Merge pull request #23 from Said-Belhadj/developHEADmaster

Merging develop to master.

14 files changed, 0 insertions, 1182 deletions

diff --git a/src/musichub/business/Album.java b/src/musichub/business/Album.java
deleted file mode 100644
index 01fd179..0000000
--- a/src/musichub/business/Album.java
+++ /dev/null
@@ -1,145 +0,0 @@
-package musichub.business;
-
-import org.w3c.dom.Document;
-import org.w3c.dom.Element;
-import org.w3c.dom.Node;
-import org.w3c.dom.NodeList;
-
-import java.text.ParseException;
-import java.text.SimpleDateFormat;
-import java.util.*;
-
-
-public class Album {
-    private final String title;
-    private final int lengthInSeconds;
-    private final UUID uuid;
-    private String artist;
-    private Date date;
-    private ArrayList<UUID> songsUIDs;
-
-    public Album(String title, String artist, int lengthInSeconds, String id, String date, ArrayList<UUID> songsUIDs) {
-        this.title = title;
-        this.artist = artist;
-        this.lengthInSeconds = lengthInSeconds;
-        this.uuid = UUID.fromString(id);
-        try {
-            SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
-            this.date = sdf.parse(date);
-        } catch (ParseException ex) {
-            ex.printStackTrace();
-        }
-        this.songsUIDs = songsUIDs;
-    }
-
-    public Album(String title, String artist, int lengthInSeconds, String date) {
-        this.title = title;
-        this.artist = artist;
-        this.lengthInSeconds = lengthInSeconds;
-        this.uuid = UUID.randomUUID();
-        try {
-            SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
-            this.date = sdf.parse(date);
-        } catch (ParseException ex) {
-            ex.printStackTrace();
-        }
-        this.songsUIDs = new ArrayList<>();
-    }
-
-    public Album(Element xmlElement) throws Exception {
-        {
-            this.title = xmlElement.getElementsByTagName("title").item(0).getTextContent();
-            this.lengthInSeconds = Integer.parseInt(xmlElement.getElementsByTagName("lengthInSeconds").item(0).getTextContent());
-            String uuid = null;
-            try {
-                uuid = xmlElement.getElementsByTagName("UUID").item(0).getTextContent();
-            } catch (Exception ex) {
-                System.out.println("Empty album UUID, will create a new one");
-            }
-            if ((uuid == null) || (uuid.isEmpty()))
-                this.uuid = UUID.randomUUID();
-            else this.uuid = UUID.fromString(uuid);
-
-            SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
-            this.date = sdf.parse(xmlElement.getElementsByTagName("date").item(0).getTextContent());
-            //parse list of songs:
-            Node songsElement = xmlElement.getElementsByTagName("songs").item(0);
-            NodeList songUUIDNodes = songsElement.getChildNodes();
-            if (songUUIDNodes == null) return;
-
-            this.songsUIDs = new ArrayList<>();
-
-            for (int i = 0; i < songUUIDNodes.getLength(); i++) {
-                if (songUUIDNodes.item(i).getNodeType() == Node.ELEMENT_NODE) {
-                    Element songElement = (Element) songUUIDNodes.item(i);
-                    if (songElement.getNodeName().equals("UUID")) {
-                        try {
-                            this.addSong(UUID.fromString(songElement.getTextContent()));
-                        } catch (Exception ex) {
-                            ex.printStackTrace();
-                        }
-                    }
-                }
-            }
-        }
-    }
-
-
-    public void addSong(UUID song) {
-        songsUIDs.add(song);
-    }
-
-
-    public List<UUID> getSongs() {
-        return songsUIDs;
-    }
-
-    public ArrayList<UUID> getSongsRandomly() {
-        ArrayList<UUID> shuffledSongs = songsUIDs;
-        Collections.shuffle(shuffledSongs);
-        return shuffledSongs;
-    }
-
-    public String getTitle() {
-        return title;
-    }
-
-    public Date getDate() {
-        return date;
-    }
-
-    public void createXMLElement(Document document, Element parentElement) {
-        Element albumElement = document.createElement("album");
-        parentElement.appendChild(albumElement);
-
-        Element nameElement = document.createElement("title");
-        nameElement.appendChild(document.createTextNode(title));
-        albumElement.appendChild(nameElement);
-
-        Element artistElement = document.createElement("artist");
-        artistElement.appendChild(document.createTextNode(artist));
-        albumElement.appendChild(artistElement);
-
-        Element lengthElement = document.createElement("lengthInSeconds");
-        lengthElement.appendChild(document.createTextNode(Integer.valueOf(lengthInSeconds).toString()));
-        albumElement.appendChild(lengthElement);
-
-        Element UUIDElement = document.createElement("UUID");
-        UUIDElement.appendChild(document.createTextNode(uuid.toString()));
-        albumElement.appendChild(UUIDElement);
-
-        Element dateElement = document.createElement("date");
-        SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
-        dateElement.appendChild(document.createTextNode(sdf.format(date)));
-        albumElement.appendChild(dateElement);
-
-        Element songsElement = document.createElement("songs");
-        for (UUID currentUUID : this.songsUIDs) {
-            Element songUUIDElement = document.createElement("UUID");
-            songUUIDElement.appendChild(document.createTextNode(currentUUID.toString()));
-            songsElement.appendChild(songUUIDElement);
-        }
-        albumElement.appendChild(songsElement);
-
-    }
-}
\ No newline at end of file
diff --git a/src/musichub/business/AudioBook.java b/src/musichub/business/AudioBook.java
deleted file mode 100644
index 80392d6..0000000
--- a/src/musichub/business/AudioBook.java
+++ /dev/null
@@ -1,78 +0,0 @@
-package musichub.business;
-
-import org.w3c.dom.Document;
-import org.w3c.dom.Element;
-
