Added functionality for music playback and basic library view.

pom.xml

@@ -25,6 +25,11 @@
             <artifactId>hsqldb</artifactId>
             <version>2.3.3</version>
         </dependency>
+        <dependency>
+            <groupId>com.googlecode.gstreamer-java</groupId>
+            <artifactId>gstreamer-java</artifactId>
+            <version>1.5</version>
+        </dependency>
     </dependencies>
 
     <repositories>

src/main/java/musicplayer/Application.java

@@ -3,6 +3,7 @@ package musicplayer;
 import musicplayer.db.DatabaseManager;
 import musicplayer.db.Gateway;
 import musicplayer.model.ExtractedMetadata;
+import musicplayer.model.Song;
 import org.jaudiotagger.audio.AudioFileIO;
 import org.jaudiotagger.audio.exceptions.CannotReadException;
 import org.jaudiotagger.audio.exceptions.InvalidAudioFrameException;
@@ -14,19 +15,45 @@ import java.io.*;
 
 import java.nio.file.Files;
 import java.nio.file.Path;
+import java.util.List;
 import java.util.Optional;
 
 
 public class Application {
 
-    String musicFileExtensionRegex = ".*\\.(mp3|mp4|flac)";
-
-    public static void main(String[] args) {
-        new Application();
-    }
+    final String musicFileExtensionRegex = ".*\\.(mp3|mp4|flac)";
 
     public Application(){
         DatabaseManager.init();
+        List<Song> songs = Gateway.listAllSongs().get();
+        boolean running = true;
+        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
+        Player player = new Player();
+        while(running){
+            try {
+                System.out.println("Ready to read");
+                String input = br.readLine();
+                System.out.println(input);
+                switch (input) {
+                    case "play":
+                        player.playSong(songs.get(0).getSongFile());
+                        break;
+                    case "stop":
+                        player.stop();
+                        break;
+                    case "pause":
+                        player.pause();
+                        break;
+                    case "resume":
+                        player.resume();
+                        break;
+                    case "quit":
+                        running = false;
+                }
+            } catch (IOException e) {
+                e.printStackTrace();
+            }
+        }
     }
 
     /**

src/main/java/musicplayer/Player.java

@@ -0,0 +1,61 @@
+package musicplayer;
+
+import org.gstreamer.ElementFactory;
+import org.gstreamer.Gst;
+import org.gstreamer.State;
+import org.gstreamer.elements.PlayBin2;
+
+import java.io.File;
+
+public class Player{
+
+    private PlayBin2 playBin;
+
+    private InternalThread internalThread;
+    private Thread thread;
+
+    public Player(){
+        Gst.init();
+        playBin = new PlayBin2("BusMessages");
+        playBin.setVideoSink(ElementFactory.make("fakesink", "videosink"));
+    }
+
+    public void playSong(File songFile){
+        if(playBin.getState() == State.PLAYING)
+            stop();
+        playBin.setURI(songFile.toURI());
+        internalThread = new InternalThread();
+        thread = new Thread(internalThread);
+        playBin.play();
+        thread.start();
+    }
+
+    public void stop() {
+        if (this.thread != null) {
+            playBin.stop();
+            internalThread.stop();
+            thread.interrupt();
+            thread = null;
+        }
+    }
+
+    public void resume(){
+        playBin.play();
+    }
+
+    public void pause(){
+        playBin.pause();
+    }
+
+    private class InternalThread implements Runnable {
+
+        @Override
+        public void run() {
+            Gst.main();
+        }
+
+        public void stop() {
+            Gst.quit();
+        }
+    }
+}

src/main/java/musicplayer/PlayerGUI.form

@@ -0,0 +1,39 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<form xmlns="http://www.intellij.com/uidesigner/form/" version="1" bind-to-class="musicplayer.PlayerGUI">
+  <grid id="27dc6" binding="mainPanel" layout-manager="GridLayoutManager" row-count="1" column-count="2" same-size-horizontally="false" same-size-vertically="false" hgap="-1" vgap="-1">
+    <margin top="0" left="0" bottom="0" right="0"/>
+    <constraints>
+      <xy x="20" y="20" width="500" height="400"/>
+    </constraints>
+    <properties/>
+    <border type="none"/>
+    <children>
+      <scrollpane id="2b209">
+        <constraints>
+          <grid row="0" column="0" row-span="1" col-span="1" vsize-policy="7" hsize-policy="7" anchor="0" fill="3" indent="0" use-parent-layout="false"/>
+        </constraints>
+        <properties/>
+        <border type="none"/>
+        <children>
+          <component id="6b9fd" class="javax.swing.JTree" binding="libraryView">
+            <constraints/>
+            <properties/>
+          </component>
+        </children>
+      </scrollpane>
+      <scrollpane id="359a1">
+        <constraints>
+          <grid row="0" column="1" row-span="1" col-span="1" vsize-policy="7" hsize-policy="7" anchor="0" fill="3" indent="0" use-parent-layout="false"/>
+        </constraints>
+        <properties/>
+        <border type="none"/>
+        <children>
+          <component id="b8fb" class="javax.swing.JList" binding="list1" default-binding="true">
+            <constraints/>
+            <properties/>
+          </component>
+        </children>
+      </scrollpane>
+    </children>
+  </grid>
+</form>

