Program: SongList and MySong For this project, you will be creating a lists of songs, like a playlists in a music app. The song data will be obtained from an online dataset and accessed via the BRIDGES API. The dataset structure for the songs consists of the title, release_date, artist, album, and lyrics. • You are to write a class called MySong to hold information about songs. o The MySong class must implement the Comparable o You will be obtaining the song data to create MySong objects using the BRIDGES API via the connect.DataSource and bridges.data_src_dependent.Song classes. • You will store the MySong objects in a second class called SongList o The SongList class implements the custom List Download List interface and the java.util.Iterable interface. o You only need to implement the iterator method of the Iterable interface, you may leave the two default methods as they are provided. o A SongIterator class must be implemented as an inner class to the SongList o Each SongList must have a name and a linked chain of Slelement objects

package cmsc256; import bridges.connect.Bridges; import bridges.connect.DataSource; import bridges.data_src_dependent.Song; import bridges.base.SLelement; import java.util.*; // SongList Class // implements List // implements Iterable public class SongList implements List , Iterable { public static void main(String[] args) throws Exception { // Set Credentials (Put Your Own) String user_id = ""; String api_key = ""; int assignment_number = 0; // Create Bridges Object using Credentials System.out.println("[INITIATE] Authenticating"); Bridges bridges = new Bridges(assignment_number, user_id, api_key); // Create Data Source object System.out.println("[DATA] Creating DataSource Object"); DataSource ds = bridges.getDataSource(); String song_name, artist; // Get Songs from Datasource song_name = "Harder Faster Better Stronger"; artist = "Daft Punk"; System.out.println("[SONG] Getting Song: "+song_name+" by "+artist); Song s1 = ds.getSong(song_name, artist); song_name = "Enter Sandman"; artist = "Metallica"; System.out.println("[SONG] Getting Song: "+song_name+" by "+artist); Song s2 = ds.getSong(song_name, artist); song_name = "Around the World"; artist = "Daft Punk"; System.out.println("[SONG] Getting Song: "+song_name+" by "+artist); Song s3 = ds.getSong(song_name, artist); song_name = "Never Gonna Give You Up"; artist = "Rick Astley"; System.out.println("[SONG] Getting Song: "+song_name+" by "+artist); Song s4 = ds.getSong(song_name, artist); song_name = "Happy"; artist = "Pharrell Williams"; System.out.println("[SONG] Getting Song: "+song_name+" by "+artist); Song s5 = ds.getSong(song_name, artist); song_name = "Bohemian Rhapsody"; artist = "Queen"; System.out.println("[SONG] Getting Song: "+song_name+" by "+artist); Song s6 = ds.getSong(song_name, artist); song_name = "Get Lucky"; artist = "Daft Punk"; System.out.println("[SONG] Getting Song: "+song_name+" by "+artist); Song s7 = ds.getSong(song_name, artist); ArrayList all_songs = new ArrayList<>(Arrays.asList(s1,s2,s3,s4,s5,s6,s7)); System.out.println("[STATUS] Song Fetch Successful!\n"); // Create Song List Object SongList list = new SongList("Rock and Funk"); // Create MySong Objects for(int i=0; i it=list.iterator(); it.hasNext(); ) { System.out.println(it.next().getTitle()); } // Get Songs by Artist Name System.out.println(); System.out.println(list.getSongsByArtist("Daft Punk")); System.out.println(list.getSongsByArtist("Metallica")); System.out.println(list.getSongsByArtist("Rick Astley")); System.out.println(list.getSongsByArtist("Martin Garrix")); } // Class Member Variables private String name; private SLelement chain; private int size; // Accessor for song list name public String getListName() { return this.name; } /** * Creates a new song list * @param name of the song list */ public SongList(String name) { this.name = name; this.chain = null; this.size = 0; } /** * Remove all contents from the list, so it is once again empty */ public void clear() { // Set chain and size to null and 0 respectively this.chain = null; this.size = 0; } /** * Inserts element at the given position * @param it * @param position * @return true if successful * @throws IllegalArgumentException if position is number of elements in the list */ public boolean insert(MySong it, int position) { // If valid position if ((position >= 0) && (position node = new SLelement (it); // If position is first position if(position == 0) { // Change chain head to node node.setNext(this.chain); this.chain = node; } else { // Go to position where node is to be inserted SLelement temp = this.chain; for(int i = 0; i next = temp.getNext(); node.setNext(next); temp.setNext(node); } // Increase size by 1 this.size += 1; return true; } // else throw exception else { throw new IndexOutOfBoundsException("Illegal Position!"); } } /** * Appends element to the end of the list * @param it * @return true if successful */ public boolean add(MySong it) { // Create new Slelement node using given MySong object SLelement node = new SLelement (it); // If size of chain is 0, add to head of chain if (this.size==0) { this.chain = node; } else { // Go to end of the chain SLelement temp = this.chain; for(int i = 0; i number of elements in the list */ public MySong remove(int position) { MySong element = null; // If position is valid if ((position >= 0) && (position temp = this.chain; for(int i = 0; i remove = temp.getNext(); SLelement next = remove.getNext(); // Remove and return node element = remove.getValue(); temp.setNext(next); } // Decrease size by 1 this.size -= 1; return element; } // else throw exception else { throw new IndexOutOfBoundsException("Illegal Position!"); } } /** * @return the number of elements in this list */ public int size() { return this.size; } /** * @return true if this list has no elements */ public boolean isEmpty() { // Check current size (return true if 0) if(this.size==0) { return true; } else { return false; } } /** * @param target * @return true if the target element is in this list * false otherwise */ public boolean contains(MySong target) { // Create temporary node for iteration SLelement temp = this.chain; for(int i=0; i number of elements in the list */ public MySong getValue(int position) { // If position is valid if((position >= 0) && (position temp = this.chain; for(int i=0; i { // Class member index private int index; // Iterator Constructor, set index to 0 (start) public SongIterator() { this.index = 0; } @Override public boolean hasNext() { // has next while index is less than chain size return this.index iterator() { // Return iterator object (SongIterator) return new SongIterator(); } // Method to get songs by artist public String getSongsByArtist(String artist) { // Initialize empty string String out = ""; // Temporary Node for iteration SLelement temp = this.chain; // Arrays to store data (used in sorting) int idx = 0; ArrayList titles = new ArrayList (); ArrayList albums = new ArrayList (); ArrayList index = new ArrayList (); // Iterate over all the chain for(int i=0; i<this.size; i++) { // Get MySong object (value of node) MySong obj = temp.getValue(); // If object's artist name matches given artist if(artist.compareTo(obj.getArtist())==0) { // Add title, album and index to arrays titles.add(obj.getTitle()); albums.add(obj.getAlbum()); index.add(idx++); } // Move to next node temp = temp.getNext(); } // Sort index array (custom compare) index.sort(new Comparator () { @Override public int compare(Integer a, Integer b) { // Compare titles (for lexographic order) return titles.get(a).compareTo(titles.get(b)); } } ); // Append sorted data into the output "out" string for(int i=0; i<index.size(); i++) { out += String.format("Title: %s Album: %s\n",titles.get(index.get(i)),albums.get(index.get(i))); } // If out is empty if(out=="") { // No song present of artist return String.format("There are no songs by %s in this playlist.",artist); } // Return output string return out; } }

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Program: SongList and MySong For this project, you will be creating a lists of songs, like a playlists in a music app. The song data will be obtained from an online dataset and accessed via the BRIDGES API. The dataset structure for the songs consists of the title, release_date, artist, album, and lyrics. • You