);
    }

    public static Item getItem(String id) {
        return items.get(id);
    }

    public static List<Item> getAllItems() {
        return new ArrayList<>(items.values());
    }

    public static List<Item> searchItems(String keyword, String category, String location) {
        return items.values().stream()
                .filter(item -> (keyword == null || keyword.isEmpty() ||
                        item.getDescription().toLowerCase().contains(keyword.toLowerCase()) ||
                        item.getCategory().toLowerCase().contains(keyword.toLowerCase())))
                .filter(item -> category == null || category.isEmpty() || item.getCategory().equals(category))
                .filter(item -> location == null || location.isEmpty() || item.getLocation().equals(location))
                .collect(Collectors.toList());
    }

    public static void markAsMatched(String itemId) {
        Item item = items.get(itemId);
        if (item != null) {
            item.setMatched(true);
            // 给发布者加积分
            User owner = users.get(item.getUserId());
            if (owner != null) {
                owner.setPoints(owner.getPoints() + 10);
            }
        }
    }
}