-public class AudioBook extends AudioElement {
-    private Language language;
-    private Category category;
-
-    public AudioBook(String title, String artist, int lengthInSeconds, String uid, String content, String language, String category) {
-        super(title, artist, lengthInSeconds, uid, content);
-        this.setLanguage(language);
-        this.setCategory(category);
-    }
-
-    public AudioBook(String title, String artist, int lengthInSeconds, String content, String language, String category) {
-        super(title, artist, lengthInSeconds, content);
-        this.setLanguage(language);
-        this.setCategory(category);
-    }
-
-    public AudioBook(Element xmlElement) {
-        super(xmlElement);
-        this.setLanguage(xmlElement.getElementsByTagName("language").item(0).getTextContent());
-        this.setCategory(xmlElement.getElementsByTagName("category").item(0).getTextContent());
-    }
-
-    public Language getLanguage() {
-        return this.language;
-    }
-
-    public void setLanguage(String language) {
-        switch (language.toLowerCase()) {
-            default -> this.language = Language.ENGLISH;
-            case "french" -> this.language = Language.FRENCH;
-            case "german" -> this.language = Language.GERMAN;
-            case "spanish" -> this.language = Language.SPANISH;
-            case "italian" -> this.language = Language.ITALIAN;
-        }
-    }
-
-    public Category getCategory() {
-        return this.category;
-    }
-
-    public void setCategory(String category) {
-        switch (category.toLowerCase()) {
-            default -> this.category = Category.YOUTH;
-            case "novel" -> this.category = Category.NOVEL;
-            case "theater" -> this.category = Category.THEATER;
-            case "documentary" -> this.category = Category.DOCUMENTARY;
-            case "speech" -> this.category = Category.SPEECH;
-        }
-    }
-
-
-    public String toString() {
-        return super.toString() + ", Language = " + getLanguage() + ", Category = " + getCategory() + "\n";
-    }
-
-
-    public void createXMLElement(Document document, Element parentElement) {
-        // audiobook element
-        Element audioBook = document.createElement("audiobook");
-
-        super.createXMLElement(document, audioBook);
-
-        Element languageElement = document.createElement("language");
-        languageElement.appendChild(document.createTextNode(language.getLanguage()));
-        audioBook.appendChild(languageElement);
-
-        Element categoryElement = document.createElement("category");
-        categoryElement.appendChild(document.createTextNode(category.getCategory()));
-        audioBook.appendChild(categoryElement);
-
-        parentElement.appendChild(audioBook);
-    }
-}
\ No newline at end of file
diff --git a/src/musichub/business/AudioElement.java b/src/musichub/business/AudioElement.java
deleted file mode 100644
index e0a686b..0000000
--- a/src/musichub/business/AudioElement.java
+++ /dev/null
@@ -1,88 +0,0 @@
-package musichub.business;
-
-import org.w3c.dom.Document;
-import org.w3c.dom.Element;
-
-import java.util.UUID;
-
-public abstract class AudioElement {
-    protected String title;
-    protected String artist;
-    protected int lengthInSeconds;
-    protected UUID uuid;
-    protected String content;
-
-    public AudioElement(String title, String artist, int lengthInSeconds, String id, String content) {
-        this.title = title;
-        this.artist = artist;
-        this.lengthInSeconds = lengthInSeconds;
-        this.uuid = UUID.fromString(id);
-        this.content = content;
-    }
-
-    public AudioElement(String title, String artist, int lengthInSeconds, String content) {
-        this.title = title;
-        this.artist = artist;
-        this.lengthInSeconds = lengthInSeconds;
-        this.content = content;
-        this.uuid = UUID.randomUUID();
-    }
-
-    public AudioElement(Element xmlElement) {
-        {
-            title = xmlElement.getElementsByTagName("title").item(0).getTextContent();
-            artist = xmlElement.getElementsByTagName("artist").item(0).getTextContent();
-            lengthInSeconds = Integer.parseInt(xmlElement.getElementsByTagName("length").item(0).getTextContent());
-            content = xmlElement.getElementsByTagName("content").item(0).getTextContent();
-            String uuid = null;
-            try {
-                uuid = xmlElement.getElementsByTagName("UUID").item(0).getTextContent();
-            } catch (Exception ex) {
-                System.out.println("Empty element UUID, will create a new one");
-            }
-            if ((uuid == null) || (uuid.isEmpty()))
-                this.uuid = UUID.randomUUID();
-            else this.uuid = UUID.fromString(uuid);
-        }
-    }
-
-    public UUID getUUID() {
-        return this.uuid;
-    }
-
-    public String getArtist() {
-        return this.artist;
-    }
-
-    public String getTitle() {
-        return this.title;
-    }
-
-    public String toString() {
-        return "Title = " + this.title + ", Artist = " + this.artist + ", Length = " + this.lengthInSeconds + ", Content = " + this.content;
-    }
-
-    public void createXMLElement(Document document, Element parentElement) {
-        Element nameElement = document.createElement("title");
-        nameElement.appendChild(document.createTextNode(title));
-        parentElement.appendChild(nameElement);
-
-        Element artistElement = document.createElement("artist");
-        artistElement.appendChild(document.createTextNode(artist));
-        parentElement.appendChild(artistElement);
-
-        Element lengthElement = document.createElement("length");
-        lengthElement.appendChild(document.createTextNode(Integer.valueOf(lengthInSeconds).toString()));
-        parentElement.appendChild(lengthElement);
-
-        Element UUIDElement = document.createElement("UUID");
-        UUIDElement.appendChild(document.createTextNode(uuid.toString()));
-        parentElement.appendChild(UUIDElement);
