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 * Copyright (c) 1997, 2016, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.  Oracle designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Oracle in the LICENSE file that accompanied this code.
 *
 * This code 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
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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package javax.swing.table;

import sun.swing.table.DefaultTableCellHeaderRenderer;

import java.util.*;
import java.awt.*;
import java.awt.event.*;

import javax.swing.*;
import javax.swing.event.*;
import javax.swing.plaf.*;
import javax.accessibility.*;

import java.beans.BeanProperty;
import java.beans.PropertyChangeListener;
import java.beans.Transient;

import java.io.ObjectOutputStream;
import java.io.IOException;

import sun.awt.AWTAccessor;
import sun.awt.AWTAccessor.MouseEventAccessor;

This is the object which manages the header of the JTable.

Warning:
Serialized objects of this class will not be compatible with
future Swing releases. The current serialization support is
appropriate for short term storage or RMI between applications running
the same version of Swing.  As of 1.4, support for long term storage
of all JavaBeans™
has been added to the java.beans package. Please see XMLEncoder. 
Author:
Alan Chung, Philip Milne
See Also:
JTable/**
 * This is the object which manages the header of the <code>JTable</code>.
 * <p>
 * <strong>Warning:</strong>
 * Serialized objects of this class will not be compatible with
 * future Swing releases. The current serialization support is
 * appropriate for short term storage or RMI between applications running
 * the same version of Swing.  As of 1.4, support for long term storage
 * of all JavaBeans&trade;
 * has been added to the <code>java.beans</code> package.
 * Please see {@link java.beans.XMLEncoder}.
 *
 * @author Alan Chung
 * @author Philip Milne
 * @see javax.swing.JTable
 */
@SuppressWarnings("serial") // Same-version serialization only
public class JTableHeader extends JComponent implements TableColumnModelListener, Accessible
{
    
See Also:
getUIClassID
JComponent.readObject/**
     * @see #getUIClassID
     * @see #readObject
     */
    private static final String uiClassID = "TableHeaderUI";

//
// Instance Variables
//
    
The table for which this object is the header;
the default is null.
/**
     * The table for which this object is the header;
     * the default is <code>null</code>.
     */
    protected JTable table;

    
The TableColumnModel of the table header.
/**
     * The <code>TableColumnModel</code> of the table header.
     */
    protected TableColumnModel  columnModel;

    
If true, reordering of columns are allowed by the user;
the default is true.
/**
     * If true, reordering of columns are allowed by the user;
     * the default is true.
     */
    protected boolean   reorderingAllowed;

    
If true, resizing of columns are allowed by the user;
the default is true.
/**
     * If true, resizing of columns are allowed by the user;
     * the default is true.
     */
    protected boolean   resizingAllowed;

    
Obsolete as of Java 2 platform v1.3.  Real time repaints, in response
to column dragging or resizing, are now unconditional.
/**
     * Obsolete as of Java 2 platform v1.3.  Real time repaints, in response
     * to column dragging or resizing, are now unconditional.
     */
    /*
     * If this flag is true, then the header will repaint the table as
     * a column is dragged or resized; the default is true.
     */
    protected boolean   updateTableInRealTime;

    
The index of the column being resized. null if not resizing. /** The index of the column being resized. <code>null</code> if not resizing. */
    protected transient TableColumn     resizingColumn;

    
The index of the column being dragged. null if not dragging. /** The index of the column being dragged. <code>null</code> if not dragging. */
    protected transient TableColumn     draggedColumn;

    
The distance from its original position the column has been dragged. /** The distance from its original position the column has been dragged. */
    protected transient int     draggedDistance;

    
 The default renderer to be used when a TableColumn
 does not define a headerRenderer.
/**
      *  The default renderer to be used when a <code>TableColumn</code>
      *  does not define a <code>headerRenderer</code>.
      */
    private TableCellRenderer defaultRenderer;

    
Flag to indicate UI update is in progress
/**
     * Flag to indicate UI update is in progress
     */
    private transient boolean updateInProgress;

//
// Constructors
//

    
 Constructs a JTableHeader with a default
 TableColumnModel.
See Also:
createDefaultColumnModel/**
     *  Constructs a <code>JTableHeader</code> with a default
     *  <code>TableColumnModel</code>.
     *
     * @see #createDefaultColumnModel
     */
    public JTableHeader() {
        this(null);
    }

    
 Constructs a JTableHeader which is initialized with
 cm as the column model.  If cm is
 null this method will initialize the table header
 with a default TableColumnModel.
Params:
cm –        the column model for the table
See Also:
createDefaultColumnModel/**
     *  Constructs a <code>JTableHeader</code> which is initialized with
     *  <code>cm</code> as the column model.  If <code>cm</code> is
     *  <code>null</code> this method will initialize the table header
     *  with a default <code>TableColumnModel</code>.
     *
     * @param cm        the column model for the table
     * @see #createDefaultColumnModel
     */
    public JTableHeader(TableColumnModel cm) {
        super();

        //setFocusable(false); // for strict win/mac compatibility mode,
                               // this method should be invoked

        if (cm == null)
            cm = createDefaultColumnModel();
        setColumnModel(cm);

        // Initialize local ivars
        initializeLocalVars();

        // Get UI going
        updateUI();
    }

//
// Local behavior attributes
//

    
 Sets the table associated with this header.
 @param  table   the new table
/**
     *  Sets the table associated with this header.
     *  @param  table   the new table
     */
    @BeanProperty(description
            = "The table associated with this header.")
    public void setTable(JTable table) {
        JTable old = this.table;
        this.table = table;
        firePropertyChange("table", old, table);
    }

    
 Returns the table associated with this header.
 @return  the table property
/**
      *  Returns the table associated with this header.
      *  @return  the <code>table</code> property
      */
    public JTable getTable() {
        return table;
    }

    
 Sets whether the user can drag column headers to reorder columns.
Params:
reorderingAllowed –       true if the table view should allow
                                 reordering; otherwise false
See Also:
getReorderingAllowed/**
     *  Sets whether the user can drag column headers to reorder columns.
     *
     * @param   reorderingAllowed       true if the table view should allow
     *                                  reordering; otherwise false
     * @see     #getReorderingAllowed
     */
    @BeanProperty(description
            = "Whether the user can drag column headers to reorder columns.")
    public void setReorderingAllowed(boolean reorderingAllowed) {
        boolean old = this.reorderingAllowed;
        this.reorderingAllowed = reorderingAllowed;
        firePropertyChange("reorderingAllowed", old, reorderingAllowed);
    }

