Need a Help building Longer datatypes

Hi Friends,
I have a Complex problem right now.
I am trying to build a longer datatypes of an unsinged interger where in we can specify the length of it where in we can specify number of bits required to store the data and is this is exceeding the long int data type of c++.
I tried to build this by using the concepts of unsigned integer algorithm.
I would really appericiate if some one can help me in converting it too java.
One of the main difficulties i am facing right now is i do not have any idea about how to overload Arithmatic operators like (+,-,*,/ ,% ....) in java.
I would really grateful if somebody can help me in this regards....
Thanks in adavance!!!
Regards,
RAHUL

Hi Friends,
I have a Complex problem right now.
I am trying to build a longer datatypes of an
unsinged interger where in we can specify the length
of it where in we can specify number of bits required
to store the data and is this is exceeding the
long int data type of c++.
I tried to build this by using the concepts of
unsigned integer algorithm.
I would really appericiate if some one can help me in
converting it too java.BigInteger?
>
One of the main difficulties i am facing right now is
i do not have any idea about how to overload
Arithmatic operators like (+,-,*,/ ,% ....) in
java.
That's 'cause java doesn't support operator overloading.
I would really grateful if somebody can help me in
this regards....
Thanks in adavance!!!
Regards,
RAHUL

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            ((InfoThreadListener) l).threadException(this, ex);
       * notify all <code>InfoThreadListener</code>s of the progress of this thread
       * @param progressValue long  a value indicating the current thread progress
      protected void fireThreadProgress(long progressValue) {
        Enumeration e = listeners.elements();
        while(e.hasMoreElements()) {
          Object l = e.nextElement();
          if(l instanceof InfoThreadListener) {
            ((InfoThreadListener) l).threadProgress(this, progressValue, maxValue);
       * set the status of this thread and notify all listeners
       * @param newStatus int  the status this thread is to be changed to
      private void setStatus(int newStatus) {
        //System.out.println("InfoThread.setStatus oldStatus=" + status + ", newStatus=" + newStatus);
        int fromStatus = status;
        status = newStatus;
        fireThreadStatusChanged(fromStatus, newStatus);
       * get the current status of this thread
       * @return int  the status
      public int getStatus() {
        return status;
       * cleanup before actual destruction.
      public void destroy() {
        //System.out.println("InfoThread.destroy");
        cleanup();
        super.destroy();
       * cleanup all references this thread maintains
      private void cleanup() {
        //System.out.println("InfoThread.cleanup");
        listeners.removeAllElements();
        listeners = null;
      /* ----------------------- class fields start ------------------------ */
      /** storage for the objects this thread notifies about status changes and progress */
      private Vector listeners = new Vector();
      /** indicator for the status of this thread */
      private int status = STATUS_NONE;
      /** maximum value for threadProgress */
      protected long maxValue = -1;
      /** the idle time inside one work cycle in milliseconds */
      protected long idleMillis = 1;
      /* ----------------------- class fields end -------------------------- */
      /* ----------------------- constants start --------------------------- */
      /** constant value indicating that no status has been set so far */
      public static final int STATUS_NONE = 0;
      /** constant value indicating that the thread is currently initializing */
      public static final int STATUS_INITIALIZING = 1;
      /** constant value indicating that the thread is ready to run */
      public static final int STATUS_READY = 2;
      /** constant value indicating that the thread is running */
      public static final int STATUS_RUNNING = 3;
      /** constant value indicating that the thread is about to halt */
      public static final int STATUS_HALT_PENDING = 4;
      /** constant value indicating that the thread is halted */
      public static final int STATUS_HALTED = 5;
      /** constant value indicating that the work of this thread is complete */
      public static final int STATUS_WORK_COMPLETE = 6;
      /** constant value indicating that the thread is about to stop */
      public static final int STATUS_STOP_PENDING = 7;
      /** constant value indicating that the thread is stopped */
      public static final int STATUS_STOPPED = 8;
      /** constant value indicating that the thread is finished */
      public static final int STATUS_THREAD_FINISHED = 9;
      /* ----------------------- constants end --------------------------- */
    }this is the InfoThreadListener interface
    * Light Development Java Library
    * Copyright (C) 2003, 2004 Ulrich Hilger
    * This program is free software; you can redistribute it and/or
    * modify it under the terms of the GNU General Public License
    * as published by the Free Software Foundation; either version 2
    * of the License, or (at your option) any later version.
