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JCommon is a free general purpose Java class library that is used in several projects at www.jfree.org, including JFreeChart and JFreeReport.
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/* ========================================================================
 * JCommon : a free general purpose class library for the Java(tm) platform
 * ========================================================================
 *
 * (C) Copyright 2000-2005, by Object Refinery Limited and Contributors.
 *
 * Project Info:  http://www.jfree.org/jcommon/index.html
 *
 * This library is free software; you can redistribute it and/or modify it
 * under the terms of the GNU Lesser General Public License as published by
 * the Free Software Foundation; either version 2.1 of the License, or
 * (at your option) any later version.
 *
 * This library 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 Lesser General Public
 * License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301,
 * USA.
 *
 * [Java is a trademark or registered trademark of Sun Microsystems, Inc.
 * in the United States and other countries.]
 *
 * -----------------------
 * SortableTableModel.java
 * -----------------------
 * (C) Copyright 2000-2005, by Object Refinery Limited;
 *
 * Original Author:  David Gilbert (for Object Refinery Limited);
 * Contributor(s):   -;
 *
 * $Id: SortableTableModel.java,v 1.6 2008/09/10 09:26:11 mungady Exp $
 *
 * Changes (from 26-Oct-2001)
 * --------------------------
 * 26-Oct-2001 : Changed package to com.jrefinery.ui.* (DG);
 * 20-Nov-2001 : Made constructor protected (DG);
 * 14-Oct-2002 : Fixed errors reported by Checkstyle (DG);
 *
 */

package org.jfree.ui;

import javax.swing.table.AbstractTableModel;

/**
 * The base class for a sortable table model.
 *
 * @author David Gilbert
 */
public abstract class SortableTableModel extends AbstractTableModel {

    /** The column on which the data is sorted (-1 for no sorting). */
    private int sortingColumn;

    /** Indicates ascending (true) or descending (false) order. */
    private boolean ascending;

    /**
     * Constructs a sortable table model.
     */
    public SortableTableModel() {
        this.sortingColumn = -1;
        this.ascending = true;
    }

    /**
     * Returns the index of the sorting column, or -1 if the data is not sorted
     * on any column.
     *
     * @return the column used for sorting.
     */
    public int getSortingColumn() {
        return this.sortingColumn;
    }

    /**
     * Returns true if the data is sorted in ascending order, and
     * false otherwise.
     *
     * @return true if the data is sorted in ascending order, and
     *         false otherwise.
     */
    public boolean isAscending() {
        return this.ascending;
    }

    /**
     * Sets the flag that determines whether the sort order is ascending or
     * descending.
     *
     * @param flag  the flag.
     */
    public void setAscending(final boolean flag) {
        this.ascending = flag;
    }

    /**
     * Sorts the table.
     *
     * @param column  the column to sort on (zero-based index).
     * @param ascending  a flag to indicate ascending order or descending order.
     */
    public void sortByColumn(final int column, final boolean ascending) {
        if (isSortable(column)) {
            this.sortingColumn = column;
        }
    }

    /**
     * Returns a flag indicating whether or not a column is sortable.
     *
     * @param column  the column (zero-based index).
     *
     * @return boolean.
     */
    public boolean isSortable(final int column) {
        return false;
    }

}