    
Returns true if the user is allowed to rearrange columns by
dragging their headers, false otherwise. The default is true. You can
rearrange columns programmatically regardless of this setting.
See Also:
setReorderingAllowed
Returns:
 the reorderingAllowed property/**
     * Returns true if the user is allowed to rearrange columns by
     * dragging their headers, false otherwise. The default is true. You can
     * rearrange columns programmatically regardless of this setting.
     *
     * @return  the <code>reorderingAllowed</code> property
     * @see     #setReorderingAllowed
     */
    public boolean getReorderingAllowed() {
        return reorderingAllowed;
    }

    
 Sets whether the user can resize columns by dragging between headers.
Params:
resizingAllowed –         true if table view should allow
                                 resizing
See Also:
getResizingAllowed/**
     *  Sets whether the user can resize columns by dragging between headers.
     *
     * @param   resizingAllowed         true if table view should allow
     *                                  resizing
     * @see     #getResizingAllowed
     */
    @BeanProperty(description
            = "Whether the user can resize columns by dragging between headers.")
    public void setResizingAllowed(boolean resizingAllowed) {
        boolean old = this.resizingAllowed;
        this.resizingAllowed = resizingAllowed;
        firePropertyChange("resizingAllowed", old, resizingAllowed);
    }

    
Returns true if the user is allowed to resize columns by dragging
between their headers, false otherwise. The default is true. You can
resize columns programmatically regardless of this setting.
See Also:
setResizingAllowed
Returns:
 the resizingAllowed property/**
     * Returns true if the user is allowed to resize columns by dragging
     * between their headers, false otherwise. The default is true. You can
     * resize columns programmatically regardless of this setting.
     *
     * @return  the <code>resizingAllowed</code> property
     * @see     #setResizingAllowed
     */
    public boolean getResizingAllowed() {
        return resizingAllowed;
    }

    
Returns the dragged column, if and only if, a drag is in
process, otherwise returns null.
See Also:
getDraggedDistance
Returns:
 the dragged column, if a drag is in
         process, otherwise returns null/**
     * Returns the dragged column, if and only if, a drag is in
     * process, otherwise returns <code>null</code>.
     *
     * @return  the dragged column, if a drag is in
     *          process, otherwise returns <code>null</code>
     * @see     #getDraggedDistance
     */
    public TableColumn getDraggedColumn() {
        return draggedColumn;
    }

    
Returns the column's horizontal distance from its original
position, if and only if, a drag is in process. Otherwise, the
the return value is meaningless.
See Also:
getDraggedColumn
Returns:
 the column's horizontal distance from its original
         position, if a drag is in process, otherwise the return
         value is meaningless/**
     * Returns the column's horizontal distance from its original
     * position, if and only if, a drag is in process. Otherwise, the
     * the return value is meaningless.
     *
     * @return  the column's horizontal distance from its original
     *          position, if a drag is in process, otherwise the return
     *          value is meaningless
     * @see     #getDraggedColumn
     */
    public int getDraggedDistance() {
        return draggedDistance;
    }

    
Returns the resizing column.  If no column is being
resized this method returns null.
Returns:
 the resizing column, if a resize is in process, otherwise
         returns null/**
     * Returns the resizing column.  If no column is being
     * resized this method returns <code>null</code>.
     *
     * @return  the resizing column, if a resize is in process, otherwise
     *          returns <code>null</code>
     */
    public TableColumn getResizingColumn() {
        return resizingColumn;
    }

    
Obsolete as of Java 2 platform v1.3.  Real time repaints, in response to
column dragging or resizing, are now unconditional.
Params:
flag – true if tableView should update the body of the
table in real time/**
     * Obsolete as of Java 2 platform v1.3.  Real time repaints, in response to
     * column dragging or resizing, are now unconditional.
     * @param flag true if tableView should update the body of the
     * table in real time
     */
    public void setUpdateTableInRealTime(boolean flag) {
        updateTableInRealTime = flag;
    }

    
Obsolete as of Java 2 platform v1.3.  Real time repaints, in response to
column dragging or resizing, are now unconditional.
Returns:
 true if the table updates in real time/**
     * Obsolete as of Java 2 platform v1.3.  Real time repaints, in response to
     * column dragging or resizing, are now unconditional.
     * @return  true if the table updates in real time
     */
    public boolean getUpdateTableInRealTime() {
        return updateTableInRealTime;
    }

    
Sets the default renderer to be used when no headerRenderer
is defined by a TableColumn.
Params:
defaultRenderer –  the default renderer
Since:
1.3/**
     * Sets the default renderer to be used when no <code>headerRenderer</code>
     * is defined by a <code>TableColumn</code>.
     * @param  defaultRenderer  the default renderer
     * @since 1.3
     */
    public void setDefaultRenderer(TableCellRenderer defaultRenderer) {
        this.defaultRenderer = defaultRenderer;
    }

    
Returns the default renderer used when no headerRenderer
is defined by a TableColumn.
Returns:
the default renderer
Since:
1.3/**
     * Returns the default renderer used when no <code>headerRenderer</code>
     * is defined by a <code>TableColumn</code>.
     * @return the default renderer
     * @since 1.3
     */
    @Transient
    public TableCellRenderer getDefaultRenderer() {
        return defaultRenderer;
    }

    
Returns the index of the column that point lies in, or -1 if it
lies out of bounds.
Params:
point –  if this point lies within a column, the index of
              that column will be returned; otherwise it is out of bounds
              and -1 is returned
Returns:
 the index of the column that point lies in, or -1 if it
         lies out of bounds/**
     * Returns the index of the column that <code>point</code> lies in, or -1 if it
     * lies out of bounds.
     *
     * @param point  if this <code>point</code> lies within a column, the index of
     *               that column will be returned; otherwise it is out of bounds
     *               and -1 is returned
     *
     * @return  the index of the column that <code>point</code> lies in, or -1 if it
     *          lies out of bounds
     */
    public int columnAtPoint(Point point) {
        int x = point.x;
        if (!getComponentOrientation().isLeftToRight()) {
            x = getWidthInRightToLeft() - x - 1;
        }
        return getColumnModel().getColumnIndexAtX(x);
    }

