Source for org.jfree.chart.labels.CategoryItemLabelGenerator

   1: /* ===========================================================
   2:  * JFreeChart : a free chart 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/jfreechart/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:  * CategoryItemLabelGenerator.java
  29:  * -------------------------------
  30:  * (C) Copyright 2001-2005, by Object Refinery Limited.
  31:  *
  32:  * Original Author:  David Gilbert (for Object Refinery Limited);
  33:  * Contributor(s):   -;
  34:  *
  35:  * $Id: CategoryItemLabelGenerator.java,v 1.1.2.1 2005/10/25 20:49:02 mungady Exp $
  36:  *
  37:  * Changes
  38:  * -------
  39:  * 13-Dec-2001 : Version 1 (DG);
  40:  * 16-Jan-2002 : Completed Javadocs (DG);
  41:  * 26-Sep-2002 : Fixed errors reported by Checkstyle (DG);
  42:  * 24-Oct-2002 : Method now specifies category index (DG);
  43:  * 05-Nov-2002 : Replaced reference to CategoryDataset with TableDataset (DG);
  44:  * 21-Jan-2003 : TableDataset merged with CategoryDataset (DG);
  45:  * 10-Apr-2003 : Changed CategoryDataset --> KeyedValues2DDataset (DG);
  46:  * 01-May-2003 : Added generateValueLabel() method (with a plan to renaming 
  47:  *               this interface to reflect its more general use) (DG);
  48:  * 09-Jun-2003 : Renamed CategoryToolTipGenerator 
  49:  *               --> CategoryItemLabelGenerator (DG);
  50:  * 13-Aug-2003 : Added clone() method (DG);
  51:  * 12-Feb-2004 : Removed clone() method (DG);
  52:  * 15-Apr-2004 : Moved generateToolTip() method into CategoryToolTipGenerator 
  53:  *               interface (DG);
  54:  * 11-May-2004 : Renamed CategoryItemLabelGenerator 
  55:  *               --> CategoryLabelGenerator (DG);
  56:  * 31-Jan-2005 : Added generateRowLabel() and generateColumnLabel()  
  57:  *               methods (DG);
  58:  * 20-Apr-2005 : Reverted name change of 11-May-2004 (DG);
  59:  * 
  60:  */
  61: 
  62: package org.jfree.chart.labels;
  63: 
  64: import org.jfree.data.category.CategoryDataset;
  65: 
  66: /**
  67:  * A <i>category item label generator</i> is an object that can be assigned to a
  68:  * {@link org.jfree.chart.renderer.category.CategoryItemRenderer} and that 
  69:  * assumes responsibility for creating text items to be used as labels for the 
  70:  * items in a {@link org.jfree.chart.plot.CategoryPlot}. 
  71:  * <p>
  72:  * To assist with cloning charts, classes that implement this interface should 
  73:  * also implement the {@link org.jfree.util.PublicCloneable} interface.
  74:  */
  75: public interface CategoryItemLabelGenerator {
  76: 
  77:     /**
  78:      * Generates a label for the specified row.
  79:      * 
  80:      * @param dataset  the dataset (<code>null</code> not permitted).
  81:      * @param row  the row index (zero-based).
  82:      * 
  83:      * @return The label.
  84:      */
  85:     public String generateRowLabel(CategoryDataset dataset, int row);
  86:     
  87:     /**
  88:      * Generates a label for the specified row.
  89:      * 
  90:      * @param dataset  the dataset (<code>null</code> not permitted).
  91:      * @param column  the column index (zero-based).
  92:      * 
  93:      * @return The label.
  94:      */
  95:     public String generateColumnLabel(CategoryDataset dataset, int column);
  96:     
  97:     /**
  98:      * Generates a label for the specified item. The label is typically a 
  99:      * formatted version of the data value, but any text can be used.
 100:      *
 101:      * @param dataset  the dataset (<code>null</code> not permitted).
 102:      * @param row  the row index (zero-based).
 103:      * @param column  the column index (zero-based).
 104:      *
 105:      * @return The label (possibly <code>null</code>).
 106:      */
 107:     public String generateLabel(CategoryDataset dataset, int row, int column);
 108:     
 109: }