    * This program is distributed in the hope that it will be useful,
    * but WITHOUT ANY WARRANTY; without even the implied warranty of
    * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    * GNU General Public License for more details.
    * You should have received a copy of the GNU General Public License
    * along with this program; if not, write to the Free Software
    * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
    package com.lightdev.lib.util;
    * An interface classes interested to receive events from objects
    * of class <code>InfoThread</code> need to implement.
    * @author Ulrich Hilger
    * @author Light Development
    * @author <a href="http://www.lightdev.com">http://www.lightdev.com</a>
    * @author <a href="mailto:[email protected]">[email protected]</a>
    * @author published under the terms and conditions of the
    *      GNU General Public License,
    *      for details see file gpl.txt in the distribution
    *      package of this software
    * @version Version 1, October 13, 2004
    public interface InfoThreadListener {
       * method to receive a status change notification from a thread
       * @param thread InfoThread  the thread which status changed
       * @param fromStatus int  the status which the thread had before the change
       * @param toStatus int  the status which the thread has now
      public void threadStatusChanged(InfoThread thread, int fromStatus, int toStatus);
       * method to receive a notification about the progress of a thread
       * @param thread InfoThread  the thread which notified about its progress
       * @param progressValue long  the value (e.g. 10 if 100 percent completed, 20 of 1 million files processed, etc.)
      public void threadProgress(InfoThread thread, long progressValue, long maxValue);
       * method to receive a notifiaction about the fact that an exception occurred in a thread
       * @param thread InfoThread  the thread for which an exception occurred
       * @param e Exception  the exception that occurred
      public void threadException(InfoThread thread, Exception e);
    }This is class AudioFileDescriptor
    * Light Development Java Library
    * Copyright (C) 2004 Ulrich Hilger
    * This program is free software; you can redistribute it and/or
    * modify it under the terms of the GNU General Public License
    * as published by the Free Software Foundation; either version 2
    * of the License, or (at your option) any later version.
    * This program is distributed in the hope that it will be useful,
    * but WITHOUT ANY WARRANTY; without even the implied warranty of
    * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    * GNU General Public License for more details.
    * You should have received a copy of the GNU General Public License
    * along with this program; if not, write to the Free Software
    * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
    package com.lightdev.lib.audio;
    import java.io.FileNotFoundException;
    import java.io.IOException;
    import java.io.RandomAccessFile;
    import java.io.Serializable;
    import java.text.DecimalFormat;
    * This class models characteristics of an audio file such as the absolute path
    * of the file, its tag contents (if any) and the play duration, etc.
    * <p>See <a href="http://www.id3.org">http://www.id3.org</a> for details about
    * ID3 tags.</p>
    * @author Ulrich Hilger
    * @author Light Development
    * @author <a href="http://www.lightdev.com">http://www.lightdev.com</a>
    * @author <a href="mailto:[email protected]">[email protected]</a>
    * @author published under the terms and conditions of the
    *      GNU General Public License,
    *      for details see file gpl.txt in the distribution
    *      package of this software
    * @version Version 1, October 13, 2004
    public class AudioFileDescriptor implements Serializable, Comparable {
      public AudioFileDescriptor(String absolutePath) throws FileNotFoundException, IOException {
        load(absolutePath);
      public boolean equals(Object o) {
        if(o != null && o instanceof AudioFileDescriptor) {
          return ((AudioFileDescriptor) o).getAbsolutePath().equalsIgnoreCase(this.getAbsolutePath());
        else {
          return false;
      public void load(String absolutePath) throws FileNotFoundException, IOException {
        this.absolutePath = absolutePath;
        RandomAccessFile rf = new RandomAccessFile(absolutePath, "r");
        if(id3v11Tag == null) {
          id3v11Tag = new ID3v11Tag(rf, false);
        else {
          id3v11Tag.readTag(rf, rf.length() - 128);
        rf.close();
      public String getAbsolutePath() {
        return absolutePath;
      public ID3v11Tag getID3v11Tag() {
        return id3v11Tag;
      public void setID3v11Tag(ID3v11Tag tag) {
        this.id3v11Tag = tag;
      public String toString() {
        DecimalFormat df = new DecimalFormat("00");
        return id3v11Tag.getArtist() + ", " + id3v11Tag.getAlbum() + " - " +
            df.format(id3v11Tag.getTrackNumber()) + " " + id3v11Tag.getTitle();
       * Compares this object with the specified object for order.