    
Returns the rectangle containing the header tile at column.
When the column parameter is out of bounds this method uses the
same conventions as the JTable method getCellRect.
Params:
column –  index of the column
See Also:
JTable.getCellRect
Returns:
 the rectangle containing the header tile at column/**
     * Returns the rectangle containing the header tile at <code>column</code>.
     * When the <code>column</code> parameter is out of bounds this method uses the
     * same conventions as the <code>JTable</code> method <code>getCellRect</code>.
     *
     * @param column  index of the column
     *
     * @return  the rectangle containing the header tile at <code>column</code>
     * @see JTable#getCellRect
     */
    public Rectangle getHeaderRect(int column) {
        Rectangle r = new Rectangle();
        TableColumnModel cm = getColumnModel();

        r.height = getHeight();

        if (column < 0) {
            // x = width = 0;
            if( !getComponentOrientation().isLeftToRight() ) {
                r.x = getWidthInRightToLeft();
            }
        }
        else if (column >= cm.getColumnCount()) {
            if( getComponentOrientation().isLeftToRight() ) {
                r.x = getWidth();
            }
        }
        else {
            for(int i = 0; i < column; i++) {
                r.x += cm.getColumn(i).getWidth();
            }
            if( !getComponentOrientation().isLeftToRight() ) {
                r.x = getWidthInRightToLeft() - r.x - cm.getColumn(column).getWidth();
            }

            r.width = cm.getColumn(column).getWidth();
        }
        return r;
    }


    
Allows the renderer's tips to be used if there is text set.
Params:
event –  the location of the event identifies the proper
                         renderer and, therefore, the proper tip
Returns:
the tool tip for this component/**
     * Allows the renderer's tips to be used if there is text set.
     * @param  event  the location of the event identifies the proper
     *                          renderer and, therefore, the proper tip
     * @return the tool tip for this component
     */
    @SuppressWarnings("deprecation")
    public String getToolTipText(MouseEvent event) {
        String tip = null;
        Point p = event.getPoint();
        int column;

        // Locate the renderer under the event location
        if ((column = columnAtPoint(p)) != -1) {
            TableColumn aColumn = columnModel.getColumn(column);
            TableCellRenderer renderer = aColumn.getHeaderRenderer();
            if (renderer == null) {
                renderer = defaultRenderer;
            }
            Component component = renderer.getTableCellRendererComponent(
                              getTable(), aColumn.getHeaderValue(), false, false,
                              -1, column);

            // Now have to see if the component is a JComponent before
            // getting the tip
            if (component instanceof JComponent) {
                // Convert the event to the renderer's coordinate system
                MouseEvent newEvent;
                Rectangle cellRect = getHeaderRect(column);

                p.translate(-cellRect.x, -cellRect.y);
                newEvent = new MouseEvent(component, event.getID(),
                                          event.getWhen(), event.getModifiers(),
                                          p.x, p.y, event.getXOnScreen(), event.getYOnScreen(),
                                          event.getClickCount(),
                                          event.isPopupTrigger(), MouseEvent.NOBUTTON);
                MouseEventAccessor meAccessor = AWTAccessor.getMouseEventAccessor();
                meAccessor.setCausedByTouchEvent(newEvent,
                    meAccessor.isCausedByTouchEvent(event));

                tip = ((JComponent)component).getToolTipText(newEvent);
            }
        }

        // No tip from the renderer get our own tip
        if (tip == null)
            tip = getToolTipText();

        return tip;
    }

    
Returns the preferred size of the table header. This is the size required to display the header and requested for the viewport. The returned Dimension width will always be calculated by the underlying TableHeaderUI, regardless of any width specified by JComponent.setPreferredSize(Dimension) 
Returns:
the size/**
     * Returns the preferred size of the table header.
     * This is the size required to display the header and requested for
     * the viewport.
     * The returned {@code Dimension} {@code width} will always be calculated by
     * the underlying TableHeaderUI, regardless of any width specified by
     * {@link JComponent#setPreferredSize(java.awt.Dimension)}
     *
     * @return the size
     */
    @Override
    public Dimension getPreferredSize() {
        Dimension preferredSize = super.getPreferredSize();
        if (isPreferredSizeSet() && ui != null) {
            Dimension size = ui.getPreferredSize(this);
            if (size != null) preferredSize.width = size.width;
        }
        return preferredSize;
    }

//
// Managing TableHeaderUI
//

    
Returns the look and feel (L&F) object that renders this component.
Returns:
the TableHeaderUI object that renders this component/**
     * Returns the look and feel (L&amp;F) object that renders this component.
     *
     * @return the <code>TableHeaderUI</code> object that renders this component
     */
    public TableHeaderUI getUI() {
        return (TableHeaderUI)ui;
    }

    
Sets the look and feel (L&F) object that renders this component.
Params:
ui –  the TableHeaderUI L&F object
See Also:
UIDefaults.getUI/**
     * Sets the look and feel (L&amp;F) object that renders this component.
     *
     * @param ui  the <code>TableHeaderUI</code> L&amp;F object
     * @see UIDefaults#getUI
     */
    public void setUI(TableHeaderUI ui){
        if (this.ui != ui) {
            super.setUI(ui);
            repaint();
        }
    }

    
Notification from the UIManager that the look and feel
(L&F) has changed.
Replaces the current UI object with the latest version from the
UIManager.
See Also:
updateUI.updateUI/**
     * Notification from the <code>UIManager</code> that the look and feel
     * (L&amp;F) has changed.
     * Replaces the current UI object with the latest version from the
     * <code>UIManager</code>.
     *
     * @see JComponent#updateUI
     */
    public void updateUI(){
        if (!updateInProgress) {
            updateInProgress = true;
            try {
                setUI((TableHeaderUI)UIManager.getUI(this));

                TableCellRenderer renderer = getDefaultRenderer();
                if (renderer instanceof Component) {
                    SwingUtilities.updateComponentTreeUI((Component)renderer);
                }
            } finally {
                updateInProgress = false;
            }
        }
    }


    
Returns the suffix used to construct the name of the look and feel
(L&F) class used to render this component.
See Also:
JComponent.getUIClassID
UIDefaults.getUI
Returns:
the string "TableHeaderUI"
Returns:
"TableHeaderUI"/**
     * Returns the suffix used to construct the name of the look and feel
     * (L&amp;F) class used to render this component.
     * @return the string "TableHeaderUI"
     *
     * @return "TableHeaderUI"
     * @see JComponent#getUIClassID
     * @see UIDefaults#getUI
     */
    public String getUIClassID() {
        return uiClassID;
    }


