Mapper Examples

backend/kaiser/src/main/java/com/example/springKaiser/business/playlist/PlaylistService.java

@@ -27,39 +27,39 @@ public class PlaylistService {
     VideoRepository videoRepository;
 
 
-    public void addPlaylist(PlaylistName playlistName){
+    public void addPlaylist(PlaylistName playlistName) {
 
         playlistNameRepository.save(playlistName);
     }
 
-    public void addVideo(PlaylistVideo playlistVideo){
+    public void addVideo(PlaylistVideo playlistVideo) {
 
         playlistVideoRepository.save(playlistVideo);
     }
 
-    public List<PlaylistName> listPlaylist(){
+    public List<PlaylistName> listPlaylist() {
         List<PlaylistName> listPlaylistName = playlistNameRepository.findAll();
         return listPlaylistName;
     }
 
-    public List<PlaylistName> sortPlaylist(){
+    public List<PlaylistName> sortPlaylist() {
         List<PlaylistName> listByPlaylistName = playlistNameRepository.findAll();
         List<PlaylistName> sortList = listByPlaylistName.stream().sorted(Comparator.comparing(PlaylistName::getPlaylistname)).collect(Collectors.toList());
         return sortList;
     }
 
-    public List<PlaylistVideo> listPlaylistVideo(){
+    public List<PlaylistVideo> listPlaylistVideo() {
         List<PlaylistVideo> listPlaylistVideo = playlistVideoRepository.findAll();
         return listPlaylistVideo;
     }
 
-        public String countPlaylist(String playlistName){
-        List<PlaylistVideo> listByPlaylistVideo =playlistVideoRepository.findByPlaylistName(playlistName);
+    public String countPlaylist(String playlistName) {
+        List<PlaylistVideo> listByPlaylistVideo = playlistVideoRepository.findByPlaylistName(playlistName);
 
         return "Number of videos inside playlist: " + listByPlaylistVideo.size();
     }
 
-    public String addVideoToPlaylist(String playlist, String videoName){
+    public String addVideoToPlaylist(String playlist, String videoName) {
 
         PlaylistName playlistName = playlistNameRepository.findOneByName(playlist);
         Video video = videoRepository.findOneByName(videoName);
@@ -71,7 +71,7 @@ public String addVideoToPlaylist(String playlist, String videoName){
         return "Success";
     }
 
-    public ListPlaylistByVideoNameAndChannelNameDto listByVideoNameAndChannelName (String videoName, String channelName){
+    public ListPlaylistByVideoNameAndChannelNameDto listByVideoNameAndChannelName(String videoName, String channelName) {
         List<PlaylistVideo> playlistVideos = playlistVideoRepository.findByVideoNameAndChannelName(videoName, channelName);
         ListPlaylistByVideoNameAndChannelNameDto listPlaylistByVideoNameAndChannelNameDtos = new ListPlaylistByVideoNameAndChannelNameDto();
         listPlaylistByVideoNameAndChannelNameDtos.setPlaylistName(playlistVideos.get(0).getPlaylistName().getPlaylistname());
@@ -80,21 +80,13 @@ public ListPlaylistByVideoNameAndChannelNameDto listByVideoNameAndChannelName (S
         return listPlaylistByVideoNameAndChannelNameDtos;
     }
 
