Source for org.jfree.ui.NumberCellRenderer

   1: /* ========================================================================
   2:  * JCommon : a free general purpose class library for the Java(tm) platform
   3:  * ========================================================================
   4:  *
   5:  * (C) Copyright 2000-2005, by Object Refinery Limited and Contributors.
   6:  * 
   7:  * Project Info:  http://www.jfree.org/jcommon/index.html
   8:  *
   9:  * This library is free software; you can redistribute it and/or modify it 
  10:  * under the terms of the GNU Lesser General Public License as published by 
  11:  * the Free Software Foundation; either version 2.1 of the License, or 
  12:  * (at your option) any later version.
  13:  *
  14:  * This library is distributed in the hope that it will be useful, but 
  15:  * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY 
  16:  * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public 
  17:  * License for more details.
  18:  *
  19:  * You should have received a copy of the GNU Lesser General Public
  20:  * License along with this library; if not, write to the Free Software
  21:  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, 
  22:  * USA.  
  23:  *
  24:  * [Java is a trademark or registered trademark of Sun Microsystems, Inc. 
  25:  * in the United States and other countries.]
  26:  * 
  27:  * -----------------------
  28:  * NumberCellRenderer.java
  29:  * -----------------------
  30:  * (C) Copyright 2000-2004, by Object Refinery Limited.
  31:  *
  32:  * Original Author:  David Gilbert (for Object Refinery Limited);
  33:  * Contributor(s):   -;
  34:  *
  35:  * $Id: NumberCellRenderer.java,v 1.6 2006/04/30 09:07:20 taqua Exp $
  36:  *
  37:  * Changes (from 26-Oct-2001)
  38:  * --------------------------
  39:  * 26-Oct-2001 : Changed package to com.jrefinery.ui.*;
  40:  * 11-Mar-2002 : Updated import statements (DG);
  41:  *
  42:  */
  43: 
  44: package org.jfree.ui;
  45: 
  46: import java.awt.Component;
  47: import java.text.NumberFormat;
  48: 
  49: import javax.swing.JTable;
  50: import javax.swing.SwingConstants;
  51: import javax.swing.table.DefaultTableCellRenderer;
  52: 
  53: /**
  54:  * A table cell renderer that formats numbers with right alignment in each cell.
  55:  *
  56:  * @author David Gilbert
  57:  */
  58: public class NumberCellRenderer extends DefaultTableCellRenderer {
  59: 
  60:     /**
  61:      * Default constructor - builds a renderer that right justifies the 
  62:      * contents of a table cell.
  63:      */
  64:     public NumberCellRenderer() {
  65:         super();
  66:         setHorizontalAlignment(SwingConstants.RIGHT);
  67:     }
  68: 
  69:     /**
  70:      * Returns itself as the renderer. Supports the TableCellRenderer interface.
  71:      *
  72:      * @param table  the table.
  73:      * @param value  the data to be rendered.
  74:      * @param isSelected  a boolean that indicates whether or not the cell is 
  75:      *                    selected.
  76:      * @param hasFocus  a boolean that indicates whether or not the cell has 
  77:      *                  the focus.
  78:      * @param row  the (zero-based) row index.
  79:      * @param column  the (zero-based) column index.
  80:      *
  81:      * @return the component that can render the contents of the cell.
  82:      */
  83:     public Component getTableCellRendererComponent(final JTable table, 
  84:             final Object value, final boolean isSelected, 
  85:             final boolean hasFocus, final int row, final int column) {
  86: 
  87:         setFont(null);
  88:         final NumberFormat nf = NumberFormat.getNumberInstance();
  89:         if (value != null) {
  90:           setText(nf.format(value));
  91:         }
  92:         else {
  93:           setText("");
  94:         }
  95:         if (isSelected) {
  96:             setBackground(table.getSelectionBackground());
  97:         }
  98:         else {
  99:             setBackground(null);
 100:         }
 101:         return this;
 102:     }
 103: 
 104: }