-
-        Element contentElement = document.createElement("content");
-        contentElement.appendChild(document.createTextNode(content));
-        parentElement.appendChild(contentElement);
-
-    }
-
-}
\ No newline at end of file
diff --git a/src/musichub/business/Category.java b/src/musichub/business/Category.java
deleted file mode 100644
index f676e51..0000000
--- a/src/musichub/business/Category.java
+++ /dev/null
@@ -1,14 +0,0 @@
-package musichub.business;
-
-public enum Category {
-    YOUTH("youth"), NOVEL("novel"), THEATER("theater"), DOCUMENTARY("documentary"), SPEECH("speech");
-    private final String category;
-
-    Category(String category) {
-        this.category = category;
-    }
-
-    public String getCategory() {
-        return category;
-    }
-}
\ No newline at end of file
diff --git a/src/musichub/business/Genre.java b/src/musichub/business/Genre.java
deleted file mode 100644
index 18deca6..0000000
--- a/src/musichub/business/Genre.java
+++ /dev/null
@@ -1,14 +0,0 @@
-package musichub.business;
-
-public enum Genre {
-    JAZZ("jazz"), CLASSIC("classic"), HIPHOP("hiphop"), ROCK("rock"), POP("pop"), RAP("rap");
-    private final String genre;
-
-    Genre(String genre) {
-        this.genre = genre;
-    }
-
-    public String getGenre() {
-        return genre;
-    }
-}
\ No newline at end of file
diff --git a/src/musichub/business/Language.java b/src/musichub/business/Language.java
deleted file mode 100644
index 679e586..0000000
--- a/src/musichub/business/Language.java
+++ /dev/null
@@ -1,14 +0,0 @@
-package musichub.business;
-
-public enum Language {
-    FRENCH("french"), ENGLISH("english"), ITALIAN("italian"), SPANISH("spanish"), GERMAN("german");
-    private final String language;
-
-    Language(String language) {
-        this.language = language;
-    }
-
-    public String getLanguage() {
-        return language;
-    }
-}
\ No newline at end of file
diff --git a/src/musichub/business/MusicHub.java b/src/musichub/business/MusicHub.java
deleted file mode 100644
index 38e2214..0000000
--- a/src/musichub/business/MusicHub.java
+++ /dev/null
@@ -1,329 +0,0 @@
-package musichub.business;
-
-import musichub.util.XMLHandler;
-import org.w3c.dom.Document;
-import org.w3c.dom.Element;
-import org.w3c.dom.Node;
-import org.w3c.dom.NodeList;
-
-import java.util.*;
-
-class SortByDate implements Comparator<Album> {
-    public int compare(Album a1, Album a2) {
-        return a1.getDate().compareTo(a2.getDate());
-    }
-}
-
-class SortByGenre implements Comparator<Song> {
-    public int compare(Song s1, Song s2) {
-        return s1.getGenre().compareTo(s2.getGenre());
-    }
-}
-
-class SortByAuthor implements Comparator<AudioElement> {
-    public int compare(AudioElement e1, AudioElement e2) {
-        return e1.getArtist().compareTo(e2.getArtist());
-    }
-}
-
-public class MusicHub {
-    public static final String DIR = System.getProperty("user.dir");
-    public static final String ALBUMS_FILE_PATH = DIR + "/files/albums.xml";
-    public static final String PLAYLISTS_FILE_PATH = DIR + "/files/playlists.xml";
-    public static final String ELEMENTS_FILE_PATH = DIR + "/files/elements.xml";
-    private final List<Album> albums;
-    private final List<PlayList> playlists;
-    private final List<AudioElement> elements;
-    private final XMLHandler xmlHandler = new XMLHandler();
-
-    public MusicHub() {
-        albums = new LinkedList<>();
-        playlists = new LinkedList<>();
-        elements = new LinkedList<>();
-        this.loadElements();
-        this.loadAlbums();
-        this.loadPlaylists();
-    }
-
-    public void addElement(AudioElement element) {
-        elements.add(element);
-    }
-
-    public void addAlbum(Album album) {
-        albums.add(album);
-    }
-
-    public void addPlaylist(PlayList playlist) {
-        playlists.add(playlist);
-    }
-
-    public void deletePlayList(String playListTitle) throws NoPlayListFoundException {
-
-        PlayList thePlayList = null;
-        boolean result = false;
-        for (PlayList pl : playlists) {
-            if (pl.getTitle().equalsIgnoreCase(playListTitle)) {
-                thePlayList = pl;
-                break;
-            }
-        }
-
-        if (thePlayList != null)
-            result = playlists.remove(thePlayList);
-        if (!result) throw new NoPlayListFoundException("Playlist " + playListTitle + " not found!");
-    }
-
-    public Iterator<Album> albums() {
-        return albums.listIterator();
-    }
-
-    public Iterator<PlayList> playlists() {
-        return playlists.listIterator();
-    }
-
-    public Iterator<AudioElement> elements() {
-        return elements.listIterator();
-    }
-
-    public String getAlbumsTitlesSortedByDate() {
-        StringBuilder titleList = new StringBuilder();
-        albums.sort(new SortByDate());
-        for (Album al : albums)
-            titleList.append(al.getTitle()).append("\n");
-        return titleList.toString();
-    }
-
-    public String getAudiobooksTitlesSortedByAuthor() {
-        StringBuilder titleList = new StringBuilder();
-        List<AudioElement> audioBookList = new ArrayList<>();
-        for (AudioElement ae : elements)
-            if (ae instanceof AudioBook)
-                audioBookList.add(ae);
-        audioBookList.sort(new SortByAuthor());
-        for (AudioElement ab : audioBookList)
-            titleList.append(ab.getArtist()).append("\n");
-        return titleList.toString();
-    }
-
-    public List<AudioElement> getAlbumSongs(String albumTitle) throws NoAlbumFoundException {
-        Album theAlbum = null;
-        ArrayList<AudioElement> songsInAlbum = new ArrayList<>();
-        for (Album al : albums) {
-            if (al.getTitle().equalsIgnoreCase(albumTitle)) {
-                theAlbum = al;
-                break;
-            }
-        }
-        if (theAlbum == null) throw new NoAlbumFoundException("No album with this title in the MusicHub!");
-
-        List<UUID> songIDs = theAlbum.getSongs();
-        for (UUID id : songIDs)