       * @param o the Object to be compared.
       * @return a negative integer, zero, or a positive integer as this object is less than, equal to,
       *   or greater than the specified object.
       * @todo Implement this java.lang.Comparable method
      public int compareTo(Object o) {
        return toString().compareTo(o.toString());
      private String absolutePath;
      private ID3v11Tag id3v11Tag;
      private transient long duration = -1;
      private transient int type = TYPE_UNKNOWN;
      public static final transient int TYPE_UNKNOWN = 0;
      public static final transient int TYPE_MP3 = 1;
    }This is class ID3V11Tag into which the data is actually stored
    * Light Development Java Library
    * Copyright (C) 2004 Ulrich Hilger
    * This program is free software; you can redistribute it and/or
    * modify it under the terms of the GNU General Public License
    * as published by the Free Software Foundation; either version 2
    * of the License, or (at your option) any later version.
    * This program is distributed in the hope that it will be useful,
    * but WITHOUT ANY WARRANTY; without even the implied warranty of
    * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    * GNU General Public License for more details.
    * You should have received a copy of the GNU General Public License
    * along with this program; if not, write to the Free Software
    * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
    package com.lightdev.lib.audio;
    import java.io.File;
    import java.io.RandomAccessFile;
    import java.io.IOException;
    import java.io.Serializable;
    import java.text.DecimalFormat;
    * This class is a very simple implementation of an ID3v11Tag. It models an ID3 tag
    * pretty much the same way as it is physically stored inside an audio file.
    * <p>See <a href="http://www.id3.org">http://www.id3.org</a> for details about
    * ID3 tags.</p>
    * @author Ulrich Hilger
    * @author Light Development
    * @author <a href="http://www.lightdev.com">http://www.lightdev.com</a>
    * @author <a href="mailto:[email protected]">[email protected]</a>
    * @author published under the terms and conditions of the
    *      GNU General Public License,
    *      for details see file gpl.txt in the distribution
    *      package of this software
    * @version Version 1, October 13, 2004
    public class ID3v11Tag implements Serializable, Comparable {
       * construct an ID3v11Tag and read tag content from a given file
       * <p>This constructor can be used for cases where a RandomAccessFile has already
       * been opened and will be closed elsewhere</p>
       * @param rf RandomAccessFile  the open file to read from
       * @param isAtTagStartPos boolean  true, if the file pointer is at the
       * position where the ID3 tag starts; when false, the pointer is positioned accordingly here
       * @throws IOException
      public ID3v11Tag(RandomAccessFile rf, boolean isAtTagStartPos) throws IOException {
        if(isAtTagStartPos) {
          readTag(rf);
        else {
          readTag(rf, rf.length() - 128);
       * construct an ID3v11Tag and read tag content from a file at a given location
       * <p>This constructor opens and closes the audio file for reading</p>
       * @param absolutePath String  the absolute path to the audio file to open
       * @throws IOException
      public ID3v11Tag(String absolutePath) throws IOException {
        RandomAccessFile rf = new RandomAccessFile(absolutePath, "r");
        readTag(rf, rf.length() - 128);
        rf.close();
       * construct an ID3v11Tag and read tag content from a given file
       * <p>This constructor opens and closes the audio file for reading</p>
       * @param audioFile File  the audio file to read from
       * @throws IOException
      public ID3v11Tag(File audioFile) throws IOException {
        this(audioFile.getAbsolutePath());
       * get a string representation of this object
       * @return String
      public String toString() {
        DecimalFormat df = new DecimalFormat("00");
