ThemeService.java

package com.tanpu.community.service;

import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.baomidou.mybatisplus.core.conditions.update.LambdaUpdateWrapper;
import com.tanpu.common.exception.BizException;
import com.tanpu.common.uuid.UuidGenHelper;
import com.tanpu.community.api.enums.DeleteTagEnum;
import com.tanpu.community.dao.entity.community.ThemeEntity;
import com.tanpu.community.dao.mapper.community.ThemeMapper;
import org.apache.commons.collections4.CollectionUtils;
import org.apache.commons.lang3.StringUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import javax.annotation.Resource;
import java.time.LocalDateTime;
import java.util.Collections;
import java.util.List;
import java.util.Set;
import java.util.stream.Collectors;

@Service
public class ThemeService {

    @Resource
    private ThemeMapper themeMapper;

    @Autowired
    private UuidGenHelper uuidGenHelper;

    @Transactional
    public void insertTheme(ThemeEntity themeEntity) {
        themeEntity.setThemeId(uuidGenHelper.getUuidStr());
        themeMapper.insert(themeEntity);
    }

    @Transactional
    public void update(ThemeEntity themeEntity, String themeId) {
        themeMapper.update(themeEntity, new LambdaUpdateWrapper<ThemeEntity>().eq(ThemeEntity::getThemeId, themeId));
    }

    //根据id返回主题详情（未删）
    public ThemeEntity queryByThemeId(String themeId) {
        return themeMapper.selectOne(new LambdaQueryWrapper<ThemeEntity>()
                .eq(ThemeEntity::getThemeId, themeId)
                .eq(ThemeEntity::getDeleteTag, DeleteTagEnum.NOT_DELETED.getCode()));
    }

    public List<ThemeEntity> queryThemesByUserId(String userId) {
        return themeMapper.selectList(new LambdaQueryWrapper<ThemeEntity>()
                .eq(ThemeEntity::getAuthorId, userId)
                .eq(ThemeEntity::getDeleteTag, DeleteTagEnum.NOT_DELETED.getCode())
                .orderByDesc(ThemeEntity::getId));
    }

    public List<ThemeEntity> queryThemesByUserId(String userId, String lastId, Integer pageSize) {
        LambdaQueryWrapper<ThemeEntity> queryWrapper = new LambdaQueryWrapper<ThemeEntity>()
                .eq(ThemeEntity::getAuthorId, userId)
                .eq(ThemeEntity::getDeleteTag, DeleteTagEnum.NOT_DELETED.getCode())
                .orderByDesc(ThemeEntity::getId);
        if (StringUtils.isNotEmpty(lastId)) {
            ThemeEntity lastEntity = queryByThemeId(lastId);
            if (lastEntity == null) throw new BizException("主题未找到，id：" + lastId);
            queryWrapper.lt(ThemeEntity::getUpdateTime, lastEntity.getCreateTime());
        }
        if (pageSize != null) {
            queryWrapper.last("limit " + pageSize);
        }
        return themeMapper.selectList(queryWrapper);
    }

    //根据ids返回主题详情,带分页
    public List<ThemeEntity> queryByThemeIds(List<String> themeIds, String lastId, Integer pageSize) {
        LambdaQueryWrapper<ThemeEntity> queryWrapper = new LambdaQueryWrapper<ThemeEntity>()
                .in(ThemeEntity::getThemeId, themeIds)
                .eq(ThemeEntity::getDeleteTag, DeleteTagEnum.NOT_DELETED.getCode());
        if (StringUtils.isNotEmpty(lastId)) {
            ThemeEntity lastEntity = queryByThemeId(lastId);
            if (lastEntity == null) throw new BizException("主题未找到，id：" + lastId);
            queryWrapper.lt(ThemeEntity::getUpdateTime, lastEntity.getCreateTime());
        }
        if (pageSize != null) {
            queryWrapper.last("limit " + pageSize);
        }
        return themeMapper.selectList(queryWrapper);
    }

