/*
 * File    : RankItem.java
 * Created : 24 nov. 2003
 * By      : Olivier
 *
 * Copyright (C) 2004, 2005, 2006 Aelitis SAS, All rights Reserved
 *
 * 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.
 *
 * 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 ( see the LICENSE file ).
 *
 * 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
 *
 * AELITIS, SAS au capital de 46,603.30 euros,
 * 8 Allee Lenotre, La Grille Royale, 78600 Le Mesnil le Roi, France.
 */
 
package org.gudy.azureus2.ui.swt.views.tableitems.mytorrents;

import org.gudy.azureus2.core3.download.DownloadManager;
import org.gudy.azureus2.core3.download.DownloadManagerListener;
import org.gudy.azureus2.core3.global.GlobalManager;
import org.gudy.azureus2.core3.global.GlobalManagerListener;
import org.gudy.azureus2.plugins.ui.tables.*;
import org.gudy.azureus2.ui.swt.views.table.utils.CoreTableColumn;

import com.aelitis.azureus.core.AzureusCoreFactory;

/**
 * Torrent Position column.
 * 
 * One object for all rows to save memory
 * 
 * @author Olivier
 * @author TuxPaper (2004/Apr/17: modified to TableCellAdapter)
 */
public class RankItem
       extends CoreTableColumn 
       implements TableCellRefreshListener
{
	private boolean bInvalidByTrigger = false;

  /** Default Constructor */
  public RankItem(String sTableID) {
    super("#", ALIGN_TRAIL, POSITION_LAST, 50, sTableID);
    setRefreshInterval(INTERVAL_INVALID_ONLY);
    GlobalManager gm = AzureusCoreFactory.getSingleton().getGlobalManager();
    gm.addListener(new GMListener());
    setMaxWidthAuto(true);
    setMinWidthAuto(true);
  }

  public void refresh(TableCell cell) {
  	bInvalidByTrigger = false;

    DownloadManager dm = (DownloadManager)cell.getDataSource();
    long value = (dm == null) ? 0 : dm.getPosition();
    cell.setSortValue(value);
    cell.setText(String.valueOf(value));
  }
  
  private class GMListener implements GlobalManagerListener {
    	DownloadManagerListener listener;
    	
    	public GMListener() {
    		 listener = new DownloadManagerListener() {
					public void completionChanged(DownloadManager manager, boolean bCompleted) {
					}

					public void downloadComplete(DownloadManager manager) {
					}

					public void positionChanged(DownloadManager download, int oldPosition, int newPosition) {
						/** We will be getting multiple position changes, but we only need
						 * to invalidate cells once.
						 */
						if (bInvalidByTrigger)
							return;
						RankItem.this.invalidateCells();
						bInvalidByTrigger = true;
					}

					public void stateChanged(DownloadManager manager, int state) {
					}
					public void
					filePriorityChanged( DownloadManager download, org.gudy.azureus2.core3.disk.DiskManagerFileInfo file )
					{	  
					}
    		 };
    	}
    	
			public void destroyed() {
			}

			public void destroyInitiated() {
				GlobalManager gm = AzureusCoreFactory.getSingleton().getGlobalManager();
				gm.removeListener(this);
			}

			public void downloadManagerAdded(DownloadManager dm) {
				dm.addListener(listener);
			}

			public void downloadManagerRemoved(DownloadManager dm) {
				dm.removeListener(listener);
			}

			public void seedingStatusChanged(boolean seeding_only_mode) {
			}
  }
}