Align text in a JTable cell while maintaining JTable default renderer?

Question

I have a JTable that does lovely alternations in coloration thanks to this code:

table.setDefaultRenderer(Object.class, new BorderRenderer(new ColorRenderer(table
                .getDefaultRenderer(Object.class), colorProvider)));

(Here the "colorProvider" contains code that turns every other row light grey.) I have one column in which I would like to align text to center. If I simply set a DefaultCellRenderer on that column with center horizontal alignment, it overrides the table's default renderer and I lose my lovely stripes.

Can I keep the stripes and still change the alignment of a column?

To further complicate things, I have the above code in a super class. It is my sub classes that know what column(s) they would like to change the alignment on.

Answer 1

Thanks both to afk and camickr who led me to my final decision to write a TableCellRendererWrapper:

public class ColumnAlignmentRenderer implements TableCellRenderer {

    private TableCellRenderer mWrappedRenderer;
    private int mDefaultAlignment = SwingConstants.LEFT;
    private Map<Integer, Integer> mSpecialColumnAlignmentMap = new Hashtable<Integer, Integer>();

    public ColumnAlignmentRenderer(TableCellRenderer pWrappedRenderer) {
        mWrappedRenderer = pWrappedRenderer;
    }

    public Component getTableCellRendererComponent(JTable pTable, Object pValue, boolean pIsSelected,
            boolean pHasFocus, int pRow, int pColumn) {

        // Use the wrapped renderer
        Component renderedComponent = mWrappedRenderer.getTableCellRendererComponent(pTable, pValue, pIsSelected, pHasFocus,
                pRow, pColumn);

        // Set the alignment
        Integer alignment = mSpecialColumnAlignmentMap.get(pColumn);
        if (alignment != null) {
            ((JLabel)renderedComponent).setHorizontalAlignment(alignment);
        } else {
            ((JLabel)renderedComponent).setHorizontalAlignment(mDefaultAlignment);
        }

        return renderedComponent;
    }

    public void setSpecialColumnAlignment(Integer pColumn, Integer pAlignment) {
        mSpecialColumnAlignmentMap.put(pColumn, pAlignment);
    }

    public void setDefaultAlignment(int pAlignment) {
        mDefaultAlignment = pAlignment;
    }
}

It's not perfect, but it gets the job done for me. To use it I do this:

        // Center alignment for "selected" column
        ColumnAlignmentRenderer cellRenderer = new ColumnAlignmentRenderer(getTable().getDefaultRenderer(Object.class));
        cellRenderer.setSpecialColumnAlignment(MyTableModel.COL_TO_CENTER, SwingConstants.CENTER);
        getTable().setDefaultRenderer(Object.class, cellRenderer);

        // Center alignmet for "selected" column header
        ColumnAlignmentRenderer headerRenderer = new ColumnAlignmentRenderer(getTable().getTableHeader().getDefaultRenderer());
        headerRenderer.setSpecialColumnAlignment(MyTableModel.COL_TO_CENTER, SwingConstants.CENTER);
        getTable().getTableHeader().setDefaultRenderer(headerRenderer);