tablesorter.java

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                Arrays.sort(viewToModel);
            }
        }

        return viewToModel;
    }

    public int modelIndex(int viewIndex) {
        return getViewToModel()[viewIndex].modelIndex;
    }

    private int[] getModelToView() {

        if (modelToView == null) {
            int n = getViewToModel().length;

            modelToView = new int[n];

            for (int i = 0; i < n; i++) {
                modelToView[modelIndex(i)] = i;
            }
        }

        return modelToView;
    }

    // TableModel interface methods
    public int getRowCount() {
        return (tableModel == null) ? 0
                                    : tableModel.getRowCount();
    }

    public int getColumnCount() {
        return (tableModel == null) ? 0
                                    : tableModel.getColumnCount();
    }

    public String getColumnName(int column) {
        return tableModel.getColumnName(column);
    }

    public Class getColumnClass(int column) {
        return tableModel.getColumnClass(column);
    }

    public boolean isCellEditable(int row, int column) {
        return tableModel.isCellEditable(modelIndex(row), column);
    }

    public Object getValueAt(int row, int column) {
        return tableModel.getValueAt(modelIndex(row), column);
    }

    public void setValueAt(Object aValue, int row, int column) {
        tableModel.setValueAt(aValue, modelIndex(row), column);
    }

    // Helper classes
    private class Row implements Comparable {

        private int modelIndex;

        public Row(int index) {
            this.modelIndex = index;
        }

        public int compareTo(Object o) {

            int row1 = modelIndex;
            int row2 = ((Row) o).modelIndex;

            for (Iterator it = sortingColumns.iterator(); it.hasNext(); ) {
                Directive directive  = (Directive) it.next();
                int       column     = directive.column;
                Object    o1         = tableModel.getValueAt(row1, column);
                Object    o2         = tableModel.getValueAt(row2, column);
                int       comparison = 0;

                // Define null less than everything, except null.
                if (o1 == null && o2 == null) {
                    comparison = 0;
                } else if (o1 == null) {
                    comparison = -1;
                } else if (o2 == null) {
                    comparison = 1;
                } else {
                    comparison = getComparator(column).compare(o1, o2);
                }

                if (comparison != 0) {
                    return directive.direction == DESCENDING ? -comparison
                                                             : comparison;
                }
            }

            return 0;
        }
    }

    private class TableModelHandler implements TableModelListener {

        public void tableChanged(TableModelEvent e) {

            // If we're not sorting by anything, just pass the event along.
            if (!isSorting()) {
                clearSortingState();
                fireTableChanged(e);

                return;
            }

            // If the table structure has changed, cancel the sorting; the
            // sorting columns may have been either moved or deleted from
            // the model.
            if (e == null || e.getFirstRow() == TableModelEvent.HEADER_ROW) {
                cancelSorting();
                fireTableChanged(e);

                return;
            }

            // We can map a cell event through to the view without widening
            // when the following conditions apply:
            //
            // a) all the changes are on one row (e.getFirstRow() == e.getLastRow()) and,
            // b) all the changes are in one column (column != TableModelEvent.ALL_COLUMNS) and,
            // c) we are not sorting on that column (getSortingStatus(column) == NOT_SORTED) and,
            // d) a reverse lookup will not trigger a sort (modelToView != null)
            //
            // Note: INSERT and DELETE events fail this test as they have column == ALL_COLUMNS.
            //
            // The last check, for (modelToView != null) is to see if modelToView
            // is already allocated. If we don't do this check; sorting can become
            // a performance bottleneck for applications where cells
            // change rapidly in different parts of the table. If cells
            // change alternately in the sorting column and then outside of
            // it this class can end up re-sorting on alternate cell updates -
            // which can be a performance problem for large tables. The last
            // clause avoids this problem.
            int column = e.getColumn();

