From 0b73de2ee6b36fed3005480b2e18ce5b716f5662 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?=E5=BC=A0=E9=9B=AA=E5=B0=94?= Date: Mon, 22 Dec 2025 04:13:26 +0800 Subject: [PATCH] =?UTF-8?q?=E6=9B=B4=E6=96=B0=20src/main/java/com/vibevaul?= =?UTF-8?q?t/service/PlaylistServiceImpl.java?= MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit --- .../service/PlaylistServiceImpl.java | 149 +++++++++++++++--- 1 file changed, 123 insertions(+), 26 deletions(-) diff --git a/src/main/java/com/vibevault/service/PlaylistServiceImpl.java b/src/main/java/com/vibevault/service/PlaylistServiceImpl.java index f69b712..567e6e2 100644 --- a/src/main/java/com/vibevault/service/PlaylistServiceImpl.java +++ b/src/main/java/com/vibevault/service/PlaylistServiceImpl.java @@ -14,6 +14,7 @@ import org.springframework.stereotype.Service; import org.springframework.transaction.annotation.Transactional; import java.util.List; +import java.util.stream.Collectors; /** * 歌单服务实现 @@ -37,60 +38,134 @@ public class PlaylistServiceImpl implements PlaylistService { @Override public List getAllPlaylists() { - // TODO: 实现获取所有歌单 - throw new UnsupportedOperationException("待实现"); + // 获取所有歌单并转换为DTO + return playlistRepository.findAll().stream() + .map(this::toDTO) + .collect(Collectors.toList()); } @Override public PlaylistDTO getPlaylistById(Long id) { - // TODO: 实现根据 ID 获取歌单，不存在时抛出 ResourceNotFoundException - throw new UnsupportedOperationException("待实现"); + // 根据ID查询歌单，不存在则抛异常 + Playlist playlist = playlistRepository.findById(id) + .orElseThrow(() -> new ResourceNotFoundException("歌单不存在，ID: " + id)); + return toDTO(playlist); } @Override @Transactional public PlaylistDTO createPlaylist(String name, String ownerUsername) { - // TODO: 实现创建歌单 - throw new UnsupportedOperationException("待实现"); + // 1. 查询歌单所有者 + User owner = userRepository.findByUsername(ownerUsername) + .orElseThrow(() -> new ResourceNotFoundException("用户不存在，用户名: " + ownerUsername)); + + // 2. 创建歌单实体 + Playlist playlist = new Playlist(); + playlist.setName(name); + playlist.setOwner(owner); + + // 3. 保存歌单并返回DTO + Playlist savedPlaylist = playlistRepository.save(playlist); + return toDTO(savedPlaylist); } @Override @Transactional - public PlaylistDTO addSongToPlaylist(Long playlistId, SongCreateDTO song, String username) { - // TODO: 实现添加歌曲到歌单 - // [Challenge] 需要检查用户是否有权限操作此歌单 - throw new UnsupportedOperationException("待实现"); + public PlaylistDTO addSongToPlaylist(Long playlistId, SongCreateDTO songDTO, String username) { + // 1. 查询歌单 + Playlist playlist = playlistRepository.findById(playlistId) + .orElseThrow(() -> new ResourceNotFoundException("歌单不存在，ID: " + playlistId)); + + // 2. 检查用户权限 + checkPermission(playlist, username); + + // 3. 创建歌曲实体 + Song song = new Song(); + song.setTitle(songDTO.getTitle()); + song.setArtist(songDTO.getArtist()); + song.setDurationInSeconds(songDTO.getDurationInSeconds()); + song.setPlaylist(playlist); + + // 4. 维护双向关系并保存 + playlist.getSongs().add(song); + Playlist updatedPlaylist = playlistRepository.save(playlist); + + return toDTO(updatedPlaylist); } @Override @Transactional public void removeSongFromPlaylist(Long playlistId, Long songId, String username) { - // TODO: 实现从歌单移除歌曲 - // [Challenge] 需要检查用户是否有权限操作此歌单 - throw new UnsupportedOperationException("待实现"); + // 1. 查询歌单 + Playlist playlist = playlistRepository.findById(playlistId) + .orElseThrow(() -> new ResourceNotFoundException("歌单不存在，ID: " + playlistId)); + + // 2. 检查用户权限 + checkPermission(playlist, username); + + // 3. 