General tidying and access tightening.

src/main/java/musicplayer/ConfigManager.java

@@ -9,14 +9,17 @@ import java.util.stream.Collectors;
 
 public final class ConfigManager {
 
-    static final String settingsFilename = "settings.cfg";
-    static final File propertiesFile = new File(settingsFilename);
-    static final Properties librarySettings = new Properties();
+    private static final String settingsFilename = "settings.cfg";
+    private static final File propertiesFile = new File(settingsFilename);
+    private static final Properties librarySettings = new Properties();
     // Config Keys
-    static final String foldersKey = "libraryFolders";
-    static final String databaseKey = "databaseDir";
-    static final String libraryDisplayKey = "libraryDisplayKey";
+    private static final String foldersKey = "libraryFolders";
+    private static final String databaseKey = "databaseDir";
+    private static final String libraryDisplayKey = "libraryDisplayKey";
 
+    /**
+     * @return List of directories used for music library indexing.
+     */
     public static List<File> getLibraryDirectories(){
         try(FileInputStream inputStream = new FileInputStream(propertiesFile)){
             librarySettings.load(inputStream);
@@ -33,6 +36,10 @@ public final class ConfigManager {
         return new ArrayList<>();
     }
 
+    /**
+     * Update the list of folders used for music library indexing.
+     * @param folderList Complete list of music folders.
+     */
     public static void saveLibraryDirectories(List<File> folderList){
         librarySettings.setProperty(foldersKey, folderList.stream().map(File::toString).collect(Collectors.joining(",")));
         try(FileWriter fileWriter = new FileWriter(settingsFilename)){
@@ -42,6 +49,9 @@ public final class ConfigManager {
         }
     }
 
+    /**
+     * @return String used to connect to hibernate database.
+     */
     public static String getDatabaseConnectionString() {
         try (FileInputStream inputStream = new FileInputStream(propertiesFile)) {
             librarySettings.load(inputStream);
@@ -53,15 +63,9 @@ public final class ConfigManager {
         return "jdbc:hsqldb:mem:."; // If not set use an in-memory database for now.
     }
 
-    public static void setDatabaseFile(String fileName){
-        librarySettings.setProperty(databaseKey, fileName);
-        try(FileWriter fileWriter = new FileWriter(settingsFilename)){
-            librarySettings.store(fileWriter, "");
-        } catch (IOException e) {
-            e.printStackTrace();
-        }
-    }
-
+    /**
+     * @return Index of the last library display mode used.
+     */
     public static int getLastDisplayTypeIndex(){
         try (FileInputStream inputStream = new FileInputStream(propertiesFile)) {
             librarySettings.load(inputStream);
@@ -73,6 +77,10 @@ public final class ConfigManager {
         return 0;
     }
 
+    /**
+     * Set the stored index of the last library display mode used.
+     * @param index Display mode index.
+     */
     public static void setLastDisplayTypeIndex(Integer index){
         librarySettings.setProperty(libraryDisplayKey, index.toString());
         try(FileWriter fileWriter = new FileWriter(settingsFilename)){

src/main/java/musicplayer/LibraryConfigGUI.java

@@ -7,9 +7,9 @@ import java.awt.BorderLayout;
 import java.io.File;
 import java.util.List;
 
-public class LibraryConfigGUI {
+class LibraryConfigGUI {
     private JList listLibraryFolders;
-    private LibraryListModel listModel = new LibraryListModel();
+    private final LibraryListModel listModel = new LibraryListModel();
     private JPanel mainPanel;
 
     public LibraryConfigGUI(){

src/main/java/musicplayer/LibraryTreeCellRenderer.java

@@ -7,9 +7,9 @@ import javax.swing.tree.DefaultMutableTreeNode;
 import javax.swing.tree.TreeCellRenderer;
 import java.awt.*;
 
-public class LibraryTreeCellRenderer implements TreeCellRenderer {
+class LibraryTreeCellRenderer implements TreeCellRenderer {
 
-    private JLabel label;
+    private final JLabel label;
 
     LibraryTreeCellRenderer() {
         label = new JLabel();

src/main/java/musicplayer/LibraryUtils.java

@@ -13,16 +13,13 @@ import org.jaudiotagger.tag.TagException;
 import java.io.*;
 import java.nio.file.Files;
 import java.nio.file.Path;
-import java.util.Arrays;
 import java.util.List;
 import java.util.Optional;
-import java.util.Properties;
-import java.util.stream.Collectors;
 