        return getArtist() + ", " + getAlbum() + " - " + df.format(getTrackNumber()) + " " + getTitle();
       * position to file pointer and read the tag
       * @param rf RandomAccessFile  the file to read from
       * @param jumpPos long  the position to jump to (the tag start position)
       * @throws IOException
      public void readTag(RandomAccessFile rf, long jumpPos) throws IOException {
        rf.seek(jumpPos);
        readTag(rf);
       * read the tag from a given file, assuming the file pointer to be at the tag start position
       * @param rf RandomAccessFile  the file to read from
       * @throws IOException
      public void readTag(RandomAccessFile rf) throws IOException {
        rf.read(tagBuf);
        if(tag.equalsIgnoreCase(new String(tagBuf))) {
          rf.read(title);
          rf.read(artist);
          rf.read(album);
          rf.read(year);
          rf.read(comment);
          rf.read(trackNo);
          rf.read(genre);
      public String getTitle() {
        return new String(title).trim();
      public String getArtist() {
        return new String(artist).trim();
      public String getAlbum() {
        return new String(album).trim();
      public String getYear() {
        return new String(year).trim();
      public String getComment() {
        return new String(comment).trim();
      public int getGenreId() {
        try {
          int id = new Byte(genre[0]).intValue();
          if(id < GENRE_ID_MIN || id > GENRE_ID_MAX) {
            return GENRE_ID_OTHER;
          else {
            return id;
        catch(Exception ex) {
          return GENRE_ID_OTHER;
      public String getGenreName() {
        return genreNames[getGenreId()];
      public int getTrackNumber() {
        try {
          return (int) trackNo[0];
        catch(Exception e) {
          return 0;
       * Compares this object with the specified object for order.
       * @param o the Object to be compared.
       * @return a negative integer, zero, or a positive integer as this object is less than, equal to,
       *                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       

    Hi Franck,
    thank you, mate. I did what you suggested (changed class attached) but that did not change the mentioned behaviour.
    The first run is approximately 75 seconds with Java option -Xms40m and approx. double without, the second run and all subsequent runs are only 2-3 seconds each (!!!) even when terminating and re-starting the application between thread runs.
    I'm pretty clueless about that, any more help on this anyone?
    Thanks a lot and best regards
    Ulrich
    PS: BTW, I forgot to post the class that is filled with data by class CollectionThread, so here it is
    * Light Development Playlist Editor
    * Copyright (C) 2004 Ulrich Hilger
    * This program is free software; you can redistribute it and/or
    * modify it under the terms of the GNU General Public License
    * as published by the Free Software Foundation; either version 2
    * of the License, or (at your option) any later version.
    * This program is distributed in the hope that it will be useful,
    * but WITHOUT ANY WARRANTY; without even the implied warranty of
    * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    * GNU General Public License for more details.
    * You should have received a copy of the GNU General Public License
    * along with this program; if not, write to the Free Software
    * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
    package com.lightdev.app.playlisteditor.data;
    import java.io.File;
    import com.lightdev.lib.audio.ID3v11Tag;
    import javax.sound.sampled.UnsupportedAudioFileException;
    import java.io.IOException;
    import java.io.Serializable;
    import com.lightdev.lib.audio.AudioFileDescriptor;
    import com.lightdev.lib.ui.SortListModel;
    import java.util.Iterator;
    * Storage model for audio data.
    * <p>
    * <code>AudioDataModel</code> can be used to store ID3 tag data collected from
    * a directory with audio files to perform queries and reports on the found data.