//
// Managing models
//


    
 Sets the column model for this table to newModel and registers
 for listener notifications from the new column model.
Params:
columnModel –     the new data source for this table
Throws:
IllegalArgumentException – 
                         if newModel is null
See Also:
getColumnModel/**
     *  Sets the column model for this table to <code>newModel</code> and registers
     *  for listener notifications from the new column model.
     *
     * @param   columnModel     the new data source for this table
     * @exception IllegalArgumentException
     *                          if <code>newModel</code> is <code>null</code>
     * @see     #getColumnModel
     */
    @BeanProperty(description
            = "The object governing the way columns appear in the view.")
    public void setColumnModel(TableColumnModel columnModel) {
        if (columnModel == null) {
            throw new IllegalArgumentException("Cannot set a null ColumnModel");
        }
        TableColumnModel old = this.columnModel;
        if (columnModel != old) {
            if (old != null) {
                old.removeColumnModelListener(this);
            }
            this.columnModel = columnModel;
            columnModel.addColumnModelListener(this);

            firePropertyChange("columnModel", old, columnModel);
            resizeAndRepaint();
        }
    }

    
Returns the TableColumnModel that contains all column information
of this table header.
See Also:
setColumnModel
Returns:
 the columnModel property/**
     * Returns the <code>TableColumnModel</code> that contains all column information
     * of this table header.
     *
     * @return  the <code>columnModel</code> property
     * @see     #setColumnModel
     */
    public TableColumnModel getColumnModel() {
        return columnModel;
    }

//
// Implementing TableColumnModelListener interface
//

    
Invoked when a column is added to the table column model.

Application code will not use these methods explicitly, they
are used internally by JTable.
Params:
e –  the event received
See Also:
TableColumnModelListener/**
     * Invoked when a column is added to the table column model.
     * <p>
     * Application code will not use these methods explicitly, they
     * are used internally by <code>JTable</code>.
     *
     * @param e  the event received
     * @see TableColumnModelListener
     */
    public void columnAdded(TableColumnModelEvent e) { resizeAndRepaint(); }


    
Invoked when a column is removed from the table column model.

Application code will not use these methods explicitly, they
are used internally by JTable.
Params:
e –  the event received
See Also:
TableColumnModelListener/**
     * Invoked when a column is removed from the table column model.
     * <p>
     * Application code will not use these methods explicitly, they
     * are used internally by <code>JTable</code>.
     *
     * @param e  the event received
     * @see TableColumnModelListener
     */
    public void columnRemoved(TableColumnModelEvent e) { resizeAndRepaint(); }


    
Invoked when a column is repositioned.

Application code will not use these methods explicitly, they
are used internally by JTable.
Params:
e – the event received
See Also:
TableColumnModelListener/**
     * Invoked when a column is repositioned.
     * <p>
     * Application code will not use these methods explicitly, they
     * are used internally by <code>JTable</code>.
     *
     * @param e the event received
     * @see TableColumnModelListener
     */
    public void columnMoved(TableColumnModelEvent e) { repaint(); }


    
Invoked when a column is moved due to a margin change.

Application code will not use these methods explicitly, they
are used internally by JTable.
Params:
e – the event received
See Also:
TableColumnModelListener/**
     * Invoked when a column is moved due to a margin change.
     * <p>
     * Application code will not use these methods explicitly, they
     * are used internally by <code>JTable</code>.
     *
     * @param e the event received
     * @see TableColumnModelListener
     */
    public void columnMarginChanged(ChangeEvent e) { resizeAndRepaint(); }


    // --Redrawing the header is slow in cell selection mode.
    // --Since header selection is ugly and it is always clear from the
    // --view which columns are selected, don't redraw the header.
    
Invoked when the selection model of the TableColumnModel
is changed.  This method currently has no effect (the header is not
redrawn).

Application code will not use these methods explicitly, they
are used internally by JTable.
Params:
e – the event received
See Also:
TableColumnModelListener/**
     * Invoked when the selection model of the <code>TableColumnModel</code>
     * is changed.  This method currently has no effect (the header is not
     * redrawn).
     * <p>
     * Application code will not use these methods explicitly, they
     * are used internally by <code>JTable</code>.
     *
     * @param e the event received
     * @see TableColumnModelListener
     */
    public void columnSelectionChanged(ListSelectionEvent e) { } // repaint(); }

//
//  Package Methods
//

    
 Returns the default column model object which is
 a DefaultTableColumnModel.  A subclass can override this
 method to return a different column model object
Returns:
the default column model object/**
     *  Returns the default column model object which is
     *  a <code>DefaultTableColumnModel</code>.  A subclass can override this
     *  method to return a different column model object
     *
     * @return the default column model object
     */
    protected TableColumnModel createDefaultColumnModel() {
        return new DefaultTableColumnModel();
    }

    
 Returns a default renderer to be used when no header renderer
 is defined by a TableColumn.
 @return the default table column renderer
Since:
1.3/**
     *  Returns a default renderer to be used when no header renderer
     *  is defined by a <code>TableColumn</code>.
     *
     *  @return the default table column renderer
     * @since 1.3
     */
    protected TableCellRenderer createDefaultRenderer() {
        return new DefaultTableCellHeaderRenderer();
    }


    
Initializes the local variables and properties with default values.
Used by the constructor methods.
/**
     * Initializes the local variables and properties with default values.
     * Used by the constructor methods.
     */
    protected void initializeLocalVars() {
        setOpaque(true);
        table = null;
        reorderingAllowed = true;
        resizingAllowed = true;
        draggedColumn = null;
        draggedDistance = 0;
        resizingColumn = null;
        updateTableInRealTime = true;

        // I'm registered to do tool tips so we can draw tips for the
        // renderers
        ToolTipManager toolTipManager = ToolTipManager.sharedInstance();
        toolTipManager.registerComponent(this);
        setDefaultRenderer(createDefaultRenderer());
    }

    
Sizes the header and marks it as needing display.  Equivalent
to revalidate followed by repaint.
/**
     * Sizes the header and marks it as needing display.  Equivalent
     * to <code>revalidate</code> followed by <code>repaint</code>.
     */
    public void resizeAndRepaint() {
        revalidate();
        repaint();
    }

    
 Sets the header's draggedColumn to aColumn.
 

 Application code will not use this method explicitly, it is used
 internally by the column dragging mechanism.
 @param  aColumn  the column being dragged, or null if
                no column is being dragged
/**
      *  Sets the header's <code>draggedColumn</code> to <code>aColumn</code>.
      *  <p>
      *  Application code will not use this method explicitly, it is used
      *  internally by the column dragging mechanism.
      *
      *  @param  aColumn  the column being dragged, or <code>null</code> if
      *                 no column is being dragged
      */
    public void setDraggedColumn(TableColumn aColumn) {
        draggedColumn = aColumn;
    }

    
 Sets the header's draggedDistance to distance.
 @param distance  the distance dragged
/**
      *  Sets the header's <code>draggedDistance</code> to <code>distance</code>.
      *  @param distance  the distance dragged
      */
    public void setDraggedDistance(int distance) {
        draggedDistance = distance;
    }

    
 Sets the header's resizingColumn to aColumn.
 