-public final class LibraryUtils {
+final class LibraryUtils {
 
-    static final String musicFileExtensionRegex = "(?iu).*\\.(mp3|mp4|flac|ogg)";
-    static Thread updaterThread;
+    private static final String musicFileExtensionRegex = "(?iu).*\\.(mp3|mp4|flac|ogg)";
+    private static Thread updaterThread;
 
     /**
      * Add all songs contained with all paths in rootDirectory to the database.

src/main/java/musicplayer/Player.java

@@ -11,14 +11,14 @@ import org.gstreamer.elements.PlayBin2;
 import java.io.File;
 import java.util.Optional;
 
-public class Player {
+class Player {
 
-    private PlayBin2 playBin;
+    private final PlayBin2 playBin;
 
     private InternalThread internalThread;
     private Thread thread;
     private Song currentSong;
-    private PlayerCallbackInterface callbackInterface;
+    private final PlayerCallbackInterface callbackInterface;
     private int currentVolume = 100;
 
     /**

src/main/java/musicplayer/PlayerGUI.java

@@ -25,18 +25,18 @@ import java.util.concurrent.atomic.AtomicBoolean;
 import java.util.stream.Collectors;
 
 public class PlayerGUI implements PlayerCallbackInterface, LibraryCallbackInterface {
-    public JPanel mainPanel;
-    private JTree libraryView = new JTree();
-    private JTable playList = new JTable();
+    private JPanel mainPanel;
+    private final JTree libraryView = new JTree();
+    private final JTable playList = new JTable();
     private JSlider seekBar;
-    private JComboBox libraryDisplayType = new JComboBox();
-    private Player player = new Player(this);
-    private PlaylistTableModel playlistTableModel = new PlaylistTableModel(new ArrayList<>());
-    private static DefaultMutableTreeNode updatingNode = new DefaultMutableTreeNode();
+    private final JComboBox libraryDisplayType = new JComboBox();
+    private final Player player = new Player(this);
+    private final PlaylistTableModel playlistTableModel = new PlaylistTableModel(new ArrayList<>());
+    private static final DefaultMutableTreeNode updatingNode = new DefaultMutableTreeNode();
     private boolean libraryUpdating = false;
-    private AtomicBoolean seeking = new AtomicBoolean(false);
+    private final AtomicBoolean seeking = new AtomicBoolean(false);
 
-    private Map<String, Runnable> libraryDisplayVariants = createDisplayVariantMap();
+    private final Map<String, Runnable> libraryDisplayVariants = createDisplayVariantMap();
 
     public PlayerGUI() {
         createUI();
@@ -186,7 +186,7 @@ public class PlayerGUI implements PlayerCallbackInterface, LibraryCallbackInterf
     /**
      * Refresh the library with songs in the currently selected display format.
      */
-    public void refreshLibrary() {
+    private void refreshLibrary() {
         DefaultTreeModel model = new DefaultTreeModel(new DefaultMutableTreeNode());
         DefaultMutableTreeNode parentNode = (DefaultMutableTreeNode) model.getRoot();
         DefaultMutableTreeNode newNode = new DefaultMutableTreeNode("Refreshing Library...");

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

@@ -2,8 +2,6 @@ package musicplayer.callbacks;
 
 import musicplayer.model.Song;
 
-import java.util.Optional;
-
 public interface PlayerCallbackInterface {
 
     /**

src/main/java/musicplayer/db/DatabaseManager.java

@@ -15,7 +15,7 @@ import java.util.Properties;
  * Singleton for managing connection to Hibernate.
  */
 public class DatabaseManager {
-    private static DatabaseManager ourInstance = new DatabaseManager();
+    private static final DatabaseManager ourInstance = new DatabaseManager();
 
     private SessionFactory sessionFactory;
 

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

@@ -35,7 +35,7 @@ public class Song implements Comparable<Song> {
     private int discNumber;
 
     @Transient
-    private static int discNumberComparator = 1000;
+    private static final int discNumberComparator = 1000;
 
     protected Song() {
     }

src/main/java/musicplayer/swingmodels/LibraryListModel.java

@@ -19,6 +19,10 @@ public class LibraryListModel extends AbstractListModel {
         return libraryFolders.get(index);
     }
 
+    /**
+     * Add a directory to the list of directories used for library indexing.
+     * @param folder Directory to add.
+     */
     public void addFolder(File folder){
         if(folder.exists() && folder.isDirectory()) {
             libraryFolders.add(folder);
@@ -26,14 +30,26 @@ public class LibraryListModel extends AbstractListModel {
         }
     }
 
+    /**
+     * @return List of directories currently used for library indexing.
+     */
     public List<File> currentFolderList(){
         return new ArrayList<>(libraryFolders); // Copy? Don't want modification via here.
     }
 
