Updating the library will now to add songs with the same base file.

src/main/java/musicplayer/Player.java

@@ -154,4 +154,8 @@ class Player {
             Gst.quit();
         }
     }
+
+    public boolean isPlaying(){
+        return playBin.isPlaying();
+    }
 }

src/main/java/musicplayer/db/Gateway.java

@@ -39,6 +39,18 @@ public class Gateway {
         }
     }
 
+    /**
+     * @param metadata Metadata of song to find.
+     * @return Song found with metadata or Optional.empty()
+     */
+    public static Optional<Song> getOneSong(ExtractedMetadata metadata){
+        try (Session session = DatabaseManager.getInstance().getSession()) {
+            Song song = (Song)session.createCriteria(Song.class)
+                    .add(Restrictions.eq("songFile", metadata.songFile)).uniqueResult();
+            return (song == null) ? Optional.empty() : Optional.of(song);
+        }
+    }
+
     /**
      * List all items in the database of a certain type.
      * @param typeClass Class representing the type of items to find.
@@ -74,7 +86,7 @@ public class Gateway {
 
     /**
      * Add a new song to the database.
-     *
+     * If the song already exists it will be updated instead.
      * @param metadata New song information.
      */
     public static void addSong(ExtractedMetadata metadata) {
@@ -90,8 +102,13 @@ public class Gateway {
                 Artist artist = new Artist(metadata.artist);
                 artistObj = Optional.of(artist);
             }
+            Optional<Song> songObj = getOneSong(metadata);
+            if(!songObj.isPresent())
                 session.save(new Song(metadata.trackNumber, metadata.discNumber, metadata.title, artistObj.get(),
                         albumObj.get(), metadata.genre, metadata.songFile));
+            else
+                songObj.get().updateData(metadata.trackNumber, metadata.discNumber, metadata.title, artistObj.get(),
+                        albumObj.get(), metadata.genre, metadata.songFile);
             session.getTransaction().commit();
         }
     }

src/main/java/musicplayer/model/Song.java

@@ -41,17 +41,7 @@ public class Song implements Comparable<Song>, IDBType {
     }
 
     public Song(String trackNumber, String discNumber, String title, Artist artist, Album album, String genre, String songFile) {
-        try {
+        updateData(trackNumber, discNumber, title, artist, album, genre, songFile);
-            this.trackNumber = Integer.parseInt(trackNumber);
-        } catch (NumberFormatException e){ this.trackNumber = 0; }
-        try {
-            this.discNumber = Integer.parseInt(discNumber);
-        } catch (NumberFormatException e){ this.discNumber = 0; }
-        this.title = title;
-        this.artist = artist;
-        this.genre = genre;
-        this.album = album;
-        this.songFile = songFile;
     }
 
     @Override
@@ -139,4 +129,28 @@ public class Song implements Comparable<Song>, IDBType {
     public String getM3UFormatString(){
         return String.format("#EXTINF:0,%s - %s\n%s\n", getArtist().getName(), getTitle(), getSongFile().getAbsolutePath());
     }
+
+    /**
+     * Update the data stored in this Song object
+     * @param trackNumber Track Number
+     * @param discNumber Disc Number
+     * @param title Song Title
+     * @param artist Artist
+     * @param album Album
+     * @param genre Genre
+     * @param songFile Absolute path to song source file
+     */
+    public void updateData(String trackNumber, String discNumber, String title, Artist artist, Album album, String genre, String songFile){
+        try {
+            this.trackNumber = Integer.parseInt(trackNumber);
+        } catch (NumberFormatException e){ this.trackNumber = 0; }
+        try {
+            this.discNumber = Integer.parseInt(discNumber);
+        } catch (NumberFormatException e){ this.discNumber = 0; }
+        this.title = title;
+        this.artist = artist;
+        this.genre = genre;
+        this.album = album;
+        this.songFile = songFile;
+    }
 }