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.

Completion Instructions

• 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.

API 1

Path: /songs

Method: GET

Description:

Returns a list of all songs in the playlist.

Response

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

API 2

Path: /songs

Method: POST

Description:

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

Request

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

Response

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

API 3

Path: /songs/{songId}

Method: GET

Description:

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

Response

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

}

API 4

Path: /songs/{songId}

Method: PUT

Description:

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.

Request

{
    "singer": "Atif Aslam"
}

Response

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

API 5

Path: /songs/{songId}

Method: DELETE

Description:

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.