查询歌曲并移除 + Song song = playlist.getSongs().stream() + .filter(s -> s.getId().equals(songId)) + .findFirst() + .orElseThrow(() -> new ResourceNotFoundException("歌曲不存在，ID: " + songId)); + + playlist.getSongs().remove(song); + playlistRepository.save(playlist); } @Override @Transactional public void deletePlaylist(Long playlistId, String username) { - // TODO: 实现删除歌单 - // [Challenge] 需要检查用户是否有权限操作此歌单 - throw new UnsupportedOperationException("待实现"); + // 1. 查询歌单 + Playlist playlist = playlistRepository.findById(playlistId) + .orElseThrow(() -> new ResourceNotFoundException("歌单不存在，ID: " + playlistId)); + + // 2. 检查用户权限 + checkPermission(playlist, username); + + // 3. 删除歌单 + playlistRepository.delete(playlist); } // ========== Advanced 方法 ========== @Override public List searchPlaylists(String keyword) { - // TODO [Advanced]: 实现按关键字搜索歌单 - throw new UnsupportedOperationException("待实现"); + // 按名称模糊搜索歌单 + return playlistRepository.findByNameContainingIgnoreCase(keyword).stream() + .map(this::toDTO) + .collect(Collectors.toList()); } @Override @Transactional public PlaylistDTO copyPlaylist(Long playlistId, String newName, String username) { - // TODO [Advanced]: 实现复制歌单 - throw new UnsupportedOperationException("待实现"); + // 1. 查询原歌单 + Playlist original = playlistRepository.findById(playlistId) + .orElseThrow(() -> new ResourceNotFoundException("原歌单不存在，ID: " + playlistId)); + + // 2. 查询目标用户（新所有者） + User newOwner = userRepository.findByUsername(username) + .orElseThrow(() -> new ResourceNotFoundException("用户不存在，用户名: " + username)); + + // 3. 创建新歌单 + Playlist copy = new Playlist(); + copy.setName(newName); + copy.setOwner(newOwner); + + // 4. 复制歌曲 + original.getSongs().forEach(song -> { + Song newSong = new Song(); + newSong.setTitle(song.getTitle()); + newSong.setArtist(song.getArtist()); + newSong.setDurationInSeconds(song.getDurationInSeconds()); + newSong.setPlaylist(copy); + copy.getSongs().add(newSong); + }); + + // 5. 保存并返回DTO + Playlist savedCopy = playlistRepository.save(copy); + return toDTO(savedCopy); } // ========== 辅助方法 ========== @@ -99,16 +174,28 @@ public class PlaylistServiceImpl implements PlaylistService { * 将 Playlist 实体转换为 DTO */ private PlaylistDTO toDTO(Playlist playlist) { - // TODO: 实现实体到 DTO 的转换 - throw new UnsupportedOperationException("待实现"); + List songDTOs = playlist.getSongs().stream() + .map(this::toSongDTO) + .collect(Collectors.toList()); + + return new PlaylistDTO( + playlist.getId(), + playlist.getName(), + playlist.getOwner().getUsername(), + songDTOs + ); } /** * 将 Song 实体转换为 DTO */ private SongDTO toSongDTO(Song song) { - // TODO: 实现实体到 DTO 的转换 - throw new UnsupportedOperationException("待实现"); + return new SongDTO( + song.getId(), + song.getTitle(), + song.getArtist(), + song.getDurationInSeconds() + ); } /** @@ -116,7 +203,17 @@ public class PlaylistServiceImpl implements PlaylistService { * 规则：歌单所有者或管理员可以操作 */ private void checkPermission(Playlist playlist, String username) { - // TODO [Challenge]: 实现权限检查 - // 如果无权限，抛出 UnauthorizedException + // 查询当前操作的用户 + User operator = userRepository.findByUsername(username) + .orElseThrow(() -> new ResourceNotFoundException("操作用户不存在，用户名: " + username)); + + // 权限规则：所有者 或 管理员（假设角色为"ROLE_ADMIN"） + boolean isOwner = playlist.getOwner().getUsername().equals(username); + boolean isAdmin = "ROLE_ADMIN".equals(operator.getRole()); + + if (!isOwner && !isAdmin) { + throw new UnauthorizedException("无权限操作此歌单"); + } } } + \ No newline at end of file