-            for (AudioElement el : elements) {
-                if (el instanceof Song) {
-                    if (el.getUUID().equals(id)) songsInAlbum.add(el);
-                }
-            }
-        return songsInAlbum;
-
-    }
-
-    public List<Song> getAlbumSongsSortedByGenre(String albumTitle) throws NoAlbumFoundException {
-        Album theAlbum = null;
-        ArrayList<Song> songsInAlbum = new ArrayList<>();
-        for (Album al : albums) {
-            if (al.getTitle().equalsIgnoreCase(albumTitle)) {
-                theAlbum = al;
-                break;
-            }
-        }
-        if (theAlbum == null) throw new NoAlbumFoundException("No album with this title in the MusicHub!");
-
-        List<UUID> songIDs = theAlbum.getSongs();
-        for (UUID id : songIDs)
-            for (AudioElement el : elements) {
-                if (el instanceof Song) {
-                    if (el.getUUID().equals(id)) songsInAlbum.add((Song) el);
-                }
-            }
-        songsInAlbum.sort(new SortByGenre());
-        return songsInAlbum;
-
-    }
-
-    public void addElementToAlbum(String elementTitle, String albumTitle) throws NoAlbumFoundException, NoElementFoundException {
-        Album theAlbum = null;
-        int i;
-        boolean found = false;
-        for (i = 0; i < albums.size(); i++) {
-            if (albums.get(i).getTitle().equalsIgnoreCase(albumTitle)) {
-                theAlbum = albums.get(i);
-                found = true;
-                break;
-            }
-        }
-
-        if (found) {
-            AudioElement theElement = null;
-            for (AudioElement ae : elements) {
-                if (ae.getTitle().equalsIgnoreCase(elementTitle)) {
-                    theElement = ae;
-                    break;
-                }
-            }
-            if (theElement != null) {
-                theAlbum.addSong(theElement.getUUID());
-                //replace the album in the list
-                albums.set(i, theAlbum);
-            } else throw new NoElementFoundException("Element " + elementTitle + " not found!");
-        } else throw new NoAlbumFoundException("Album " + albumTitle + " not found!");
-
-    }
-
-    public void addElementToPlayList(String elementTitle, String playListTitle) throws NoPlayListFoundException, NoElementFoundException {
-        PlayList thePlaylist = null;
-        int i;
-        boolean found = false;
-
-        for (i = 0; i < playlists.size(); i++) {
-            if (playlists.get(i).getTitle().equalsIgnoreCase(playListTitle)) {
-                thePlaylist = playlists.get(i);
-                found = true;
-                break;
-            }
-        }
-
-        if (found) {
-            AudioElement theElement = null;
-            for (AudioElement ae : elements) {
-                if (ae.getTitle().equalsIgnoreCase(elementTitle)) {
-                    theElement = ae;
-                    break;
-                }
-            }
-            if (theElement != null) {
-                thePlaylist.addElement(theElement.getUUID());
-                //replace the album in the list
-                playlists.set(i, thePlaylist);
-            } else throw new NoElementFoundException("Element " + elementTitle + " not found!");
-
-        } else throw new NoPlayListFoundException("Playlist " + playListTitle + " not found!");
-
-    }
-
-    private void loadAlbums() {
-        NodeList albumNodes = xmlHandler.parseXMLFile(ALBUMS_FILE_PATH);
-        if (albumNodes == null) return;
-
-        for (int i = 0; i < albumNodes.getLength(); i++) {
-            if (albumNodes.item(i).getNodeType() == Node.ELEMENT_NODE) {
-                Element albumElement = (Element) albumNodes.item(i);
-                if (albumElement.getNodeName().equals("album")) {
-                    try {
-                        this.addAlbum(new Album(albumElement));
-                    } catch (Exception ex) {
-                        System.out.println("Something is wrong with the XML album element");
-                    }
-                }
-            }
-        }
-    }
-
-    private void loadPlaylists() {
-        NodeList playlistNodes = xmlHandler.parseXMLFile(PLAYLISTS_FILE_PATH);
-        if (playlistNodes == null) return;
-
-        for (int i = 0; i < playlistNodes.getLength(); i++) {
-            if (playlistNodes.item(i).getNodeType() == Node.ELEMENT_NODE) {
-                Element playlistElement = (Element) playlistNodes.item(i);
-                if (playlistElement.getNodeName().equals("playlist")) {
-                    try {
-                        this.addPlaylist(new PlayList(playlistElement));
-                    } catch (Exception ex) {
-                        System.out.println("Something is wrong with the XML playlist element");
-                    }
-                }
-            }
-        }
-    }
-
-    private void loadElements() {
-        NodeList audioelementsNodes = xmlHandler.parseXMLFile(ELEMENTS_FILE_PATH);
-        if (audioelementsNodes == null) return;
-
-        for (int i = 0; i < audioelementsNodes.getLength(); i++) {
-            if (audioelementsNodes.item(i).getNodeType() == Node.ELEMENT_NODE) {
-                Element audioElement = (Element) audioelementsNodes.item(i);
-                if (audioElement.getNodeName().equals("song")) {
-                    try {
-                        AudioElement newSong = new Song(audioElement);
-                        this.addElement(newSong);
-                    } catch (Exception ex) {
-                        System.out.println("Something is wrong with the XML song element");
-                    }
-                }
-                if (audioElement.getNodeName().equals("audiobook")) {
-                    try {
-                        AudioElement newAudioBook = new AudioBook(audioElement);
-                        this.addElement(newAudioBook);
-                    } catch (Exception ex) {
-                        System.out.println("Something is wrong with the XML audiobook element");
