Given four files SongController.java, SongRepository.java, SongService.java, and Song.java. The SongService class has a variable named playlist, which is a HashMap that holds Integers as keys and Song objects as values. Initially, it contains data of 5 songs.

• Song.java: The Song class should contain the following attributes.

  Attribute	Type
  songId	int
  songName	String
  lyricist	String
  singer	String
  musicDirector	String

• SongRepository.java: Create an interface containing required methods.

• SongService.java: Update the service class with logic for managing song data.

• SongController: Create the controller class to handle HTTP requests.

Implement the following APIs.

Returns a list of all songs in the playlist.

[ { "songId": 1, "songName": "Butta Bomma", "lyricist": "Ramajogayya Sastry", "singer": "Armaan Malik", "musicDirector": "Thaman S" }, ... ] 

Creates a new song in the playlist. songId is auto-incremented.

{ "songName": "Bala", "lyricist": "Siddharth-Garima", "singer": "Sachin-Jigar", "musicDirector": "Sachin-Jigar" } 

{ "songId": 6, "songName": "Bala", "lyricist": "Siddharth-Garima", "singer": "Sachin-Jigar", "musicDirector": "Sachin-Jigar" } 

Returns a song based on a songId. If the given songId is not found in the playlist, raise ResponseStatusException with HttpStatus.NOT_FOUND.

{ "songId": 3, "songName": "Tum Hi Ho", "lyricist": "Mithoon", "singer": "Arijit Singh", "musicDirector": "Mithoon" } 

Updates the details of a song in the playlist based on the songId. If the given songId is not found in the playlist, raise ResponseStatusException with HttpStatus.NOT_FOUND.

{ "singer": "Atif Aslam" } 

{ "songId": 3, "songName": "Tum Hi Ho", "lyricist": "Mithoon", "singer": "Atif Aslam", "musicDirector": "Mithoon" } 

Deletes a song from the playlist based on the songId. If the given songId is not found in the playlist, raise ResponseStatusException with HttpStatus.NOT_FOUND.

Do not modify the code in the SongApplication.java.