    * </p>
    * <p>See <a href="http://www.id3.org">http://www.id3.org</a> for details about
    * ID3 tags.</p>
    * @author Ulrich Hilger
    * @author Light Development
    * @author <a href="http://www.lightdev.com">http://www.lightdev.com</a>
    * @author <a href="mailto:[email protected]">[email protected]</a>
    * @author published under the terms and conditions of the
    *      GNU General Public License,
    *      for details see file gpl.txt in the distribution
    *      package of this software as well as any licensing notes
    *      inside this documentation
    * @version 1, October 15, 2004
    public class AudioDataModel extends SortListModel implements Serializable {
       * constructor
      public AudioDataModel() {
       * add an audio track from a given audio file
       * <p>This will attempt to read ID3 tag data from the file.</p>
       * @param audioFile File  the file to add audio data for
       * @throws IOException
      public void addTrack(File audioFile) throws IOException {
        AudioFileDescriptor afd = new AudioFileDescriptor(audioFile.getAbsolutePath());
        if (!data.contains(afd)) {
          data.add(afd);
       * get all tracks for agiven combination of genre name, artist name and album name. Any of
       * the parameters may be null or AudioDataModel.FILTER_ALL
       * <p>Ugly code, I know, but it simply hard codes all combinations of the the mentioned
       * parameters. Any more elegant implementations welcome.</p>
       * @param genreName String  a genre name to get tracks for
       * @param artistName String  an artist name to get tracks for
       * @param albumName String  an album name to get tracks for
       * @return SortListModel   the found tracks in a list model
      public SortListModel getTracks(String genreName, String artistName, String albumName) {
        SortListModel foundTracks = new SortListModel();
        Iterator e = data.iterator();
        while(e.hasNext()) {
          AudioFileDescriptor afd = (AudioFileDescriptor) e.next();
          ID3v11Tag tag = afd.getID3v11Tag();
          if(genreName == null || genreName.equalsIgnoreCase(FILTER_ALL)) {
            if(artistName == null || artistName.equalsIgnoreCase(FILTER_ALL)) {
              if (tag.getAlbum().equalsIgnoreCase(albumName))
                foundTracks.add(afd);
            else {
              if(albumName == null || albumName.equalsIgnoreCase(FILTER_ALL)) {
                if (tag.getArtist().equalsIgnoreCase(artistName))
                  foundTracks.add(afd);
              else {
                if (tag.getArtist().equalsIgnoreCase(artistName) &&
                    tag.getAlbum().equalsIgnoreCase(albumName))
                  foundTracks.add(afd);
          else {
            if(artistName == null || artistName.equalsIgnoreCase(FILTER_ALL)) {
              if(albumName == null || albumName.equalsIgnoreCase(FILTER_ALL)) {
                if (tag.getGenreName().equalsIgnoreCase(genreName))
                  foundTracks.add(afd);
              else {
                if (tag.getGenreName().equalsIgnoreCase(genreName) &&
                    tag.getAlbum().equalsIgnoreCase(albumName))
                  foundTracks.add(afd);
            else {
              if(albumName == null || albumName.equalsIgnoreCase(FILTER_ALL)) {
                if (tag.getGenreName().equalsIgnoreCase(genreName) &&
                    tag.getArtist().equalsIgnoreCase(artistName))
                  foundTracks.add(afd);
              else {
                if (tag.getGenreName().equalsIgnoreCase(genreName) &&
                    tag.getArtist().equalsIgnoreCase(artistName) &&
                    tag.getAlbum().equalsIgnoreCase(albumName))
                  foundTracks.add(afd);
        foundTracks.sort();
        return foundTracks;
       * list all artists in this model
       * @return SortListModel
      public SortListModel listArtists() {
        SortListModel artists = new SortListModel();
        artists.add(FILTER_ALL);
        Iterator e = data.iterator();
        while (e.hasNext()) {
          ID3v11Tag tag = ((AudioFileDescriptor) e.next()).getID3v11Tag();
          String artistName = tag.getArtist();
          if (artists.indexOf(artistName) < 0) {
            artists.add(artistName);
        artists.sort();
        return artists;
       * list all artists in this model having titles belonging to a given genre
       * @param genreName String  name of the genre artists are searched for
       * @return SortListModel