-                    }
-                }
-            }
-        }
-    }
-
-
-    public void saveAlbums() {
-        Document document = xmlHandler.createXMLDocument();
-        if (document == null) return;
-
-        // root element
-        Element root = document.createElement("albums");
-        document.appendChild(root);
-
-        //save all albums
-        for (Iterator<Album> albumsIter = this.albums(); albumsIter.hasNext(); ) {
-            Album currentAlbum = albumsIter.next();
-            currentAlbum.createXMLElement(document, root);
-        }
-        xmlHandler.createXMLFile(document, ALBUMS_FILE_PATH);
-    }
-
-    public void savePlayLists() {
-        Document document = xmlHandler.createXMLDocument();
-        if (document == null) return;
-
-        // root element
-        Element root = document.createElement("playlists");
-        document.appendChild(root);
-
-        //save all playlists
-        for (Iterator<PlayList> playlistsIter = this.playlists(); playlistsIter.hasNext(); ) {
-            PlayList currentPlayList = playlistsIter.next();
-            currentPlayList.createXMLElement(document, root);
-        }
-        xmlHandler.createXMLFile(document, PLAYLISTS_FILE_PATH);
-    }
-
-    public void saveElements() {
-        Document document = xmlHandler.createXMLDocument();
-        if (document == null) return;
-
-        // root element
-        Element root = document.createElement("elements");
-        document.appendChild(root);
-
-        //save all AudioElements
-        for (AudioElement currentElement : elements) {
-
-            if (currentElement instanceof Song) {
-                currentElement.createXMLElement(document, root);
-            }
-            if (currentElement instanceof AudioBook) {
-                currentElement.createXMLElement(document, root);
-            }
-        }
-        xmlHandler.createXMLFile(document, ELEMENTS_FILE_PATH);
-    }
-}
\ No newline at end of file
diff --git a/src/musichub/business/NoAlbumFoundException.java b/src/musichub/business/NoAlbumFoundException.java
deleted file mode 100644
index 04cbfcd..0000000
--- a/src/musichub/business/NoAlbumFoundException.java
+++ /dev/null
@@ -1,8 +0,0 @@
-package musichub.business;
-
-public class NoAlbumFoundException extends Exception {
-
-    public NoAlbumFoundException(String msg) {
-        super(msg);
-    }
-}
\ No newline at end of file
diff --git a/src/musichub/business/NoElementFoundException.java b/src/musichub/business/NoElementFoundException.java
deleted file mode 100644
index a9b0d76..0000000
--- a/src/musichub/business/NoElementFoundException.java
+++ /dev/null
@@ -1,8 +0,0 @@
-package musichub.business;
-
-public class NoElementFoundException extends Exception {
-
-    public NoElementFoundException(String msg) {
-        super(msg);
-    }
-}
\ No newline at end of file
diff --git a/src/musichub/business/NoPlayListFoundException.java b/src/musichub/business/NoPlayListFoundException.java
deleted file mode 100644
index c5eb413..0000000
--- a/src/musichub/business/NoPlayListFoundException.java
+++ /dev/null
@@ -1,8 +0,0 @@
-package musichub.business;
-
-public class NoPlayListFoundException extends Exception {
-
-    public NoPlayListFoundException(String msg) {
-        super(msg);
-    }
-}
\ No newline at end of file
diff --git a/src/musichub/business/PlayList.java b/src/musichub/business/PlayList.java
deleted file mode 100644
index 4180a62..0000000
--- a/src/musichub/business/PlayList.java
+++ /dev/null
@@ -1,100 +0,0 @@
-package musichub.business;
-
-import org.w3c.dom.Document;
-import org.w3c.dom.Element;
-import org.w3c.dom.Node;
-import org.w3c.dom.NodeList;
-
-import java.util.ArrayList;
-import java.util.UUID;
-
-public class PlayList {
-    private final String title;
-    private final UUID uuid;
-    private ArrayList<UUID> elementUUIDs;
-
-    public PlayList(String title, String id, ArrayList<UUID> elementUUIDs) {
-        this.title = title;
-        this.uuid = UUID.fromString(id);
-        this.elementUUIDs = elementUUIDs;
-    }
-
-    public PlayList(String title) {
-        this.title = title;
-        this.uuid = UUID.randomUUID();
-        this.elementUUIDs = new ArrayList<>();
-    }
-
-    public PlayList(Element xmlElement) {
-        {
-            this.title = xmlElement.getElementsByTagName("title").item(0).getTextContent();
-
-            String uuid = null;
-            try {
-                uuid = xmlElement.getElementsByTagName("UUID").item(0).getTextContent();
-            } catch (Exception ex) {
-                System.out.println("Empty playlist UUID, will create a new one");
-            }
-            if ((uuid == null) || (uuid.isEmpty()))
-                this.uuid = UUID.randomUUID();
-            else this.uuid = UUID.fromString(uuid);
-
-            //parse list of elements:
-            Node elementsElement = xmlElement.getElementsByTagName("elements").item(0);
-            NodeList elementUUIDNodes = elementsElement.getChildNodes();
-            if (elementUUIDNodes == null) return;
-
-            this.elementUUIDs = new ArrayList<>();
-
-
-            for (int i = 0; i < elementUUIDNodes.getLength(); i++) {
-                if (elementUUIDNodes.item(i).getNodeType() == Node.ELEMENT_NODE) {
-                    Element elementElement = (Element) elementUUIDNodes.item(i);
-                    if (elementElement.getNodeName().equals("UUID")) {
-                        try {
-                            this.addElement(UUID.fromString(elementElement.getTextContent()));
-                        } catch (Exception ex) {
-                            ex.printStackTrace();
-                        }
-                    }
-                }
-            }
-        }
-    }
-
-    public void addElement(UUID element) {
-        elementUUIDs.add(element);
-    }
-
-    public ArrayList<UUID> getElements() {
-        return elementUUIDs;
-    }
-
-    public String getTitle() {
-        return title;
-    }
-
-    public void createXMLElement(Document document, Element parentElement) {