            if (e.getFirstRow() == e.getLastRow()
                    && column != TableModelEvent.ALL_COLUMNS
                    && getSortingStatus(column) == NOT_SORTED
                    && modelToView != null) {
                int viewIndex = getModelToView()[e.getFirstRow()];

                fireTableChanged(new TableModelEvent(TableSorter.this,
                                                     viewIndex, viewIndex,
                                                     column, e.getType()));

                return;
            }

            // Something has happened to the data that may have invalidated the row order.
            clearSortingState();
            fireTableDataChanged();

            return;
        }
    }

    private class MouseHandler extends MouseAdapter {

        public void mouseClicked(MouseEvent e) {

            JTableHeader     h           = (JTableHeader) e.getSource();
            TableColumnModel columnModel = h.getColumnModel();
            int viewColumn = columnModel.getColumnIndexAtX(e.getX());
            int column = columnModel.getColumn(viewColumn).getModelIndex();

            if (column != -1) {
                int status = getSortingStatus(column);

                if (!e.isControlDown()) {
                    cancelSorting();
                }

                // Cycle the sorting states through {NOT_SORTED, ASCENDING, DESCENDING} or
                // {NOT_SORTED, DESCENDING, ASCENDING} depending on whether shift is pressed.
                status = status + (e.isShiftDown() ? -1
                                                   : 1);
                status = (status + 4) % 3 - 1;    // signed mod, returning {-1, 0, 1}

                setSortingStatus(column, status);
            }
        }
    }

    private static class Arrow implements Icon {

        private boolean descending;
        private int     size;
        private int     priority;

        public Arrow(boolean descending, int size, int priority) {

            this.descending = descending;
            this.size       = size;
            this.priority   = priority;
        }

        public void paintIcon(Component c, Graphics g, int x, int y) {

            Color color = c == null ? Color.gray
                                    : c.getBackground();

            // In a compound sort, make each succesive triangle 20%
            // smaller than the previous one.
            int dx = (int) (size / 2 * Math.pow(0.8, priority));
            int dy = descending ? dx
                                : -dx;

            // Align icon (roughly) with font baseline.
            y = y + 5 * size / 6 + (descending ? -dy
                                               : 0);

            int shift = descending ? 1
                                   : -1;

            g.translate(x, y);

            // Right diagonal.
            g.setColor(color.darker());
            g.drawLine(dx / 2, dy, 0, 0);
            g.drawLine(dx / 2, dy + shift, 0, shift);

            // Left diagonal.
            g.setColor(color.brighter());
            g.drawLine(dx / 2, dy, dx, 0);
            g.drawLine(dx / 2, dy + shift, dx, shift);

            // Horizontal line.
            if (descending) {
                g.setColor(color.darker().darker());
            } else {
                g.setColor(color.brighter().brighter());
            }

            g.drawLine(dx, 0, 0, 0);
            g.setColor(color);
            g.translate(-x, -y);
        }

        public int getIconWidth() {
            return size;
        }

        public int getIconHeight() {
            return size;
        }
    }

    private class SortableHeaderRenderer implements TableCellRenderer {

        private TableCellRenderer tableCellRenderer;

        public SortableHeaderRenderer(TableCellRenderer tableCellRenderer) {
            this.tableCellRenderer = tableCellRenderer;
        }

        public Component getTableCellRendererComponent(JTable table,
                Object value, boolean isSelected, boolean hasFocus, int row,
                int column) {

            Component c =
                tableCellRenderer.getTableCellRendererComponent(table, value,
                    isSelected, hasFocus, row, column);

            if (c instanceof JLabel) {
                JLabel l = (JLabel) c;

                l.setHorizontalTextPosition(JLabel.LEFT);

                int modelColumn = table.convertColumnIndexToModel(column);

                l.setIcon(getHeaderRendererIcon(modelColumn,
                                                l.getFont().getSize()));
            }

            return c;
        }
    }

    private static class Directive {

        private int column;
        private int direction;

        public Directive(int column, int direction) {
            this.column    = column;
            this.direction = direction;
        }
    }
}