Moved callback interfaces.

src/main/java/musicplayer/LibraryUtils.java

@@ -1,5 +1,6 @@
 package musicplayer;
 
+import musicplayer.callbacks.LibraryCallbackInterface;
 import musicplayer.db.Gateway;
 import musicplayer.model.ExtractedMetadata;
 import org.jaudiotagger.audio.AudioFileIO;
@@ -12,25 +13,51 @@ import org.jaudiotagger.tag.TagException;
 import java.io.IOException;
 import java.nio.file.Files;
 import java.nio.file.Path;
+import java.util.List;
 import java.util.Optional;
 
 public final class LibraryUtils {
 
     static final String musicFileExtensionRegex = ".*\\.(mp3|mp4|flac)";
 
+    public static void processSongsWithCallback(List<Path> rootDirectory, LibraryCallbackInterface callbackInterface){
+        Thread thread = new Thread(() -> {
+            try {
+                processSongs(rootDirectory);
+                callbackInterface.libraryUpdated(true);
+            } catch (IOException e) {
+                callbackInterface.libraryUpdated(false);
+            }
+        });
+        thread.start();
+    }
+
+    public static void processSongsWithCallback(Path rootDirectory, LibraryCallbackInterface callbackInterface){
+        Thread thread = new Thread(() -> {
+            try {
+                processSongs(rootDirectory);
+                callbackInterface.libraryUpdated(true);
+            } catch (IOException e) {
+                callbackInterface.libraryUpdated(false);
+            }
+        });
+        thread.start();
+    }
+
+    public static void processSongs(List<Path> rootDirectories) throws IOException {
+        for(Path rootDirectory: rootDirectories)
+            processSongs(rootDirectory);
+    }
+
     /**
      * Walk through all files and directories recursively and index any music files with a correct extension
      *
      * @param rootDirectory Directory from which to start searching
      */
-    public static void processSongs(Path rootDirectory) {
-        try {
-            Files.walk(rootDirectory)
-                    .filter(f -> f.toString().matches(musicFileExtensionRegex))
-                    .map(LibraryUtils::autoParse).filter(Optional::isPresent).map(Optional::get).forEach(Gateway::addSong);
-        } catch (IOException e) {
-            e.printStackTrace();
-        }
+    public static void processSongs(Path rootDirectory) throws IOException {
+        Files.walk(rootDirectory)
+                .filter(f -> f.toString().matches(musicFileExtensionRegex))
+                .map(LibraryUtils::autoParse).filter(Optional::isPresent).map(Optional::get).forEach(Gateway::addSong);
     }
 
     /**

src/main/java/musicplayer/Player.java

@@ -1,5 +1,6 @@
 package musicplayer;
 
+import musicplayer.callbacks.PlayerCallbackInterface;
 import musicplayer.model.Song;
 import org.gstreamer.ElementFactory;
 import org.gstreamer.Gst;

src/main/java/musicplayer/PlayerGUI.java

@@ -1,5 +1,7 @@
 package musicplayer;
 
+import musicplayer.callbacks.LibraryCallbackInterface;
+import musicplayer.callbacks.PlayerCallbackInterface;
 import musicplayer.db.DatabaseManager;
 import musicplayer.db.Gateway;
 import musicplayer.model.Album;
@@ -12,7 +14,7 @@ import javax.swing.tree.TreeNode;
 import java.awt.event.*;
 import java.util.*;
 
-public class PlayerGUI implements PlayerCallbackInterface, LibraryCallbackInterface{
+public class PlayerGUI implements PlayerCallbackInterface, LibraryCallbackInterface {
     private JTree libraryView;
     private JTable playList;
     private JPanel mainPanel;

src/main/java/musicplayer/callbacks/LibraryCallbackInterface.java

@@ -1,4 +1,4 @@
-package musicplayer;
+package musicplayer.callbacks;
 
 public interface LibraryCallbackInterface {
 

src/main/java/musicplayer/callbacks/PlayerCallbackInterface.java

@@ -1,4 +1,4 @@
-package musicplayer;
+package musicplayer.callbacks;
 
 import musicplayer.model.Song;