    //根据ids返回主题详情
    public List<ThemeEntity> queryByThemeIds(List<String> themeIds) {
        LambdaQueryWrapper<ThemeEntity> queryWrapper = new LambdaQueryWrapper<ThemeEntity>()
                .in(ThemeEntity::getThemeId, themeIds)
                .eq(ThemeEntity::getDeleteTag, DeleteTagEnum.NOT_DELETED.getCode());

        return themeMapper.selectList(queryWrapper);
    }

    /**
     * 分页查询，非当前用户的主题
     * @param lastId
     * @param pageSize
     * @param userId
     * @return
     */
    public List<ThemeEntity> selectExcludeUser(String userId,String lastId, Integer pageSize) {
        LambdaQueryWrapper<ThemeEntity> queryWrapper = new LambdaQueryWrapper<>();
        if (!StringUtils.isEmpty(userId)){
            queryWrapper.ne(ThemeEntity::getAuthorId,userId);
        }

        if (StringUtils.isNotEmpty(lastId)) {
            ThemeEntity lastEntity = queryByThemeId(lastId);
            if (lastEntity == null) throw new BizException("主题未找到，id：" + lastId);
            queryWrapper.lt(ThemeEntity::getUpdateTime, lastEntity.getCreateTime());
        }

        queryWrapper.last("limit " + pageSize);
        queryWrapper.orderByDesc(ThemeEntity::getId);
        queryWrapper.orderByDesc(ThemeEntity::getCreateTime);
        queryWrapper.eq(ThemeEntity::getDeleteTag, DeleteTagEnum.NOT_DELETED.getCode());
        return themeMapper.selectList(queryWrapper);
    }


    /**
     * 根据条件查询最新主题
     *
     * @param topidId  话题Id
     * @param lastId   查询此主题Id之前的主题
     * @param pageSize 查询数量
     * @return
     */
    public List<ThemeEntity> queryByTopic(String topidId, String lastId, Integer pageSize) {
        LambdaQueryWrapper<ThemeEntity> queryWrapper = new LambdaQueryWrapper<ThemeEntity>()
                .eq(ThemeEntity::getTopicId, topidId);
        if (StringUtils.isNotEmpty(lastId)) {
            ThemeEntity lastEntity = queryByThemeId(lastId);
            if (lastEntity == null) throw new BizException("主题未找到，id：" + lastId);
            queryWrapper.lt(ThemeEntity::getUpdateTime, lastEntity.getCreateTime());
        }
        if (pageSize != null) {
            queryWrapper.last("limit " + pageSize);
        }
        queryWrapper.orderByDesc(ThemeEntity::getCreateTime);
        queryWrapper.eq(ThemeEntity::getDeleteTag, DeleteTagEnum.NOT_DELETED.getCode());
        return themeMapper.selectList(queryWrapper);
    }

    //根据话题查询所有的主题Id
    public List<String> queryThemeIdsByTopic(String topidId) {
        if (StringUtils.isEmpty(topidId)) {
            return Collections.emptyList();
        }
        LambdaQueryWrapper<ThemeEntity> queryWrapper = new LambdaQueryWrapper<ThemeEntity>()
                .eq(ThemeEntity::getTopicId, topidId);
        queryWrapper.select(ThemeEntity::getThemeId);
        return themeMapper.selectList(queryWrapper).stream().map(ThemeEntity::getThemeId).collect(Collectors.toList());
    }