 Application code will not use this method explicitly, it
 is used internally by the column sizing mechanism.
 @param  aColumn  the column being resized, or null if
                no column is being resized
/**
      *  Sets the header's <code>resizingColumn</code> to <code>aColumn</code>.
      *  <p>
      *  Application code will not use this method explicitly, it
      *  is used internally by the column sizing mechanism.
      *
      *  @param  aColumn  the column being resized, or <code>null</code> if
      *                 no column is being resized
      */
    public void setResizingColumn(TableColumn aColumn) {
        resizingColumn = aColumn;
    }

    
See readObject and writeObject in
JComponent for more
information about serialization in Swing.
/**
     * See <code>readObject</code> and <code>writeObject</code> in
     * <code>JComponent</code> for more
     * information about serialization in Swing.
     */
    private void writeObject(ObjectOutputStream s) throws IOException {
        s.defaultWriteObject();
        if ((ui != null) && (getUIClassID().equals(uiClassID))) {
            ui.installUI(this);
        }
    }

    private int getWidthInRightToLeft() {
        if ((table != null) &&
            (table.getAutoResizeMode() != JTable.AUTO_RESIZE_OFF)) {
            return table.getWidth();
        }
        return super.getWidth();
    }

    
Returns a string representation of this JTableHeader. This method
is intended to be used only for debugging purposes, and the
content and format of the returned string may vary between
implementations. The returned string may be empty but may not
be null.

Overriding paramString to provide information about the
specific new aspects of the JFC components.
Returns:
 a string representation of this JTableHeader/**
     * Returns a string representation of this <code>JTableHeader</code>. This method
     * is intended to be used only for debugging purposes, and the
     * content and format of the returned string may vary between
     * implementations. The returned string may be empty but may not
     * be <code>null</code>.
     * <P>
     * Overriding <code>paramString</code> to provide information about the
     * specific new aspects of the JFC components.
     *
     * @return  a string representation of this <code>JTableHeader</code>
     */
    protected String paramString() {
        String reorderingAllowedString = (reorderingAllowed ?
                                          "true" : "false");
        String resizingAllowedString = (resizingAllowed ?
                                        "true" : "false");
        String updateTableInRealTimeString = (updateTableInRealTime ?
                                              "true" : "false");

        return super.paramString() +
        ",draggedDistance=" + draggedDistance +
        ",reorderingAllowed=" + reorderingAllowedString +
        ",resizingAllowed=" + resizingAllowedString +
        ",updateTableInRealTime=" + updateTableInRealTimeString;
    }

/////////////////
// Accessibility support
////////////////

    
Gets the AccessibleContext associated with this JTableHeader.
For JTableHeaders, the AccessibleContext takes the form of an
AccessibleJTableHeader.
A new AccessibleJTableHeader instance is created if necessary.
Returns:
an AccessibleJTableHeader that serves as the
        AccessibleContext of this JTableHeader/**
     * Gets the AccessibleContext associated with this JTableHeader.
     * For JTableHeaders, the AccessibleContext takes the form of an
     * AccessibleJTableHeader.
     * A new AccessibleJTableHeader instance is created if necessary.
     *
     * @return an AccessibleJTableHeader that serves as the
     *         AccessibleContext of this JTableHeader
     */
    public AccessibleContext getAccessibleContext() {
        if (accessibleContext == null) {
            accessibleContext = new AccessibleJTableHeader();
        }
        return accessibleContext;
    }

    //
    // *** should also implement AccessibleSelection?
    // *** and what's up with keyboard navigation/manipulation?
    //
    
This class implements accessibility support for the
JTableHeader class.  It provides an implementation of the
Java Accessibility API appropriate to table header user-interface
elements.

Warning:
Serialized objects of this class will not be compatible with
future Swing releases. The current serialization support is
appropriate for short term storage or RMI between applications running
the same version of Swing.  As of 1.4, support for long term storage
of all JavaBeans™
has been added to the java.beans package. Please see XMLEncoder. /**
     * This class implements accessibility support for the
     * <code>JTableHeader</code> class.  It provides an implementation of the
     * Java Accessibility API appropriate to table header user-interface
     * elements.
     * <p>
     * <strong>Warning:</strong>
     * Serialized objects of this class will not be compatible with
     * future Swing releases. The current serialization support is
     * appropriate for short term storage or RMI between applications running
     * the same version of Swing.  As of 1.4, support for long term storage
     * of all JavaBeans&trade;
     * has been added to the <code>java.beans</code> package.
     * Please see {@link java.beans.XMLEncoder}.
     */
    @SuppressWarnings("serial") // Same-version serialization only
    protected class AccessibleJTableHeader extends AccessibleJComponent {

        
Get the role of this object.
See Also:
AccessibleRole
Returns:
an instance of AccessibleRole describing the role of the
object/**
         * Get the role of this object.
         *
         * @return an instance of AccessibleRole describing the role of the
         * object
         * @see AccessibleRole
         */
        public AccessibleRole getAccessibleRole() {
            return AccessibleRole.PANEL;
        }

        
Returns the Accessible child, if one exists, contained at the local
coordinate Point.
Params:
p – The point defining the top-left corner of the Accessible,
given in the coordinate space of the object's parent.
Returns:
the Accessible, if it exists, at the specified location;
else null/**
         * Returns the Accessible child, if one exists, contained at the local
         * coordinate Point.
         *
         * @param p The point defining the top-left corner of the Accessible,
         * given in the coordinate space of the object's parent.
         * @return the Accessible, if it exists, at the specified location;
         * else null
         */
        public Accessible getAccessibleAt(Point p) {
            int column;

            // Locate the renderer under the Point
            if ((column = JTableHeader.this.columnAtPoint(p)) != -1) {
                TableColumn aColumn = JTableHeader.this.columnModel.getColumn(column);
                TableCellRenderer renderer = aColumn.getHeaderRenderer();
                if (renderer == null) {
                    if (defaultRenderer != null) {
                        renderer = defaultRenderer;
                    } else {
                        return null;
                    }
                }
                Component component = renderer.getTableCellRendererComponent(
                                  JTableHeader.this.getTable(),
                                  aColumn.getHeaderValue(), false, false,
                                  -1, column);

                return new AccessibleJTableHeaderEntry(column, JTableHeader.this, JTableHeader.this.table);
            } else {
                return null;
            }
        }

