content: package com.java2nb.novel.service.impl;
  
  import com.java2nb.novel.dao.BookCommentDao;
  import com.java2nb.novel.dao.BookDao;
  import com.java2nb.novel.dao.UserDao;
  import com.java2nb.novel.domain.BookCommentDO;
  import com.java2nb.novel.domain.BookDO;
  import com.java2nb.novel.domain.UserDO;
  import com.java2nb.novel.service.BookCommentService;
  import org.springframework.beans.factory.annotation.Autowired;
  import org.springframework.stereotype.Service;
  import org.springframework.util.CollectionUtils;
  
  import java.util.List;
  import java.util.Map;
  import java.util.stream.Collectors;
  
  
  @Service
  public class BookCommentServiceImpl implements BookCommentService {
  
      @Autowired
      private BookCommentDao bookCommentDao;
      @Autowired
      private BookDao bookDao;
      @Autowired
      private UserDao userDao;
  
      @Override
      public BookCommentDO get(Long id) {
          return bookCommentDao.get(id);
      }
  
      @Override
      public List<BookCommentDO> list(Map<String, Object> map) {
          List<BookCommentDO> list = bookCommentDao.list(map);
          if (!CollectionUtils.isEmpty(list)) {
              List<Long> bookIds = list.stream().map(BookCommentDO::getBookId).collect(Collectors.toList());
              Map<Long, String> bookNameMap = bookDao.batchGet(bookIds).stream()
                  .collect(Collectors.toMap(BookDO::getId, BookDO::getBookName));
              List<Long> userIds = list.stream().map(BookCommentDO::getCreateUserId).collect(Collectors.toList());
              Map<Long, String> userNameMap = userDao.batchGet(userIds).stream()
                  .collect(Collectors.toMap(UserDO::getId, UserDO::getUsername));
              list.forEach(v -> {
                  v.setBookName(bookNameMap.get(v.getBookId()));
                  v.setUserName(userNameMap.get(v.getCreateUserId()));
              });
          }
          return list;
      }
  
      @Override
      public int count(Map<String, Object> map) {
          return bookCommentDao.count(map);
      }
  
      @Override
      public int save(BookCommentDO bookComment) {
          return bookCommentDao.save(bookComment);
      }
  
      @Override
      public int update(BookCommentDO bookComment) {
          return bookCommentDao.update(bookComment);
      }
  
      @Override
      public int remove(Long id) {
          return bookCommentDao.remove(id);
      }
  
      @Override
      public int batchRemove(Long[] ids) {
          return bookCommentDao.batchRemove(ids);
      }
  
  }
  