    //关注的主题列表
    public List<ThemeEntity> queryByUserIds(List<String> userIds, String lastId, Integer pageSize) {
        LambdaQueryWrapper<ThemeEntity> queryWrapper = new LambdaQueryWrapper<ThemeEntity>()
                .in(ThemeEntity::getAuthorId, userIds);
        if (StringUtils.isNotEmpty(lastId)) {
            ThemeEntity lastEntity = queryByThemeId(lastId);
            if (lastEntity == null) throw new BizException("主题未找到，id：" + lastId);
            queryWrapper.lt(ThemeEntity::getUpdateTime, lastEntity.getCreateTime());
        }
        queryWrapper.last("limit " + pageSize);
        queryWrapper.orderByDesc(ThemeEntity::getCreateTime);
        queryWrapper.eq(ThemeEntity::getDeleteTag, DeleteTagEnum.NOT_DELETED.getCode());
        return themeMapper.selectList(queryWrapper);

    }

    /**
     * 根据关键字搜索
     * @param keyword
     * @param lastId
     * @param pageSize
     * @return
     */
    public List<ThemeEntity> search(String keyword, String lastId, Integer pageSize) {
        if (StringUtils.isEmpty(keyword)){
            return Collections.emptyList();
        }
        LambdaQueryWrapper<ThemeEntity> queryWrapper = new LambdaQueryWrapper<ThemeEntity>()
                .like(ThemeEntity::getTitle, keyword);
        if (StringUtils.isNotEmpty(lastId)) {
            ThemeEntity lastEntity = queryByThemeId(lastId);
            if (lastEntity == null) throw new BizException("主题未找到，id：" + lastId);
            queryWrapper.lt(ThemeEntity::getUpdateTime, lastEntity.getCreateTime());
        }
        queryWrapper.last("limit " + pageSize);
        queryWrapper.orderByDesc(ThemeEntity::getCreateTime);
        queryWrapper.eq(ThemeEntity::getDeleteTag, DeleteTagEnum.NOT_DELETED.getCode());
        return themeMapper.selectList(queryWrapper);

    }


    //查询对应话题的发表用户集合
    public Set<String> getPostUserCount(List<String> themeIds) {
        return themeMapper.selectBatchIds(themeIds).stream()
                .map(ThemeEntity::getAuthorId)
                .collect(Collectors.toSet());
    }

    public Integer getForwardCountById(String themeId) {
        return themeMapper.selectCount(new LambdaQueryWrapper<ThemeEntity>()
                .eq(ThemeEntity::getFormerThemeId, themeId)
                .eq(ThemeEntity::getDeleteTag, DeleteTagEnum.NOT_DELETED));
    }

    public Integer getForwardCountByUser(String themeId, String userId) {
        return themeMapper.selectCount(new LambdaQueryWrapper<ThemeEntity>()
                .eq(ThemeEntity::getFormerThemeId, themeId)
                .eq(ThemeEntity::getAuthorId, userId)
                .eq(ThemeEntity::getDeleteTag, DeleteTagEnum.NOT_DELETED));
    }

    @Transactional
    public void deleteById(String themeId) {
        ThemeEntity themeEntity = themeMapper.selectOne(new LambdaQueryWrapper<ThemeEntity>()
                .eq(ThemeEntity::getThemeId, themeId));
        if (themeEntity == null) {
            throw new BizException("主题未找到，id:" + themeId);
        }
        themeEntity.setDeleteTag(DeleteTagEnum.DELETED.getCode());
        themeMapper.updateById(themeEntity);
    }

    /**
     * 查询更新节点后的用户新建主题数
     * @param userIds 用户ids
     * @param lastViewTime 更新时间节点
     * @return
     */
    public Integer queryCountFromLastTime(List<String> userIds, LocalDateTime lastViewTime) {
        if (CollectionUtils.isEmpty(userIds)) {
            return 0;
        }
        LambdaQueryWrapper<ThemeEntity> queryWrapper = new LambdaQueryWrapper<ThemeEntity>()
                .in(ThemeEntity::getAuthorId, userIds)
                .eq(ThemeEntity::getDeleteTag, DeleteTagEnum.NOT_DELETED.getCode());
        if (lastViewTime != null) {
            queryWrapper.gt(ThemeEntity::getCreateTime, lastViewTime);
        }
        return themeMapper.selectCount(queryWrapper);
    }


}