        
Returns the number of accessible children in the object.  If all
of the children of this object implement Accessible, than this
method should return the number of children of this object.
Returns:
the number of accessible children in the object./**
         * Returns the number of accessible children in the object.  If all
         * of the children of this object implement Accessible, than this
         * method should return the number of children of this object.
         *
         * @return the number of accessible children in the object.
         */
        public int getAccessibleChildrenCount() {
            return JTableHeader.this.columnModel.getColumnCount();
        }

        
Return the nth Accessible child of the object.
Params:
i – zero-based index of child
Returns:
the nth Accessible child of the object/**
         * Return the nth Accessible child of the object.
         *
         * @param i zero-based index of child
         * @return the nth Accessible child of the object
         */
        public Accessible getAccessibleChild(int i) {
            if (i < 0 || i >= getAccessibleChildrenCount()) {
                return null;
            } else {
                TableColumn aColumn = JTableHeader.this.columnModel.getColumn(i)
;
                TableCellRenderer renderer = aColumn.getHeaderRenderer();
                if (renderer == null) {
                    if (defaultRenderer != null) {
                        renderer = defaultRenderer;
                    } else {
                        return null;
                    }
                }
                Component component = renderer.getTableCellRendererComponent(
                                  JTableHeader.this.getTable(),
                                  aColumn.getHeaderValue(), false, false,
                                  -1, i);

                return new AccessibleJTableHeaderEntry(i, JTableHeader.this, JTableHeader.this.table);
            }
        }

      
This class provides an implementation of the Java Accessibility
API appropriate for JTableHeader entries.
/**
       * This class provides an implementation of the Java Accessibility
       * API appropriate for JTableHeader entries.
       */
        protected class AccessibleJTableHeaderEntry extends AccessibleContext
            implements Accessible, AccessibleComponent  {

            private JTableHeader parent;
            private int column;
            private JTable table;

            
 Constructs an AccessiblJTableHeaaderEntry
Params:
c –  the column index
p –  the parent JTableHeader
t –  the table JTable
Since:
1.4/**
             *  Constructs an AccessiblJTableHeaaderEntry
             * @since 1.4
             *
             * @param c  the column index
             * @param p  the parent <code>JTableHeader</code>
             * @param t  the table <code>JTable</code>
             */
            public AccessibleJTableHeaderEntry(int c, JTableHeader p, JTable t) {
                parent = p;
                column = c;
                table = t;
                this.setAccessibleParent(parent);
            }

            
Get the AccessibleContext associated with this object.
In the implementation of the Java Accessibility API
for this class, returns this object, which serves as
its own AccessibleContext.
Returns:
this object/**
             * Get the AccessibleContext associated with this object.
             * In the implementation of the Java Accessibility API
             * for this class, returns this object, which serves as
             * its own AccessibleContext.
             *
             * @return this object
             */
            public AccessibleContext getAccessibleContext() {
                return this;
            }

            private AccessibleContext getCurrentAccessibleContext() {
                TableColumnModel tcm = table.getColumnModel();
                if (tcm != null) {
                    // Fixes 4772355 - ArrayOutOfBoundsException in
                    // JTableHeader
                    if (column < 0 || column >= tcm.getColumnCount()) {
                        return null;
                    }
                    TableColumn aColumn = tcm.getColumn(column);
                    TableCellRenderer renderer = aColumn.getHeaderRenderer();
                    if (renderer == null) {
                        if (defaultRenderer != null) {
                            renderer = defaultRenderer;
                        } else {
                            return null;
                        }
                    }
                    Component c = renderer.getTableCellRendererComponent(
                                      JTableHeader.this.getTable(),
                                      aColumn.getHeaderValue(), false, false,
                                      -1, column);
                    if (c instanceof Accessible) {
                        return ((Accessible) c).getAccessibleContext();
                    }
                }
                return null;
            }

            private Component getCurrentComponent() {
                TableColumnModel tcm = table.getColumnModel();
                if (tcm != null) {
                    // Fixes 4772355 - ArrayOutOfBoundsException in
                    // JTableHeader
                    if (column < 0 || column >= tcm.getColumnCount()) {
                        return null;
                    }
                    TableColumn aColumn = tcm.getColumn(column);
                    TableCellRenderer renderer = aColumn.getHeaderRenderer();
                    if (renderer == null) {
                        if (defaultRenderer != null) {
                            renderer = defaultRenderer;
                        } else {
                            return null;
                        }
                    }
                    return renderer.getTableCellRendererComponent(
                                      JTableHeader.this.getTable(),
                                      aColumn.getHeaderValue(), false, false,
                                      -1, column);
                } else {
                    return null;
                }
            }

        // AccessibleContext methods

            public String getAccessibleName() {
                AccessibleContext ac = getCurrentAccessibleContext();
                if (ac != null) {
                    String name = ac.getAccessibleName();
                    if ((name != null) && (name != "")) {
                        // return the cell renderer's AccessibleName
                        return name;
                    }
                }
                if ((accessibleName != null) && (accessibleName != "")) {
                    return accessibleName;
                } else {
                    // fall back to the client property
                    String name = (String)getClientProperty(AccessibleContext.ACCESSIBLE_NAME_PROPERTY);
                    if (name != null) {
                        return name;
                    } else {
                        return table.getColumnName(column);
                    }
                }
            }

            public void setAccessibleName(String s) {
                AccessibleContext ac = getCurrentAccessibleContext();
                if (ac != null) {
                    ac.setAccessibleName(s);
                } else {
                    super.setAccessibleName(s);
                }
            }

