care/ruoyi-system/src/main/java/com/ruoyi/system/service/impl/SysNoticeServiceImpl.java

package com.ruoyi.system.service.impl;

import java.util.ArrayList;
import java.util.Date;
import java.util.List;
import java.util.stream.Collectors;

import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.ruoyi.common.core.domain.entity.SysUser;
import com.ruoyi.common.utils.SecurityUtils;
import com.ruoyi.system.domain.SysNoticeUser;
import com.ruoyi.system.mapper.SysNoticeUserMapper;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import com.ruoyi.system.domain.SysNotice;
import com.ruoyi.system.mapper.SysNoticeMapper;
import com.ruoyi.system.service.ISysNoticeService;
import org.springframework.transaction.annotation.Transactional;

/**
 * 公告 服务层实现
 *
 * @author ruoyi
 */
@Service
public class SysNoticeServiceImpl  extends ServiceImpl<SysNoticeMapper, SysNotice> implements ISysNoticeService
{
    @Autowired
    private SysNoticeMapper noticeMapper;
    @Autowired
    private SysNoticeUserMapper noticeUserMapper;

    /**
     * 查询公告信息
     *
     * @param noticeId 公告ID
     * @return 公告信息
     */
    @Override
    public SysNotice selectNoticeById(Long noticeId)
    {
        return noticeMapper.selectById(noticeId);
    }

    /**
     * 查询公告列表
     *
     * @param notice 公告信息
     * @return 公告集合
     */
    @Override
    public List<SysNotice> selectNoticeList(SysNotice notice)
    {
        return noticeMapper.selectNoticeList(notice);
    }

    /**
     * 新增公告
     *
     * @param notice 公告信息
     * @return 结果
     */
    @Override
    public int insertNotice(SysNotice notice)
    {
        return noticeMapper.insertNotice(notice);
    }


    /**
     * 修改公告
     *
     * @param notice 公告信息
     * @return 结果
     */
    @Override
    public int updateNotice(SysNotice notice)
    {
        return noticeMapper.updateById(notice);

    }

    /**
     * 删除公告对象
     *
     * @param noticeId 公告ID
     * @return 结果
     */
    @Override
    public int deleteNoticeById(Long noticeId)
    {
        return noticeMapper.deleteNoticeById(noticeId);
    }

    /**
     * 批量删除公告信息
     *
     * @param noticeIds 需要删除的公告ID
     * @return 结果
     */
    @Override
    public int deleteNoticeByIds(Long[] noticeIds)
    {
        return noticeMapper.deleteNoticeByIds(noticeIds);
    }

    @Override
    @Transactional
    public int addNoticeUser(Long noticeId, List<SysUser> users) {
        Long userId = SecurityUtils.getUserId();
        Date date = new Date();
        List<Long> userIds = users.stream().map(SysUser::getUserId).collect(Collectors.toList());
        //查询已经添加的学生
        List<SysNoticeUser> userList = noticeUserMapper.selectNoticeUsers(noticeId, userIds);
        List<Long> hasExistIds = userList.stream().map(SysNoticeUser::getUserId).collect(Collectors.toList());
        List<SysNoticeUser> noticeUsers = new ArrayList<>();
        for (SysUser user : users) {
            if (!hasExistIds.contains(user.getUserId())) {
                SysNoticeUser st = new SysNoticeUser();
                st.setUserId(user.getUserId());
                st.setNoticeId(noticeId);
                st.setCreateBy(userId.toString());
                st.setCreateTime(date);
                st.setStatus("0");
                noticeUsers.add(st);
            }
        }
        if (!noticeUsers.isEmpty()) {
            noticeUserMapper.insertBatch(noticeUsers);
        }

        SysNoticeUser noticeUser = new SysNoticeUser();
        noticeUser.setNoticeId(noticeId);
        return noticeUserMapper.selectNoticeUserList(noticeUser).size();
    }
}