src/main/java/musicplayer/PlayerGUI.java

@@ -0,0 +1,69 @@
+package musicplayer;
+
+import musicplayer.db.DatabaseManager;
+import musicplayer.db.Gateway;
+import musicplayer.model.Album;
+import musicplayer.model.Song;
+
+import javax.swing.*;
+import javax.swing.tree.DefaultMutableTreeNode;
+import javax.swing.tree.DefaultTreeModel;
+import javax.swing.tree.TreeNode;
+import java.util.List;
+import java.util.Map;
+
+public class PlayerGUI {
+    private JTree libraryView;
+    private JList list1;
+    private JPanel mainPanel;
+
+
+    public static void main(String[] args) {
+        JFrame frame = new JFrame();
+        frame.setContentPane(new PlayerGUI().mainPanel);
+        frame.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
+        frame.pack();
+        frame.setVisible(true);
+    }
+
+
+    public PlayerGUI(){
+        DatabaseManager.init();
+        populateLibrary(Gateway.listAllSongsGroupedByAlbum().get());
+    }
+
+    private void resetTree(){
+        libraryView.removeAll();
+        DefaultMutableTreeNode rootNode = new DefaultMutableTreeNode();
+        DefaultTreeModel treeModel = new DefaultTreeModel(rootNode);
+        libraryView.setModel(treeModel);
+        libraryView.setRootVisible(false);
+        libraryView.setToggleClickCount(1);
+    }
+
+    private void populateLibrary(Map<Album, List<Song>> libraryData){
+        resetTree();
+        DefaultMutableTreeNode parentNode = (DefaultMutableTreeNode)libraryView.getModel().getRoot();
+        libraryData.forEach((k, v) -> {
+            DefaultMutableTreeNode albumNode = new DefaultMutableTreeNode(k);
+            addNodeToTreeModel(parentNode, albumNode);
+            v.forEach(x -> addNodeToTreeModel(albumNode, new DefaultMutableTreeNode(x)));
+        });
+    }
+
+    private void populateLibrary(List<Song> libraryData){
+        resetTree();
+        DefaultMutableTreeNode parentNode = (DefaultMutableTreeNode)libraryView.getModel().getRoot();
+        libraryData.forEach(x -> addNodeToTreeModel(parentNode, new DefaultMutableTreeNode(x)));
+
+    }
+
+    private void addNodeToTreeModel(DefaultMutableTreeNode parentNode, DefaultMutableTreeNode node ) {
+        DefaultTreeModel libraryModel = (DefaultTreeModel)libraryView.getModel();
+        libraryModel.insertNodeInto(node, parentNode, parentNode.getChildCount());
+        if (parentNode == libraryModel.getRoot()) {
+            libraryModel.nodeStructureChanged((TreeNode)libraryModel.getRoot());
+        }
+    }
+
+}

src/main/java/musicplayer/model/Album.java

@@ -19,7 +19,7 @@ public class Album {
     }
 
     public String toString(){
-        return String.format("ID: %d, Name: %s", id, name);
+        return name;
     }
 
     @SuppressWarnings("MethodWithMultipleReturnPoints")

src/main/java/musicplayer/model/Artist.java

@@ -26,7 +26,7 @@ public class Artist {
     }
 
     public String toString(){
-        return String.format("ID: %d, Name: %s", id, name);
+        return name;
     }
 
     @SuppressWarnings("MethodWithMultipleReturnPoints")

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

@@ -42,7 +42,7 @@ public class Song {
 
     @Override
     public String toString(){
-        return String.format("Artist: %s, Title: %s, Album: %s, Genre: %s", artist.getName(), title, album.getName(), genre);
+        return title;
     }
 
     @SuppressWarnings("MethodWithMultipleReturnPoints")