-        Element playlistElement = document.createElement("playlist");
-        parentElement.appendChild(playlistElement);
-
-        Element nameElement = document.createElement("title");
-        nameElement.appendChild(document.createTextNode(title));
-        playlistElement.appendChild(nameElement);
-
-        Element UUIDElement = document.createElement("UUID");
-        UUIDElement.appendChild(document.createTextNode(uuid.toString()));
-        playlistElement.appendChild(UUIDElement);
-
-
-        Element elementsElement = document.createElement("elements");
-        for (UUID currentUUID : this.elementUUIDs) {
-
-            Element elementUUIDElement = document.createElement("UUID");
-            elementUUIDElement.appendChild(document.createTextNode(currentUUID.toString()));
-            elementsElement.appendChild(elementUUIDElement);
-        }
-        playlistElement.appendChild(elementsElement);
-    }
-
-}
\ No newline at end of file
diff --git a/src/musichub/business/Song.java b/src/musichub/business/Song.java
deleted file mode 100644
index 3e9011b..0000000
--- a/src/musichub/business/Song.java
+++ /dev/null
@@ -1,56 +0,0 @@
-package musichub.business;
-
-import org.w3c.dom.Document;
-import org.w3c.dom.Element;
-
-
-public class Song extends AudioElement {
-    private Genre genre;
-
-    public Song(String title, String artist, int length, String uid, String content, String genre) {
-        super(title, artist, length, uid, content);
-        this.setGenre(genre);
-    }
-
-    public Song(String title, String artist, int length, String content, String genre) {
-        super(title, artist, length, content);
-        this.setGenre(genre);
-    }
-
-    public Song(Element xmlElement) {
-        super(xmlElement);
-        this.setGenre(xmlElement.getElementsByTagName("genre").item(0).getTextContent());
-    }
-
-    public String getGenre() {
-        return genre.getGenre();
-    }
-
-    public void setGenre(String genre) {
-        switch (genre.toLowerCase()) {
-            default -> this.genre = Genre.JAZZ;
-            case "classic" -> this.genre = Genre.CLASSIC;
-            case "hiphop" -> this.genre = Genre.HIPHOP;
-            case "rock" -> this.genre = Genre.ROCK;
-            case "pop" -> this.genre = Genre.POP;
-            case "rap" -> this.genre = Genre.RAP;
-        }
-    }
-
-    public String toString() {
-        return super.toString() + ", Genre = " + getGenre() + "\n";
-    }
-
-    public void createXMLElement(Document document, Element parentElement) {
-        // song element
-        Element song = document.createElement("song");
-
-        super.createXMLElement(document, song);
-
-        Element genreElement = document.createElement("genre");
-        genreElement.appendChild(document.createTextNode(genre.getGenre()));
-        song.appendChild(genreElement);
-
-        parentElement.appendChild(song);
-    }
-}
\ No newline at end of file
diff --git a/src/musichub/main/Main.java b/src/musichub/main/Main.java
deleted file mode 100644
index f917b01..0000000
--- a/src/musichub/main/Main.java
+++ /dev/null
@@ -1,246 +0,0 @@
-package musichub.main;
-
-import musichub.business.*;
-
-import java.util.Iterator;
-import java.util.Scanner;
-
-public class Main {
-    public static void main(String[] args) {
-
-        MusicHub theHub = new MusicHub();
-
-        System.out.println("Type h for available commands");
-
-
-        Scanner scan = new Scanner(System.in);
-        String choice = scan.nextLine();
-
-        String albumTitle;
-
-        if (choice.length() == 0) System.exit(0);
-
-        while (choice.charAt(0) != 'q') {
-            switch (choice.charAt(0)) {
-                case 'h':
-                    printAvailableCommands();
-                    choice = scan.nextLine();
-                    break;
-                case 't':
-                    //album titles, ordered by date
-                    System.out.println(theHub.getAlbumsTitlesSortedByDate());
-                    printAvailableCommands();
-                    choice = scan.nextLine();
-                    break;
-                case 'g':
-                    //songs of an album, sorted by genre
-                    System.out.println("Songs of an album sorted by genre will be displayed; enter the album name, available albums are:");
-                    System.out.println(theHub.getAlbumsTitlesSortedByDate());
-
-                    albumTitle = scan.nextLine();
-                    try {
-                        System.out.println(theHub.getAlbumSongsSortedByGenre(albumTitle));
-                    } catch (NoAlbumFoundException ex) {
-                        System.out.println("No album found with the requested title " + ex.getMessage());
-                    }
-                    printAvailableCommands();
-                    choice = scan.nextLine();
-                    break;
-                case 'd':
-                    //songs of an album
-                    System.out.println("Songs of an album will be displayed; enter the album name, available albums are:");
-                    System.out.println(theHub.getAlbumsTitlesSortedByDate());
-
-                    albumTitle = scan.nextLine();
-                    try {
-                        System.out.println(theHub.getAlbumSongs(albumTitle));
-                    } catch (NoAlbumFoundException ex) {
-                        System.out.println("No album found with the requested title " + ex.getMessage());
-                    }
-                    printAvailableCommands();
-                    choice = scan.nextLine();
-                    break;
-                case 'u':
-                    //audiobooks ordered by author
-                    System.out.println(theHub.getAudiobooksTitlesSortedByAuthor());
-                    printAvailableCommands();
-                    choice = scan.nextLine();
-                    break;
-                case 'c':
-                    // add a new song
-                    System.out.println("Enter a new song: ");