            //
            // *** should check toolTip text for desc. (needs MouseEvent)
            //
            public String getAccessibleDescription() {
                AccessibleContext ac = getCurrentAccessibleContext();
                if (ac != null) {
                    return ac.getAccessibleDescription();
                } else {
                    return super.getAccessibleDescription();
                }
            }

            public void setAccessibleDescription(String s) {
                AccessibleContext ac = getCurrentAccessibleContext();
                if (ac != null) {
                    ac.setAccessibleDescription(s);
                } else {
                    super.setAccessibleDescription(s);
                }
            }

            public AccessibleRole getAccessibleRole() {
                AccessibleContext ac = getCurrentAccessibleContext();
                if (ac != null) {
                    return ac.getAccessibleRole();
                } else {
                    return AccessibleRole.COLUMN_HEADER;
                }
            }

            public AccessibleStateSet getAccessibleStateSet() {
                AccessibleContext ac = getCurrentAccessibleContext();
                if (ac != null) {
                    AccessibleStateSet states = ac.getAccessibleStateSet();
                    if (isShowing()) {
                        states.add(AccessibleState.SHOWING);
                    }
                    return states;
                } else {
                    return new AccessibleStateSet();  // must be non null?
                }
            }

            public int getAccessibleIndexInParent() {
                return column;
            }

            public int getAccessibleChildrenCount() {
                AccessibleContext ac = getCurrentAccessibleContext();
                if (ac != null) {
                    return ac.getAccessibleChildrenCount();
                } else {
                    return 0;
                }
            }

            public Accessible getAccessibleChild(int i) {
                AccessibleContext ac = getCurrentAccessibleContext();
                if (ac != null) {
                    Accessible accessibleChild = ac.getAccessibleChild(i);
                    ac.setAccessibleParent(this);
                    return accessibleChild;
                } else {
                    return null;
                }
            }

            public Locale getLocale() {
                AccessibleContext ac = getCurrentAccessibleContext();
                if (ac != null) {
                    return ac.getLocale();
                } else {
                    return null;
                }
            }

            public void addPropertyChangeListener(PropertyChangeListener l) {
                AccessibleContext ac = getCurrentAccessibleContext();
                if (ac != null) {
                    ac.addPropertyChangeListener(l);
                } else {
                    super.addPropertyChangeListener(l);
                }
            }

            public void removePropertyChangeListener(PropertyChangeListener l) {
                AccessibleContext ac = getCurrentAccessibleContext();
                if (ac != null) {
                    ac.removePropertyChangeListener(l);
                } else {
                    super.removePropertyChangeListener(l);
                }
            }

            public AccessibleAction getAccessibleAction() {
                return getCurrentAccessibleContext().getAccessibleAction();
            }

           
Get the AccessibleComponent associated with this object.  In the
implementation of the Java Accessibility API for this class,
return this object, which is responsible for implementing the
AccessibleComponent interface on behalf of itself.
Returns:
this object/**
            * Get the AccessibleComponent associated with this object.  In the
            * implementation of the Java Accessibility API for this class,
            * return this object, which is responsible for implementing the
            * AccessibleComponent interface on behalf of itself.
            *
            * @return this object
            */
            public AccessibleComponent getAccessibleComponent() {
                return this; // to override getBounds()
            }

            public AccessibleSelection getAccessibleSelection() {
                return getCurrentAccessibleContext().getAccessibleSelection();
            }

            public AccessibleText getAccessibleText() {
                return getCurrentAccessibleContext().getAccessibleText();
            }

            public AccessibleValue getAccessibleValue() {
                return getCurrentAccessibleContext().getAccessibleValue();
            }


        // AccessibleComponent methods

            public Color getBackground() {
                AccessibleContext ac = getCurrentAccessibleContext();
                if (ac instanceof AccessibleComponent) {
                    return ((AccessibleComponent) ac).getBackground();
                } else {
                    Component c = getCurrentComponent();
                    if (c != null) {
                        return c.getBackground();
                    } else {
                        return null;
                    }
                }
            }

            public void setBackground(Color c) {
                AccessibleContext ac = getCurrentAccessibleContext();
                if (ac instanceof AccessibleComponent) {
                    ((AccessibleComponent) ac).setBackground(c);
                } else {
                    Component cp = getCurrentComponent();
                    if (cp != null) {
                        cp.setBackground(c);
                    }
                }
            }

            public Color getForeground() {
                AccessibleContext ac = getCurrentAccessibleContext();
                if (ac instanceof AccessibleComponent) {
                    return ((AccessibleComponent) ac).getForeground();
                } else {
                    Component c = getCurrentComponent();
                    if (c != null) {
                        return c.getForeground();
                    } else {
                        return null;
                    }
                }
            }

            public void setForeground(Color c) {
                AccessibleContext ac = getCurrentAccessibleContext();
                if (ac instanceof AccessibleComponent) {
                    ((AccessibleComponent) ac).setForeground(c);
                } else {
                    Component cp = getCurrentComponent();
                    if (cp != null) {
                        cp.setForeground(c);
                    }
                }
            }

            public Cursor getCursor() {
                AccessibleContext ac = getCurrentAccessibleContext();
                if (ac instanceof AccessibleComponent) {
                    return ((AccessibleComponent) ac).getCursor();
                } else {
                    Component c = getCurrentComponent();
                    if (c != null) {
                        return c.getCursor();
                    } else {
                        Accessible ap = getAccessibleParent();
                        if (ap instanceof AccessibleComponent) {
                            return ((AccessibleComponent) ap).getCursor();
                        } else {
                            return null;
                        }
                    }
                }
            }

            public void setCursor(Cursor c) {
                AccessibleContext ac = getCurrentAccessibleContext();
                if (ac instanceof AccessibleComponent) {
                    ((AccessibleComponent) ac).setCursor(c);
                } else {
                    Component cp = getCurrentComponent();
                    if (cp != null) {
                        cp.setCursor(c);
                    }
                }
            }

            public Font getFont() {
                AccessibleContext ac = getCurrentAccessibleContext();
                if (ac instanceof AccessibleComponent) {
                    return ((AccessibleComponent) ac).getFont();
                } else {
                    Component c = getCurrentComponent();
                    if (c != null) {
                        return c.getFont();
                    } else {
                        return null;
                    }
                }
            }

            public void setFont(Font f) {
                AccessibleContext ac = getCurrentAccessibleContext();
                if (ac instanceof AccessibleComponent) {
                    ((AccessibleComponent) ac).setFont(f);
                } else {
                    Component c = getCurrentComponent();
                    if (c != null) {
                        c.setFont(f);
                    }
                }
            }

            public FontMetrics getFontMetrics(Font f) {
                AccessibleContext ac = getCurrentAccessibleContext();
                if (ac instanceof AccessibleComponent) {
                    return ((AccessibleComponent) ac).getFontMetrics(f);
                } else {
                    Component c = getCurrentComponent();
                    if (c != null) {
                        return c.getFontMetrics(f);
                    } else {
                        return null;
                    }
                }
            }

