Implemented all csf handling

audio/io/DirScanner.java

@@ -0,0 +1,54 @@
+package audio.io;
+
+import java.io.File;
+import java.io.FileFilter;
+import java.io.IOException;
+import java.util.ArrayList;
+import java.util.List;
+
+import audio.Song;
+
+public class DirScanner {
+	
+	public static List<Song> scanDirectories(File f)
+	{
+		if(!f.isDirectory())
+			return null;
+		
+		List<Song> songs = new ArrayList<Song>();
+		
+		FileFilter dirs = new FileFilter()
+		{
+			public boolean accept(File e) {
+				if(e.isDirectory())
+					return true;
+				else
+					return false;
+			}
+		};
+		FileFilter csf = new FileFilter()
+		{
+			public boolean accept(File e) {
+				if(e.isFile() && e.getName().endsWith(".csf"))
+					return true;
+				else
+					return false;
+			}
+		};
+		
+		for(File file : f.listFiles(dirs))
+		{
+			for(File file2 : file.listFiles(csf))
+			{
+				try {
+					Song s = JSONReader.readSong(file2);
+					songs.add(s);
+				} catch (IOException e) {
+					e.printStackTrace();
+				}
+			}
+		}
+		
+		return songs;
+	}
+}