-    public List<ListPlaylistByChannelDto> listPlaylistNameByChannelName(String channelName){
+    public List<ListPlaylistByChannelDto> listPlaylistNameByChannelName(String channelName) {
         List<PlaylistVideo> playlistVideos = playlistVideoRepository.findPlaylistNameByChannelName(channelName);
+        ListPlaylistByChannelDto listPlaylistByChannelDto = new ListPlaylistByChannelDto();
         List<ListPlaylistByChannelDto> listPlaylistByChannelDtos = new ArrayList<>();
-//        for (int i =0; i<playlistVideos.size(); i++)
-//        {
-//            ListPlaylistByChannelDto listPlaylistByChannelDto = new ListPlaylistByChannelDto();
-//            listPlaylistByChannelDto.setPlaylistName(playlistVideos.get(i).getPlaylistName().getPlaylistname());
-//            listPlaylistByChannelDto.setChannelName(playlistVideos.get(i).getVideo().getChannel().getChannelName());
-//            listPlaylistByChannelDtos.add(listPlaylistByChannelDto);
-//        }
-        for (PlaylistVideo playlistVideoIterator: playlistVideos)
-        {
-            ListPlaylistByChannelDto listPlaylistByChannelDto = new ListPlaylistByChannelDto();
-            listPlaylistByChannelDto.setPlaylistName(playlistVideoIterator.getPlaylistName().getPlaylistname());
-            listPlaylistByChannelDto.setChannelName(playlistVideoIterator.getVideo().getChannel().getChannelName());
+        for (int i = 0; i < playlistVideos.size(); i++) {
+            listPlaylistByChannelDto.setPlaylistName(playlistVideos.get(i).getPlaylistName().getPlaylistname());
+            listPlaylistByChannelDto.setChannelName(playlistVideos.get(i).getVideo().getChannel().getChannelName());
             listPlaylistByChannelDtos.add(listPlaylistByChannelDto);
         }
         return listPlaylistByChannelDtos;

backend/kaiser/src/main/java/com/example/springKaiser/business/student/StudentMapper.java

@@ -0,0 +1,34 @@
+package com.example.springKaiser.business.student;
+
+import com.example.springKaiser.entities.Students;
+import org.springframework.stereotype.Service;
+
+import java.util.ArrayList;
+import java.util.List;
+
+@Service
+public class StudentMapper {
+
+    StudentDto toDto(Students students) {
+        StudentDto studentDto = new StudentDto();
+        studentDto.setName(students.getName());
+        studentDto.setEmail(students.getEmail());
+        studentDto.setGradeId(students.getGrade().getId());
+        studentDto.setHomeGradeTeacherId(students.getHomeGradeTeacher().getId());
+        return studentDto;
+    }
+
+    List<StudentDto> toList(List<Students> studentsList) {
+        List<StudentDto> studentDtoList = new ArrayList<>();
+        //Same as below
+//        for (Students studentElement : studentsList){
+//            studentDtoList.add(toDto(studentElement));
+//        }
+
+        for (int i = 0; i < studentsList.size(); i++) {
+            StudentDto studentDto = toDto(studentsList.get(i));
+            studentDtoList.add(studentDto);
+        }
+        return studentDtoList;
+    }
+}

backend/kaiser/src/main/java/com/example/springKaiser/business/student/StudentsService.java

@@ -31,6 +31,9 @@ public class StudentsService {
     @Autowired
     TeacherRepository teacherRepository;
 
+    @Autowired
+    StudentMapper studentMapper;
+
     final int gradeOne = 1;
 
     public String saveStudentOnGrade(){
@@ -87,6 +90,11 @@ public List<Students> listStudents() {
         return listStudents;
     }
 
+    public List<StudentDto> getListOfStudents() {
+        List<StudentDto> studentsDtos = studentMapper.toList(studentsRepository.findAll());
+        return studentsDtos;
+    }
+
     public List<Students> listStudentsByGrade(int studentGrade) {
         List<Students> studentsOnThatSpecificGrade = new ArrayList<>();
         for(Students student : listStudents()) {

backend/kaiser/src/main/java/com/example/springKaiser/controller/StudentsController.java

@@ -61,5 +61,9 @@ public String addStudents(@RequestBody StudentDto studentDto) {
         return studentsService.saveStudent(studentDto);
     }
 
+    @GetMapping("/getStudentDtoList")
+    public List<StudentDto> getStudentsDtos() {
+        return studentsService.getListOfStudents();
+    }
 
 }