tablerowcomparator.java

基于JXTA开发平台的下载软件开发源代码

/*
 * File    : TableRowComparator.java
 * Created : Nov 14, 2005
 * By      : TuxPaper
 *
 * Copyright (C) 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.table.impl;

import java.util.Comparator;

import org.gudy.azureus2.ui.swt.views.table.TableCellCore;


/**
 * Comparator for TableRow objects based on the sort value of TableCell 
 * in the row.
 * 
 * @author TuxPaper
 */
public class TableRowComparator implements Comparator {
	/** Name of column sort will use */
	public String sColumnName;
	/** Order in which sort will use */
	public boolean bAscending;
	
	/**
	 * Default Constructor
	 * 
	 * @param sSortColumnName
	 * @param bAscending
	 */
	public TableRowComparator(String sSortColumnName, boolean bAscending) {
		this.sColumnName = sSortColumnName;
		this.bAscending = bAscending;
	}

	/* (non-Javadoc)
	 * @see java.util.Comparator#compare(java.lang.Object, java.lang.Object)
	 */
	public int compare(Object arg0, Object arg1) {
		TableCellCore cell0 = ((TableRowImpl)arg0).getTableCellCore(sColumnName);
		TableCellCore cell1 = ((TableRowImpl)arg1).getTableCellCore(sColumnName);
		
		Comparable c0 = (cell0 == null) ? "" : cell0.getSortValue();
		Comparable c1 = (cell1 == null) ? "" : cell1.getSortValue();
		
		try {
			if (bAscending)
				return c0.compareTo(c1);
			
			return c1.compareTo(c0);
		} catch (ClassCastException e) {
			System.err.println("Can't compare " + c0.getClass().getName()
					+ "(" + c0.toString() + ") from row #" 
					+ cell0.getTableRowCore().getIndex() + " to "
					+ c1.getClass().getName()
					+ "(" + c1.toString() + ") from row #"
					+ cell1.getTableRowCore().getIndex() 
					+ " while sorting column " + sColumnName);
			e.printStackTrace();
			return 0;
		}
	}

}