Follow-up to f98edf8: better checks for application restart.

- Fixes resource reloading when OsuGroupList is empty (i.e. if user has no beatmaps installed).
- OsuGroupList is no longer initialized with a class instance; OsuGroupList.create() is called by OsuParser.
- Also clear 'lastOsu' field in MusicController.reset().  Fixes theme song not playing on restart if it was the last track played (i.e. if no beatmaps installed).
- Call MusicController.reset() last so that more garbage is collected.

Signed-off-by: Jeffrey Han <itdelatrisu@gmail.com>

src/itdelatrisu/opsu/Container.java

@@ -91,15 +91,15 @@ public class Container extends AppGameContainer {
 		// close server socket
 		Opsu.closeSocket();
 
-		// prevent loading tracks from re-initializing OpenAL
-		MusicController.reset();
-
 		// destroy images
 		InternalTextureLoader.get().clear();
-		
+
 		// reset image references
 		GameImage.clearReferences();
 		OsuFile.resetImageCache();
+
+		// prevent loading tracks from re-initializing OpenAL
+		MusicController.reset();
 	}
 
 	@Override

src/itdelatrisu/opsu/OsuGroupList.java

@@ -33,7 +33,7 @@ public class OsuGroupList {
 	/**
 	 * Song group structure (each group contains of an ArrayList of OsuFiles).
 	 */
-	private static OsuGroupList list = new OsuGroupList();
+	private static OsuGroupList list;
 
 	/**
 	 * Search pattern for conditional expressions.
@@ -69,6 +69,11 @@ public class OsuGroupList {
 	 */
 	private String lastQuery = "";
 
+	/**
+	 * Creates a new instance of this class (overwriting any previous instance).
+	 */
+	public static void create() { list = new OsuGroupList(); }
+
 	/**
 	 * Returns the single instance of this class.
 	 */

src/itdelatrisu/opsu/OsuParser.java

@@ -67,6 +67,9 @@ public class OsuParser {
 	 * @param height the container height
 	 */
 	public static void parseAllFiles(File root, int width, int height) {
+		// create a new OsuGroupList
+		OsuGroupList.create();
+
 		// progress tracking
 		File[] folders = root.listFiles();
 		currentDirectoryIndex = 0;

src/itdelatrisu/opsu/audio/MusicController.java

@@ -83,9 +83,7 @@ public class MusicController {
 	 * Plays an audio file at the preview position.
 	 */
 	public static void play(final OsuFile osu, final boolean loop) {
-		boolean play = (lastOsu == null || !osu.audioFilename.equals(lastOsu.audioFilename));
+		if (lastOsu == null || !osu.audioFilename.equals(lastOsu.audioFilename)) {
-		lastOsu = osu;
-		if (play) {
 			reset();
 			System.gc();
 
@@ -114,6 +112,7 @@ public class MusicController {
 				break;
 			}
 		}
+		lastOsu = osu;
 	}
 
 	/**
@@ -335,6 +334,7 @@ public class MusicController {
 		}
 
 		// reset state
+		lastOsu = null;
 		themePlaying = false;
 		pauseTime = 0f;
 		trackDimmed = false;

src/itdelatrisu/opsu/states/Splash.java

@@ -113,30 +113,32 @@ public class Splash extends BasicGameState {
 		if (!init) {
 			init = true;
 
-			// load other resources in a new thread
+			if (OsuGroupList.get() != null) {
-			final int width = container.getWidth();
+				// resources already loaded (from application restart)
-			final int height = container.getHeight();
+				finished = true;
-			thread = new Thread() {
+			} else {
-				@Override
+				// load resources in a new thread
-				public void run() {
+				final int width = container.getWidth();
-					// application restart: everything already loaded
+				final int height = container.getHeight();
-					if (OsuGroupList.get().size() < 1) {
+				thread = new Thread() {
+					@Override
+					public void run() {
 						File beatmapDir = Options.getBeatmapDir();
 
 						// unpack all OSZ archives
 						OszUnpacker.unpackAllFiles(Options.getOSZDir(), beatmapDir);
-	
+
 						// parse song directory
 						OsuParser.parseAllFiles(beatmapDir, width, height);
 
 						// load sounds
 						SoundController.init();
-					}
 
-					finished = true;
+						finished = true;
-				}
+					}
-			};
+				};
-			thread.start();
+				thread.start();
+			}
 		}
 
 		// fade in logo