-                    System.out.println("Song title: ");
-                    String title = scan.nextLine();
-                    System.out.println("Song genre (jazz, classic, hiphop, rock, pop, rap):");
-                    String genre = scan.nextLine();
-                    System.out.println("Song artist: ");
-                    String artist = scan.nextLine();
-                    System.out.println("Song length in seconds: ");
-                    int length = Integer.parseInt(scan.nextLine());
-                    System.out.println("Song content: ");
-                    String content = scan.nextLine();
-                    Song s = new Song(title, artist, length, content, genre);
-                    theHub.addElement(s);
-                    System.out.println("New element list: ");
-                    Iterator<AudioElement> it = theHub.elements();
-                    while (it.hasNext()) System.out.println(it.next().getTitle());
-                    System.out.println("Song created!");
-                    printAvailableCommands();
-                    choice = scan.nextLine();
-                    break;
-                case 'a':
-                    // add a new album
-                    System.out.println("Enter a new album: ");
-                    System.out.println("Album title: ");
-                    String aTitle = scan.nextLine();
-                    System.out.println("Album artist: ");
-                    String aArtist = scan.nextLine();
-                    System.out.println("Album length in seconds: ");
-                    int aLength = Integer.parseInt(scan.nextLine());
-                    System.out.println("Album date as YYYY-DD-MM: ");
-                    String aDate = scan.nextLine();
-                    Album a = new Album(aTitle, aArtist, aLength, aDate);
-                    theHub.addAlbum(a);
-                    System.out.println("New list of albums: ");
-                    Iterator<Album> ita = theHub.albums();
-                    while (ita.hasNext()) System.out.println(ita.next().getTitle());
-                    System.out.println("Album created!");
-                    printAvailableCommands();
-                    choice = scan.nextLine();
-                    break;
-                case '+':
-                    //add a song to an album:
-                    System.out.println("Add an existing song to an existing album");
-                    System.out.println("Type the name of the song you wish to add. Available songs: ");
-                    Iterator<AudioElement> itae = theHub.elements();
-                    while (itae.hasNext()) {
-                        AudioElement ae = itae.next();
-                        if (ae instanceof Song) System.out.println(ae.getTitle());
-                    }
-                    String songTitle = scan.nextLine();
-
-                    System.out.println("Type the name of the album you wish to enrich. Available albums: ");
-                    Iterator<Album> ait = theHub.albums();
-                    while (ait.hasNext()) {
-                        Album al = ait.next();
-                        System.out.println(al.getTitle());
-                    }
-                    String titleAlbum = scan.nextLine();
-                    try {
-                        theHub.addElementToAlbum(songTitle, titleAlbum);
-                    } catch (NoAlbumFoundException | NoElementFoundException ex) {
-                        System.out.println(ex.getMessage());
-                    }
-                    System.out.println("Song added to the album!");
-                    printAvailableCommands();
-                    choice = scan.nextLine();
-                    break;
-                case 'l':
-                    // add a new audiobook
-                    System.out.println("Enter a new audiobook: ");
-                    System.out.println("AudioBook title: ");
-                    String bTitle = scan.nextLine();
-                    System.out.println("AudioBook category (youth, novel, theater, documentary, speech)");
-                    String bCategory = scan.nextLine();
-                    System.out.println("AudioBook artist: ");
-                    String bArtist = scan.nextLine();
-                    System.out.println("AudioBook length in seconds: ");
-                    int bLength = Integer.parseInt(scan.nextLine());
-                    System.out.println("AudioBook content: ");
-                    String bContent = scan.nextLine();
-                    System.out.println("AudioBook language (french, english, italian, spanish, german)");
-                    String bLanguage = scan.nextLine();
-                    AudioBook b = new AudioBook(bTitle, bArtist, bLength, bContent, bLanguage, bCategory);
-                    theHub.addElement(b);
-                    System.out.println("Audiobook created! New element list: ");
-                    Iterator<AudioElement> itl = theHub.elements();
-                    while (itl.hasNext()) System.out.println(itl.next().getTitle());
-                    printAvailableCommands();
-                    choice = scan.nextLine();
-                    break;
-                case 'p':
-                    //create a new playlist from existing elements
-                    System.out.println("Add an existing song or audiobook to a new playlist");
-                    System.out.println("Existing playlists:");
-                    Iterator<PlayList> itpl = theHub.playlists();
-                    while (itpl.hasNext()) {
-                        PlayList pl = itpl.next();
-                        System.out.println(pl.getTitle());
-                    }
-                    System.out.println("Type the name of the playlist you wish to create:");
-                    String playListTitle = scan.nextLine();
-                    PlayList pl = new PlayList(playListTitle);
-                    theHub.addPlaylist(pl);
-                    System.out.println("Available elements: ");
-