            public boolean isEnabled() {
                AccessibleContext ac = getCurrentAccessibleContext();
                if (ac instanceof AccessibleComponent) {
                    return ((AccessibleComponent) ac).isEnabled();
                } else {
                    Component c = getCurrentComponent();
                    if (c != null) {
                        return c.isEnabled();
                    } else {
                        return false;
                    }
                }
            }

            public void setEnabled(boolean b) {
                AccessibleContext ac = getCurrentAccessibleContext();
                if (ac instanceof AccessibleComponent) {
                    ((AccessibleComponent) ac).setEnabled(b);
                } else {
                    Component c = getCurrentComponent();
                    if (c != null) {
                        c.setEnabled(b);
                    }
                }
            }

            public boolean isVisible() {
                AccessibleContext ac = getCurrentAccessibleContext();
                if (ac instanceof AccessibleComponent) {
                    return ((AccessibleComponent) ac).isVisible();
                } else {
                    Component c = getCurrentComponent();
                    if (c != null) {
                        return c.isVisible();
                    } else {
                        return false;
                    }
                }
            }

            public void setVisible(boolean b) {
                AccessibleContext ac = getCurrentAccessibleContext();
                if (ac instanceof AccessibleComponent) {
                    ((AccessibleComponent) ac).setVisible(b);
                } else {
                    Component c = getCurrentComponent();
                    if (c != null) {
                        c.setVisible(b);
                    }
                }
            }

            public boolean isShowing() {
                if (isVisible() && JTableHeader.this.isShowing()) {
                    return true;
                } else {
                    return false;
                }
            }

            public boolean contains(Point p) {
                AccessibleContext ac = getCurrentAccessibleContext();
                if (ac instanceof AccessibleComponent) {
                    Rectangle r = ((AccessibleComponent) ac).getBounds();
                    return r.contains(p);
                } else {
                    Component c = getCurrentComponent();
                    if (c != null) {
                        Rectangle r = c.getBounds();
                        return r.contains(p);
                    } else {
                        return getBounds().contains(p);
                    }
                }
            }

            public Point getLocationOnScreen() {
                if (parent != null) {
                    Point parentLocation = parent.getLocationOnScreen();
                    Point componentLocation = getLocation();
                    componentLocation.translate(parentLocation.x, parentLocation.y);
                    return componentLocation;
                } else {
                    return null;
                }
            }

            public Point getLocation() {
                AccessibleContext ac = getCurrentAccessibleContext();
                if (ac instanceof AccessibleComponent) {
                    Rectangle r = ((AccessibleComponent) ac).getBounds();
                    return r.getLocation();
                } else {
                    Component c = getCurrentComponent();
                    if (c != null) {
                        Rectangle r = c.getBounds();
                        return r.getLocation();
                    } else {
                        return getBounds().getLocation();
                    }
                }
            }

            public void setLocation(Point p) {
//                if ((parent != null)  && (parent.contains(p))) {
//                    ensureIndexIsVisible(indexInParent);
//                }
            }

            public Rectangle getBounds() {
                  Rectangle r = table.getCellRect(-1, column, false);
                  r.y = 0;
                  return r;

//                AccessibleContext ac = getCurrentAccessibleContext();
//                if (ac instanceof AccessibleComponent) {
//                    return ((AccessibleComponent) ac).getBounds();
//                } else {
//                  Component c = getCurrentComponent();
//                  if (c != null) {
//                      return c.getBounds();
//                  } else {
//                      Rectangle r = table.getCellRect(-1, column, false);
//                      r.y = 0;
//                      return r;
//                  }
//              }
            }

            public void setBounds(Rectangle r) {
                AccessibleContext ac = getCurrentAccessibleContext();
                if (ac instanceof AccessibleComponent) {
                    ((AccessibleComponent) ac).setBounds(r);
                } else {
                    Component c = getCurrentComponent();
                    if (c != null) {
                        c.setBounds(r);
                    }
                }
            }

            public Dimension getSize() {
                return getBounds().getSize();
//                AccessibleContext ac = getCurrentAccessibleContext();
//                if (ac instanceof AccessibleComponent) {
//                    Rectangle r = ((AccessibleComponent) ac).getBounds();
//                    return r.getSize();
//                } else {
//                    Component c = getCurrentComponent();
//                    if (c != null) {
//                        Rectangle r = c.getBounds();
//                        return r.getSize();
//                    } else {
//                        return getBounds().getSize();
//                    }
//                }
            }

            public void setSize (Dimension d) {
                AccessibleContext ac = getCurrentAccessibleContext();
                if (ac instanceof AccessibleComponent) {
                    ((AccessibleComponent) ac).setSize(d);
                } else {
                    Component c = getCurrentComponent();
                    if (c != null) {
                        c.setSize(d);
                    }
                }
            }

            public Accessible getAccessibleAt(Point p) {
                AccessibleContext ac = getCurrentAccessibleContext();
                if (ac instanceof AccessibleComponent) {
                    return ((AccessibleComponent) ac).getAccessibleAt(p);
                } else {
                    return null;
                }
            }

            @SuppressWarnings("deprecation")
            public boolean isFocusTraversable() {
                AccessibleContext ac = getCurrentAccessibleContext();
                if (ac instanceof AccessibleComponent) {
                    return ((AccessibleComponent) ac).isFocusTraversable();
                } else {
                    Component c = getCurrentComponent();
                    if (c != null) {
                        return c.isFocusTraversable();
                    } else {
                        return false;
                    }
                }
            }

            public void requestFocus() {
                AccessibleContext ac = getCurrentAccessibleContext();
                if (ac instanceof AccessibleComponent) {
                    ((AccessibleComponent) ac).requestFocus();
                } else {
                    Component c = getCurrentComponent();
                    if (c != null) {
                        c.requestFocus();
                    }
                }
            }

            public void addFocusListener(FocusListener l) {
                AccessibleContext ac = getCurrentAccessibleContext();
                if (ac instanceof AccessibleComponent) {
                    ((AccessibleComponent) ac).addFocusListener(l);
                } else {
                    Component c = getCurrentComponent();
                    if (c != null) {
                        c.addFocusListener(l);
                    }
                }
            }

            public void removeFocusListener(FocusListener l) {
                AccessibleContext ac = getCurrentAccessibleContext();
                if (ac instanceof AccessibleComponent) {
                    ((AccessibleComponent) ac).removeFocusListener(l);
                } else {
                    Component c = getCurrentComponent();
                    if (c != null) {
                        c.removeFocusListener(l);
                    }
                }
            }

        } // inner class AccessibleJTableHeaderElement

    }  // inner class AccessibleJTableHeader

}  // End of Class JTableHeader