+    /**
+     * Check if this File already exists in libraryFolders.
+     * @param file File to find.
+     * @return Does file exist in libraryFolders.
+     */
     public boolean contains(File file){
         return libraryFolders.contains(file);
     }
 
+    /**
+     * Set the list contained in libraryFolders.
+     * @param folderList New directory list.
+     */
     public void setFolderList(List<File> folderList){
         if(folderList != null && folderList.size() > 0)
             libraryFolders = new ArrayList<>(folderList);
@@ -42,6 +58,10 @@ public class LibraryListModel extends AbstractListModel {
         fireContentsChanged(this, 0, libraryFolders.size() == 0 ? 0 : libraryFolders.size() - 1);
     }
 
+    /**
+     * Remove a directory from libraryFolders.
+     * @param file Directory to be removed.
+     */
     public void removeFile(File file){
         libraryFolders.remove(file);
         fireContentsChanged(this, 0, libraryFolders.size() == 0 ? 0 : libraryFolders.size() - 1);

src/main/java/musicplayer/swingmodels/PlaylistTableModel.java

@@ -10,7 +10,7 @@ import java.util.stream.IntStream;
 public class PlaylistTableModel extends AbstractTableModel {
 
     private List<Song> songList;
-    private int playingRow = -1;
+    private int playingRow = -1; // -1 means no song is currently playing.
 
     public PlaylistTableModel(List<Song> songList){
         this.songList = songList;
@@ -58,31 +58,56 @@ public class PlaylistTableModel extends AbstractTableModel {
         return name;
     }
 
+    /**
+     * Add a song to the current playlist.
+     * @param song Song to add to the playlist.
+     */
     public void addSong(Song song){
         songList.add(song);
         fireTableDataChanged();
     }
 
+    /**
+     * @return The first song in the playlist.
+     */
     public Optional<Song> getFirst(){
         return songList.size() > 0 ? Optional.of(songList.get(0)) : Optional.<Song>empty();
     }
 
+    /**
+     * Get the next song in the playlist. (Wraps around)
+     * @param song The current song.
+     * @return The song after the current song.
+     */
     public Optional<Song> nextSong(Song song){
         int index = songList.indexOf(song) + 1;
         if(index >= songList.size()) index = 0;
         return songList.size() > 0 ? Optional.of(songList.get(index)) : Optional.empty();
     }
 
+    /**
+     * Get the previous song in the playlist. (Wraps around)
+     * @param song The current song.
+     * @return The song before the current song.
+     */
     public Optional<Song> previous(Song song){
         int index = songList.indexOf(song) - 1;
         if(index < 0) index = songList.size() - 1;
         return songList.size() > 0 ? Optional.of(songList.get(index)) : Optional.empty();
     }
 
+    /**
+     * @param song Song to find in the current playlist.
+     * @return Index of song in the playlist.
+     */
     public int getSongIndex(Song song){
         return songList.indexOf(song);
     }
 
+    /**
+     * Remove the song at index from the playlist.
+     * @param index List index of the song to be removed.
+     */
     public void removeSong(int index){
         if(songList.size() > index && index >= 0){
             songList.remove(index);
@@ -90,26 +115,46 @@ public class PlaylistTableModel extends AbstractTableModel {
         }
     }
 
+    /**
+     * Remove a number of songs from the playlist.
+     * @param index Indices of the songs to be removed.
+     */
     public void removeSong(int[] index){
         List<Integer> indices = IntStream.of(index).boxed().collect(Collectors.toList());
-        Collections.reverse(indices);
+        Collections.reverse(indices); // Do removals in reverse order to prevent mis-deletion.
         indices.forEach(this::removeSong);
     }
 
+    /**
+     * Remove a song from the playlist.
+     * @param song Song to be removed.
+     */
     public void removeSong(Song song){
         songList.remove(song);
         fireTableDataChanged();
     }
 
+    /**
+     * Remove all songs from the playlist.
+     */
     public void removeAll(){
         songList.clear();
         fireTableDataChanged();
     }
 
+    /**
+     * Get a Song from the playlist based on its index.
+     * @param index Index of the Song to get.
+     * @return Song object at index.
+     */
     public Optional<Song> getSong(int index){
         return songList.size() > 0 && index >= 0 && index < songList.size() ? Optional.of(songList.get(index)) : Optional.empty();
     }
 
+    /**
+     * Set the row at index to have a playing icon.
+     * @param index Row index to display as playing.
+     */
     public void setPlayingRow(int index){
         playingRow = index;
         fireTableDataChanged();