      public SortListModel listArtists(String genreName) {
        SortListModel artists = new SortListModel();
        artists.add(FILTER_ALL);
        Iterator e = data.iterator();
        while (e.hasNext()) {
          ID3v11Tag tag = ((AudioFileDescriptor) e.next()).getID3v11Tag();
          String artistName = tag.getArtist();
          String genre = tag.getGenreName();
          if (artists.indexOf(artistName) < 0 && genre.equalsIgnoreCase(genreName)) {
            artists.add(artistName);
        artists.sort();
        return artists;
       * list all genres in this model
       * @return SortListModel
      public SortListModel listGenres() {
        SortListModel genres = new SortListModel();
        genres.add(FILTER_ALL);
        Iterator e = data.iterator();
        while (e.hasNext()) {
          ID3v11Tag tag = ((AudioFileDescriptor) e.next()).getID3v11Tag();
          String genreName = tag.getGenreName();
          if (genres.indexOf(genreName) < 0) {
            genres.add(genreName);
        genres.sort();
        return genres;
       * list all albums in this model
       * @return SortListModel
      public SortListModel listAlbums() {
        SortListModel albums = new SortListModel();
        albums.add(FILTER_ALL);
        Iterator e = data.iterator();
        while (e.hasNext()) {
          ID3v11Tag tag = ((AudioFileDescriptor) e.next()).getID3v11Tag();
          String albumName = tag.getAlbum();
          if (albums.indexOf(albumName) < 0) {
            albums.add(albumName);
        albums.sort();
        return albums;
       * list all albums in this model having titles belonging to a given genre
       * @param genreName String  name of the genre albums are searched for
       * @return SortListModel
      public SortListModel listAlbums(String genreName) {
        SortListModel albums = new SortListModel();
        albums.add(FILTER_ALL);
        Iterator e = data.iterator();
        while (e.hasNext()) {
          ID3v11Tag tag = ((AudioFileDescriptor) e.next()).getID3v11Tag();
          String albumName = tag.getAlbum();
          String genre = tag.getGenreName();
          if (albums.indexOf(albumName) < 0 && genre.equalsIgnoreCase(genreName)) {
            albums.add(albumName);
        albums.sort();
        return albums;
       * list all albums in this model having titles belonging to a given genre and artist
       * @param genreName String  name of the genre albums are searched for
       * @param artistName String  name of the artist albums are searched for
       * @return SortListModel
      public SortListModel listAlbums(String genreName, String artistName) {
        SortListModel albums = new SortListModel();
        albums.add(FILTER_ALL);
        Iterator e = data.iterator();
        while (e.hasNext()) {
          ID3v11Tag tag = ((AudioFileDescriptor) e.next()).getID3v11Tag();
          String albumName = tag.getAlbum();
          String genre = tag.getGenreName();
          String artist = tag.getArtist();
          if(genreName == null || genreName.equalsIgnoreCase(FILTER_ALL)) {
            if (albums.indexOf(albumName) < 0 &&
                artist.equalsIgnoreCase(artistName))
              albums.add(albumName);
          else {
            if (albums.indexOf(albumName) < 0 &&
                genre.equalsIgnoreCase(genreName) &&
                artist.equalsIgnoreCase(artistName))
              albums.add(albumName);
        albums.sort();
        return albums;
       * get the number of audio tracks stored in this data model
       * @return int  the number of tracks
      public int getTrackCount() {
        return data.size();
      /** constant to select all items of a given part */
      public static final String FILTER_ALL = "    all";
    }...and here the changed CollectionThread now caching found File objects in a vector
    * Light Development Playlist Editor
    * Copyright (C) 2004 Ulrich Hilger
    * This program is free software; you can redistribute it and/or
    * modify it under the terms of the GNU General Public License
    * as published by the Free Software Foundation; either version 2
    * of the License, or (at your option) any later version.
    * This program is distributed in the hope that it will be useful,
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    package com.lightdev.app.playlisteditor.data;
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    * @author published under the terms and conditions of the
    *      GNU General Public License,
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