-                    Iterator<AudioElement> itael = theHub.elements();
-                    while (itael.hasNext()) {
-                        AudioElement ae = itael.next();
-                        System.out.println(ae.getTitle());
-                    }
-                    while (choice.charAt(0) != 'n') {
-                        System.out.println("Type the name of the audio element you wish to add or 'n' to exit:");
-                        String elementTitle = scan.nextLine();
-                        try {
-                            theHub.addElementToPlayList(elementTitle, playListTitle);
-                        } catch (NoPlayListFoundException | NoElementFoundException ex) {
-                            System.out.println(ex.getMessage());
-                        }
-
-                        System.out.println("Type y to add a new one, n to end");
-                        choice = scan.nextLine();
-                    }
-                    System.out.println("Playlist created!");
-                    printAvailableCommands();
-                    choice = scan.nextLine();
-                    break;
-                case '-':
-                    //delete a playlist
-                    System.out.println("Delete an existing playlist. Available playlists:");
-                    Iterator<PlayList> itp = theHub.playlists();
-                    while (itp.hasNext()) {
-                        PlayList p = itp.next();
-                        System.out.println(p.getTitle());
-                    }
-                    String plTitle = scan.nextLine();
-                    try {
-                        theHub.deletePlayList(plTitle);
-                    } catch (NoPlayListFoundException ex) {
-                        System.out.println(ex.getMessage());
-                    }
-                    System.out.println("Playlist deleted!");
-                    printAvailableCommands();
-                    choice = scan.nextLine();
-                    break;
-                case 's':
-                    //save elements, albums, playlists
-                    theHub.saveElements();
-                    theHub.saveAlbums();
-                    theHub.savePlayLists();
-                    System.out.println("Elements, albums and playlists saved!");
-                    printAvailableCommands();
-                    choice = scan.nextLine();
-                    break;
-                default:
-
-                    break;
-            }
-        }
-        scan.close();
-    }
-
-    private static void printAvailableCommands() {
-        System.out.println("t: display the album titles, ordered by date");
-        System.out.println("g: display songs of an album, ordered by genre");
-        System.out.println("d: display songs of an album");
-        System.out.println("u: display audiobooks ordered by author");
-        System.out.println("c: add a new song");
-        System.out.println("a: add a new album");
-        System.out.println("+: add a song to an album");
-        System.out.println("l: add a new audiobook");
-        System.out.println("p: create a new playlist from existing songs and audio books");
-        System.out.println("-: delete an existing playlist");
-        System.out.println("s: save elements, albums, playlists");
-        System.out.println("q: quit program");
-    }
-}
\ No newline at end of file
diff --git a/src/musichub/util/XMLHandler.java b/src/musichub/util/XMLHandler.java
deleted file mode 100644
index 4b61842..0000000
--- a/src/musichub/util/XMLHandler.java
+++ /dev/null
@@ -1,74 +0,0 @@
-package musichub.util;
-
-import org.w3c.dom.Document;
-import org.w3c.dom.Element;
-import org.w3c.dom.NodeList;
-import org.xml.sax.SAXException;
-
-import javax.xml.parsers.DocumentBuilder;
-import javax.xml.parsers.DocumentBuilderFactory;
-import javax.xml.parsers.ParserConfigurationException;
-import javax.xml.transform.Transformer;
-import javax.xml.transform.TransformerException;
-import javax.xml.transform.TransformerFactory;
-import javax.xml.transform.dom.DOMSource;
-import javax.xml.transform.stream.StreamResult;
-import java.io.File;
-import java.io.IOException;
-
-
-public class XMLHandler {
-    TransformerFactory transformerFactory;
-    Transformer transformer;
-    DocumentBuilderFactory documentFactory;
-    DocumentBuilder documentBuilder;
-
-    public XMLHandler() {
-        try {
-            transformerFactory = TransformerFactory.newInstance();
-            transformer = transformerFactory.newTransformer();
-            documentFactory = DocumentBuilderFactory.newInstance();
-            documentBuilder = documentFactory.newDocumentBuilder();
-        } catch (TransformerException | ParserConfigurationException tfe) {
-            tfe.printStackTrace();
-        }
-    }
-
-    public void createXMLFile(Document document, String filePath) {
-        try {
-            // create the xml file
-            //transform the DOM Object to an XML File
-            DOMSource domSource = new DOMSource(document);
-            StreamResult streamResult = new StreamResult(new File(filePath));
-
-            // If you use
-            // StreamResult result = new StreamResult(System.out);
-            // the output will be pushed to the standard output ...
-            // You can use that for debugging
-
-            transformer.transform(domSource, streamResult);
-
-        } catch (TransformerException tfe) {
-            tfe.printStackTrace();
-        }
-    }
-
-    public Document createXMLDocument() {
-        return documentBuilder.newDocument();
-    }
-
-    public NodeList parseXMLFile(String filePath) {
-        NodeList elementNodes = null;
-        try {
-            Document document = documentBuilder.parse(new File(filePath));
-            Element root = document.getDocumentElement();
-
-            elementNodes = root.getChildNodes();
-        } catch (SAXException | IOException e) {
-            e.printStackTrace();
-        }
-        return elementNodes;
-    }
-
-
-}
\ No newline at end of file